UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Form 8-K

Current Report

Pursuant to Section 13 of 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 22, 2005

Chevron Corporation

Registrant’s telephone number, including area code: (925) 842-1000

NONE

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligations of the registrant under any of the following provisions:

þ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

 

Item 8.01 Other Events

     On July 19, 2005, Chevron Corporation and Unocal Corporation entered into an amendment to the agreement and plan of merger by and among Unocal Corporation, Chevron Corporation and Blue Merger Sub Inc. dated April 4, 2005 (the “amended merger agreement”).

     This current report on Form 8-K includes (1) a Supplement dated July 22, 2005 to the Proxy Statement/Prospectus dated June 29, 2005 relating to the amended merger agreement and (2) the consent of Morgan Stanley & Co. Incorporated dated July 22, 2005, each of which is filed as an exhibit hereto and incorporated herein by reference.

Additional Information for Investors

     Chevron has filed a Form S-4, Unocal has filed a proxy statement and both companies have filed and will file other relevant documents concerning the proposed merger transaction with Chevron with the Securities and Exchange Commission (SEC). INVESTORS ARE URGED TO READ THE FORM S-4, PROXY STATEMENT AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC BECAUSE THEY CONTAIN IMPORTANT INFORMATION. You may obtain the documents free of charge at the Web site maintained by the SEC at www.sec.gov. In addition, you may obtain documents filed with the SEC by Chevron free of charge by contacting Chevron Comptroller’s Department, 6001 Bollinger Canyon Road – A3201, San Ramon, CA 94583-2324. You may obtain documents filed with the SEC by Unocal free of charge by contacting Unocal Stockholder Services at 800-252-2233, 2141 Rosecrans Avenue, Suite 4000, El Segundo, CA 90245.

Interest of Certain Persons in the Merger

     Chevron, Unocal, and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from Unocal’s stockholders in connection with the proposed Chevron merger. Information about the directors and executive officers of Chevron and their ownership of Chevron stock is set forth in the proxy statement for Chevron’s 2005 Annual Meeting of Stockholders. Information about the directors and executive officers of Unocal and their ownership of Unocal stock is set forth in the proxy statement for Unocal’s 2005 Annual Meeting of Stockholders. Investors may obtain additional information regarding the interests of such participants by reading the Form S-4 and proxy statement for the merger. Investors should read the Form S-4 and proxy statement carefully before making any voting or investment decisions.

Item 9.01 Financial Statements and Exhibits

(c)     Exhibits

Number Exhibit

20.1          Supplement dated July 22, 2005 to the Proxy Statement/Prospectus dated June 29, 2005 relating to the Proposed Merger of Unocal Corporation with Chevron Corporation

23.1          Consent of Morgan Stanley & Co. Incorporated dated July 22, 2005

 

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	CHEVRON CORPORATION
Dated: July 25, 2005	By /s/ M.A. Humphrey
	M.A. Humphrey, Vice President and
	Comptroller (Principal Accounting Officer and Duly Authorized Officer)

 

EXHIBIT INDEX

Number Exhibit

20.1

Supplement dated July 22, 2005 to the Proxy Statement/Prospectus dated June 29, 2005 relating to the Proposed Merger of Unocal Corporation with Chevron Corporation

23.1

Consent of Morgan Stanley & Co. Incorporated dated July 22, 2005

 

Supplement to Proxy Statement/ Prospectus

Amendment to Agreement and Plan of Merger with Chevron Corporation — Your Vote is Very Important

July 22, 2005

To Unocal Corporation Stockholders:

     On or about July 1, 2005, we mailed to you a proxy statement/ prospectus relating to a special meeting of stockholders of Unocal Corporation scheduled for August 10, 2005 to consider a proposal to approve and adopt the Agreement and Plan of Merger (the “Merger Agreement”) dated as of April 4, 2005, by and among Unocal, Chevron Corporation and Blue Merger Sub Inc., a wholly owned subsidiary of Chevron.

     On July 19, 2005, Unocal, Chevron and Blue Merger Sub entered into an amendment to the Merger Agreement. This amendment has the effect of increasing the merger consideration paid to Unocal stockholders for their shares. Pursuant to the amended merger agreement, each Unocal stockholder would have the right to elect to receive, for each Unocal share:

     The all-stock and all-cash elections above are subject to proration to preserve an overall per share mix of 0.618 of a share of Chevron common stock and $27.60 in cash for all of the outstanding shares of Unocal common stock taken together.

     Based on the closing price of Chevron’s common stock on the New York Stock Exchange on July 21, 2005, the value of the per share consideration to be received by Unocal stockholders who elect to receive only Chevron common stock would be $58.68 (assuming no proration), and the value of the mixed election consideration would be approximately $62.81 per share.

     The implied value of the stock consideration will fluctuate as the market price of the Chevron common stock fluctuates, and, because your election is subject to proration as described above, you may receive some Chevron common stock, rather than cash, even though you make an all-cash election (and vice versa). Unocal common stock trades on the New York Stock Exchange under the ticker symbol “UCL.” Chevron common stock trades on the New York Stock Exchange under the ticker symbol “CVX.” We urge you to obtain current market quotations of Chevron and Unocal common stock. Upon completion of the merger, we estimate that Unocal’s former stockholders will own approximately 7.5% of the common stock of Chevron.

     Completion of the merger requires the approval of Unocal stockholders. Unocal’s board of directors unanimously recommends that stockholders vote FOR adoption of the amended merger agreement and any adjournment of the special meeting. The time, date and place of the Unocal special meeting of stockholders has not changed. The meeting will still be held on August 10, 2005, at 10:00 a.m., Pacific Daylight Time, at The Hilton Los Angeles Airport Hotel, 5711 West Century Blvd., Los Angeles, California 90045. The record date for the special meeting has not changed. Only stockholders who held shares of Unocal common stock at the close of business on June 29, 2005 are entitled to vote at the special meeting. Attached to this letter is a supplement to the proxy statement/ prospectus containing additional information about Chevron, Unocal and the amended merger agreement. We urge you to read this document carefully and in its entirety. We also encourage you, if you have not done so already, to review the proxy statement/ prospectus dated June 29, 2005. In particular, see “Risk Factors” beginning on page 19 of the June 29 proxy statement/ prospectus.

     We have enclosed a proxy card with this proxy supplement. If you have already delivered a properly executed proxy, you do not need to do anything unless you wish to change your vote. If you have not previously voted or if you wish to revoke or change your vote, please complete, date, sign and return the enclosed proxy card or vote by telephone or over the Internet.

     Whether or not you plan to attend the special meeting, please vote as soon as possible so that your shares are represented at the meeting. If you do not vote, it will have the same effect as voting against the merger.

     Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the securities to be issued in connection with the merger or determined if this document is accurate or complete. Any representation to the contrary is a criminal offense.

     This supplement is dated July 22, 2005 and is first being mailed to Unocal stockholders on or about July 25, 2005.

CAUTIONARY STATEMENT CONCERNING

FORWARD-LOOKING STATEMENTS

      This supplement and the SEC filings that are incorporated by reference into this supplement contain or incorporate by reference forward-looking statements that have been made pursuant to the provisions of, and in reliance on the safe harbor under, the Private Securities Litigation Reform Act of 1995. These forward-looking statements are not historical facts, but rather are based on current expectations, estimates and projections. Words such as “anticipates,” “expects,” “intends,” “plans,” “believes,” “seeks,” “could,” “should,” “will,” “projects,” “estimates” and similar expressions are intended to identify forward-looking statements. These statements are not guarantees of future performance and are subject to risks, uncertainties and other factors, some of which are beyond our control, are difficult to predict and could cause actual results to differ materially from those expressed or forecasted in the forward-looking statements. In that event, Unocal’s or Chevron’s business, financial condition or results of operations could be materially adversely affected, and investors in Unocal’s or Chevron’s securities could lose part or all of their investment. You should not place undue reliance on these forward-looking statements, which speak only as of the date of this supplement or, in the case of documents incorporated by reference, the date referenced in those documents. We are not obligated to update these statements or publicly release the result of any revision to them to reflect events or circumstances after the date of this supplement or, in the case of documents incorporated by reference, the date referenced in those documents, or to reflect the occurrence of unanticipated events.

      You should understand that the following important factors, in addition to those discussed elsewhere in this document and in the documents which are incorporated by reference, could affect the future results of Chevron and Unocal, and of the combined company after the merger, and could cause those results or other outcomes to differ materially from those expressed in our forward-looking statements:

TABLE OF CONTENTS

QUESTIONS AND ANSWERS ABOUT THE MERGER,

THE AMENDMENT TO THE MERGER AGREEMENT AND

THE SPECIAL STOCKHOLDER MEETING

      The following questions and answers briefly address some commonly asked questions about the merger, the amendment to the merger agreement dated July 19, 2005 and Unocal’s special meeting of stockholders. They may not include all of the information that is important to you. We urge you to read carefully this entire supplement, including the annexes, the June 29 proxy statement/ prospectus and the other documents we refer to in this supplement and in the June 29 proxy statement/ prospectus.

About the Merger

About the Amended Merger Agreement

About the Special Stockholders Meeting

No vote of the stockholders of Chevron is required to complete the merger.

About Election Forms

How to Get More Information

MacKenzie Partners, Inc.

105 Madison Avenue

New York, NY 10016

(800) 322-2885

Mellon Investor Services

85 Challenger Road

Ridgefield Park, NJ 07660

(866) 865-6324

SUMMARY OF AMENDMENT TO THE MERGER AGREEMENT

      On July 19, 2005, Unocal and Chevron entered into Amendment No. 1 to the Agreement and Plan of Merger, dated April 4, 2005, by and among Unocal, Chevron and Blue Merger Sub Inc., a wholly owned subsidiary of Chevron. The June 29 proxy statement/ prospectus includes the original merger agreement as an annex and also includes a summary of the merger agreement, beginning on page 55 of that proxy statement/ prospectus.

      The amendment to the merger agreement is included as Annex A to this supplement and is incorporated by reference into this discussion. The following discussion summarizes the material changes that the amendment to the merger agreement made to the original merger agreement and the material effects of these changes.

Increase in Merger Consideration

      The amendment to the merger agreement provides for an increase in the merger consideration to be received by Unocal stockholders in the merger. Under the merger agreement, as amended, you will have the right to elect to receive, for each Unocal share that you own:

      Unocal stockholders may elect to receive one of these three categories of consideration. Unless you make an all-cash or an all-stock election, you will receive the mixed consideration in the merger. In addition, the all-cash and all-stock elections are subject to proration in order to preserve an overall per share mix of 0.618 of a share of Chevron common stock and $27.60 in cash for all of the outstanding shares of Unocal common stock taken together, providing a blended value of approximately $63.01 per share of Unocal common stock based on the closing price of Chevron common stock on the day that Unocal and Chevron entered into the amendment to the merger agreement. In the aggregate, Chevron will issue approximately 168 million shares of Chevron common stock and pay approximately $7.5 billion in cash in the merger.

Proration of the Stock and Cash Elections

      The following discussion updates the discussion in the section entitled “The Merger Agreement — Merger Consideration — Explanation of the Proration of the Stock and Cash Elections” beginning on page 56 of the June 29 proxy statement/ prospectus, in light of the amendment to the merger agreement.

      The total amount of cash that will be paid to holders of Unocal common stock in the merger will be equal to $27.60 multiplied by the total number of shares of Unocal common stock outstanding immediately prior to completion of the merger (less any dissenting shares and any shares held by Unocal or Chevron). The overall amount of Chevron common stock that will be issued in the merger to holders of Unocal common stock will be equal to the product of (x) the total number of shares of Unocal common stock outstanding immediately prior to completion of the merger (less any dissenting shares and any shares held by Unocal or Chevron) multiplied by (y) 0.618. All-stock and all-cash elections are subject to proration to preserve an overall per share mix of 0.618 of a share of Chevron common stock and $27.60 in cash for all of the outstanding shares of Unocal common stock taken together. Therefore, unless the number of all-stock elections is significantly greater than the number of all-cash elections, Unocal stockholders making the all-cash election will not receive $69.00 in cash for each share of Unocal common stock, but instead will receive a mix of stock and cash calculated to preserve the overall mix of stock and cash described above, after taking into account all of the elections made by all of the Unocal stockholders. In all cases, Unocal stockholders who make the all-cash election will receive at least as much cash as is received by stockholders electing the mixed merger consideration. Similarly, if too few stockholders elect the all-cash consideration, Unocal stockholders making the all-stock election will not receive 1.03 shares of Chevron common stock for each share of Unocal common stock, but instead will receive a mix of stock and cash calculated to preserve the overall stock and cash mix described above, after taking into account

all of the elections made by all of the Unocal stockholders. In all cases, Unocal stockholders who make the all-stock election will receive at least as much stock as is received by stockholders electing the mixed merger consideration. Unocal stockholders who elect the mixed merger consideration will not be subject to proration.

      We illustrate below how the proration mechanism will be used. For ease of reference, we refer to the amount of cash derived by multiplying $27.60 by the total number of shares of Unocal common stock outstanding immediately prior to the completion of the merger (less any dissenting shares and any shares held by Unocal or Chevron) as the “aggregate cash amount.”

      Unless the number of all-stock elections is significantly greater than the number of all-cash elections, Unocal stockholders making the all-cash election will not receive $69.00 in cash for each share of Unocal common stock, but instead will receive a mix of stock and cash calculated in the following manner:

      If too few stockholders elect the all-cash consideration, Unocal stockholders making the all-stock election will not receive 1.03 shares of Chevron common stock for each share of Unocal common stock, but instead will receive a mix of stock and cash calculated in the following manner:

Dissenting Shares

      Under the amended merger agreement, any stockholder that has properly complied with the appraisal rights provisions contained in Section 262 of the Delaware General Corporation Law as of the election deadline but subsequently withdraws the demand for appraisal (or otherwise forfeits its appraisal rights) will receive the mixed merger consideration (or the all-stock consideration, if necessary to preserve the intended tax treatment of the merger). See “The Merger — Appraisal Rights” beginning on page 37 of the June 29 proxy statement/ prospectus for more information.

COMPARATIVE HISTORICAL AND PRO FORMA PER SHARE DATA

      Set forth below are the Chevron and Unocal historical and pro forma amounts per share of common stock for income from continuing operations, cash dividends and book value. The exchange ratio for the pro forma computations is 0.618 of a share of Chevron common stock for each share of Unocal common stock. The basic consideration for the transaction is 0.618 of a share of Chevron common stock and $27.60 in cash for each share of Unocal common stock outstanding immediately prior to completion of the merger.

      You should read the information below together with the historical financial statements and related notes contained in the Chevron and Unocal Annual Reports on Form 10-K for the year ended December 31, 2004, and other information filed with the SEC and incorporated by reference. See “Additional Information for Stockholders — Where You Can Find More Information” on page S-33 of this supplement.

      The unaudited pro forma combined data below is for illustrative purposes only. The pro forma adjustments for the balance sheet are based on the assumption that the transaction was consummated on March 31, 2005. The pro forma adjustments for the income statements are based on the assumption that the transaction was consummated on January 1, 2004.

      The financial results may have been different had the companies always been combined. You should not rely on this information as being indicative of the historical results that would have been achieved had the companies always been combined or of the future results of the combined company. See “Notes Concerning the Preliminary Estimate of the Deemed Purchase Price for Unocal” on the following page for a discussion of the pro forma financial data used in the comparative per-share amounts in the table below.

Notes Concerning the Preliminary Estimate of the Deemed Purchase Price for Unocal

      The preliminary estimate of the deemed purchase price for Unocal is $17.284 billion, composed of the following:

      This estimated purchase price does not represent a significant acquisition for Chevron under the significance tests of the SEC for business combinations. That is, each of the following tests computes to a measure less than 20 percent:

      The pro forma per-share data on the previous page were based on a preliminary allocation of the $17.284 billion purchase price to the estimated fair values of the Unocal assets and liabilities at March 31, 2005. An independent appraisal firm was engaged to provide estimates of the fair values of tangible and intangible assets. These and other preliminary estimates will change as additional information becomes available and is assessed by Chevron and the valuation firm.

      The $17.284 billion purchase price was allocated as follows:

      Chevron deems the $5.0 billion of goodwill to represent benefits of the acquisition that are additional to the fair values of the individual assets and liabilities acquired. Chevron believes the “going-concern” element of the Unocal businesses presents the opportunity to earn a higher rate of return on the assembled collection of net assets than would be expected if those assets were acquired separately. These benefits include growth opportunities in upstream Asia-Pacific, Gulf of Mexico and Caspian regions, some of which contain Unocal operations that are complementary to those of Chevron. Chevron also expects to achieve cost savings through the elimination of duplicate activities, high-grading of the asset portfolio and sharing of best practices in the operations of each company.

      Not included in the initial purchase price allocation was an expected liability for the combined company’s restructuring activities following the date of close, including severance costs associated with a workforce reduction for redundant operations. As plans for these restructuring activities become finalized, the associated liability will be among the final adjustments to the purchase price allocation.

      The effects of the purchase accounting estimates discussed above on the pro forma income from continuing operations and reflected in the per-share amounts on page S-11 of this supplement were not significant. The largest of the pro forma adjustments related to depreciation, depletion and amortization expense for the increase in properties to their fair values. These net pro forma adjustments were approximately 1% of the historical amounts for the combined Unocal and Chevron income from continuing operations for both the year ended December 31, 2004, and the three months ended March 31, 2005.

COMPARATIVE MARKET VALUE OF SECURITIES

      The following table sets forth the closing price per share of Chevron common stock and the closing price per share of Unocal common stock on April 1, 2005 (the last business day preceding the public announcement of the merger agreement), July 19, 2005 (the last business day preceding the public announcement of the amended merger agreement) and July 21, 2005 (the most recent practicable trading date). The table also presents the equivalent market value per share of Unocal common stock using the terms of the original merger agreement for April 1, 2005, and using the terms of the revised merger agreement for July 19 and July 21, 2005:

      You are urged to obtain current market quotations for shares of Chevron common stock and Unocal common stock before making a decision with respect to the merger.

      No assurance can be given as to the market prices of Chevron common stock or Unocal common stock at the closing of the merger. Because the exchange ratio will not be adjusted for changes in the market price of Chevron common stock, the market value of the shares of Chevron common stock that holders of Unocal common stock will receive at the effective time of the merger may vary significantly from the market value of the shares of Chevron common stock that holders of Unocal common stock would have received if the merger were consummated on the date of the merger agreement or on the date of this supplement.

HISTORICAL MARKET PRICE AND DIVIDEND DATA

      The following table sets forth the high and low intraday trading price per share of Chevron and Unocal common stock, as adjusted for all stock splits and as reported on the New York Stock Exchange, for the periods indicated:

RECENT DEVELOPMENTS

Regulatory Approvals

      On June 10, 2005, the U.S. Federal Trade Commission accepted for public comment a proposed agreement and consent order to resolve the only competitive issue identified by the FTC in its review of the proposed merger between Unocal and Chevron. Under the terms of the agreement, upon the consummation of the merger, Chevron and Unocal will take steps to cease enforcing Unocal’s patents for reformulated gasoline. Acceptance of the agreement terminated the HSR waiting period. The agreement was placed on the public record for a 30-day public comment period, which expired on July 9, 2005.

Sale of Northrock Resources

      On July 8, 2005, Unocal entered into an agreement with Pogo Producing Company to sell all of the outstanding capital stock in Unocal’s wholly owned Canadian subsidiary, Northrock Resources Ltd., to Pogo for $1.8 billion in cash. Unocal expects to realize after-tax proceeds from the sale of approximately $1.5 billion.

      Northrock represents essentially all of Unocal’s Canadian oil and gas reserves and production. Based on Unocal’s recent financial reports, Canada accounted for less than 7 percent of Unocal’s worldwide hydrocarbon reserves (year-end 2004) and production (quarter ended March 31, 2005). The Northrock transaction, which is subject to customary Canadian regulatory approvals, is expected to close in the third quarter of 2005.

Congressional Reaction to CNOOC Bid

      On July 1, the House of Representatives passed House Resolution 3058 appropriating funds for the U.S. Department of the Treasury for fiscal year 2006, which also prohibited the use of those funds to recommend approval of the sale of Unocal to CNOOC Limited.

      On July 13, Representative Pombo, Chairman of the House Committee on Resources, wrote to Representative Joe Barton, Chairman of the House Committee on Energy and Commerce, to propose an amendment to the Conference Report for the Energy Policy Act of 2005 that would require the Secretary of Energy to conduct a 180-day review of issues surrounding the energy policy of the People’s Republic of China prior to the commencement of the review by the Committee on Foreign Investments in the United States (CFIUS) of CNOOC’s proposed acquisition of Unocal.

      On July 20, Senator Charles Schumer of New York introduced an amendment to the Foreign Operations Appropriations bill (HR 3057), which passed the Senate by voice vote. The amendment would delay any U.S. governmental approval of any acquisition by a foreign government-owned entity of a U.S. company until 30 days after delivery of an assessment by the Secretary of State as to whether there are reciprocal laws allowing for similar transactions in that foreign country. Neither this amendment nor the House Resolution discussed above is subject to a corresponding provision in legislation passed by the other body of Congress and thus enactment of such provisions into law would require adoption by the other body of Congress, as to which there can be no assurance.

Stockholder Litigation

      The section entitled “Recent Developments” in the proxy statement/prospectus dated June 29, 2005 described purported class actions brought on behalf of public stockholders of Unocal and filed in the Superior Court for the State of California, County of Los Angeles. Plaintiff’s counsel has informed Unocal’s counsel that plaintiffs intend to make a motion for an injunction that would, among other things, result in a delay or postponement of the scheduled August 10, 2005 shareholder vote. The court has scheduled a hearing with respect to such a motion for August 5, 2005.

UPDATE TO BACKGROUND OF THE MERGER

      The June 29 proxy statement/ prospectus describes the background of the merger up to and including that date. The discussion below supplements that description.

      As disclosed in the June 29 proxy statement/ prospectus, on April 4, David O’Reilly, chairman of the board and chief executive officer of Chevron, and Charles R. Williamson, chairman of the board and chief executive officer of Unocal, signed a merger agreement and shortly thereafter Unocal and Chevron announced the transaction to the public through a joint press release issued before the opening of trading. The merger transaction provided for the conversion of outstanding Unocal shares into (i) 0.7725 of a share of Chevron common stock and $16.25 in cash per Unocal share, (ii) Chevron common stock at an exchange ratio of 1.03 Chevron shares per Unocal share or (iii) $65 in cash per Unocal share, with the all-stock and all-cash elections subject to proration to preserve an overall per share mix of 0.7725 of a share of Chevron common stock and $16.25 in cash for all of the outstanding shares of Unocal common stock taken together.

      On June 1, the chairman and chief executive officer of CNOOC Limited communicated by telephone to a senior executive of Unocal that CNOOC was continuing to consider an acquisition proposal for Unocal, and that CNOOC intended to present an offer to Unocal in the next few days. No further details were conveyed to Unocal with respect to the terms or timing of any potential offer. The Unocal executive did not respond to the CNOOC executive at that time, other than to affirm the existence of contractual limitations on Unocal’s ability to discuss such matters with CNOOC. The same day, Unocal notified Chevron of the conversation.

      On June 22, Mr. Fu Chengyu, chairman and chief executive officer of CNOOC, telephoned Mr. Williamson and told him that Unocal would be receiving a merger proposal from CNOOC to acquire all outstanding shares of Unocal for $67 per share in cash. Thereafter, CNOOC announced the merger proposal, and later that day provided documentation, which indicated that the acquisition would be financed through approximately $16 billion of debt and approximately $3 billion of available cash of CNOOC and Unocal.

      CNOOC attached to its written proposal commitment letters from three financing sources. The largest of these financing commitments was from the China National Offshore Oil Corporation (referred to as CNOOC Parent), which is wholly owned by the government of the People’s Republic of China and which, as of this date, owns approximately 70.6% of the issued share capital of CNOOC. CNOOC Parent agreed to finance up to $7 billion of the purchase price in the form of subordinated debt financing, $2.5 billion of which would be in the form of a 30-year interest-free loan and up to $4.5 billion of which would be in the form of a 30-year loan bearing interest at 3.5% per annum, although that interest would not be payable if CNOOC’s credit rating dropped below a certain threshold. Any interest not paid because of such a drop in CNOOC’s credit rating would not cumulate and would never be payable. This CNOOC Parent financing would not include events of default and the $2.5 billion interest-free loan would include no affirmative or negative covenants. CNOOC Parent could require CNOOC to prepay the principal amount of the $4.5 billion loan no earlier than the fifth anniversary of the funding date and in any event only if CNOOC’s credit rating after such prepayment would remain at or above BBB. The $2.5 billion interest-free loan would be prepayable at par out of the net cash proceeds of any equity offering by CNOOC, and CNOOC would be obligated to raise sufficient cash proceeds to repay such loan within two years after funding, with CNOOC Parent agreeing to purchase its proportionate share of such an offering under certain circumstances. Industrial and Commercial Bank of China, which is also wholly owned by the government of the People’s Republic of China, committed to lend $6 billion in the form of a 364-day bridge loan facility bearing interest at LIBOR plus 50 basis points. Goldman Sachs Credit Partners L.P. and JP Morgan Chase Bank, N.A. also committed to provide, in the aggregate, $3 billion in the form of a 364-day bridge loan facility bearing interest at LIBOR plus 37.5 basis points and otherwise on substantially the same terms as the Industrial and Commercial Bank of China financing. Each financing commitment was subject to several conditions, including the completion of definitive documentation.

      CNOOC also attached to its written proposal a draft merger agreement, which, according to CNOOC, reflected its view of the status of its negotiations with Unocal as of the morning of April 2,

when Mr. Fu informed Mr. Williamson that CNOOC was not prepared to present a proposal to the Company’s board. In its June 22 package, CNOOC also included a draft commitment by CNOOC Parent, in the form of a voting agreement, to vote in favor of a transaction with Unocal, in light of the fact that, under the rules of the Hong Kong Stock Exchange, CNOOC shareholder approval was a condition to CNOOC’s completion of the transaction.

      On that same day (but before receiving the additional documentation from CNOOC), the board of directors of Unocal met telephonically to discuss developments relating to the CNOOC proposal and the merger with Chevron. As a result of this meeting, Unocal announced that the board intended to evaluate the CNOOC proposal in a manner consistent with its fiduciary duties and Unocal’s obligations under the merger agreement with Chevron and that the recommendation of its board of directors in favor of the merger with Chevron remained in effect. Unocal’s advisors provided Chevron’s advisors with copies of the relevant documentation received from CNOOC that day, in accordance with Unocal’s obligations under the Chevron merger agreement, and discussed with Chevron’s advisors the possibility for Unocal to engage in discussions with CNOOC immediately regarding CNOOC’s proposal.

      On June 23, Chevron granted Unocal a waiver under the merger agreement enabling Unocal, at any time prior to the date of the Unocal stockholder vote on the merger with Chevron, to negotiate with CNOOC and its representatives without the need for Unocal’s board to make certain threshold determinations that otherwise would be required under the Chevron merger agreement. That same day, Unocal’s advisors contacted CNOOC’s advisors to commence negotiations relating to the CNOOC proposal. Unocal’s management and advisors also continued to evaluate the threshold issues that remained to be addressed in the March and April negotiations with CNOOC, including issues relating to enforceability of any agreement with CNOOC and to CNOOC’s likelihood of obtaining requisite regulatory approvals in the United States (including the approval of CFIUS) and Hong Kong (including any approvals required to be granted by the Hong Kong Stock Exchange).

      On June 27, Mr. Williamson contacted Mr. Fu by telephone to discuss the anticipated process and timing for renewed negotiations and information exchange. Mr. Williamson expressed to Mr. Fu the board’s intention to pursue the transaction that represented the greater stockholder value, based on the board’s assessment of the consideration offered and the certainty of consummation. Mr. Williamson informed Mr. Fu that Unocal’s board intended to act quickly to evaluate the CNOOC proposal, particularly in light of Unocal’s contractual obligation to hold a stockholder vote on the Chevron merger promptly after finalizing Chevron’s registration statement. Mr. Williamson also noted the need for the parties to work together to resolve quickly key threshold issues, including certainty of closing and enforceability of any agreement against CNOOC and CNOOC Parent.

      Also on June 27, Mr. O’Reilly sent to Mr. Williamson a memorandum detailing key issues raised by the CNOOC proposal that, in Chevron’s view, mitigated the price differential between the two proposals. Mr. O’Reilly requested that Mr. Williamson deliver the memorandum to the Unocal directors.

      On June 28-30, representatives of Unocal’s and CNOOC’s management, as well as their respective advisors, held face-to-face meetings to discuss key issues relating to the CNOOC proposal. At the initial June 28 meeting, Unocal’s management and advisors echoed Mr. Williamson’s statement to Mr. Fu on the previous day to the effect that Unocal’s objective was to obtain the greatest possible stockholder value considering all relevant factors. Unocal’s representatives also made clear to CNOOC that the purpose of the June 28 meeting was to gather information to assist the board in understanding the CNOOC proposal, including assessing any uncertainties relating to that proposal, and that, until progress could be made in understanding these issues, and clear guidance was obtained from Unocal’s board, neither Unocal nor its advisors was yet in a position to negotiate financial terms.

      On June 28, at the conclusion of the first day of meetings, the Unocal board held a telephonic meeting, at which Mr. Williamson, along with Unocal’s senior management and advisors, provided an update to the board of developments since the previous meeting and, in particular, of the discussions with CNOOC held earlier that day, and reviewed the points raised in the Chevron memorandum. At the conclusion of the board meeting, the board instructed Unocal’s senior management to continue negotiations with CNOOC, and specifically noted the need to address the major contractual risks relating

to the CNOOC proposal, including the enforceability of agreements with CNOOC, before discussing its economic terms. On June 29, Unocal management forwarded the Chevron memorandum to each director.

      Beginning on June 29, and continuing through the following two weeks, representatives of CNOOC conducted additional due diligence on Unocal. In this process, Unocal provided additional non-public information to CNOOC and its representatives. This information was subject to the existing confidentiality agreement between Unocal and CNOOC, and, to the extent not previously provided to Chevron, was provided to Chevron promptly after being made available to CNOOC, as required by the Chevron merger agreement.

      At the June 29-30 meetings, Unocal’s management expressed the need to address contractually certain fundamental matters that, based on Unocal’s prior evaluation of proposals from CNOOC and its evaluation of the most recent CNOOC proposal, would be of particular concern to Unocal’s board and consequently required resolution before discussing the economic terms of CNOOC’s proposal. These matters included questions as to the enforceability of the proposed agreements against CNOOC (a Hong Kong entity) and CNOOC Parent (a company organized under the laws of the People’s Republic of China and owned by that country’s government); matters relating to U.S. regulatory review, particularly CFIUS approval (including the anticipated timing and likelihood of obtaining regulatory clearances); commitments relating to divestitures of non-U.S. assets if necessary to obtain required consents for the transaction; the impact on the proposed transaction of any future changes in Chinese or Hong Kong law; and Unocal’s request that CNOOC assume responsibility for Unocal’s obligation to pay termination fees of up to $500 million to Chevron were Chevron to terminate the Chevron merger agreement for reasons attributable to the proposed CNOOC transaction or to the inability to obtain the approval of Unocal’s stockholders for the Chevron merger. As a result of these meetings, Unocal and CNOOC in principle agreed to the creation by CNOOC of an escrow of $2.5 billion to be held in the United States by a U.S. bank, which amount would be available to satisfy claims brought by Unocal resulting from CNOOC’s failure to close due to breach by CNOOC of the merger agreement; and the payment by CNOOC directly of any termination fees payable by Unocal to Chevron under the Chevron merger agreement.

      On June 29, Unocal’s legal advisors sent a draft merger agreement to CNOOC’s legal advisors, and the parties commenced negotiations relating to the documentation of CNOOC’s proposal and the items referred to in the previous paragraph. During the following weeks, the parties continued negotiations relating to the documents, with a view to substantially completing all documentation prior to the next Unocal board meeting, which had been scheduled for July 14. During this time, Unocal also continued to consult with outside advisors on matters relating to regulatory approvals in the United States and Hong Kong (including the requirements and potential timing of such approvals), the features of a satisfactory escrow arrangement and issues relating to enforceability. Also during this time, senior management of Unocal kept Chevron representatives apprised of developments of negotiations, as required under the terms of the Chevron merger agreement.

      On July 1, CNOOC filed a notice with CFIUS requesting initiation of CFIUS’s review process relating to a potential transaction between CNOOC and Unocal.

      On July 8, Mr. Williamson discussed with Mr. O’Reilly by telephone the status of Unocal’s negotiations with CNOOC. Mr. Williamson noted to Mr. O’Reilly that the discussions with CNOOC had advanced significantly during the previous weeks. On July 11, pursuant to Unocal’s obligations under the Chevron merger agreement, Unocal’s management provided to Chevron a summary of the material terms of the then-current draft merger agreement with CNOOC.

      On July 11-13, Unocal and its advisors continued discussions with Chevron and CNOOC and their respective advisors with a view to seeking improvements in the terms of each party’s proposed transaction prior to the July 14 Unocal board meeting. In connection with those discussions, Unocal’s advisors conveyed to CNOOC’s advisors their expectation that the Unocal board would be willing to accept the considerably greater degree of transaction risk associated with the CNOOC proposal, as compared with the Chevron transaction, if the board were presented with a CNOOC proposal at a price that could be viewed as sufficient to compensate Unocal’s stockholders for the additional risks. Also during this time, Messrs. Williamson and O’Reilly spoke on two occasions. In those conversations, Mr. Williamson informed Mr. O’Reilly that discussions with CNOOC had progressed significantly. Mr. Williamson also stated to

Mr. O’Reilly that he had spoken with several Unocal board members individually and informed Mr. O’Reilly that the directors with whom Mr. Williamson had spoken viewed the value differential between the Chevron transaction and the CNOOC bid, in light of the status of negotiations between Unocal and CNOOC during the prior weeks, as potentially too significant to warrant continued board support of a Chevron transaction. Mr. Williamson also expressed to Mr. O’Reilly his concern that, at its current value, the Chevron proposal might not be approved by Unocal’s stockholders. Mr. O’Reilly noted his desire to present fully his position to Unocal’s board and, in that connection, presented to Mr. Williamson a second memorandum from Chevron, which was prepared based on the summary that Unocal had provided to Chevron and which detailed Chevron’s position as to the uncertainties surrounding the CNOOC proposal and the superiority of the Chevron transaction. At that time, Mr. O’Reilly also offered to make himself available to Unocal board members to discuss the Chevron transaction. Messrs. Williamson and O’Reilly also discussed the process for communications between the parties subsequent to the July 14 board meeting, and Mr. Williamson told Mr. O’Reilly that, after receiving guidance from the board at the upcoming meeting, he would call both Mr. O’Reilly and Mr. Fu to discuss next steps.

      On July 13, it was reported that CFIUS would not commence its review of the CNOOC transaction unless and until Unocal and CNOOC were to reach a definitive agreement. On that same day, the House of Representatives held hearings to address whether there were national security concerns raised by the proposed transaction.

      On July 14, the Unocal board met and was briefed on the status of negotiations with CNOOC and recent discussions with Chevron. The board also discussed with its outside legal and financial advisors the principal material risks, including risks relating to regulatory timing and certainty of closing, associated with the CNOOC proposal on the terms that had been negotiated. After discussing the material terms of the contractual arrangements relating to the CNOOC proposal, as well as the matters raised in the memorandum that Mr. O’Reilly had delivered to Mr. Williamson (a copy of which had been distributed to directors prior to the meeting), the board authorized Mr. Williamson to contact Messrs. Fu and O’Reilly to seek an improved proposal from each so that the board would be in a position to fully evaluate the CNOOC proposal (including whether to change or withdraw its recommendation of the Chevron transaction) at a telephonic meeting on July 17. The consensus of the board at that meeting was that, in light of the current value differential between the Chevron merger agreement and the CNOOC proposal and assuming that neither Chevron nor CNOOC improved the financial terms of its proposed transaction, the board’s inclination would be to withdraw its recommendation of the Chevron transaction. The board also expressed the view that, in light of the CNOOC proposal and assuming no improvement in the financial terms of the Chevron merger, it was unlikely that Unocal’s stockholders would approve the Chevron merger at the special meeting of stockholders. After the board meeting, Mr. Williamson called Mr. Fu to advise him of the outcome of the board meeting, including the board’s views concerning the risks attendant to a potential CNOOC transaction and his expectation that the Unocal board would be willing to accept those risks if CNOOC were to offer a price sufficient, in the board’s view, to compensate Unocal’s stockholders for the additional risk. Mr. Williamson thus emphasized to Mr. Fu that CNOOC should offer a higher per share transaction price. Mr. Fu informed Mr. Williamson that he would consider the matters discussed, and that he would call Mr. Williamson on July 16.

      On July 15, Mr. Williamson called Mr. O’Reilly and advised him of the board’s discussions and of the likelihood that, unless Chevron improved the financial terms of its merger, the board would be inclined to change its recommendation and deliver a notice to Chevron to that effect, pursuant to the terms of the Chevron merger agreement. After Messrs. Williamson and O’Reilly spoke, members of Unocal’s and Chevron’s senior management, and their respective advisors, discussed the status of Unocal’s negotiations with CNOOC and agreed that Mr. Williamson would contact Mr. O’Reilly before Unocal intended to deliver any formal notice of an intended change of recommendation. On that day, in accordance with Unocal’s obligations under the Chevron merger agreement, Unocal’s legal advisors sent to Chevron’s advisors the then-current draft of the merger agreement with CNOOC, and in the following days provided to Chevron’s advisors copies of agreements relating to the escrow and voting arrangements with CNOOC Parent.

      Also on July 15, CNOOC’s advisors informed Unocal that CNOOC had transferred to its accounts in the United States $2.5 billion of the funds that would be escrowed pursuant to the contractual arrangements that Unocal and CNOOC had negotiated, and that such funds were available to be deposited in escrow. CNOOC’s advisors informed Unocal that the remaining $500 million would be available to be deposited into escrow by July 18. That same day, Mr. Williamson contacted Mr. Fu and again requested that CNOOC increase its price. Mr. Williamson also observed to Mr. Fu that a sufficiently large increase in the proposed consideration could likely result in a conclusion of the process, and he urged Mr. Fu to make his best offer.

      On July 16, Mr. Fu called Mr. Williamson and informed him that, although CNOOC’s board had authorized an increase in the CNOOC proposal to $69 per share in cash, CNOOC was not prepared to raise the proposed per share consideration beyond $67 per share. Mr. Fu discussed with Mr. Williamson the possibility of raising the proposed price to $69 but noted that, in such event, CNOOC would require Unocal to pay the termination fees due to Chevron under the Chevron merger agreement and in addition would require specific actions to be taken by Unocal in support of a CNOOC transaction, prior to the termination of the Chevron merger agreement, including with respect to efforts to influence the U.S. Congress. Mr. Williamson noted to Mr. Fu that Unocal’s contractual obligations pursuant to the Chevron merger agreement would prevent such actions by Unocal, and he expressed dissatisfaction that Mr. Fu sought to reopen negotiations with respect to the previously-agreed treatment of the Chevron termination fee.

      On July 17, the board met telephonically and was briefed by Mr. Williamson on his conversations with both Messrs. O’Reilly and Fu. Unocal’s senior management and advisors also updated the board on the status of the agreements with CNOOC. After discussion, the board authorized Mr. Williamson to speak with Mr. O’Reilly to notify him of the status of the CNOOC discussions and the likelihood that, absent an improvement in the terms of the Chevron merger, the board would be inclined to change its recommendation, and to ask Mr. O’Reilly to present any revised proposal that Chevron wished to make by midday, Pacific time, on July 19, the date set for the next Unocal board meeting. Following the board meeting, Mr. Williamson called Mr. O’Reilly and conveyed that information and request.

      Messrs. Williamson and O’Reilly spoke on July 18, at which time Mr. O’Reilly updated Mr. Williamson on his discussions with members of Chevron’s board.

      By July 17, Unocal’s and CNOOC’s advisors had substantially completed negotiation of the key documentation relating to the potential CNOOC transaction. The principal draft agreements that resulted from these negotiations — a merger agreement, an escrow agreement for the $2.5 billion escrow and a voting agreement that would be executed by CNOOC Parent — are attached to this supplement as Annexes C, D and E, respectively.

      On July 19, Mr. O’Reilly called Mr. Williamson and delivered a revised proposal. The consideration proposed consisted of an all-cash election at $69 per Unocal share, an all-stock election at 1.03 shares of Chevron common stock per Unocal share (with this election and the all-cash election subject to proration) and a mixed election of $27.60 in cash and 0.618 of a share of Chevron common stock per Unocal share. Mr. O’Reilly noted that this proposal had been fully authorized by the Chevron board and had been designed to be, and, in his judgment, was, superior to a CNOOC bid of $69 per share, assuming CNOOC were to raise its bid to that level, as public reports intimated. Mr. O’Reilly also noted that this proposal was subject to a confidentiality obligation, and specifically, that it was conditioned upon Unocal’s execution of an amendment to the Chevron merger agreement reflecting the revised proposal and the issuance of a press release before the opening of trading the following morning, reaffirming Unocal’s recommendation of the transaction with Chevron. Mr. O’Reilly noted that Chevron’s proposal was also conditioned on a commitment by Unocal not to contact, or disclose the terms of the proposed amendment to, CNOOC prior to such announcement.

      That evening, the Unocal board met and considered the amendment to the Chevron merger agreement. After a discussion, including reports from senior management and advisors, the board approved the amendment to the merger agreement with Chevron. The board was informed that, at the close of business on July 19, based on the trading price of Chevron shares on the New York Stock Exchange, the

amended Chevron transaction had a blended value of approximately $63.01 per Unocal share, and that all other material terms of the Chevron merger agreement would continue in force following approval by the board, including Unocal’s ability to continue to engage in negotiations with CNOOC. Unocal’s board unanimously authorized management to negotiate and execute an amendment to the merger agreement on the terms discussed. The amendment to the merger agreement was executed as of July 19, and the transaction was announced to the public through a joint press release issued that evening.

UNOCAL’S REASONS FOR THE MERGER; RECOMMENDATION OF UNOCAL’S

BOARD OF DIRECTORS

      The Unocal board of directors, at a special meeting held on July 19, 2005, determined that the Chevron merger and the merger agreement, as amended, are advisable, fair to and in the best interests of Unocal and its stockholders and approved the amendment to the Chevron merger agreement. Accordingly, the Unocal board unanimously recommends that you vote FOR approval and adoption of the merger and the merger agreement, as amended, at the special meeting and any adjournment of the special meeting.

      In reaching its decision to reaffirm its recommendation that Unocal stockholders vote to approve the Chevron merger agreement, the board re-examined and reconsidered the matters described in “The Merger — Unocal’s Reasons for the Merger; Recommendation of Unocal’s Board of Directors” beginning on page 31 of the June 29 proxy statement/ prospectus. In addition, the board considered the following material factors in the course of its meetings since CNOOC made its June 22, 2005 proposal:

      The Unocal board of directors also considered, in the course of its meetings over the month since CNOOC made its proposal, potential risks associated with the Chevron merger, including the risks considered at its April 3 meeting and discussed in the June 29 proxy statement/ prospectus, as well as the following risks:

      In view of the variety of factors and the quality and amount of information considered as well as the complexity of these matters, the board did not find it practicable to, and did not attempt to, make specific assessments of, quantify, rank or otherwise assign relative weights to the specific factors considered in reaching its determination. The Unocal board conducted an overall analysis of the factors described above and in the June 29 proxy statement/ prospectus, including thorough discussion with, and questioning of, Unocal management and Unocal’s advisors, and generally considered the factors overall to be favorable to, and to support, its determination.

CHEVRON’S REASONS FOR THE MERGER

      Chevron’s board of directors believes that a merger with Unocal, as amended, represents good value for Chevron’s stockholders. Specifically, the merger provides Chevron the opportunity:

OPINION OF UNOCAL’S FINANCIAL ADVISOR

      Unocal retained Morgan Stanley to act as its financial advisor and to provide a fairness opinion to the board of directors of Unocal in connection with the merger. At the meetings of the board of directors on April 2 and April 3, 2005, Morgan Stanley rendered its oral opinion, which was subsequently confirmed in writing as of April 4, 2005, that based upon and subject to the assumptions, qualifications and limitations set forth in the opinion, the consideration that was to be received by the holders of shares of Unocal common stock pursuant to the original merger agreement was fair from a financial point of view to such holders. On July 21, 2005, at the request of Unocal, Morgan Stanley provided an updated opinion to the board of directors of Unocal in writing that, as of July 21, 2005, based upon and subject to the assumptions, qualifications and limitations set forth in the opinion, the consideration to be received by the holders of shares of Unocal common stock pursuant to the amended merger agreement was fair from a financial point of view to such holders.

      The full text of Morgan Stanley’s opinion, dated July 21, 2005, which sets forth, among other things, the assumptions made, procedures followed, matters considered and qualifications and limitations of the reviews undertaken in rendering its opinion is attached as Annex B to this proxy statement. The summary of Morgan Stanley’s fairness opinion set forth in this supplement proxy statement/ prospectus is qualified in its entirety by reference to the full text of the opinion. Stockholders should read this opinion carefully and in its entirety. Morgan Stanley’s opinion is directed to the board of directors of

Unocal, addresses only the fairness from a financial point of view of the consideration to be received by holders of Unocal common stock pursuant to the amended merger agreement, and does not address any other aspect of the merger. Morgan Stanley’s opinion does not constitute a recommendation to any stockholders of Unocal as to how such stockholders should vote with respect to the proposed transaction or what election they should make with respect to the consideration offered.

      In connection with rendering its opinion, Morgan Stanley, among other things:

      In arriving at its opinion, Morgan Stanley assumed and relied upon without independent verification the accuracy and completeness of the information supplied or otherwise made available to Morgan Stanley by Unocal and Chevron for the purposes of its opinion. With respect to the financial projections and other financial and operating data, Morgan Stanley assumed that they were reasonably prepared on bases reflecting the best currently available estimates and judgments of the future financial performance of Unocal and Chevron. Morgan Stanley relied, without independent verification, on the assessment by the

management of Unocal of the strategic rationale of the merger, including information related to certain strategic, financial and operational benefits anticipated from the merger. In addition, Morgan Stanley assumed that the merger will be consummated in accordance with the terms set forth in the amended merger agreement without material modification, waiver or delay, including, among other things, that the merger will be treated as a tax-free reorganization, pursuant to the Internal Revenue Code of 1986, as amended. Morgan Stanley assumed that in connection with the receipt of all the necessary regulatory approvals for the proposed merger, no restrictions will be imposed that would have a material adverse effect on the contemplated benefits expected to be derived in the proposed merger. Morgan Stanley did not make any independent valuation or appraisal of the assets or liabilities of Unocal or Chevron. With respect to the reserve estimates and reports referred to above, Morgan Stanley is not an expert in the engineering evaluation of oil and gas properties and, with the Unocal board’s consent, it relied, without independent verification, solely upon the internal reserve estimates of Unocal. In addition, Morgan Stanley is not a legal, regulatory or tax expert and it relied, without independent verification, on the assessment of Unocal and Chevron and their advisors with respect to such matters. Morgan Stanley’s opinion was necessarily based on financial, economic, market and other conditions as in effect on, and the information made available to it as of July 21, 2005.

      Morgan Stanley understood that CNOOC Limited had proposed to acquire Unocal for $67 per share of Unocal common stock in cash (the “CNOOC Proposal”) and that Unocal had engaged in discussions with CNOOC Limited regarding the CNOOC Proposal. Morgan Stanley was not asked to express, and Morgan Stanley did not express, any opinion as to the CNOOC Proposal or any transaction other than the merger proposed pursuant to the amended merger agreement, nor was Morgan Stanley asked to express, and Morgan Stanley did not express, any opinion as to the relative merits of or consideration offered in the proposed merger as compared to the CNOOC Proposal. Morgan Stanley’s opinion does not address the underlying business decision to enter the merger.

      The following is a summary of the material financial analyses performed by Morgan Stanley in connection with its opinion dated July 21, 2005. In connection with arriving at its opinion, Morgan Stanley considered all of its analyses as a whole and did not attribute any particular weight to any analysis described below. Some of these summaries include information in tabular format. In order to understand fully the financial analyses used by Morgan Stanley, the tables must be read together with the text of each summary. The tables alone do not constitute a complete description of the analyses.

      In arriving at its opinion regarding the consideration to be paid to holders of Unocal common stock, Morgan Stanley calculated the “implied blended merger consideration.” This calculation was made on the basis that, in the aggregate, 40% of the consideration in the merger would consist of $69.00 in cash for each share of Unocal common stock and 60% of the consideration in the merger would consist of 1.03 shares of Chevron common stock for each share of Unocal common stock. As a result, Morgan Stanley calculated that the implied blended merger consideration was $63.01 per share of Unocal common stock as of July 19, 2005, which was the sum of $27.60 in cash (which equals 0.40 multiplied by $69.00) plus $35.41 (which equals 0.60 multiplied by 1.03 multiplied by $57.30, the closing price of Chevron common stock on July 19, 2005). Morgan Stanley also calculated the “implied blended merger exchange ratio” by dividing the blended merger consideration of $63.01 by the per share closing price of Chevron common stock of $57.30 on July 19, 2005, which yielded a ratio of 1.0997x.

Historical Share Price Analysis

      Morgan Stanley performed an historical share price analysis to obtain background information and perspective with respect to the relative historical share prices of Unocal and Chevron common stock. Consequently, Morgan Stanley reviewed the historical price performance of Unocal and Chevron common stock from July 19, 2004 through July 19, 2005. For the period from July 20, 2004 through July 19, 2005, the closing price of Unocal’s common stock ranged from $34.71 to $66.75 and Chevron’s common stock ranged from $46.55 to $62.08. Morgan Stanley noted that the closing price of Unocal common stock on July 19, 2005 was $64.99 per share and the closing price of Chevron common stock was $57.30 per share. Morgan Stanley also noted that the per share implied blended merger consideration was $63.01 as of July 19, 2005.

“Unaffected” Price and “Unaffected” Exchange Ratio Analysis

      Morgan Stanley noted that Unocal’s common stock price had been affected by rumors appearing in the financial press and the publicly announced acquisition proposals and performed an analysis to estimate the “unaffected” price of Unocal common stock. Morgan Stanley calculated the market value weighted average return between January 5, 2005, the day prior to the first news article regarding a possible transaction in the Financial Times, and July 19, 2005 for the common stock of those companies that are comparable to Unocal (see the list of comparable companies described under “— Comparable Company Analysis” below) and a broader group of companies used by Unocal as historical benchmarks (comparable companies plus Chevron, ConocoPhillips and Kerr-McGee). Based upon and subject to the foregoing, Morgan Stanley calculated a market value weighted average return ranging from 33.7% to 47.9%. Morgan Stanley then applied the market value weighted average return to the closing price of Unocal common stock on January 5, 2005 of $41.19. These calculations yielded implied prices ranging from $55.05 to $60.91. Morgan Stanley, based on its experience with mergers and acquisitions and companies in the energy industry and taking into account the ranges expressed above and the current trading levels of companies comparable to Unocal, selected a representative “unaffected” price range from $56.00 to $61.00.

      In addition, Morgan Stanley also analyzed the “unaffected” exchange ratio using the closing price of Unocal common stock of $41.19 and closing price of Chevron common stock of $50.88 on January 5, 2005. Morgan Stanley divided the Unocal common stock price of $41.19 by Chevron’s stock price of $50.88 to derive the “unaffected” exchange ratio of 0.8096x.

      Morgan Stanley noted that the implied blended merger consideration for Unocal common stock was $63.01 per share and that the implied blended merger exchange ratio was 1.0997x, both as of July 19, 2005.

      The following table displays the implied percentage premium of the $63.01 implied blended merger consideration as of July 19, 2005 as compared to Unocal’s closing common stock prices over various periods. The following analysis was performed to provide perspective on the historical trading price of Unocal common stock versus the implied merger consideration.

     The following table displays the implied percentage premium of the 1.0997 implied blended merger exchange ratio as of July 19, 2005 as compared to the exchange ratio implied by Unocal’s and Chevron’s closing common stock prices over various periods. The following analysis was performed to provide perspective on the historical exchange ratio of Unocal and Chevron common stock versus the implied blended merger exchange ratio.

Analyst Price Targets

      Morgan Stanley reviewed the range of publicly available equity research analyst “price targets” for Unocal. As of April 1, 2005, this analysis resulted in a range of values of $45.00 to $75.00 per share of Unocal common stock. Based on equity research analyst reports published from June 22, 2005 through July 19, 2005, this analysis resulted in a range of values of $62.00 to $67.00 per share of Unocal common stock. Morgan Stanley noted that the per share implied blended merger consideration was $63.01 as of July 19, 2005.

Comparable Company Analysis

      Morgan Stanley performed a comparable company analysis, which attempts to provide an implied value for Unocal by comparing it to similar companies. For purposes of its analysis, Morgan Stanley reviewed certain public market trading multiples for the following eight public companies which, based on its experience with companies in the energy industry, Morgan Stanley considered similar to Unocal in size and business mix:

      Selected multiples, which are commonly used by participants and investors in the energy industry, for Unocal and each of the comparable companies were reviewed in this analysis. The selected multiples analyzed for these companies included the following:

EBITDAX is net earnings before interest, taxes, depreciation, depletion and amortization, impairments, exploration expenses, dry hole costs, special items and the cumulative effect of accounting changes. Morgan Stanley calculated these financial multiples and ratios based on publicly available financial data as of July 19, 2005.

      A summary of the range of market trading multiples of the comparable companies and those multiples calculated for Unocal are set forth below:

      Morgan Stanley, based on its experience with mergers and acquisitions and companies in the energy industry and taking into account the ranges expressed above, selected for its comparable company analysis

of Unocal, a representative multiple range of per share price divided by 2006 estimated cash flow of 4.9x to 5.9x and a range of aggregate value divided by 2006 estimated EBITDAX of 4.3x to 5.3x.

      Based upon and subject to the foregoing, Morgan Stanley calculated an implied valuation range for Unocal common stock of $56.75 to $68.50 per share based on a price divided by the selected 2006 estimated cash flow multiple range and $60.25 to $75.00 based on the selected aggregate value divided by the 2006 estimated EBITDAX multiple range. Morgan Stanley noted that the per share implied blended merger consideration was $63.01 per share as of July 19, 2005.

      Morgan Stanley also reviewed and analyzed certain public market trading multiples for public companies considered to be similar to Chevron from a size and business mix perspective. For purposes of this analysis, Morgan Stanley identified the following six publicly traded companies which, based on its experience with companies in the energy industry, Morgan Stanley considered similar to Chevron in size and business mix:

      The selected multiples analyzed for these companies included the following:

Morgan Stanley calculated these financial multiples and ratios based on publicly available financial data as of July 19, 2005.

      A summary of the range of market trading multiples of the comparable companies and those multiples calculated for Chevron are set forth below:

      Although the foregoing companies were compared to Unocal and Chevron for purposes of this analysis, Morgan Stanley noted that no company utilized in this analysis is identical to Unocal or Chevron because of differences between the business mix, regulatory environment, operations and other characteristics of Unocal, Chevron and the comparable companies. In evaluating the comparable companies, Morgan Stanley made judgments and assumptions with regard to industry performance, general business, economic, regulatory, market and financial conditions and other matters, many of which are beyond the control of Unocal and Chevron, such as the impact of competition on the business of Unocal and Chevron and on the industry generally, industry growth and the absence of any adverse material change in the financial condition and prospects of Unocal and Chevron or the industry or in the markets generally. Mathematical analysis (such as determining the average or median) is not in itself a meaningful method of using comparable company data.

Sum-of-the-Parts Analysis

      Morgan Stanley analyzed Unocal as the sum of its constituent business units, or as the “sum of its parts,” to determine an implied valuation range for Unocal common stock. Morgan Stanley valued Unocal’s businesses in a Sum-of-the-Parts analysis by combining two methods:

      Morgan Stanley calculated the Sum-of-the-Parts valuation range by adding the ranges of implied value per Unocal common stock for each business unit utilizing results of both methods and Unocal’s assessment of the risks associated with achieving such results. Based upon and subject to the foregoing, Morgan Stanley calculated an implied Sum-of-the-Parts valuation range for Unocal common stock of $50.75 to $71.25 per share. Morgan Stanley noted that the per share implied blended merger consideration for Unocal common stock was $63.01 per share as of July 19, 2005.

      Morgan Stanley reviewed and compared the proposed financial terms and the premia implied in the Chevron/ Unocal merger to corresponding publicly available financial terms and premia of selected transactions. In selecting these transactions Morgan Stanley reviewed corporate transactions since January 1, 2000 to the present in the energy industry. In its analysis, Morgan Stanley reviewed the following precedent transactions as of the announcement date:

      No transaction utilized in the selected precedent transactions analysis is identical to the merger. In evaluating the transactions, Morgan Stanley made judgments and assumptions with regard to industry performance, general business, economic, market and financial conditions and other matters, many of which are beyond the control of Unocal or Chevron, such as the impact of competition on Unocal or Chevron and the industry generally, industry growth and the absence of any adverse material change in the financial condition and prospects of Unocal or Chevron or in the financial markets in general. Mathematical analysis, such as determining the mean or median, or the high or the low, is not in itself a meaningful method of using comparable transaction data.

      Morgan Stanley derived from these selected transactions a reference range of premia paid relative to the trading share prices four weeks prior to and trading share prices one day prior to the deal announcement for transactions announced in two different periods of time. For transactions announced before January 1, 2003, the premium paid relative to the share price four weeks prior to deal announcement ranged from 17.6% to 75.0% with a mean of 45.0%, while the premium paid relative to the share price one day prior to deal announcement ranged from 5.8% to 51.0% with a mean of 30.9%. For transactions announced after January 1, 2003, the premium paid relative to the share price four weeks prior to deal announcement ranged from 2.7% to 33.7% with a mean of 17.8%, while the premium paid relative to the share price one day prior to deal announcement ranged from - 3.2% to 32.2% with a mean of 12.0%. Morgan Stanley then selected a premia range of 10% to 30% based on the precedent transactions as listed above and applied that range to the unaffected Unocal common stock price ranging from $56.00 to $61.00, which resulted in a valuation range of $61.50 to $79.25 per share of Unocal stock. Morgan Stanley also applied the 10-30% premia range to the unaffected exchange ratio of 0.8096x, which resulted in a valuation ranging from $51.00 to $60.25 per share of Unocal stock based on Chevron’s common stock price as of July 19, 2005.

      In addition, Morgan Stanley derived from these selected transactions a reference range of aggregate value divided by year 1 EBITDAX multiple range for transactions announced in two different periods of time. The aggregate value divided by year 1 EBITDAX multiple range for transactions announced before January 1, 2003 ranged from 4.1x to 10.0x with a mean of 6.1x. The aggregate value divided by year 1 EBITDAX multiple range for transactions announced after January 1, 2003 ranged from 4.0x to 8.3x with a mean of 6.0x. Morgan Stanley then selected an aggregate value divided by year 1 EBITDAX multiple range of 5.0x to 6.5x based on the precedent transactions as listed above and applied that range to Unocal 2005E EBITDAX which resulted in a valuation range of $73.25 to $96.25.

      Morgan Stanley noted that the per share implied blended merger consideration was $63.01 as of July 19, 2005.

Contribution Analysis

      Morgan Stanley compared the contribution, based on research analyst estimates and I/B/E/S estimates, of each of Unocal and Chevron to pro forma combined company statistics. The implied contribution by Unocal, based on a variety of operating and market statistics, ranged from 3.0% to 15.7%. Based on an exchange ratio of 1.03x and assuming 100% stock ownership, the pro forma ownership of the combined company by Unocal’s stockholders was approximately 11.8%, and assuming 100% stock ownership based on the implied blended exchange ratio of 1.0997x, the pro forma ownership of the combined company by Unocal stockholders was approximately 12.5%.

Pro Forma Analysis

      Morgan Stanley analyzed the pro forma impact of the acquisition on Chevron’s pro forma earnings per share and pro forma cash flow per share. Such analysis was based on 2005 and 2006 earnings and cash

flow projections based on I/B/E/S estimates. The analysis assumed a purchase price of $63.01 per share of Unocal common stock, which represents an exchange ratio of 1.03x for 60% stock consideration plus 40% cash consideration at $69.00 per share, based on the per share closing price of Chevron’s common stock on July 19, 2005. In addition, the analysis assumed annual pretax synergies of $325 million. Based upon and subject to the foregoing, Morgan Stanley observed that the earnings per share impact of the merger for Chevron stockholders was approximately 1.5% accretion in 2005 and approximately 1.0% accretion in 2006. Morgan Stanley also observed that the cash flow per share impact of the acquisition for Chevron stockholders was approximately 9.3% accretion in 2005 and 9.6% accretion in 2006. The analysis did not take into account any one-time charges.

      Furthermore, Morgan Stanley analyzed the pro forma impact of the merger on Chevron’s return on capital employed in 2006. Such analysis was based on 2006 earnings projections based on I/B/E/S estimates. The analysis assumed a purchase price of $63.01 per share of Unocal common stock, which represented exchange ratios of 1.03x for 60% stock consideration plus 40% cash consideration at $69.00 per share, based on the per share closing price of Chevron’s common stock on July 19, 2005. Based on these assumptions, Morgan Stanley calculated the pro forma return on capital employed as approximately 22.1% in 2006.

      Morgan Stanley performed a variety of financial and comparable analyses for purposes of rendering its opinion. The preparation of a fairness opinion is a complex process and is not susceptible to partial analysis or summary description. In arriving at its opinion, Morgan Stanley considered the results of all of its analyses as a whole and did not attribute any particular weight to any analysis or factor considered. Furthermore, Morgan Stanley believes that the summary provided and the analyses described above must be considered as a whole and that selecting any portion of the analyses, without considering all of them, would create an incomplete view of the process underlying Morgan Stanley’s analysis and opinion. As a result, the ranges of valuations resulting from any particular analysis or combination of analyses described above should not be taken to be the view of Morgan Stanley with respect to the actual value of Unocal or Chevron or their common stock.

      In performing its analyses, Morgan Stanley made numerous assumptions with respect to the industry performance, general business, regulatory and economic conditions and other matters, many of which are beyond the control of Morgan Stanley, Unocal or Chevron. Any estimates contained in the analysis of Morgan Stanley are not necessarily indicative of future results or actual values, which may be significantly more or less favorable than those suggested by such estimates. The analyses performed were prepared solely as part of the analyses of Morgan Stanley of the fairness of the consideration to be received by holders of shares of Unocal common stock pursuant to the amended merger agreement from a financial point of view, and were prepared in connection with the delivery by Morgan Stanley of its opinion on July 21, 2005 to Unocal’s board of directors.

      The merger consideration was determined through arm’s-length negotiations between Unocal and Chevron and was approved by Unocal’s board of directors. Morgan Stanley provided advice to Unocal during these negotiations. Morgan Stanley did not, however, recommend any specific merger consideration to Unocal or that any specific merger consideration constituted the only appropriate merger consideration for the merger. Consequently, the analyses as described above should not be viewed as determinative of the opinion of Unocal’s board of directors with respect to the merger consideration or of whether Unocal’s board of directors would have been willing to agree to a different merger consideration. Moreover, these analyses do not purport to be appraisals or to reflect the prices at which shares of common shares of Unocal might actually trade. The foregoing summary does not purport to be a complete description of the analyses performed by Morgan Stanley.

      Morgan Stanley is an internationally recognized investment banking and advisory firm. Morgan Stanley, as part of its investment banking business, is continuously engaged in the valuation of businesses and their securities in connection with mergers and acquisitions, negotiated underwritings, competitive biddings, secondary distributions of listed and unlisted securities, private placements and valuations for corporate, estate and other purposes. In the ordinary course of its business, Morgan Stanley and its affiliates may from time to time trade in the securities or the indebtedness of Unocal, Chevron and their

affiliates or any currencies or commodities (or derivative thereof) for its own account, the accounts of investment funds and other clients under the management of Morgan Stanley and for the accounts of its customers and accordingly, may at any time hold a long or short position in such securities, indebtedness, currencies or commodities (or derivative thereof) for any such account. In the past, Morgan Stanley and its affiliates have provided financial advisory and financing services for both Unocal and Chevron and have received fees from Chevron for the rendering of these services. Morgan Stanley may also seek to provide such services to Chevron in the future and may receive fees in connection with such services.

      Pursuant to an engagement letter dated February 17, 2005, Unocal has agreed to pay Morgan Stanley a customary transaction fee of approximately $29 million (based on closing stock prices as of July 21, 2005), a significant portion of which is contingent upon the consummation of the merger. Unocal has also agreed to reimburse Morgan Stanley for its fees and expenses incurred in performing its services. In addition, Unocal has agreed to indemnify Morgan Stanley and its affiliates, their respective directors, officers, agents and employees and each person, if any, controlling Morgan Stanley or any of its affiliates against certain liabilities and expenses, including certain liabilities under the federal securities laws, related to or arising out of Morgan Stanley’s engagement and any related transactions.

ADDITIONAL INFORMATION FOR STOCKHOLDERS

Where You Can Find More Information

      Chevron and Unocal file annual, quarterly and special reports, proxy statements and other information with the SEC. You may read and copy any reports, statements or other information we file at the SEC’s public reference room at 450 Fifth Street, N.W., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the operation of the public reference room. Our SEC filings are also available to the public from commercial document retrieval services and at the web site maintained by the SEC at http://www.sec.gov.

      Chevron filed a registration statement on Form S-4 to register with the SEC the Chevron common stock to be issued to Unocal stockholders in the merger. This supplement to the proxy statement/ prospectus and the proxy statement/ prospectus dated June 29, 2005 are a part of that registration statement and constitute a prospectus of Chevron in addition to being a proxy statement of Unocal for the special meeting of Unocal stockholders. As allowed by SEC rules, this supplement does not contain all the information you can find in the registration statement or the exhibits to the registration statement.

      If you need additional copies of this supplement, the June 29 proxy statement/ prospectus or a new proxy card, you should contact MacKenzie Partners, Inc., 105 Madison Avenue, New York, NY 10016 and telephone (800) 322-2885. If you need an additional election form, you should contact the exchange agent, Mellon Investor Services, 85 Challenger Road, Ridgefield Park, NJ 07660 and telephone (866) 865-6324.

Documents Incorporated by Reference

      The SEC allows us to “incorporate by reference” information into this supplement, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is deemed to be part of this supplement, except for any information superseded by information in, or incorporated by reference in, this supplement. This supplement incorporates by reference the documents set forth below that we have previously filed with the SEC. These documents contain important information about our companies and their finances.

Chevron SEC Filings (File No. 1-368-2)

Unocal SEC Filings (File No. 1-8483)

      We are also incorporating by reference all documents that we file with the SEC pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act between the date of the June 29 proxy statement/ prospectus and the date of the Unocal stockholder meeting.

      Chevron has supplied all information contained or incorporated by reference into this supplement relating to Chevron, and Unocal has supplied all such information relating to Unocal.

      If you are a stockholder, we may have sent you some of the documents incorporated by reference, but you can obtain any of them through us or the SEC. Documents incorporated by reference are available from us without charge, excluding all exhibits unless we have specifically incorporated by reference an exhibit in this supplement. You may obtain documents incorporated by reference into this supplement by requesting them in writing or by telephone from the appropriate party at the following address:

      If you would like to request documents from us, please do so by August 5, 2005, to receive them before the meeting.

      You can also get more information by visiting Chevron’s web site at www.chevron.com and Unocal’s web site at www.unocal.com. Web site materials are not part of this supplement.

      You should rely only on the information contained or incorporated by reference into this supplement and the June 29 proxy statement/ prospectus to vote on the proposals described in this document. We have not authorized anyone to provide you with information that is different from what is contained in the supplement and June 29 proxy statement/ prospectus. This supplement is dated July 22, 2005. You should not assume that the information contained in this supplement is accurate as of any date other than such date, and neither the mailing of this supplement to stockholders nor the issuance of Chevron common stock in the merger shall create any implication to the contrary.

ANNEX A

AMENDMENT NO. 1 TO

AGREEMENT AND PLAN OF MERGER

      This Amendment No. 1 to Agreement and Plan of Merger (this “Amendment”) dated as of July 19, 2005 by and among Unocal Corporation (the “Company”), Chevron Corporation (“Parent”) and Blue Merger Sub Inc. (“Merger Subsidiary”);

W I T N E S S E T H:

      WHEREAS, the Company, Parent and Merger Subsidiary are parties to that certain Agreement and Plan of Merger dated as of April 4, 2005 (the “Merger Agreement”);

      WHEREAS, pursuant to Section 10.3(a) of the Merger Agreement, the Company, Parent and Merger Subsidiary desire to amend the Merger Agreement as provided in this Amendment; and

      WHEREAS, the respective Boards of Directors of the Company, Parent and Merger Subsidiary have deemed this Amendment advisable and in the best interests of their respective companies;

      NOW, THEREFORE, in consideration of the foregoing and the mutual agreements herein made and for other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties agree as follows:

      Section 1.     Amendments to Merger Consideration Provisions.

      (a) Section 1.4(a) of the Merger Agreement is hereby amended and restated in its entirety as follows:

      (a) At the Effective Time, subject to the other provisions of Articles 1 and 2, each share of Company Common Stock issued and outstanding immediately prior to the Effective Time (other than shares of Company Common Stock owned by Parent, Merger Subsidiary or the Company or any of their respective wholly-owned subsidiaries and except for any Dissenting Shares), together with the Company Rights attached thereto or associated therewith, shall, by virtue of this Agreement and without any action on the part of the holder thereof, be converted into and shall thereafter represent the right to receive the following consideration (collectively, the “Merger Consideration”):

      (b) Section 1.6 is hereby amended and restated in its entirety as follows:

      Notwithstanding anything in this Agreement to the contrary, with respect to each share of Company Common Stock as to which the holder thereof shall have properly complied with the provisions of section 262 of the DGCL as to appraisal rights (each, a “Dissenting Share”), if any, such holder shall be entitled to payment, solely from the Surviving Corporation, of the appraisal value of the Dissenting Shares to the extent permitted by and in accordance with the provisions of section 262 of the DGCL; provided, however, that (i) if any holder of Dissenting Shares, under the circumstances permitted by and in accordance with the DGCL, affirmatively withdraws his demand for appraisal of such Dissenting Shares, (ii) if any holder of Dissenting Shares fails to establish his entitlement to appraisal rights as provided in the DGCL or (iii) if any holder of Dissenting Shares takes or fails to take any action the consequence of which is that such holder is not entitled to payment for his shares under the DGCL, such holder or holders (as the case may be) shall forfeit the right to appraisal of such shares of Company Common Stock and such shares of Company Common Stock shall thereupon cease to constitute Dissenting Shares and if such forfeiture shall occur following the Election Deadline, each such share of Company Common Stock shall thereafter be deemed to have been converted into and to have become, as of the Effective Time, the right to receive, without interest thereon, the Per Share Mixed Consideration; provided that each such share shall instead be converted into the right to receive the Per Share Stock Consideration if either (x) Parent shall have received an opinion from McDermott Will & Emery LLP or (y) the Company shall have received an opinion from Wachtell, Lipton, Rosen & Katz, in either case, to the effect that the Merger would otherwise fail to satisfy the continuity of interest requirement under Section 368 of the Code. The Company shall give Parent prompt notice of any demands received by the Company for appraisal of shares of Company Common Stock, and Parent shall have the right to participate in all negotiations and proceedings with respect to such demands. The Company shall not settle, make any payments with respect to, or offer to settle, any claim with respect to Dissenting Shares without the written consent of Parent.

      (c) Each reference to “Per Share Cash Consideration” is hereby changed to a reference to “Per Share Cash Election Consideration.”

      Section 2.     Representations and Warranties.

      (a) The Company represents and warrants to Parent and Merger Subsidiary as follows:

      (b) Parent represents and warrants to the Company as follows:

      (c) Merger Subsidiary represents and warrants to the Company as follows:

      Section 3.     Ratification of Merger Agreement. Except as otherwise provided herein, all of the terms, covenants and other provisions of the Merger Agreement are hereby ratified and confirmed and shall continue to be in full force and effect in accordance with their respective terms, except that the waiver, dated June 23, 2005, granted to the Company by Parent shall remain in full force and effect in accordance with its terms. After the date hereof, all references to the Merger Agreement shall refer to the Merger Agreement as amended by this Amendment. Capitalized terms used but not defined in this Amendment shall have the meanings assigned to them in the Merger Agreement.

      Section 4.     Counterparts. This Amendment may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Amendment shall become effective when each party hereto shall have received counterparts hereof signed by all of the other parties hereto.

      IN WITNESS WHEREOF, the parties have caused this Amendment No. 1 to Agreement and Plan of Merger to be duly executed by their respective authorized officers as of the day and year first above written.

July 21, 2005

Board of Directors

Unocal Corporation

2141 Rosecrans Avenue, Suite 4000

El Segundo, California 90245

Members of the Board:

      We understand that Unocal Corporation (“Unocal” or the “Company”), Chevron Corporation (“Chevron” or the “Parent”), and Blue Merger Sub Inc. (“Merger Sub”), a wholly owned subsidiary of the Parent, have entered into Amendment No. 1 to Agreement and Plan of Merger dated as of July 19, 2005 (the “Amendment”), which amends certain terms of the Agreement and Plan of Merger dated as of April 4, 2005 by and among the Company, the Parent and Merger Sub (the “Original Merger Agreement” and, as amended by the Amendment, the “Amended Merger Agreement”). The Amended Merger Agreement provides, among other things, for the merger (the “Merger”) of the Company with and into Merger Sub. Pursuant to the Merger, the separate existence of the Company will cease and Merger Sub will continue as the surviving corporation and a wholly owned subsidiary of Parent. In addition, each issued and outstanding share of common stock, par value $1.00 per share, of the Company (the “Company Common Stock”), other than shares held in treasury or held by Parent or Merger Sub or any wholly-owned subsidiaries of the Company, Parent or Merger Sub, or as to which dissenters’ rights have been perfected, will be converted into the right to receive, at the holder’s direction, either (i) 1.03 shares of common stock, par value $0.75 per share, of Parent (“Parent Common Stock”) (the “Stock Consideration”) or (ii) $69 in cash without interest (the “Cash Consideration”) or (iii) the combination of (a) $27.60 in cash and (b) 0.618 shares of Parent Common Stock (together with the Stock Consideration and the Cash Consideration, the “Consideration”), subject to proration, in the case of (i) and (ii), as set forth in the Amended Merger Agreement. The terms and conditions of the Merger are more fully set forth in the Amended Merger Agreement.

      You have asked for our opinion as to whether the Consideration to be received by the holders of shares of Company Common Stock pursuant to the Amended Merger Agreement is fair from a financial point of view to such holders.

      For purposes of the opinion set forth herein, we have:

      We have assumed and relied upon without independent verification the accuracy and completeness of the information supplied or otherwise made available to us by the Company and the Parent for the purposes of this opinion. With respect to the financial projections and other financial and operating data, we have assumed that they have been reasonably prepared on bases reflecting the best currently available estimates and judgments of the future financial performance of the Company and the Parent. We have relied, without independent verification, on the assessment by the management of the Company of the strategic rationale of the Merger, including information related to certain strategic, financial and operational benefits anticipated from the Merger. In addition, we have assumed that the Merger will be consummated in accordance with the terms set forth in the Amended Merger Agreement without material modification, waiver or delay, including among other things, that the Merger will be treated as a tax-free reorganization, pursuant to the Internal Revenue Code of 1986, as amended. Morgan Stanley has assumed that in connection with the receipt of all the necessary regulatory approvals for the proposed Merger, no restrictions will be imposed that would have a material adverse effect on the contemplated benefits expected to be derived in the proposed Merger. We have not made any independent valuation or appraisal of the assets or liabilities of the Company or the Parent. With respect to the reserve estimates and reports referred to above, we are not experts in the engineering evaluation of oil and gas properties and, with your consent, we have relied, without independent verification, solely upon the internal reserve estimates of the Company. In addition, we are not legal, regulatory or tax experts and have relied, without independent verification, on the assessment of the Company and the Parent and their advisors with respect to such matters. Our opinion is necessarily based on financial, economic, market and other conditions as in effect on, and the information made available to us as of, the date hereof.

      We understand that CNOOC Limited has proposed to acquire the Company for $67 per share of Company Common Stock in cash (the “CNOOC Proposal”) and that the Company has engaged in discussions with CNOOC Limited regarding the CNOOC Proposal. We have not been asked to express, and we are not expressing, any opinion herein as to the CNOOC Proposal or any transaction other than the Merger, nor have we been asked to express, and we are not expressing, any opinion herein as to the relative merits of or consideration offered in the Merger as compared to the CNOOC Proposal. Our opinion does not address the underlying business decision to enter the Merger.

      We have acted as financial advisor to the Board of Directors of the Company in connection with this transaction and will receive a fee for our services, a significant portion of which is contingent upon the closing of the Merger. In the past, Morgan Stanley & Co. Incorporated (“Morgan Stanley”) and its affiliates have provided financial advisory and financing services for the Company and Chevron and have received fees from Chevron for the rendering of these services. Morgan Stanley may also seek to provide such services to Chevron in the future and may receive fees in connection with such services. In addition, Morgan Stanley is a full service securities firm engaged in securities trading, investment management and brokerage services. In the ordinary course of its trading, brokerage, investment management and financing activities, Morgan Stanley or its affiliates may actively trade the debt and equity securities or senior loans of the Company or the Parent, or any currencies or commodities (or derivatives thereof) for its own accounts or for the accounts of its customers or its managed investment accounts and, accordingly, may at any time hold long or short positions in such securities, senior loans, currencies or commodities (or derivatives thereof).

      It is understood that this letter is for the information of the Board of Directors of the Company and may not be disclosed or referred to publicly or used for any other purpose without our prior written consent, except that this opinion may be included in its entirety in any filing made by the Company or the Parent in respect of the Merger with the U.S. Securities and Exchange Commission if such inclusion is required by applicable law. This opinion does not in any manner address the prices at which the Parent Common Stock will trade at any time, and Morgan Stanley expresses no opinion or recommendation as to how the shareholders of the Company should vote at the shareholders’ meeting held in connection with the Merger or what election such shareholders should make with respect to the Consideration.

      Based upon and subject to the foregoing, we are of the opinion on the date hereof that the Consideration to be received by the holders of shares of Company Common Stock pursuant to the Amended Merger Agreement is fair from a financial point of view to such holders.

ANNEX C

NOT EXECUTED

Draft dated July 2005

AGREEMENT AND PLAN OF MERGER

among

CNOOC LIMITED,

WEST ACQUISITION CORP.

and

UNOCAL CORPORATION

Dated as of                         , 2005

TABLE OF CONTENTS

      AGREEMENT AND PLAN OF MERGER, dated as of                     , 2005 (as the same may be amended from time to time, this “Agreement”), among CNOOC Limited, a Hong Kong company (“Parent”), West Acquisition Corp., a Delaware corporation and a wholly-owned Subsidiary of Parent (“Merger Sub”), and Unocal Corporation, a Delaware corporation (the “Company”).

W I T N E S S E T H:

      WHEREAS, the respective Boards of Directors of Parent, Merger Sub and the Company have approved the merger of Merger Sub with and into the Company upon the terms and subject to the conditions set forth in this Agreement;

      WHEREAS, the respective Boards of Directors of Parent, Merger Sub and the Company have approved and declared advisable this Agreement and the merger of Merger Sub with and into the Company, as set forth below (the “Merger”), in accordance with the General Corporation Law of the State of Delaware (the “DGCL”) and upon the terms and subject to the conditions set forth in this Agreement;

      WHEREAS, in connection with the execution and delivery of this Agreement, and as an inducement to the Company to enter into this Agreement, (i) China National Offshore Oil Corporation, a company organized under the laws of the People’s Republic of China and an indirect holder of approximately 70.6% of the issued share capital of Parent (the “Majority Parent Shareholder”), is entering into an agreement with the Company in the form attached hereto as Exhibit A (the “Voting Agreement”), pursuant to which the Majority Parent Shareholder has agreed, on the terms and subject to the conditions set forth therein, to vote all of the ordinary shares of Parent that are owned by the Majority Parent Shareholder in favor of the transactions contemplated by this Agreement and (ii) Parent, the other parties listed on the signature pages thereof and the escrow agent referred to therein (the “Escrow Agent”) have entered into an escrow agreement in the form attached hereto as Exhibit B (the “Escrow Agreement”) pursuant to which, among other things, Parent has deposited certain collateral to be released subject to the terms and conditions set forth therein; and

      WHEREAS, immediately prior to the execution hereof, (i) the Chevron Agreement has been terminated pursuant to Section 9.1(b) or 9.1(d) thereof, as the case may be, and (ii) Parent has made, at the request of and on behalf of the Company, the payments to Chevron Corporation (“Chevron”) that are contemplated by clauses (x) and (y) of Section 10.5 of the Chevron Agreement (as defined herein), which payments are subject to the terms set forth in Section 7.2 herein, and are treated for U.S. federal income tax purposes as a direct or indirect capital contribution and/or subscription for capital stock of the Surviving Corporation to be issued following consummation of the Merger.

      NOW THEREFORE, in consideration of the foregoing and the representations, warranties, covenants and agreements contained herein, and intending to be legally bound hereby, Parent, Merger Sub and the Company agree as follows:

ARTICLE I

The Merger

      Section 1.1     The Merger. At the Effective Time (as defined in Section 1.3), upon the terms and subject to the conditions set forth in this Agreement and in accordance with the applicable provisions of the DGCL, Merger Sub shall be merged with and into the Company, whereupon the separate corporate existence of Merger Sub shall cease, and the Company shall continue as the surviving corporation in the Merger (the “Surviving Corporation”) and a wholly-owned subsidiary of Parent.

      Section 1.2     Closing. The closing of the Merger (the “Closing”) shall take place at the offices of Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York at 10:00 a.m., local time, on a date to be specified by the parties (the “Closing Date”) which shall be no later than the second business day after the satisfaction or waiver (to the extent permitted by applicable Law (as defined in Section 3.7(a)) of the conditions set forth in Article VI (other than those conditions that by their nature are to be satisfied by action

at the Closing, but subject to the satisfaction or waiver of such conditions), or at such other place, date and time as the Company and Parent may agree in writing.

      Section 1.3     Effective Time. On the Closing Date, immediately after the Closing, the parties shall cause the Merger to be consummated by executing and filing a certificate of merger (the “Certificate of Merger”) with the Secretary of State of the State of Delaware and make all other filings or recordings required under the DGCL in connection with the Merger. The Merger shall become effective at such time as the Certificate of Merger is duly filed with the Secretary of State of the State of Delaware, or at such later time as the parties shall agree and as shall be set forth in the Certificate of Merger (such time as the Merger becomes effective is referred to herein as the “Effective Time”).

      Section 1.4     Effects of the Merger. The effects of the Merger shall be as provided in this Agreement and in the applicable provisions of the DGCL. Without limiting the generality of the foregoing, at the Effective Time, all the property, rights, privileges, powers and franchises of the Company and Merger Sub shall vest in the Surviving Corporation, and all debts, liabilities and duties of the Company and Merger Sub shall become the debts, liabilities and duties of the Surviving Corporation, all as provided under the applicable laws of the State of Delaware.

      Section 1.5     Certificate of Incorporation and Bylaws of the Surviving Corporation.

      (a) The certificate of incorporation of the Company in effect at the Effective Time shall be the certificate of incorporation of the Surviving Corporation until amended (subject to Section 5.9 of this Agreement) in accordance with applicable Law.

      (b) The bylaws of the Company in effect at the Effective Time shall be the bylaws of the Surviving Corporation until amended (subject to Section 5.9 of this Agreement) in accordance with applicable Law.

      Section 1.6     Directors. Immediately prior to the Effective Time, the then current directors of the Company shall nominate the then current directors of Merger Sub (the “Merger Sub Directors”) to serve as directors of the Company for election by the Company’s stockholder(s). Such nomination shall be conditional upon the Closing occurring. Immediately after the Effective Time, Parent, as sole stockholder of the Company, shall elect the Merger Sub Directors as directors of the Surviving Corporation. Subject to applicable Law, the Merger Sub Directors shall be the initial directors of the Surviving Corporation and shall hold office until their respective successors are duly elected and qualified, or their earlier death, resignation or removal.

      Section 1.7     Officers. The officers of the Company immediately prior to the Closing Date shall be the initial officers of the Surviving Corporation and shall hold office until their respective successors are duly elected and qualified, or their earlier death, resignation or removal.

ARTICLE II

Conversion of Shares; Exchange of Certificates

      Section 2.1     Effect on Stock. At the Effective Time, by virtue of the Merger and without any action on the part of the Company, Merger Sub or the holders of any securities of the Company or Merger Sub:

      Section 2.2     Exchange of Certificates.

      (a) Paying Agent. Prior to the Effective Time, Parent shall deposit, or shall cause to be deposited, with a U.S. bank or trust company that shall be appointed to act as a paying agent hereunder and approved in advance by the Company (which approval shall not be unreasonably withheld) (the “Paying Agent”), in trust for the benefit of holders of the Shares, the Company Stock Options (as hereinafter defined) and the Company Stock-Based Awards (as hereinafter defined), cash in U.S. dollars sufficient to pay (i) the aggregate Merger Consideration in exchange for all of the Shares outstanding immediately prior to the

Effective Time (other than the Cancelled Shares and the Dissenting Shares), payable upon due surrender of the certificates that immediately prior to the Effective Time represented Shares (“Certificates”) (or effective affidavits of loss in lieu thereof) and Shares represented by book-entry (“Book-Entry Shares”), in each case together with a letter of transmittal, pursuant to the provisions of this Article II, (ii) the Option and Stock-Based Consideration (as hereinafter defined) payable pursuant to Section 5.5, and (iii) the Estimated Aggregate Make-Whole Amount (as hereinafter defined) (such cash referred to in subsections (a)(i), (a)(ii) and (a)(iii), together with any Supplemental Make-Whole Funds, being hereinafter referred to as the “Exchange Fund”).

      (b) Payment Procedures. (i) As soon as reasonably practicable after the Effective Time and in any event not later than the second business day following the Effective Time, the Paying Agent shall mail (x) to each holder of record of Shares whose Shares were converted into the Merger Consideration pursuant to Section 2.1, (i) a letter of transmittal (which shall specify that delivery shall be effected, and risk of loss and title to Certificates shall pass, only upon delivery of Certificates (or effective affidavits of loss in lieu thereof) or Book-Entry Shares to the Paying Agent and shall be in such form and have such other provisions as Parent and the Company may reasonably specify), and (ii) instructions for use in effecting the surrender of Certificates (or effective affidavits of loss in lieu thereof) or Book-Entry Shares in exchange for the Merger Consideration and (y) to each holder of a Company Stock Option or a Company Stock-Based Award, a check in an amount due and payable to such holder pursuant to Section 5.5 hereof in respect of such Company Stock Option or Company Stock-Based Award.

      (ii) Upon surrender of Certificates (or effective affidavits of loss in lieu thereof) or Book-Entry Shares to the Paying Agent together with such letter of transmittal, duly completed and validly executed in accordance with the instructions thereto, and such other documents as may customarily be required by the Paying Agent, the holder of such Certificates or Book-Entry Shares shall be entitled to receive in exchange therefor a check in an amount equal to the product of (x) the number of Shares represented by such holder’s properly surrendered Certificates (or effective affidavits of loss in lieu thereof) or the number of Book-Entry Shares (as applicable) multiplied by (y) the Merger Consideration. No interest will be paid or accrued on any amount payable upon due surrender of Certificates or Book-Entry Shares. In the event of a transfer of ownership of Shares that is not registered in the transfer records of the Company, a check for any cash to be paid upon due surrender of the Certificate may be paid to such a transferee if the Certificate formerly representing such Shares is presented to the Paying Agent, accompanied by all documents required to evidence and effect such transfer and to evidence that any applicable stock transfer Taxes have been paid or are not applicable. Until surrendered as contemplated by this Section 2.2, each Certificate or Book-Entry Share shall be deemed at any time after the Effective Time to represent only the right to receive upon such surrender the applicable Merger Consideration as contemplated by this Article II.

      (iii) For the avoidance of doubt, the Paying Agent or the Surviving Corporation, as the case may be, shall be entitled to deduct and withhold from the consideration otherwise payable under this Agreement to any holder of Shares or holder of Company Stock Options or Company Stock-Based Awards, such amounts as are required to be withheld or deducted under the Internal Revenue Code of 1986, as amended (the “Code”) or any provision of U.S. state, local or foreign Tax (as hereinafter defined) Law with respect to the making of such payment. To the extent that amounts are so withheld or deducted and paid over to the applicable Governmental Entity, such withheld or deducted amounts shall be treated for all purposes of this Agreement as having been paid to the holder of the Shares or holder of the Company Stock Options or Company Stock-Based Awards, in respect of which such deduction and withholding were made. If any withholding or deduction is required to be made under the Laws of any Relevant Jurisdiction from the consideration otherwise payable under this Agreement to any holder of Shares or holder of Company Stock Options or Company Stock-Based Awards (except to the extent that, under Laws of general application which are not directly or indirectly targeted at this Agreement and do not have any disproportionate impact on the intended recipients of such consideration hereunder relative to stockholders of companies which engage in similar transactions, such withholding or deduction arises as a result of the holder being or having been resident for Tax purposes in, performing or having performed services in, or otherwise having or having had a taxable presence (other than solely by reason of receiving the consideration otherwise payable under this Agreement)

in any Relevant Jurisdiction), the amount of such payment to such holder of Shares or holder of Company Stock Options or Company Stock-Based Awards shall be increased to an amount which ensures that, after the making of that withholding or deduction, the holder entitled to receive such payment receives and retains a net sum equal to the payment which it would have received and retained had no such withholding or deduction been required (such increase being hereinafter referred to as the “Per Holder Make-Whole Amount”). The total amount of funds necessary and sufficient to ensure that each holder of Shares and each holder of Company Stock Options or Company Stock-Based Awards receives in full the Per Holder Make-Whole Amount to which such holder is entitled pursuant to the foregoing sentence shall hereinafter be referred to as the “Aggregate Make-Whole Amount.” Prior to the Effective Time, Parent shall deposit with the Paying Agent, in accordance with Section 2.2(a) hereof, an amount of funds in cash which in Parent’s good faith estimate shall be equal to or exceed the Aggregate Make-Whole Amount (such estimate, the “Estimated Aggregate Make-Whole Amount”). If, at any time after the Effective Time, the Aggregate Make-Whole Amount exceeds the Estimated Aggregate Make-Whole Amount, Parent shall deposit with the Paying Agent, from time to time, such funds (the “Supplemental Make-Whole Funds”) as are necessary and sufficient to ensure that the sum of (x) the Estimated Aggregate Make-Whole Amount and (y) the Supplemental Make-Whole Funds equals or exceeds at all times the Aggregate Make-Whole Amount.

      (c) Closing of Transfer Books. At the Effective Time, the stock transfer books of the Company shall be closed, and there shall be no further registration of transfers on the stock transfer books of the Surviving Corporation of the Shares that were outstanding immediately prior to the Effective Time. If, after the Effective Time, Certificates are presented to the Surviving Corporation or Parent for transfer, they shall be cancelled and exchanged for a check in the proper amount pursuant to this Article II.

      (d) Termination of Exchange Fund. Any portion of the Exchange Fund (including the proceeds of any investments thereof) that remains undistributed to the former holders of Shares for one year after the Effective Time shall be delivered to the Surviving Corporation upon demand, and any former holders of Shares who have not theretofore complied with this Article II shall thereafter look only to the Surviving Corporation for payment of their claim for the Merger Consideration, without any interest thereon, upon due surrender of their Shares.

      (e) No Liability. Notwithstanding anything herein to the contrary, none of the Company, Parent, Merger Sub, the Surviving Corporation, the Paying Agent or any other person shall be liable to any former holder of Shares for any amount properly delivered to a public official pursuant to any applicable abandoned property, escheat or similar Law. If any Certificate or Book-Entry Share shall not have been surrendered prior to such date on which any Merger Consideration payable to the holder of such Certificate or Book-Entry Share pursuant to this Article II would otherwise escheat to or become the property of any Governmental Entity, any such Merger Consideration in respect of such Certificate or Book-Entry Share shall, to the extent permitted by applicable Law, become the property of the Surviving Corporation, free and clear of any claims of any person previously entitled thereto.

      (f) Investment of Exchange Fund. The Paying Agent shall invest all cash included in the Exchange Fund as directed by Parent; provided, however, that any investment of such cash shall be limited to direct short-term obligations of, or short-term obligations fully guaranteed as to principal and interest by, the United States government. Any interest and other income resulting from such investments shall be paid to Parent on a current basis.

      Section 2.3     Lost Certificates. In the case of any Certificate that has been lost, stolen or destroyed, upon the making of an affidavit of that fact by the person claiming such Certificate to be lost, stolen or destroyed and, if required by the Paying Agent, the posting by such person of a bond in customary amount as indemnity against any claim that may be made against it with respect to such Certificate, the Paying Agent will issue in exchange for such lost, stolen or destroyed Certificate a check in the amount of the number of Shares represented by such lost, stolen or destroyed Certificate multiplied by the Merger Consideration.

ARTICLE III

Representations and Warranties of the Company

      Except as to matters disclosed in either (a) the Company SEC Documents (as hereinafter defined) filed or furnished prior to the Escrow Date or (b) the corresponding section of the Disclosure Schedule delivered by the Company to Parent immediately prior to the execution of this Agreement (the “Company Disclosure Schedule”) (it being agreed that disclosure of any item in any section of the Company Disclosure Schedule shall also be deemed disclosure with respect to any other section of this Agreement to which the relevance of such item is reasonably apparent), the Company represents and warrants to Parent and Merger Sub as follows:

      Section 3.1     Qualification, Organization, Subsidiaries, etc. Each of the Company and its Subsidiaries is a legal entity duly organized, validly existing and in good standing under the Laws of its respective jurisdiction of organization and has all requisite corporate or similar power and authority to own, lease and operate its properties and assets and to carry on its business as presently conducted and is qualified to do business and is in good standing as a foreign corporation in each jurisdiction where the ownership, leasing or operation of its assets or properties or conduct of its business requires such qualification, except where the failure to be so organized, validly existing, qualified or in good standing, or to have such power or authority, would not, individually or in the aggregate, reasonably be expected to have a Company Material Adverse Effect. The Company has made available to Parent, prior to the Escrow Date, a true and complete copy of the Company’s restated certificate of incorporation and by-laws, each as amended through the Escrow Date. “Company Material Adverse Effect” means a material adverse effect on the financial condition, business, liabilities, assets or continuing results of operations of the Company and its Subsidiaries, taken as a whole, except to the extent resulting from (i) any changes in general United States or global economic conditions, (ii) the announcement or the existence of, or compliance with, this Agreement and the transactions contemplated hereby, or (iii) any changes affecting the oil and gas industry in general (including changes to commodity prices).

      Section 3.2     Capital Stock.

      (a) The authorized capital stock of the Company consists of 750,000,000 shares of Company Common Stock and 100,000,000 shares of preferred stock, par value $0.10 per share (“Company Preferred Stock”), of which 5,000,000 shares are designated as Series B Junior Participating Preferred Stock (“Series B Preferred Stock”). As of June 29, 2005, there were (i) 272,295,814 shares of Company Common Stock outstanding (and an additional 71,683 shares pending issuance upon settlement of employee stock option exercises that occurred on June 28, 2005 and June 29, 2005), (ii) an additional 16,537,992 shares of Company Common Stock were held in treasury, (iii) outstanding options to purchase an aggregate of approximately 5,501,471 shares of Company Common Stock at a weighted average exercise price of $37.1321 per share, (iv) an aggregate of 21,531,331 shares of Company Common Stock reserved for issuance under stock-based compensation arrangements, including the 5,501,471 shares underlying the outstanding employee and director stock options, and (v) no shares of Series B Preferred Stock (all of which are reserved for issuance in accordance with the Rights Agreement, dated as of January 5, 2000, between the Company and Mellon Investor Services, LLC (formerly known as ChaseMellon Shareholder Services L.L.C.), as Rights Agent (as amended, the “Rights Agreement”)) or any other shares of Company Preferred Stock outstanding. All the outstanding Shares are, and all Shares reserved for issuance as noted in clauses (i), (iii) and (iv) above shall be, when issued in accordance with the respective terms thereof, duly authorized, validly issued and are fully paid and non assessable and free of preemptive rights. No Company Subsidiary owns any shares of capital stock of the Company.

      (b) Except as set forth in subsection (a) above and except for changes since June 29, 2005 resulting from the exercise of employee stock options and other stock-based compensation arrangements outstanding on such date, (i) the Company does not have any shares of its capital stock issued or outstanding and (ii) there are no outstanding subscriptions, options, warrants, calls, convertible or exchangeable securities (whether debt or equity) or other similar rights, agreements or commitments relating to the issuance of capital stock to which the Company or any of the Company’s Subsidiaries is a party obligating the Company or any of the Company’s Subsidiaries to (A) issue, transfer or sell any shares of capital stock or other equity interests of the

Company or any Subsidiary of the Company or securities convertible into or exchangeable for such shares or equity interests; (B) grant, extend or enter into any such subscription, option, warrant, call, convertible or exchangeable securities (whether debt or equity) or other similar right, agreement, arrangement or commitment to issue capital stock or other equity interests; (C) repurchase, redeem or otherwise acquire any such shares of capital stock or other equity interests; or (D) provide a material amount of funds to, or make any material investment (in the form of a loan, capital contribution or otherwise) in, any Subsidiary.

      (c) Neither the Company nor any of its Subsidiaries has outstanding bonds, debentures, notes or other obligations, the holders of which have the right to vote (or which are convertible into or exercisable for securities having the right to vote) with the stockholders of the Company on any matter.

      (d) There are no voting trusts or other agreements or understandings to which the Company or any of its Subsidiaries is a party with respect to the voting of the capital stock or other equity interest of the Company or any of its Subsidiaries.

      Section 3.3     Corporate Authority Relative to this Agreement; No Violation.

      (a) The Company has requisite corporate power and authority to enter into this Agreement and, subject to receipt of the Company Stockholder Approval, to consummate the transactions contemplated hereby, including the Merger. The execution and delivery of this Agreement and the consummation of the transactions contemplated hereby have been duly and validly authorized by the Board of Directors of the Company and, except for (i) the Company Stockholder Approval and (ii) the filing of the Certificate of Merger with the Secretary of State of Delaware, no other corporate proceedings on the part of the Company are necessary to authorize the consummation of the transactions contemplated hereby. The Board of Directors of the Company has taken all necessary action so that none of the restrictions set forth in Section 203 of the DGCL (the “Interested Stockholder Statute”) or article Seventh of the Company’s restated certificate of incorporation (assuming the accuracy of Parent’s representation in Section 4.9 of this Agreement) will be applicable to this Agreement and the transactions contemplated hereby. The Board of Directors of the Company has (i) determined that this Agreement and the transactions contemplated hereby are fair to and in the best interests of the Company and its stockholders and (ii) resolved, subject to Section 5.3 of this Agreement, to recommend to such stockholders that they approve and adopt this Agreement and the transactions contemplated hereby. This Agreement has been duly and validly executed and delivered by the Company and, assuming this Agreement constitutes the valid and binding agreement of Parent and Merger Sub, constitutes the valid and binding agreement of the Company, enforceable against the Company in accordance with its terms.

      (b) Other than in connection with or in compliance with (i) the filing of the Certificate of Merger with respect to the Merger with the Delaware Secretary of State and appropriate documents with the relevant authorities of other states in which the Company is qualified to do business, (ii) compliance with the Hong Kong Companies Ordinance (the “HK Companies Ordinance”), (iii) compliance with any applicable requirements of the Hart-Scott Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”) and any foreign Laws that are designed or intended to prohibit, restrict or regulate actions having the purpose or effect of monopolization or restraint of trade or lessening competition through mergers, acquisitions or otherwise (the “Foreign Antitrust Laws”), including those in Argentina, Brazil and Canada (if applicable), (iv) compliance with any applicable requirements of the Securities Exchange Act of 1934 (as amended, the “Exchange Act”), the Rules (the “HKEx Listing Rules”) Governing the Listing of Securities on the Stock Exchange of Hong Kong Limited (the “HKEx”) and any other applicable securities Laws, (v) the appropriate applications, filings and notices to, and approval of, the HKEx and the New York Stock Exchange (the “NYSE”), (vi) compliance with Section 721 of the Defense Production Act of 1950, as amended (“Exon-Florio”), (vii) filings with and approvals that are required to be obtained from any Governmental Entity in the People’s Republic of China, including those with and by the National Development and Reform Commission, (viii) the filing of a Form BE-13 by the Company with the U.S. Department of Commerce and (ix) the approvals set forth on Section 3.3(b) of the Company Disclosure Schedule, no authorization, consent or approval of, or filing with, any United States or foreign governmental or regulatory agency, commission, court, body, entity or authority (each, a “Governmental Entity”) is necessary, under applicable Law (as

hereinafter defined), for the consummation by the Company of the transactions contemplated by this Agreement, except for such authorizations, consents, approvals or filings that, if not obtained or made, would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect (which term shall be interpreted, for purposes of this Section 3.3(b), without clause (ii) in the definition thereof) or prevent the Company’s consummation of the transactions contemplated by this Agreement.

      (c) The execution, delivery and performance by the Company of this Agreement does not, and the consummation of the transactions contemplated hereby and compliance with the provisions hereof will not (i) result in any violation of, or default (with or without notice or lapse of time, or both) under, or give rise to a right of consent, termination, cancellation or acceleration of any obligation or to the loss of a material benefit under any loan, guarantee of indebtedness or credit agreement, note, bond, mortgage, indenture, lease, agreement, contract, instrument, permit, concession, franchise, right or license binding upon the Company or any of the Company’s Subsidiaries or result in the creation of any liens, claims, mortgages, encumbrances, pledges, security interests, equities or charges of any kind (each, a “Lien”), other than any such Lien (A) for Taxes not yet due, or being contested in good faith and for which adequate accruals or reserves have been established, or (B) which is a carriers’, warehousemen’s, mechanics’, materialmen’s, repairmen’s or other like lien arising in the ordinary course of business (each, a “Permitted Lien”) upon any of the properties or assets of the Company or any of the Company’s Subsidiaries, (ii) conflict with or result in any violation of any provision of the certificate of incorporation or by-laws or other equivalent organizational document, in each case as amended, of the Company or any of the Company’s Subsidiaries or (iii) conflict with or violate any Laws (as hereinafter defined) applicable to the Company or any of the Company’s Subsidiaries or any of their respective properties or assets, other than, in the case of clauses (i) and (iii), any such violation, conflict, consent, default, termination, cancellation, acceleration, loss or Lien that would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect (which term shall be interpreted, for purposes of this Section 3.3(c), without clause (ii) in the definition thereof) or prevent the Company’s consummation of the transactions contemplated by this Agreement.

      Section 3.4     Reports and Financial Statements.

      (a) The Company has filed or furnished all forms, documents and reports required to be filed or furnished by it with the Securities and Exchange Commission (the “SEC”) since December 31, 2003 (the “Company SEC Documents”). As of their respective dates, or, if amended prior to the Escrow Date, as of the date of the last such amendment, the Company SEC Documents complied as to form in all material respects with the requirements of the Securities Act of 1933 (the “Securities Act”) and the Exchange Act, as the case may be, and the applicable rules and regulations promulgated thereunder, and none of the Company SEC Documents contained any untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading.

      (b) The audited consolidated financial statements and unaudited consolidated interim financial statements of the Company (including any related notes and schedules) included in its annual reports on Form 10-K for its fiscal years ended December 31, 2003 and 2004 and in its quarterly reports on Form 10-Q for its fiscal quarters ended after December 31, 2004 present fairly, in all material respects, the consolidated financial position of the Company and its consolidated Subsidiaries as of the dates thereof and the consolidated results of their operations and their cash flows for the periods then ended (subject to normal year-end adjustments and the absence of notes in the case of any unaudited interim financial statements), in each case in conformity with United States generally accepted accounting principles (“GAAP”) applied on a consistent basis (except as may be indicated in the notes thereto).

      Section 3.5     Internal Controls and Procedures; the Sarbanes-Oxley Act.

      (a) The Company has (i) designed and maintained disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) to ensure that material information required to be disclosed by the Company in the reports it files or furnishes under the Exchange Act is communicated to its management by others within those entities as appropriate to allow timely decisions regarding required disclosure, (ii) disclosed, based on its most recent evaluation, to its auditors and the audit committee of its Board of

Directors (A) any significant deficiencies or material weaknesses in the design or operation of internal controls over financial reporting which could adversely affect its ability to record, process, summarize and report financial data and (B) any fraud, whether or not material, that involves management or other employees who have a significant role in its internal controls over financial reporting and (iii) identified for the Company’s auditors any material weaknesses in internal controls. The Company has made available to Parent true and correct copies of any of the foregoing disclosures to the auditors or audit committee that have been made in writing from January 1, 2003 through the Escrow Date, and will promptly provide to Parent true and correct copies of any such disclosure that is made after the Escrow Date.

      (b) The Company has designed and maintains a system of internal controls over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) sufficient to provide reasonable assurance concerning the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP, including reasonable assurances (i) that transactions are executed in accordance with management’s general or specific authorizations and recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain asset accountability and (ii) regarding prevention or timely detection of any unauthorized acquisition, use or disposition of assets that could have a material effect on the Company’s financial statements. The Company’s management, with the participation of the Company’s principal executive and financial officers, has completed an assessment of the effectiveness of the Company’s internal controls over financial reporting in compliance with the requirements of Section 404 of the Sarbanes-Oxley Act for the year ended December 31, 2004, and such assessment concluded that such internal controls were effective using the framework specified in the Company’s annual report on Form 10-K for its fiscal year ended December 31, 2004.

      (c) No personal loan or other extension of credit by the Company or any of its Subsidiaries to any of its or their executive officers or directors has been made or modified (other than as permitted by Section 13 of the Exchange Act and Section 402 of the Sarbanes-Oxley Act) since July 31, 2002.

      (d) Since January 1, 2003, (i) neither the Company nor any of its Subsidiaries nor, to the Company’s knowledge, any director, officer, employee, auditor, accountant or representative of the Company or any of its Subsidiaries has received any written complaint, allegation, assertion, or claim that the Company or any of its Subsidiaries has engaged in improper or illegal accounting or auditing practices or maintains improper or inadequate internal accounting controls and (ii) no attorney representing the Company or any of its Subsidiaries, whether or not employed by the Company or any of its Subsidiaries, has reported evidence of a material violation of U.S. federal or state securities laws, a material breach of fiduciary duty or similar material violation by the Company, any of its Subsidiaries or any of their respective officers, directors, employees or agents to any officer of the Company, the Board of Directors of the Company or any member or committee thereof.

      Section 3.6     No Undisclosed Liabilities. As of the Escrow Date, except (i) as reflected or reserved against in the Company’s consolidated balance sheets (or the notes thereto) included in the Company SEC Documents, (ii) for liabilities and obligations incurred in the ordinary course of business since December 31, 2004, (iii) for liabilities or obligations which have been discharged or paid in full in the ordinary course of business and (iv) for liabilities or obligations that would not reasonably be expected, individually or in the aggregate, to have a Company Material Adverse Effect, neither the Company nor any Subsidiary of the Company has any liabilities or obligations of any nature, whether or not accrued, contingent, absolute, determined, determinable or otherwise.

      Section 3.7     Compliance with Law; Permits.

      (a) To the Company’s knowledge, neither the Company nor any of its Subsidiaries is in violation of, or, since January 1, 2002, has violated, any applicable provisions of any federal, state, local, or foreign law, statute, treaty, protocol, ordinance, rule, regulation, judgment, order, injunction, decree, agency requirement, license or permit of any Governmental Entity (collectively, the “Laws” and each, a “Law”), except for any violations that, individually or in the aggregate, have not had and would not reasonably be expected to have a Company Material Adverse Effect. Notwithstanding anything contained in this Section 3.7(a), no representation or

warranty shall be deemed to be made in this Section 3.7(a) in respect of the matters referenced in Section 3.5, or in respect of environmental, Tax, employee benefits or labor Laws matters.

      (b) The Company and the Company’s Subsidiaries are in compliance with all franchises, grants, authorizations, licenses, permits, easements, variances, exceptions, consents, approvals and orders of any Governmental Entity necessary for the Company and the Company’s Subsidiaries to own, lease or operate their properties and assets or to carry on their businesses as conducted as of the Escrow Date (the “Company Permits”), except where the failure to have or comply with any of the Company Permits has not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect.

      (c) Without limiting the generality of the foregoing and except as would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect, to the knowledge of the Company’s Management Committee, since January 1, 2002, neither the Company nor any of its Subsidiaries nor any director, officer, employee or agent of the Company or any of its Subsidiaries has (a) used any funds for unlawful contributions, gifts, entertainment, or other unlawful expenses relating to political activity or (b) made any unlawful payment to any government official or employee or to any political party or campaign or violated any provision of the Foreign Corrupt Practices Act of 1977, as amended.

      Section 3.8     Environmental Laws and Regulations. Except as, individually or in the aggregate, would not reasonably be expected to have a Company Material Adverse Effect, (i) no notice, notification, demand, request for information, citation, summons, complaint or order has been received by, and no investigation, action, claim, suit, proceeding or review is pending or, to the knowledge of the Company, threatened by any person against the Company or any of its Subsidiaries, and no penalty has been assessed against the Company or any of its Subsidiaries, in each case, with respect to any matters arising out of any Environmental Law; (ii) the Company and its Subsidiaries are in compliance with all Environmental Laws; (iii) there are no liabilities of the Company or any of its Subsidiaries arising out of any Environmental Law, whether accrued, contingent, absolute, or determined, and, to the knowledge of the Company, there is no existing condition, situation or set of circumstances which would reasonably be expected to result in such a liability; and (iv) there has been no material environmental investigation, study, audit, test, review or other analysis conducted since January 1, 2005 of which the Company has knowledge in relation to any current or prior business of the Company or any of its Subsidiaries or any property or facility now or previously owned, leased or operated by the Company or any of its Subsidiaries which has not been delivered to Parent prior to the Escrow Date. For purposes of this Section 3.8, the term “Environmental Law” means federal, state, local and foreign statutes, laws (including, without limitation, common law), judicial decisions, regulations, ordinances, rules, judgments, orders, codes, injunctions, permits, governmental agreements or governmental restrictions relating to: (A) the protection, investigation or restoration of the environment or natural resources, (B) the handling, use, presence, disposal, Release or threatened Release of any Hazardous Substance or (C) noise, odor, indoor air, employee exposure, electromagnetic fields, wetlands, pollution, contamination or any injury or threat of injury to persons or property relating to any Hazardous Substance. As used herein, the term “Hazardous Substance” means any “hazardous substance” and any “pollutant or contaminant” as those terms are defined in the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended (“CERCLA”); any “hazardous waste” as that term is defined in the Resource Conservation and Recovery Act, as amended (“RCRA”); and any “hazardous material” as that term is defined in the Hazardous Materials Transportation Act (49 U.S.C. § 1801 et seq.), as amended (including as those terms are further defined, construed, or otherwise used in rules, regulations, standards, orders, guidelines, directives, and publications issued pursuant to, or otherwise in implementation of, said Laws); and including, without limitation, any petroleum product or byproduct, solvent, flammable or explosive material, radioactive material, asbestos, lead paint, polychlorinated biphenyls (or PCBs), dioxins, dibenzofurans, heavy metals, radon gas, mold, mold spores and mycotoxins. As used herein, the term “Release” means any spilling, leaking, pumping, pouring, emitting, emptying, discharging, injecting, escaping, leaching, dumping, placing, discarding, abandonment, or disposing into the environment (including the placing, discarding or abandonment of any barrel, container or other receptacle containing any Hazardous Substance or other material).

      Section 3.9     Employee Benefit Plans.

      (a) Section 3.9(a) of the Company Disclosure Schedule lists all material Company Benefit Plans. “Company Benefit Plans” means all employee benefit plans, compensation arrangements and other benefit arrangements, whether or not “employee benefit plans” (within the meaning of Section 3(3) of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), whether or not subject to ERISA), providing cash- or equity-based incentives, health, medical, dental, disability, accident or life insurance benefits or vacation, severance, retirement, pension or savings benefits, that are sponsored, maintained or contributed to by the Company or any of its Subsidiaries for the benefit of employees, directors, consultants, former employees, former consultants and former directors of the Company or its Subsidiaries and all employee agreements providing compensation, vacation, severance or other benefits to any officer, employee, consultant or former employee of the Company or its Subsidiaries, except to the extent providing benefits imposed or implied by applicable foreign Law. The Company has, prior to the Escrow Date, made available copies of all such material Company Benefit Plans. “U.S. Company Benefit Plans” means all Company Benefit Plans other than Foreign Benefit Plans (as defined in Section 3.9(g) of this Agreement).

      (b) No “accumulated funding deficiency,” as defined in Section 412 of the Code, has been incurred with respect to any U.S. Company Benefit Plan subject to such Section 412, whether or not waived except as has not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect. Neither the Company nor any other entity which is a member of a controlled group of entities (within the meaning of Sections 414(b), (c), (m) or (o) of the Code) of which the Company is a member (each, an “ERISA Affiliate”) has engaged in, or is a successor or parent corporation to an entity that has engaged in, a transaction described in Sections 4069 or 4212(c) of ERISA or incurred, or reasonably expects to incur prior to the Effective Time, (i) any liability under Title IV of ERISA arising in connection with the termination of, or a complete or partial withdrawal from, any plan covered or previously covered by Title IV of ERISA or (ii) any liability under Section 4971 of the Code that in either case could become a liability of the Company or any of its Subsidiaries or Parent or any of its ERISA Affiliates after the Effective Time, in each case, except as has not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect.

      (c) Neither the Company nor any ERISA Affiliate nor any predecessor thereof contributes to, or has in the past contributed to, any multiemployer plan, as defined in section 3(37) of ERISA (a “Multiemployer Plan”) except as has not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect.

      (d) Each U.S. Company Benefit Plan has been maintained and administered in compliance with its terms, with the requirements prescribed by any and all statutes, orders, rules and regulations that are applicable to such Plan, and with ERISA and the Code to the extent applicable thereto, except for such non compliance which has not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect. Any Company Benefit Plan intended to be qualified under Section 401(a) or 401(k) of the Code has received a favorable determination letter from the Internal Revenue Service and each trust forming a part of such plan is exempt from federal income Tax pursuant to Section 501(a) of the Code, other than a failure to qualify or lack of an exemption as has not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect. Neither the Company nor its Subsidiaries maintains or contributes to any plan or arrangement which, and no U.S. Company Benefit Plan provides, or has any liability to provide medical benefits to any employee or former employee following his retirement, except as required by applicable Law or as provided in individual agreements upon a severance event.

      (e) The consummation of the transactions contemplated by this Agreement will not, either alone or in combination with another event, (A) entitle any current or former employee, consultant or officer of the Company or any its Subsidiaries to severance pay, unemployment compensation or any other payment, except as expressly provided in this Agreement or as required by applicable Law, or (B) accelerate the time of payment or vesting, increase the amount of compensation due any such employee, consultant or officer or trigger any other material obligation pursuant to any Company Benefit Plan, except as expressly provided in

this Agreement. Section 3.9 of the Company Disclosure Schedule lists all the agreements, arrangements and other instruments which give rise to an obligation to make or set aside amounts payable to or on behalf of the officers of the Company and the officers of any of its Subsidiaries as a result of the transactions contemplated by this Agreement and/or any subsequent employment termination, true and complete copies of which have been previously provided to Parent.

      (f) There has been no amendment to or change in employee participation or coverage under, any Company Benefit Plan that would increase materially the expense of maintaining such Company Benefit Plan above the level of the expense incurred in respect thereof for the 12 months ended on December 31, 2004.

      (g) With respect to each Company Benefit Plan that is not subject to United States Law (a “Foreign Benefit Plan”): (i) all employer and employee contributions to each Foreign Benefit Plan required by Law or by the terms of such Foreign Benefit Plan have been made, or, if applicable, accrued in accordance with GAAP, except for such contributions or accruals which have not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect, (ii) each Foreign Benefit Plan required to be registered has been registered and has been maintained in good standing with applicable regulatory authorities, except for such failures to maintain which have not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect and (iii) each Foreign Benefit Plan has been maintained in substantial compliance with its terms and with the requirements prescribed by any and all applicable Laws (including any special provisions relating to qualified plans where such Foreign Benefit Plan was intended so to qualify), except for such noncompliance which has not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect. The Company will promptly upon request of Parent furnish or make available copies of any such Foreign Benefit Plan.

      Section 3.10     Absence of Certain Changes or Events. From December 31, 2004 through the Escrow Date, other than the transactions contemplated by this Agreement, the businesses of the Company and its Subsidiaries have been conducted in the ordinary course of business consistent with past practice; and since December 31, 2004, there has not been:

      Section 3.11     Investigations; Litigation. As of the Escrow Date, there is no

      Section 3.12     Proxy Statement; Other Information.

      (a) None of the information with respect to the Company or its Subsidiaries to be included in the Proxy Statement (as defined below) will, at the time of the mailing of the Proxy Statement or any amendments or supplements thereto, and at the time of the Company Meeting, contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading. The Proxy Statement will comply as to form in all material respects with the provisions of the Exchange Act and the rules and regulations promulgated thereunder. The letters to stockholders, notices of meeting, proxy statement and forms of proxies to be distributed to stockholders in connection with the Merger and any schedules required to be filed with the SEC in connection therewith are collectively referred to herein as the “Proxy Statement.”

      (b) None of the information to be supplied by or on behalf of the Company for inclusion or incorporation by reference in any filing by Parent with the HKEx in respect of the transactions contemplated hereby or in connection herewith (including a circular to shareholders of Parent pursuant to the HKEx Listing Rules (together with any amendments or supplements, the “Parent Circular” and together with any other documents required to be filed with the HKEx in connection with the transactions contemplated hereby, the “Parent Disclosure Documents”) will, in the case of each of the Parent Disclosure Documents, at the time of the filing thereof, at the time of the mailing thereof to the shareholders of Parent and at the time of the Parent Shareholder Meeting contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading.

      Section 3.13     Rights Plan. The Board of Directors of the Company has resolved to, and the Company after the execution of this Agreement will, take all action necessary to render the rights to purchase shares of Series B Preferred Stock of the Company, issued pursuant to the terms of the Rights Agreement, inapplicable to the Merger, this Agreement and the transactions contemplated hereby.

      Section 3.14     Tax Matters.

      (a) Except as would not, individually or in the aggregate, reasonably be expected to have a Company Material Adverse Effect, (i) the Company and each of its Subsidiaries have prepared and timely filed (taking into account any extension of time within which to file) all Tax Returns required to be filed by any of them and all such filed Tax Returns are complete and accurate; (ii) the Company and each of its Subsidiaries have paid all Taxes that are required to be paid by any of them, except, in the case of clause (i) or clause (ii) hereof, with respect to matters for which adequate reserves have been established; (iii) the U.S. consolidated federal income Tax Returns of the Company have been examined by the Internal Revenue Service (or the period for assessment of the Taxes in respect of which such Tax Returns were required to be filed has expired); (iv) as of the Escrow Date, there are not pending or, to the knowledge of the Company threatened in writing, any audits, examinations, investigations or other proceedings in respect of Taxes or Tax matters; (v) there are no Liens for Taxes on any of the assets of the Company or any of its Subsidiaries other than Permitted Liens; (vi) none of the Company or any of its Subsidiaries has been a “controlled corporation” or a “distributing corporation” in any distribution occurring during the last 30 months that was purported or intended to be governed by Section 355 of the Code (or any similar provision of state, local or foreign Law); (vii) the Company has complied with all Laws applicable to the withholding and payment over of Taxes, and has timely withheld and paid over to the proper Governmental Entities all amounts required to be so withheld and paid over; and (viii) there are no agreements, understandings or arrangements relating to material Taxes between the Company or any of its Subsidiaries and any Governmental Entity that will be terminated or the operation or effect of which will be amended, changed or altered in any material respect as a result of the Merger.

      (b) For purposes of this Agreement: (i) “Taxes” means any and all domestic or foreign, federal, state, local or other taxes of any kind (together with any and all interest, penalties, additions to tax and additional amounts imposed with respect thereto) imposed by any Governmental Entity, including taxes on or with respect to income, franchises, windfall or other profits, gross receipts, property, sales, use, capital stock, payroll, employment, unemployment, social security, workers’ compensation or net worth, and taxes in the nature of excise, severance, withholding, ad valorem or value added; and (ii) “Tax Return” means any return, report or similar filing (including the attached schedules) required to be filed with respect to Taxes, including any information return, claim for refund, amended return, or declaration of estimated Taxes.

      Section 3.15     Labor Matters. Except to the extent imposed by applicable foreign Law, as of the Escrow Date, neither the Company nor any of its Subsidiaries is a party to, or bound by, any collective bargaining agreement (or similar agreement or arrangement in any foreign country) with employees, a labor union or labor organization. Except for such matters which have not had, and would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect, (a) as of the Escrow Date, (i) there are no strikes or lockouts with respect to any employees of the Company or any of its Subsidiaries (“Employees”), (ii) to the knowledge of the Company, there is no union organizing effort

pending or threatened against the Company or any of its Subsidiaries, (iii) there is no unfair labor practice, labor dispute (other than routine individual grievances) or labor arbitration proceeding pending or, to the knowledge of the Company, threatened against the Company or any of its Subsidiaries and (iv) there is no slowdown, or work stoppage in effect or, to the knowledge of the Company, threatened with respect to Employees and (b) the Company and its Subsidiaries are in compliance with all applicable Laws respecting (i) employment and employment practices, (ii) terms and conditions of employment and wages and hours and (iii) unfair labor practices. Neither the Company nor any of its Subsidiaries has any liabilities under the Worker Adjustment and Retraining Notification Act as a result of any action taken by the Company (other than at the written direction of Parent or as a result of the Merger) that would reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect.

      Section 3.16     Intellectual Property. Except as would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect, (i) either the Company or Subsidiary of the Company owns, or is licensed or otherwise possesses legally enforceable rights to use, all Intellectual Property Rights used in their respective businesses as currently conducted, and (ii) the consummation of the transactions will not alter or impair such rights. There are no pending or, to the knowledge of the Company, threatened claims by any person alleging infringement by the Company or its Subsidiaries for their use of any Intellectual Property Rights in their respective businesses as currently conducted that would reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect. Except as would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect, the conduct of businesses of the Company and its Subsidiaries does not infringe and has not infringed upon any Intellectual Property Rights or any other proprietary right of any person. As of the Escrow Date, neither the Company nor any of its Subsidiaries has made any claim of a violation or infringement by others of its rights to or in connection with the Intellectual Property Rights which violation or infringement has had, or would be reasonably expected to have, individually or in the aggregate, a Company Material Adverse Effect. Except as would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect, all Intellectual Property Rights owned or licensed by the Company or a Subsidiary of the Company are valid and enforceable. As used herein, “Intellectual Property Rights” means trademarks, trade names, service marks, service names, mark registrations, logos, assumed names, registered and unregistered copyrights, trade secrets, inventions, patents or applications and registrations therefor.

      Section 3.17     Opinion of Financial Advisor. The Board of Directors of the Company has received the opinion of Morgan Stanley dated the date of this Agreement, substantially to the effect that, as of such date, the Merger Consideration is fair to the holders of the Company Common Stock from a financial point of view.

      Section 3.18     Required Vote of the Company Stockholders. The affirmative vote of the holders of outstanding Shares, voting together as a single class, representing at least a majority of all the votes entitled to be cast thereupon by holders of Company Common Stock, is the only vote of holders of securities of the Company which is required to approve and adopt this Agreement and the transactions contemplated hereby (the “Company Stockholder Approval”).

      Section 3.19     Hydrocarbon Contracts.

      (a) Except in each case as would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect: (i) the Hydrocarbon Contracts (as defined below) are in full force and effect in accordance with their respective terms; (ii) all royalties, rentals and other payments due thereunder have been properly and timely paid; (iii) there are currently pending no written requests or demands for payments, adjustments of payments or performance pursuant thereto; (iv) none of the Company or any of its Subsidiaries is in breach of any of its obligations under any Hydrocarbon Contracts; and (v) to the knowledge of the Company, no other party to any Hydrocarbon Contract is in breach of any of its obligations thereunder. The term “Hydrocarbon Contract” means a material Hydrocarbon production sharing contract, lease or license, permit or other similar agreement or right permitting the Company or any of its Subsidiaries to explore for, develop, use, produce, sever, process, operate and occupy Hydrocarbon interests and associated fixtures or structures for a specified period of time. The term “Hydrocarbon Contract” also includes any farm-out or farm-in agreement, operating agreement, unit agreement, pooling or communitization agreement,

declaration or order, joint venture, option or acquisition agreement, any oil and gas production, sales, marketing, transportation, exchange and processing contract and agreement, or any other contract affecting the ownership or operation of properties held for exploration or production of Hydrocarbons, or the disposition of the Hydrocarbons produced therefrom, in each case to which the Company or any of its Subsidiaries is a party. The term “Hydrocarbons” means any of oil, bitumen and products derived therefrom, synthetic crude oil, petroleum, natural gas, natural gas liquids, coal bed methane and any and all other substances produced in association with any of the foregoing, whether liquid, solid or gaseous.

      (b) Except in each case as would not reasonably be expected to have, individually or in the aggregate, a Company Material Adverse Effect, (i) the Company and its Subsidiaries have filed with the applicable government authorities all applications and obtained all licenses, permits and other authorizations required for operations under the Hydrocarbon Contracts, and (ii) the Company and its Subsidiaries have complied with all rules and regulations of any applicable government authority with respect to operations under the Hydrocarbon Contracts.

      Section 3.20     Material Contracts. Except for this Agreement and except as set forth in the Company SEC Documents, as of the Escrow Date, neither the Company nor any of its Subsidiaries is a party to or bound by any “material contract” (as such term is defined in Item 601(b)(10) of Regulation S-K of the Commission) (any contract of the type described in this Section 3.20 being referred to herein as a “Company Material Contract”).

      Section 3.21     Finders or Brokers. Except for Morgan Stanley, a copy of whose engagement agreement has been made available to Parent, neither the Company nor any of its Subsidiaries has employed any investment banker, broker or finder in connection with the transactions contemplated by this Agreement who might be entitled to any fee or any commission in connection with or upon consummation of the Merger.

ARTICLE IV

Representations and Warranties of Parent and Merger Sub

      Except as disclosed in the Parent SEC Documents (as hereinafter defined) filed or furnished prior to the Escrow Date or in the corresponding section of the Disclosure Schedule delivered by Parent to the Company immediately prior to the execution of this Agreement (the “Parent Disclosure Schedule”) (it being agreed that disclosure of any item in any section of the Parent Disclosure Schedule shall also be deemed disclosure with respect to any other section of this Agreement to which the relevance of such item is reasonably apparent), Parent and Merger Sub represent and warrant to the Company as follows:

      Section 4.1     Qualification; Organization, Subsidiaries, etc. Each of Parent and its Subsidiaries is a legal entity duly organized, validly existing and (as relates to Merger Sub) in good standing under the Laws of its respective jurisdiction of organization and has all requisite corporate or similar power and authority to own, lease and operate its properties and assets and to carry on its business as presently conducted and is qualified to do business and is in good standing as a foreign corporation in each jurisdiction where the ownership, leasing or operation of its assets or properties or conduct of its business requires such qualification, except where the failure to be so organized, validly existing, qualified or in good standing, or to have such power or authority, would not, individually or in the aggregate, reasonably be expected to prevent or materially delay or materially impair the ability of Parent or Merger Sub to consummate the Merger and the other transactions contemplated by this Agreement, including, without limitation, the Financing (as hereinafter defined) (a “Parent Material Adverse Effect”). Parent has made available to the Company, prior to the Escrow Date, a true and complete copy of Parent’s certificate of incorporation and by-laws, each as amended through the Escrow Date.

      Section 4.2     Corporate Authority Relative to this Agreement; No Violation.

      (a) Each of Parent and Merger Sub has all requisite corporate power and authority to enter into this Agreement and, subject to receipt of the Parent Shareholder Approval (as defined below), to consummate the transactions contemplated hereby, including the Merger and the Financing. The execution and delivery of this

Agreement and the consummation of the transactions contemplated hereby, including the Financing, have been duly and validly authorized by the Boards of Directors of Parent and Merger Sub and, except for (i) the affirmative vote (the “Parent Shareholder Approval”) of holders of a simple majority of ordinary shares, nominal value H.K.$0.02 per share, of Parent (“Parent Ordinary Shares”) present and voting on a show of hands (or, if on a poll, the holders of a simple majority of the votes attaching to the Parent Ordinary Shares who vote in person or by proxy) at the Parent Shareholder Meeting in favor of the transactions contemplated by this Agreement (the “Parent Proposal”), in which vote the Parent Ordinary Shares held directly or indirectly by the Majority Parent Shareholder will be entitled to vote and be counted, and (ii) the filing of the Certificate of Merger with the Secretary of State of Delaware, no other corporate proceedings on the part of Parent or Merger Sub are necessary to authorize the consummation of the transactions contemplated hereby, including the Financing. This Agreement has been duly and validly executed and delivered by Parent and Merger Sub and, assuming this Agreement constitutes a valid and binding agreement of the Company, this Agreement constitutes the valid and binding agreement of Parent and Merger Sub, enforceable against Parent and Merger Sub in accordance with its terms. At a meeting duly called and held, Parent’s Board of Directors has approved and adopted this Agreement and the transactions contemplated by this Agreement.

      (b) Other than in connection with or in compliance with (i) the filing of the Certificate of Merger with respect to the Merger with the Delaware Secretary of State and appropriate documents with the relevant authorities of other states in which the Company is qualified to do business, (ii) compliance with the HK Companies Ordinance, (iii) compliance with any applicable requirements of the HSR Act and Foreign Antitrust Laws, including those in Argentina, Brazil and Canada (if applicable), (iv) compliance with any applicable requirements of the Securities Act, the Exchange Act, the HKEx Listing Rules (the rules of which, with respect to all shareholder approvals required in connection with the Merger and the Financing, shall be satisfied upon the Majority Parent Shareholder’s compliance with the Voting Agreement) and any other applicable securities Laws, (v) the appropriate applications, filings and notices to, and approval of, the HKEx and the NYSE, (vi) compliance with Exon-Florio, (vii) filings with and approvals that are required to be obtained from any Governmental Entity in the People’s Republic of China, including those with and by the National Development and Reform Commission and (viii) the filing of a Form BE-13 by the Company with the U.S. Department of Commerce, no authorization, consent or approval of, or filing with, any United States or foreign Governmental Entity is necessary, under applicable Law, for the consummation by Parent or Merger Sub of the transactions contemplated by this Agreement, except for such authorizations, consents, approvals or filings that, if not obtained or made, would not reasonably be expected to have, individually or in the aggregate, a Parent Material Adverse Effect.

      (c) The Majority Parent Shareholder, Overseas Oil and Gas Corporation, Limited, a Bermuda company and CNOOC (BVI) Limited, a British Virgin Islands company, each of which is a wholly-owned subsidiary of the Majority Parent Shareholder (collectively, the “Majority Parent Shareholder Subsidiaries”), have all requisite corporate power and authority to enter into the Voting Agreement and to comply with their obligations thereunder, including voting all of the Parent Ordinary Shares beneficially owned by the Majority Parent Shareholder (the “Majority Parent Shares”) in favor of the transactions contemplated by this Agreement. The Majority Parent Shareholder and the Majority Parent Shareholder Subsidiaries have all requisite power and authority to exercise the voting rights attached to the Majority Parent Shares at the Parent Shareholder Meeting (including, without limitation, with respect to any shareholder resolutions, whether under the HKEx Listing Rules, the Hong Kong Companies Ordinance, or otherwise) necessary or appropriate to ensure that Parent and its directors have all necessary powers, authorities and permissions to complete the transactions contemplated by this Agreement, including the Financing and any alternative financings proposed by Parent and relating to the transactions contemplated by this Agreement (any such resolutions, the “Parent Resolutions”). There is no impediment, regulatory or otherwise, to the Majority Parent Shareholder’s or the Majority Parent Shareholder Subsidiaries’ exercise of the voting rights attached to any of the Majority Parent Shares in favor of the transactions contemplated by this Agreement (including the Merger, the Financing and any alternative financings proposed by Parent and relating to the transactions contemplated by this Agreement). Assuming the Majority Parent Shareholder complies with its obligations under the Voting Agreement, the Parent Resolutions shall be adopted. Neither Parent nor any Affiliate thereof has received any

indication, written or otherwise, from the HKEx that would indicate any inaccuracy with respect to the representation set forth in this Section 4.2(c).

      (d) The execution, delivery and performance by Parent and Merger Sub of this Agreement does not, and the consummation of the transactions contemplated hereby, including the Financing, and compliance with the provisions hereof will not (i) result in any violation of, or default (with or without notice or lapse of time, or both) under, or give rise to a right of consent, termination, cancellation or acceleration of any obligation or to the loss of a material benefit under any loan, guarantee of indebtedness or credit agreement, note, bond, mortgage, indenture, lease, agreement, contract, instrument, permit, concession, franchise, right or license binding upon Parent or any of its Subsidiaries or result in the creation of any Lien (other than Permitted Liens) upon any of the properties or assets of Parent or any of its Subsidiaries, (ii) conflict with or result in any violation of any provision of the certificate of incorporation or by-laws or other equivalent organizational document, in each case as amended, of Parent or any of its Subsidiaries or (iii) conflict with or violate any Laws applicable to Parent, any of its Subsidiaries or any of their respective properties or assets, other than, in the case of clauses (i) and (iii), any such violation, conflict, default, right, loss or Lien that has not had, and would not reasonably be expected to have, individually or in the aggregate, a Parent Material Adverse Effect.

      Section 4.3     Reports and Financial Statements.

      (a) Parent has filed or furnished all forms, documents and reports required to be filed or furnished by it with the SEC since December 31, 2003 (the “Parent SEC Documents”). As of their respective dates, or, if amended prior to the Escrow Date, as of the date of the last such amendment, the Parent SEC Documents complied as to form in all material respects with the requirements of the Securities Act and the Exchange Act, as the case may be, and the applicable rules and regulations promulgated thereunder, and none of the Parent SEC Documents contained any untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading.

      (b) The audited consolidated financial statements and unaudited consolidated interim financial statements of Parent (including any related notes and schedules) included in the Parent SEC Documents fairly present in all material respects the consolidated financial position of Parent and its consolidated Subsidiaries, as of the dates thereof and the consolidated results of their operations and their cash flows for the periods then ended (subject to normal year-end adjustments and the absence of notes in the case of any unaudited interim financial statements), in each case in conformity with accounting principles generally accepted in Hong Kong applied on a consistent basis (except as may be indicated in the notes thereto).

      Section 4.4     Investigations; Litigation. As of the Escrow Date, (a) there is no investigation or review pending (or, to the knowledge of Parent, threatened) by any Governmental Entity with respect to Parent or any of its Subsidiaries which would reasonably be expected to have, individually or in the aggregate, a Parent Material Adverse Effect; and (b) there are no actions, suits, inquiries, investigations or proceedings pending (or, to Parent’s knowledge, threatened) against or affecting Parent or its Subsidiaries, or any of their respective properties at law or in equity before, and, as of the Escrow Date, there are no orders, judgments or decrees of or before any Governmental Entity, in each case, which would reasonably be expected to have, individually or in the aggregate, a Parent Material Adverse Effect.

      Section 4.5     Proxy Statement; Other Information. None of the information with respect to Parent or its Subsidiaries to be included in the Proxy Statement will, at the time of the mailing of the Proxy Statement or any amendments or supplements thereto, and at the time of the Company Meeting, contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary in order to make the statements therein, in light of the circumstances under which they were made, not misleading.

      Section 4.6     Available Funds.

      (a) Section 4.6 of the Parent Disclosure Schedule sets forth true, accurate and complete copies of (i) the commitment letter and related term sheets accepted, agreed and executed by the Majority Parent Shareholder and Parent, whereby the Majority Parent Shareholder commits, subject to the terms and

conditions thereof, to provide to Parent a subordinated funding security in an aggregate principal amount of up to US$4,500,000,000 and a subordinated bridge security in an aggregate principal amount of US$2,500,000,000 to finance the transactions contemplated by this Agreement (the “Subordinated Funding Commitment Letter”), (ii) the commitment letter and related term sheets accepted, agreed and executed by Goldman Sachs Credit Partners L.P. (“GSCP”), JPMorgan Chase Bank, N.A. (“JPMorgan Bank”), J.P. Morgan Securities (Asia Pacific) Limited (“JPM Securities”) and Parent, whereby GSCP and JPMorgan Bank commit, subject to the terms and conditions thereof, to provide to Parent an acquisition financing bridge facility in an aggregate principal amount of US$3,000,000,000 to finance the transactions contemplated by this Agreement (the “GS/ JPM Bridge Facility Commitment Letter”), and (iii) the commitment letter and related term sheets accepted, agreed and executed by The Industrial and Commercial Bank of China (“ICBC”) and Parent whereby ICBC commits, subject to the terms and conditions thereof, to provide to Parent an acquisition financing bridge facility in an aggregate principal amount of US$6,000,000,000 to finance the transactions contemplated by this Agreement (the “ICBC Bridge Facility Commitment Letter” and, together with the Subordinated Funding Commitment Letter and the GS/ JPM Bridge Facility Commitment Letter, the “Financing Commitments,” the financing under the GS/ JPM Bridge Facility Commitment Letter and the ICBC Bridge Facility Commitment Letter being referred to as the “Debt Financing” and, together with the financing under the Subordinated Funding Commitment Letter, the “Financing”). The Financing Commitments are in full force and effect and have not been withdrawn or terminated or otherwise amended or modified in any respect and neither Parent nor Merger Sub is in breach of any of the conditions set forth therein. The proceeds from such Financing, together with cash on hand and available lines of credit, constitute all of the financing required to be provided by Parent for the consummation of the transactions contemplated hereby, and are sufficient for the satisfaction of all of Parent’s and Merger Sub’s obligations under this Agreement, including the payment of the Merger Consideration, the Option and Stock-Based Consideration and the Make-Whole Amounts. The Debt Commitment Letters contain all of the conditions precedent to the obligations of the lenders thereunder to make the Debt Financing available to Parent on the terms therein, and the Subordinated Debt Commitment Letters contain all of the conditions precedent to the obligations of the Majority Parent Shareholder to make the subordinated debt financing thereunder available to Parent on the terms therein. Assuming satisfaction of the condition set forth in Section 6.3(a), no event has occurred which, with or without notice, lapse of time or both, would reasonably be expected to constitute a breach or failure to satisfy a condition precedent on the part of Parent under the Financing Commitments that has not been waived or remedied to the satisfaction of the parties thereto. Parent has fully paid any and all commitment fees or other fees on the dates and to the extent required by the Financing Commitments. There are no other agreements, written or oral, with respect to the Financing that contain any condition to any party’s obligations in respect of the Financing other than the Financing Commitments.

      (b) The financing committed to be provided to Parent pursuant to the Subordinated Debt Financing Letters falls under the exemption contained in Listing Rule 14A.65(4) of the HKEx Listing Rules.

      Section 4.7     Finders or Brokers. Neither Parent nor any of its Subsidiaries has employed any investment banker, broker or finder in connection with the transactions contemplated by this Agreement who might be entitled to any fee or any commission in connection with or upon consummation of the Merger payable by the Company or any of its Subsidiaries.

      Section 4.8     Capitalization and No Activities of Merger Sub. As of the Escrow Date, the authorized capital stock of Merger Sub consists of 1,000 shares of common stock, par value $0.01 per share, all of which are validly issued and outstanding. All of the issued and outstanding capital stock of Merger Sub is, and at the Effective Time will be, owned by Parent or a direct or indirect wholly-owned Subsidiary of Parent. Merger Sub has outstanding no option, warrant or any other agreement pursuant to which any person other than Parent may acquire any equity security of Merger Sub. Merger Sub has not conducted any business prior to the Escrow Date and has no, and prior to the Effective Time will have no, assets, liabilities or obligations of any nature other than those incident to its formation and pursuant to this Agreement and the Merger and the other transactions contemplated by this Agreement.

      Section 4.9     Lack of Ownership of Company Common Stock. Neither Parent nor any of its Subsidiaries owns, directly or indirectly, any Shares or other securities convertible into, exchangeable into or exercisable for Shares.

      Section 4.10     No Withholding Tax. No withholding Tax will be imposed by any Relevant Jurisdiction on the Merger Consideration or the Option and Stock-Based Consideration (i) except to the extent that a holder is subject to such withholding or deduction as a result of being or having been resident for Tax purposes in, or having or having had a taxable presence (other than solely by reason of receiving the consideration otherwise payable under this Agreement) in, any Relevant Jurisdiction, and (ii) except, in the case of Option and Stock-Based Consideration, for withholding Tax on compensation income of service providers that are performing or have performed services in any Relevant Jurisdiction.

      Section 4.11     PRC Government Approvals. Parent and Merger Sub have received or will receive all approvals under the Laws of each Relevant Jurisdiction (as defined herein). “Relevant Jurisdiction” means the People’s Republic of China and Hong Kong and all relevant Governmental Entities located therein.

ARTICLE V

Covenants and Agreements

      Section 5.1     Conduct of Business by the Company. From and after the date hereof and prior to the Effective Time or the date, if any, on which this Agreement is earlier terminated pursuant to Section 7.1 (the “Termination Date”), and except (i) as may be required by Law (provided that any party availing itself of such exception must first consult with the other party), (ii) as may be agreed in advance in writing by Parent (which consent shall not be unreasonably withheld, delayed or conditioned), (iii) as may be expressly permitted by this Agreement or (iv) as set forth in Section 5.1 of the Company Disclosure Schedule, the Company covenants and agrees with Parent that the business of the Company and its Subsidiaries shall be conducted only in, and such entities shall not take any action except in the ordinary course of business consistent with past practices; and the Company for itself and on behalf of its Subsidiaries agrees with Parent to use its commercially reasonable efforts to (x) preserve substantially intact their business organizations and goodwill, (y) keep available the services of those of their present officers, employees and consultants who are integral to the operation of their businesses as presently conducted and (z) preserve their present relationships with significant customers and suppliers and with other persons with whom they have significant business relations; provided, however, that no action by the Company or its Subsidiaries with respect to matters specifically addressed by any other provision of this Section 5.1 shall be deemed a breach of this sentence unless such action would constitute a breach of such other provision. Without limiting the generality of the foregoing, the Company agrees with Parent, on behalf of itself and its Subsidiaries, that between the date hereof and the Effective Time, without the prior written consent of Parent, the Company:

provided, however, that nothing in this Agreement shall prevent the Company from, in its sole discretion, (x) negotiating and entering into production period extensions relating to the Company’s concessions in Thailand as well as related marketing arrangements or (y) negotiating, approving, submitting for partner and governmental approvals and entering into all commitments necessary to maintain the schedules for the Sadewa, Senturian, Gendalo and Gegem-Ranggas projects in Indonesia, provided, that in each case the Company shall do so on commercially reasonable terms in accordance with the Company’s customary approval practices and, with respect to any changes to the financial terms of such extensions and commitments, the Company will only make such changes in its good faith business judgment.

      Section 5.2     Investigation. The Company shall afford to Parent and to its officers, employees, accountants, consultants, legal counsel, financial advisors and agents and other representatives (collectively, “Representatives”) reasonable access during normal business hours, throughout the period prior to the earlier of the Effective Time and the Termination Date, to its and its Subsidiaries’ properties, contracts, commitments, books and records and any report, schedule or other document filed or received by it pursuant to the requirements of applicable Laws and shall use all reasonable efforts to cause its Representatives to furnish promptly to Parent such additional financial and operating data and other information as to its and its Subsidiaries’ respective businesses and properties as Parent or its Representatives may from time to time reasonably request, except that nothing herein shall require the Company or any of its Subsidiaries to disclose any information to Parent that would cause a violation of any agreement to which the Company or any of its Subsidiaries is a party, would cause a risk of a loss of privilege to the Company or any of its Subsidiaries, or would constitute a violation of applicable Laws. Parent hereby agrees that it shall treat any such information in accordance with the Confidentiality Agreement dated as of February 18, 2005 between the Company and Parent (the “Confidentiality Agreement”). Subject to the exception in the first sentence of this section and to the immediately preceding sentence, the Company agrees to confer at such times as Parent may reasonably request with one or more directors, officers, employees or agents of Parent, to report material operational matters and the general status of its ongoing operations. Notwithstanding any provision of this Agreement to the contrary, the Company shall not be obligated to make any disclosure in violation of applicable Laws.

      Section 5.3     No Solicitation.

      (a) The Company agrees that neither it nor any Subsidiary of the Company shall, and that it shall use its reasonable best efforts to cause its and their respective Representatives not to, directly or indirectly: (i) solicit, initiate or knowingly facilitate, encourage or induce any inquiry with respect to, or the making, submission or announcement of, any Company Alternative Proposal or any bona fide oral expression of intent with respect thereto, (ii) participate in any negotiations regarding, or furnish any nonpublic information with respect to the Company, any of its Subsidiaries or any of their respective affiliates or afford access to the business, properties,

assets, books or records of the Company, any of its subsidiaries or any of their respective affiliates to any third party (or any of its representatives or advisors) who has made or disclosed to the Company or publicly an intention to make any Company Alternative Proposal or made to the Company any bona fide oral expression of intent with respect thereto, or in response to any inquiries or proposals that the Company reasonably expects to lead to any Company Alternative Proposal or any bona fide oral expression of intent with respect thereto, (iii) engage in discussions with respect to a possible Company Alternative Proposal with any person that has made or disclosed to the Company or publicly an intent to make a Company Alternative Proposal or made to the Company any bona fide oral expression of intent with respect thereto, except to notify such person as to the existence of the provisions of this Section 5.3, (iv) withdraw or modify in a manner adverse to Parent the Company Recommendation (as defined in Section 5.4(b)) (or recommend any Company Alternative Proposal) (any action described in this clause (iv) being referred to as a “Company Change of Recommendation”), (v) grant any waiver or release under any standstill or similar agreement with respect to any class of equity securities of the Company or any of its Subsidiaries or (vi) enter into any letter of intent or similar document or any agreement or commitment providing for any Company Alternative Proposal (except for confidentiality agreements permitted under Section 5.3(b)).

      (b) Notwithstanding the limitations set forth in Section 5.3(a), if the Company receives a Company Alternative Proposal (i) which constitutes a Company Superior Proposal or (ii) which the Board of Directors of the Company determines in good faith after consultation with the Company’s outside legal and financial advisors is reasonably likely to result, after the taking of any of the actions referred to in either of clause (x) or (y) below, in a Company Superior Proposal, the Company may, directly or indirectly through advisors, agents or other intermediaries, prior to the receipt of the Company Stockholder Approval and subject to it having complied with Section 5.3(a) prior thereto and subject to compliance with Section 5.3(e) below, take the following actions: (x) furnish nonpublic information to the third party and its Representatives making such Company Alternative Proposal, if, and only if, prior to so furnishing such information, the Company receives from the third party an executed confidentiality agreement with terms no less favorable to the Company with respect to confidentiality than the terms of the Confidentiality Agreement and (y) engage in discussions or negotiations with the third party and its Representatives with respect to the Company Alternative Proposal.

      (c) In response to the receipt of a Company Superior Proposal that has not been withdrawn, the Board of Directors of the Company may, prior to the receipt of the Company Stockholder Approval and subject to it having complied with Section 5.3(a) prior thereto and subject to compliance with Section 5.3(e) below, make a Company Change of Recommendation if the Board of Directors of the Company has concluded in good faith after consultation with the Company’s outside legal and financial advisors that the failure of the Board of Directors to effect a Company Change of Recommendation would be reasonably likely to be inconsistent with the directors’ exercise of their fiduciary obligations to the Company’s stockholders under applicable Law. No Company Change of Recommendation shall change the approval of the Board of Directors of the Company for purposes of causing Article 7 of the Company’s certificate of incorporation, any state takeover Law (including the Interested Stockholder Statute) or other state Law to be inapplicable to the Merger and the other transactions contemplated by this Agreement.

      (d) Nothing in this Agreement shall prohibit the Board, in circumstances not involving a Company Alternative Proposal, from making a Company Change of Recommendation prior to the receipt of the Company Stockholder Approval, if the Board determines in good faith (after consultation with outside legal counsel) that failure to take such action would be inconsistent with the directors’ exercise of their fiduciary obligations to the Company’s stockholders under applicable Law.

      (e) The Company shall notify Parent promptly (but in no event later than 24 hours) after receipt by the Company (or any of its advisors) of any Company Alternative Proposal, any indication of which the Company has knowledge that a third party is considering making a Company Alternative Proposal or of any request for nonpublic information relating to the Company, any of its Subsidiaries or any of their respective affiliates or for access to the business, properties, assets, books or records of the Company, any of its Subsidiaries or any of their respective affiliates by any third party that the Company has knowledge may be considering making, or has made, a Company Alternative Proposal. The Company shall provide that notice orally and in writing and shall identify the third party making, and the price and other material terms and conditions of, any such

Company Alternative Proposal, indication or request. The Company shall keep Parent reasonably informed, on a reasonably current basis, of the status and material terms of any such Company Alternative Proposal, indication or request. The Company shall, and shall cause its Subsidiaries and the advisors, employees and other agents of the Company and any of its Subsidiaries to, cease immediately and cause to be terminated any and all existing activities, discussions or negotiations, if any, with any third party conducted prior to the date of this Agreement with respect to any Company Alternative Proposal and shall promptly request that such party (or its agents or advisors) return or destroy the confidential information about the Company that was furnished by or on behalf of the Company or any of its Subsidiaries (including any material containing or derived from such confidential information), and to provide the Company with written confirmation of compliance with such request.

      (f) Nothing contained in this Agreement shall prohibit the Company or its Board of Directors from disclosing to its stockholders a position contemplated by Rules 14d-9 and 14e-2(a) promulgated under the Exchange Act, or from making any other disclosure, if, in the good faith judgment of the Company’s Board of Directors, after consultation with its outside legal and financial advisors, failure so to disclose would be inconsistent with the directors’ exercise of their fiduciary obligations to the Company’s stockholders, or is otherwise required, under applicable Law, provided, however, that the fact that a disclosure is permitted by this Section 5.1(f) does not in and of itself preclude that disclosure from constituting a Company Change in Recommendation.

      (g) As used in this Agreement, “Company Alternative Proposal” shall mean any bona fide written proposal, offer or bona fide written indication of interest, made by any person prior to the receipt of the Company Stockholder Approval (other than a proposal or offer by Parent or any of its Subsidiaries) for (i) any direct or indirect acquisition or purchase of 20% or more of the consolidated assets of the Company and its Subsidiaries or 50% or more of any class of equity or voting securities of the Company or any of its Subsidiaries whose assets, individually or in the aggregate, constitute 20% or more of the consolidated assets of the Company and its Subsidiaries, (ii) any tender offer (including a self-tender offer) or exchange offer that, if consummated, would result in a third party’s beneficially owning 20% or more of any class of equity or voting securities of the Company or 50% or more of any class of equity or voting securities of any of its Subsidiaries whose assets, individually or in the aggregate, constitute 20% or more of the consolidated assets of the Company and its Subsidiaries, or (iii) any merger, consolidation, share exchange, business combination, sale of substantially all the assets, reorganization, recapitalization, liquidation, dissolution or other similar transaction involving the Company or any of its Subsidiaries whose assets, in the aggregate constitute 20% or more of the consolidated assets of the Company and its Subsidiaries, in each case other than the transactions contemplated by this Agreement.

      (h) As used in this Agreement, “Company Superior Proposal” shall mean an unsolicited, written Company Alternative Proposal for or in respect of at least a majority of the outstanding shares of Company Common Stock or all or substantially all of the Company and its Subsidiaries’ assets made by any person on terms that the Board of Directors of the Company determines in good faith, after consultation with the Company’s outside financial and legal advisors, and after considering all the terms and conditions of the Company Alternative Proposal, including any break-up fees, expense reimbursement provisions and conditions to consummation, is reasonably likely to be consummated and is more favorable to the Company’s stockholders than the Merger (or any subsequent offer made by Parent in response to any such Company Alternative Proposal).

      Section 5.4     Securities Law Filings; Other Actions.

      (a) The Company shall prepare and file with the SEC the Proxy Statement, which shall, except to the extent provided in Section 5.3, include the Company Recommendation, and shall use all reasonable efforts to respond to any comments by the SEC staff in respect of the Proxy Statement.

      (b) Subject to the other provisions of this Agreement, the Company shall take all action necessary in accordance with the DGCL and its restated certificate of incorporation and by-laws to duly call, give notice of, convene and hold a meeting of its stockholders as promptly as reasonably practicable, for the purpose of obtaining the Company Stockholder Approval (the “Company Meeting”) and, subject to Section 5.3, shall,

through its Board of Directors, recommend to its stockholders the approval and adoption of this Agreement, the Merger and the other transactions contemplated hereby (the “Company Recommendation”). Subject to Section 5.3 of this Agreement, the Company will use all reasonable efforts to solicit from its stockholders proxies in favor of the adoption and approval of this Agreement and the approval of the Merger.

      (c) Parent shall take all actions in accordance with applicable Law, its Memorandum and Articles of Association and the rules of the HKEx to (i) cause an extraordinary general meeting of the shareholders of Parent (the “Parent Shareholder Meeting”) to be duly called and held for the purposes of obtaining the Parent Shareholder Approval as soon as reasonably practicable, (ii) ensure that the Parent Resolutions are duly put to Parent shareholders at the Parent Shareholder Meeting and (iii) ensure that the Parent Shareholder Meeting shall not be adjourned without a valid vote on all the Parent Resolutions having been duly completed. Parent shall recommend to all Parent shareholders that they vote in favor of all the Relevant Resolutions, and shall ensure that such recommendation is duly set out in the Parent Circular.

      (d) As soon as practicable following the date hereof, Parent shall release an announcement in Hong Kong by or on behalf of the parties stated therein, setting out the terms on which Parent has agreed to undertake the Merger and any other information required by Law to be included in such announcement (the “Announcement”). Parent shall deliver a copy of the Announcement to the Company as soon as practicable after it has been released.

      (e) Parent shall promptly prepare the Parent Circular in compliance with all applicable requirements, including the HKEx Listing Rules, and shall include a notice convening the Parent Shareholder Meeting.

      (f) Parent and its counsel (in the case of the Proxy Statement) or the Company and its counsel (in the case of the Parent Disclosure Documents) shall be given a reasonable opportunity to review and comment on the Proxy Statement and each Parent Disclosure Document, as the case may be, in each case before any such document (or any amendment thereto) is filed with the relevant regulator (e.g., the SEC, the HKEx, etc.), and good faith consideration shall be given to any comments made by such party and its counsel. Each party shall provide the other party and its counsel with (i) any comments or other communications, whether written or oral, that such party or its counsel may receive from time to time from the relevant regulator or its staff with respect to the Proxy Statement and each Parent Disclosure Document promptly after receipt of those comments or other communications and (ii) a reasonable opportunity to provide comments on any proposed response to such comments or other communications (to which good faith consideration shall be given). None of the Company nor any of its directors or officers shall have, nor shall they be required to assume, any responsibility for any announcements or other documents issued or published by Parent for the purposes of, or in connection with, the Merger or any of the other transactions contemplated by this Agreement, except to the extent of any information furnished by or on behalf of the Company for inclusion therein.

      Section 5.5     Stock Options and Other Stock-Based Awards; Employee Matters.

      (a) Stock Options and Other Stock-Based Awards.

      (b) Employee Matters. Subject in all respects to Section 5.5(b)(viii) and Section 8.10,

      Section 5.6     Reasonable Best Efforts.

      (a) Subject to the terms and conditions set forth in this Agreement, each of the parties hereto shall use (and shall cause its Subsidiaries to use) its respective reasonable best efforts (subject to, and in accordance with, applicable Law) to take (or cause to be taken) promptly all actions, and to do promptly, or cause to be done, and to assist and cooperate with the other parties in doing, all things in each case necessary, proper or advisable under applicable Laws and regulations to consummate and make effective the Merger and the other transactions contemplated by this Agreement, including (i) using reasonable best efforts (A) to obtain all necessary actions or non-actions, waivers, consents and approvals, including the Company Approvals, from Governmental Entities, to make all necessary registrations and filings and to take all steps as may be necessary to obtain an approval or waiver from, or to avoid an action or proceeding by, any Governmental Entity, (B) to obtain all necessary consents, approvals or waivers from third parties, and (C) to defend any lawsuits or other legal proceedings, whether judicial or administrative, challenging this Agreement or the consummation of the transactions contemplated by this Agreement and (ii) executing and delivering any additional instruments necessary to consummate the transactions contemplated by this Agreement.

      (b) Subject to the terms and conditions herein provided and without limiting the foregoing, the Company and Parent shall:

      (c) In furtherance and not in limitation of the covenants of the parties contained in this Section 5.6, if any administrative or judicial action or proceeding, including any proceeding by a private party, is instituted (or threatened to be instituted) challenging any transaction contemplated by this Agreement as violative of any Regulatory Law (as defined below), each of the Company and Parent shall cooperate in all respects with each other and use its reasonable best efforts to contest and resist any such action or proceeding and to have vacated, lifted, reversed or overturned any decree, judgment, injunction or other order, whether temporary, preliminary or permanent, that is in effect and that prohibits, prevents or restricts consummation of the transactions contemplated by this Agreement. Notwithstanding the foregoing or any other provision of this Agreement, nothing in this Section 5.6 shall limit a party’s right to terminate this Agreement pursuant to Section 7.1(b) or 7.1(c) so long as such party has, prior to such termination, complied with its obligations under this Section 5.6.

      (d) Subject to the terms and conditions of this Agreement, if any objections are asserted with respect to the transactions contemplated hereby under any Regulatory Law or if any suit is instituted by any Governmental Entity or any private party challenging any of the transactions contemplated hereby as violative of any Regulatory Law, each of the Company and Parent shall use its reasonable best efforts to resolve any such objections or challenge as such Governmental Entity or private party may have to such transactions under such Regulatory Law so as to permit consummation of the transactions contemplated hereby. For purposes of this Agreement, “Regulatory Law” means the Sherman Act, as amended, the Clayton Act, as amended, the HSR Act, the Federal Trade Commission Act, as amended, Exon-Florio and all other federal, state or foreign statutes, rules, regulations, orders, decrees, administrative and judicial doctrines and other Laws, including without limitation any antitrust, competition or trade regulation laws, that are designed or intended to (i) prohibit, restrict or regulate actions having the purpose or effect of monopolization or restraint of trade or lessening competition through merger or acquisition or (ii) protect the national security or the national economy of any nation.

      (e) Notwithstanding anything to the contrary herein, and except as expressly required by this Agreement, Parent covenants and agrees that it shall not, and shall not permit any of its Subsidiaries to take or agree to take any action, or enter into or agree to enter into any definitive agreement for the acquisition of any business or person, that is reasonably likely to prevent or materially delay the consummation of the transactions contemplated hereby, including the Financing.

      (f) Notwithstanding anything to the contrary herein but subject to the fiduciary duties of the Company’s board of directors and except as expressly permitted by this Agreement, the Company covenants and agrees that it shall not, and shall not permit any of its Subsidiaries to take or agree to take any action, or enter into or agree to enter into any definitive agreement for the acquisition of any business or person, that is reasonably likely to prevent or materially delay the consummation of the transactions contemplated hereby.

      Section 5.7     Takeover Statute. If any “fair price,” “moratorium,” “control share acquisition” or other form of anti-takeover statute or regulation shall become applicable to the transactions contemplated hereby, each of the Company and Parent and the members of their respective Boards of Directors shall grant such approvals and take such actions as are reasonably necessary so that the transactions contemplated hereby may be consummated as promptly as practicable on the terms contemplated hereby and otherwise act to eliminate or minimize the effects of such statute or regulation on the transactions contemplated hereby.

      Section 5.8     Public Announcements. The Company and Parent will consult with and provide each other the opportunity to review and comment upon any press release or other public statement or comment prior to the issuance of such press release or other public statement or comment relating to this Agreement or

the transactions contemplated herein and shall not issue any such press release or other public statement or comment prior to such consultation, except as may be required by Law, the HKEx Listing Rules or by obligations pursuant to any listing agreement with any national securities exchange. Parent and the Company agree to issue the Announcement and one or more press releases announcing this Agreement in each case in the form(s) previously agreed by the parties.

      Section 5.9     Indemnification and Insurance.

      (a) Parent and Merger Sub agree that all rights to exculpation and indemnification for acts or omissions occurring at or prior to the Effective Time, whether asserted or claimed prior to, at or after the Effective Time (including any matters arising in connection with the transactions contemplated by this Agreement), now existing in favor of the current or former directors, officers or employees, as the case may be (the “Indemnified Parties”), of the Company or its Subsidiaries as provided in their respective certificates of incorporation or by-laws or in any agreement shall survive the Merger and shall continue in full force and effect. For a period of six (6) years from and after the Effective Time, Parent and Surviving Corporation shall (i) maintain in effect (A) the current provisions regarding indemnification of officers, directors and employees contained in the certificate of incorporation and by-laws (or comparable organizational documents) of each of the Company and its Subsidiaries and (B) any indemnification agreements of the Company and its Subsidiaries with any of their respective directors, officers and employees existing as on the date hereof, and (ii) each indemnify the current directors and officers to the fullest extent permitted by applicable Law for acts or omissions occurring on or before the Effective Time. For a period of six (6) years from and after the Effective Time, the Surviving Corporation shall either cause to be maintained in effect the current policies of directors’ and officers’ liability insurance and fiduciary liability insurance maintained by the Company or its Subsidiaries or provide substitute policies or purchase a “tail policy,” in either case, of at least the same coverage and amounts containing terms and conditions which are, in the aggregate, no less advantageous to the insureds (to the maximum extent commercially available) with respect to claims arising from facts or events that occurred on or before the Effective Time, except that in no event shall the Surviving Corporation be required to pay with respect to such insurance policies in respect of any one policy year more than 300% of the annual premium payable by the Company for such insurance for the year ending December 31, 2005 (the “Maximum Amount”), and if the Surviving Corporation is unable to obtain the insurance required by this Section 5.9 it shall obtain as much comparable insurance as possible for the years within such six-year period for an annual premium equal to the Maximum Amount, in respect of each policy year within such period.

      (b) The provisions of this Section 5.9 are intended to be for the benefit of, and shall be enforceable by, each of the Indemnified Parties and their heirs and legal representatives.

      (c) The rights of the Indemnified Parties and their heirs and legal representatives under this Section 5.9 shall be in addition to any rights such Indemnified Parties may have under the certificate of incorporation or by-laws of the Company or any of its Subsidiaries, any agreements between such persons and the Company or any of its Subsidiaries, or any applicable Laws.

      (d) In the event that either Parent or the Surviving Corporation or any of their respective successors or assigns (A) consolidates with or merges into any other persons, or (B) transfers 50% or more of its properties or assets to any person, then and in each case, proper provision shall be made so the applicable successors and assigns or transferees assume the obligations set forth in this Section 5.9.

      Section 5.10     Section 16 Matters. Prior to the Effective Time, Parent and the Company shall use all reasonable efforts to approve in advance in accordance with the procedures set forth in Rule 16b-3 promulgated under the Exchange Act, any dispositions of Company Common Stock (including derivative securities with respect to Company Common Stock) resulting from the transactions contemplated by this Agreement by each officer or director of the Company who is subject to Section 16 of the Exchange Act (or who will become subject to Section 16 of the Exchange Act as a result of the transactions contemplated hereby) with respect to equity securities of the Company.

      Section 5.11     Control of Operations. Without in any way limiting any party’s rights or obligations under this Agreement, the parties understand and agree that (i) nothing contained in this Agreement shall

give Parent, directly or indirectly, the right to control or direct the Company’s operations prior to the Effective Time, and (ii) prior to the Effective Time, the Company shall exercise, consistent with the terms and conditions of this Agreement, complete control and supervision over its operations.

      Section 5.12     Certain Transfer Taxes. Any liability arising out of any real estate transfer Tax with respect to interests in real property owned directly or indirectly by the Company or any of its Subsidiaries immediately prior to the Merger, if applicable and due with respect to the Merger, shall be borne by the Surviving Corporation or Parent and expressly shall not be a liability of stockholders of the Company.

      Section 5.13     Financing. Parent shall use its reasonable best efforts to obtain the Financing on the terms and conditions described in the Financing Commitments, including using its reasonable best efforts (i) to negotiate definitive agreements with respect thereto on the terms and conditions contained in the Financing Commitments and (ii) to satisfy all conditions applicable to Parent in such definitive agreements. In the event that any portion of the Financing becomes unavailable in the manner or from the sources contemplated in the Financing Commitments, Parent shall immediately notify the Company and shall use its reasonable best efforts to arrange any such portion from alternative sources.

      Section 5.14     Certain Notices. Each of the Company and Parent shall promptly notify the other of:

provided, however, that the delivery of any notice pursuant to this Section 5.14 shall not limit or otherwise affect the representations, warranties, covenants or agreements of the parties or the conditions to the obligations of the parties under this Agreement.

      Section 5.15     Certain Hedging Practices. From and after the date hereof and prior to the Effective Time or the End Date, the Company shall use reasonable best efforts to enter into and maintain, in the normal course of its business, Hedge Transactions with respect to the Company’s estimated oil and natural gas production for the volumes and time periods set forth in Section 5.15 of the Company Disclosure Schedule as soon as reasonably practicable. The Company shall keep Parent informed on a timely basis regarding the Company’s outstanding hedging positions and future hedging plans. At the written request of Parent, the Company shall use best efforts to enter into and maintain additional Hedge Transactions (“Additional Hedges”), provided, that, in no event shall the aggregate volume of all Hedge Transactions (including any Additional Hedges) exceed 90% of the Company’s aggregate oil and natural gas estimated production volumes from the Company’s oil and gas properties located in the lower 48 states of the United States. Notwithstanding the preceding sentence, Additional Hedges shall be entered into if and only if (i) Parent agrees to pay for any costs of such Additional Hedges and (ii) Parent and the Company enter into mutually satisfactory agreements at the time of such transactions that provide that the Company shall be indemnified and held harmless from and against, on an after-tax basis, any and all losses, liabilities and expenses, and that Parent shall be entitled to all proceeds, on an after-tax basis, actually received by the Company (net of all out-of-pocket expenses), in each case, attributable to, arising out of or resulting from any Additional Hedges. As used in this Agreement, the term “Hedge Transaction” means any derivative transaction, including any swap, option, warrant, forward purchase or sale, futures, cap, floor or collar transaction relating to one or more

commodities or related indices; provided that the derivative instrument governing such transaction is traded on the New York Mercantile Exchange (Nymex).

      Section 5.16     Continued Existence of Union Oil of California. For a period commencing on the Closing Date and ending on the fifth anniversary of the Closing Date, Parent shall (a) maintain the separate existence of Union Oil of California and (b) cause Union Oil of California to maintain a level of assets reasonably sufficient to satisfy its obligations under the benefit plans and programs relating to the Company’s U.S. employees.

      Section 5.17     Escrow Agreement.

      (a) Parent and the Escrow Agent have entered into the Escrow Agreement, and an amount equal to $2,500,000,000 (the “Initial Escrow Amount”) in cash or irrevocable letters of credit has been deposited with the Escrow Agent, such cash and/or letters of credit to be held in escrow pursuant to the terms and conditions set forth in the Escrow Agreement. The costs and expenses of establishing and maintaining the Initial Escrow Amount shall be borne equally by Parent and the Company, subject, in the case of the Company, to a cap of $10,000,000 on the annual amount of such costs and expenses, upon presentment of a reasonably detailed, written demand from Parent therefor.

      (b) On behalf of itself and its Subsidiaries, the Company hereby waives (in advance and without any further action) any right it has or may have to require Parent or Merger Sub to post an appeal or other similar bond in connection with any suit, action or proceeding relating to any Covered Claim (as such term is defined in the Escrow Agreement).

ARTICLE VI

Conditions to the Merger

      Section 6.1     Conditions to Each Party’s Obligation to Effect the Merger. The respective obligations of each party to effect the Merger shall be subject to the fulfillment (or waiver by all parties) at or prior to the Effective Time of the following conditions:

      Section 6.2     Conditions to Obligation of the Company to Effect the Merger. The obligation of the Company to effect the Merger is further subject to the fulfillment of the following conditions:

      Section 6.3     Conditions to Obligation of Parent to Effect the Merger. The obligation of Parent to effect the Merger is further subject to the fulfillment of the following conditions:

ARTICLE VII

Termination

      Section 7.1     Termination or Abandonment. Notwithstanding anything contained in this Agreement to the contrary, this Agreement may be terminated and abandoned at any time prior to the Effective Time:

      Section 7.2     Termination Fee.

      (a) Notwithstanding any provision in this Agreement to the contrary but subject to Section 7.2(c), if a Payment Event (as defined below) occurs, the Company shall pay Parent (by wire transfer of immediately available funds) the amounts set forth in this Section 7.2. As used in this Agreement, the term “Payment Event” shall mean the termination of this Agreement (i) by the Company or Parent pursuant to Section 7.1(g), (ii) by Parent pursuant to Section 7.1(f)(ii), or (iii) by the Company or Parent pursuant to

Section 7.1(d) if, in the case of clause (iii), on or before that termination, a Company Alternative Proposal shall have been publicly announced or proposed and not withdrawn.

      (b) For purposes of this Agreement, “Qualifying Event” shall mean any (i) merger or business combination transaction involving the Company; (ii) acquisition by any person (other than Parent or any of its Subsidiaries or affiliates) of fifty percent (50%) or more of the assets of the Company and its Subsidiaries, taken as a whole; (iii) acquisition by any person (other than Parent or any of its Subsidiaries or affiliates) of fifty percent (50%) or more of the outstanding Shares; (iv) any recapitalization, share repurchase, self-tender or similar transaction involving fifty percent (50%) or more of the outstanding Shares; or (v) any sale of all or substantially all of the assets of the Company and its Subsidiaries, taken as a whole.

      (c) Notwithstanding anything to the contrary herein, if a Payment Event shall have occurred, the Company shall pay to Parent the following amounts under the following circumstances:

Any payment pursuant to this Section 7.2 shall be reduced by any amounts required to be deducted or withheld therefrom under the Code or under any provision of state, local or foreign Tax Law. It is expressly understood that in no event shall the Company be required to pay the amounts referred to in this Article VII on more than one occasion.

      (d) (i) If this Agreement is terminated by Parent pursuant to Section 7.1(f)(i)(A) or 7.1(f)(ii), the Company shall, subject to clause (iii) of this Section 7.2(d), pay to Parent (by wire transfer of immediately available funds) an amount equal to the amounts paid by Parent to Chevron on the Company’s behalf which are referred to in the Recitals to this Agreement, on the first business day following such termination.

      (ii) If this Agreement is terminated by the Company or Parent pursuant to Section 7.1(d) under circumstances not constituting a Payment Event, the Company shall pay Parent (by wire transfer of immediately available funds) an amount in cash equal to $250,000,000, on the first business day following such termination; and if, following any such termination to which this clause (ii) shall apply, a definitive agreement providing for a Qualifying Event involving the Company and Chevron shall be executed, or a Qualifying Event involving the Company and Chevron shall be consummated, in either case, within twelve (12) months following such termination, the Company shall pay to Parent (by wire transfer of immediately available funds) an additional amount in cash equal to $250,000,000 on the day such agreement is entered into or such Qualifying Event is consummated (or, if such day is not a business day, the first business day thereafter).

      (iii) In no event shall the Company be obligated to make any payments under this Section 7.2(d) if it shall have made any payments under Section 7.2(c), and vice versa.

      (e) The Company acknowledges that the agreements contained in this Section 7.2 are an integral part of the transactions contemplated by this Agreement and that, without these agreements, Parent and Merger Sub would not enter into this Agreement. Accordingly, if the Company fails to pay promptly any amount due to

Parent pursuant to this Section 7.2, it shall also pay any costs and expenses incurred by Parent or Merger Sub in connection with a legal action to enforce this Agreement that results in a judgment against the Company for such amount.

      Section 7.3     Amendment or Supplement. At any time before or after approval of the matters presented in connection with the Merger by the stockholders of the Company and prior to the Effective Time, this Agreement may be amended or supplemented in writing by the Company and Parent with respect to any of the terms contained in this Agreement, except that, following the Company Stockholder Approval, there shall be no amendment or change to the provisions hereof which by Law or in accordance with the rules of any relevant stock exchange requires further approval by such stockholders without such further approval nor any amendment or change not permitted under applicable Law.

      Section 7.4     Extension of Time, Waiver, etc. At any time prior to the Effective Time, the Company and Parent may:

      Notwithstanding the foregoing, no failure or delay by the Company or Parent in exercising any right hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise of any other right hereunder. Any agreement on the part of a party hereto to any such extension or waiver shall be valid only if set forth in an instrument in writing signed on behalf of such party.

ARTICLE VIII

Miscellaneous

      Section 8.1     No Survival of Representations and Warranties. None of the representations and warranties in this Agreement or in any instrument delivered pursuant to this Agreement shall survive the Merger.

      Section 8.2     Expenses. Except as set forth in Sections 5.12 and 7.2, whether or not the Merger is consummated, all costs and expenses incurred in connection with the Merger, this Agreement and the transactions contemplated hereby shall be paid by the party incurring or required to incur such expenses, except that expenses incurred in connection with the printing, filing and mailing of the Proxy Statement (including applicable SEC filing fees) and the Parent Disclosure Documents and all fees paid in respect of HSR and any other required regulatory filing shall be borne by Parent.

      Section 8.3     Counterparts; Effectiveness. This Agreement may be executed in two or more consecutive counterparts (including by facsimile), each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument, and shall become effective when one or more counterparts have been signed by each of the parties and delivered (by telecopy or otherwise) to the other parties.

      Section 8.4     Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the State of Delaware, without giving effect to any choice or conflict of law provision or rule (whether of the State of Delaware or any other jurisdiction) that would cause the application of the laws of any jurisdiction other than the State of Delaware.

      Section 8.5     Jurisdiction; Enforcement; WAIVER OF JURY TRIAL.

      (a) (i) The parties agree that irreparable damage would occur in the event that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction or injunctions to prevent breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement, and that any action or

proceeding arising out of this Agreement shall be brought and determined exclusively in the Delaware Court of Chancery, or in the event (but only in the event) that such court does not have subject matter jurisdiction over such action or proceeding, in the United States District Court for the District of Delaware. If specific performance is not granted, the Company shall be entitled to recover all damages for breach by Parent as shall be suffered by the Company, as well as, in the case of a breach by Parent resulting in a failure to consummate the Merger, damages (“Stockholder Damages”) suffered by the Company’s stockholders arising out of such breach (less any amounts previously paid directly to stockholders by Parent in respect to that breach).

      (ii) If a Final Judgment (as defined in the Escrow Agreement) is entered by the Delaware Court of Chancery or the United States District Court for the District of Delaware:

      (iii) In addition, each of the parties hereto irrevocably agrees that any legal action or proceeding with respect to this Agreement and the rights and obligations arising hereunder, or for recognition and enforcement of any judgment in respect of this Agreement and the rights and obligations arising hereunder brought by the other party hereto or its successors or assigns shall be brought and determined exclusively in the Delaware Court of Chancery, or in the event (but only in the event) that such court does not have subject matter jurisdiction over such action or proceeding, in the United States District Court for the District of Delaware. Each of the parties hereto hereby irrevocably submits with regard to any such action or proceeding for itself and in respect of its property, generally and unconditionally, to the personal jurisdiction of the aforesaid courts and agrees that it will not bring any action relating to this Agreement or any of the transactions contemplated by this Agreement in any court or tribunal other than the aforesaid courts. Each of the parties hereto hereby irrevocably waives, and agrees not to assert, by way of motion, as a defense, counterclaim or otherwise, in any

action or proceeding with respect to this Agreement and the rights and obligations arising hereunder, or for recognition and enforcement of any judgment in respect of this Agreement and the rights and obligations arising hereunder (A) any claim that it is not personally subject to the jurisdiction of the above named courts for any reason other than the failure to serve process in accordance with this Section 8.5, (B) any claim that it or its property is exempt or immune from jurisdiction of any such court or from any legal process commenced in such courts (whether through service of notice, attachment prior to judgment, attachment in aid of execution of judgment, execution of judgment or otherwise) and (C) to the fullest extent permitted by the applicable law, any claim that (x) the suit, action or proceeding in such court is brought in an inconvenient forum, (y) the venue of such suit, action or proceeding is improper or (z) this Agreement, or the subject matter hereof, may not be enforced in or by such courts.

      (b) EACH OF PARENT AND MERGER SUB HEREBY IRREVOCABLY DESIGNATES THE CORPORATION TRUST COMPANY (IN SUCH CAPACITY, THE “PROCESS AGENT”), WITH AN OFFICE AT 1209 ORANGE STREET, CITY OF WILMINGTON, COUNTY OF NEW CASTLE, DELAWARE 19801 AS ITS DESIGNEE, APPOINTEE AND AGENT TO RECEIVE, FOR AND ON ITS BEHALF SERVICE OF PROCESS IN SUCH JURISDICTION IN ANY LEGAL ACTION OR PROCEEDINGS WITH RESPECT TO THIS AGREEMENT OR ANY OTHER AGREEMENT EXECUTED IN CONNECTION WITH THIS AGREEMENT, AND SUCH SERVICE SHALL BE DEEMED COMPLETE UPON DELIVERY THEREOF TO THE PROCESS AGENT; PROVIDED THAT IN THE CASE OF ANY SUCH SERVICE UPON THE PROCESS AGENT, THE PARTY EFFECTING SUCH SERVICE SHALL ALSO DELIVER A COPY THEREOF TO EACH OF PARENT AND MERGER SUB IN THE MANNER PROVIDED IN SECTION 8.7 OF THIS AGREEMENT. EACH OF PARENT AND MERGER SUB SHALL TAKE ALL SUCH ACTION AS MAY BE NECESSARY TO CONTINUE SAID APPOINTMENT IN FULL FORCE AND EFFECT OR TO APPOINT ANOTHER AGENT SO THAT EACH OF PARENT AND MERGER SUB WILL AT ALL TIMES HAVE AN AGENT FOR SERVICE OF PROCESS FOR THE ABOVE PURPOSES IN WILMINGTON, DELAWARE. IN THE EVENT OF THE TRANSFER OF ALL OR SUBSTANTIALLY ALL OF THE ASSETS AND BUSINESS OF THE PROCESS AGENT TO ANY OTHER ENTITY BY CONSOLIDATION, MERGER, SALE OF ASSETS OR OTHERWISE, SUCH OTHER ENTITY SHALL BE SUBSTITUTED HEREUNDER FOR THE PROCESS AGENT WITH THE SAME EFFECT AS IF NAMED HEREIN IN PLACE OF THE CORPORATION TRUST COMPANY. NOTHING HEREIN SHALL AFFECT THE RIGHT OF ANY PARTY TO SERVE PROCESS IN ANY MANNER PERMITTED BY APPLICABLE LAW. EACH OF PARENT AND MERGER SUB EXPRESSLY ACKNOWLEDGES THAT THE FOREGOING WAIVER IS INTENDED TO BE IRREVOCABLE UNDER THE LAWS OF THE STATE OF DELAWARE AND OF THE UNITED STATES OF AMERICA.

      (c) EACH OF THE PARTIES HERETO HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY.

      Section 8.6     Waiver of Immunity. Parent agrees that, to the extent that it or any of its Subsidiaries or any of its property or the property of its Subsidiaries is or becomes entitled to any immunity on the grounds of sovereignty or otherwise based upon its status as an agency or instrumentality of any government from any legal action, suit or proceeding or from set off or counterclaim relating to this Agreement from the jurisdiction of any competent court, from service of process, from attachment prior to judgment, from attachment in aid of execution, from execution pursuant to a judgment or an arbitral award or from any other legal process in any jurisdiction, it, for itself and its property, and for each of its Subsidiaries and its property, expressly, irrevocably and unconditionally waives, and agrees not to plead or claim, any such immunity with respect to matters arising with respect to this Agreement or the subject matter hereof (including any obligation for the payment of money). Parent agrees that the foregoing waiver is irrevocable and is not subject to withdrawal in any jurisdiction or under any statute, including the Foreign Sovereign Immunities Act, 28 U.S.C. § 1602 et seq. The foregoing waiver shall constitute a present waiver of immunity at any time any action is initiated against Parent or any of its Subsidiaries with respect to this Agreement or the subject matter hereof (including any

obligation for the payment of money). The term “immunity” as used herein includes immunity from jurisdiction, immunity from enforcement of an arbitral award or court judgment or any other type of immunity.

      Section 8.7     Notices. Any notice required to be given hereunder shall be sufficient if in writing, and sent by facsimile transmission (provided that any notice received by facsimile transmission or otherwise at the addressee’s location on any business day after 5:00 p.m. (addressee’s local time) shall be deemed to have been received at 9:00 a.m. (addressee’s local time) on the next business day in the place of receipt), by reliable overnight delivery service (with proof of service), hand delivery or certified or registered mail (return receipt requested and first-class postage prepaid), addressed as follows:

      To Parent or Merger Sub:

      with copies to:

      To the Company:

      with copies to:

or to such other address as any party shall specify by written notice so given, and such notice shall be deemed to have been delivered as of the date so telecommunicated, personally delivered or mailed. Any party to this Agreement may notify any other party of any changes to the address or any of the other details specified in this paragraph; provided that such notification shall only be effective on the date specified in such notice or five (5) business days after the notice is given, whichever is later. Rejection or other refusal to accept or the inability to deliver because of changed address of which no notice was given shall be deemed to be receipt of the notice as of the date of such rejection, refusal or inability to deliver.

      Section 8.8     Assignment; Binding Effect. Neither this Agreement nor any of the rights, interests or obligations hereunder shall be assigned by any of the parties hereto (whether by operation of law or otherwise) without the prior written consent of the other parties. Subject to the preceding sentence, this Agreement shall be binding upon and shall inure to the benefit of the parties hereto and their respective successors and assigns.

      Section 8.9     Severability. Any term or provision of this Agreement which is invalid or unenforceable in any jurisdiction shall, as to that jurisdiction, be ineffective to the extent of such invalidity or unenforceability without rendering invalid or unenforceable the remaining terms and provisions of this Agreement in any other jurisdiction. If any provision of this Agreement is so broad as to be unenforceable, such provision shall be interpreted to be only so broad as is enforceable.

      Section 8.10     Entire Agreement; No Third-Party Beneficiaries. This Agreement (including the exhibits and schedules hereto) and the Confidentiality Agreement constitute the entire agreement, and supersede all other prior agreements and understandings, both written and oral, between the parties, or any of them, with respect to the subject matter hereof and thereof and except for the provisions of Section 2.2(b)(iii), Section 5.9 and Section 5.12 hereof, is not intended to and shall not confer upon any person other than the parties hereto any rights or remedies hereunder. Notwithstanding anything herein that may be deemed to be to the contrary, the agreements contained in Section 5.5 and Section 5.16 will not and will not be deemed to preclude Parent from selling the Company or any of its Subsidiaries, or any of their respective assets, properties or businesses, in whole or in part, on the terms and conditions mutually agreed by Parent, the Company and the buyer(s) in any such sale(s).

      Section 8.11     Headings. Headings of the Articles and Sections of this Agreement are for convenience of the parties only, and shall be given no substantive or interpretive effect whatsoever.

      Section 8.12     Interpretation. When a reference is made in this Agreement to an Article or Section, such reference shall be to an Article or Section of this Agreement unless otherwise indicated. The table of contents to this Agreement is for reference purposes only and shall not affect in any way the meaning or interpretation of this Agreement. Whenever the words “include,” “includes” or “including” are used in this Agreement, they shall be deemed to be followed by the words “without limitation.” The words “hereof,” “herein” and “hereunder” and words of similar import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement. All terms defined in this Agreement shall have the defined meanings when used in any certificate or other document made or delivered pursuant thereto unless otherwise defined therein. The definitions contained in this Agreement are applicable to the singular as well as the plural forms of such terms and to the masculine as well as to the feminine and neuter genders of such term. Any agreement, instrument or statute defined or referred to herein or in any agreement or instrument that is referred to herein means such agreement, instrument or statute as from time to time amended, modified or supplemented, including (in the case of agreements or instruments) by waiver or consent and (in the case of statutes) by succession of comparable successor statutes and references to all attachments thereto and instruments incorporated therein. References to a person are also to its permitted successors and assigns. Each of the parties has participated in the drafting and negotiation of this Agreement. If an ambiguity or question of intent or interpretation arises, this Agreement must be construed as if it is drafted by all the parties and no presumption or burden of proof shall arise favoring or disfavoring any party by virtue of authorship of any of the provisions of this Agreement.

      Section 8.13     Definitions.

      (a) References in this Agreement to “Subsidiaries” of any party shall mean any corporation, partnership, association, trust or other form of legal entity of which (i) more than 50% of the outstanding voting securities are on the date hereof directly or indirectly owned by such party, or (ii) such party or any Subsidiary of such party is a general partner (excluding partnerships in which such party or any Subsidiary of such party does not have a majority of the voting interests in such partnership). References in this Agreement (except as specifically otherwise defined) to “affiliates” shall mean, as to any person, any other person which, directly or indirectly, controls, or is controlled by, or is under common control with, such person. As used in this definition, “control” (including, with its correlative meanings, “controlled by” and “under common control with”) shall mean the possession, directly or indirectly, of the power to direct or cause the direction of

management or policies of a person, whether through the ownership of securities or partnership or other ownership interests, by contract or otherwise. References in this Agreement to “person” shall mean an individual, a corporation, a partnership, a limited liability company, an association, a trust or any other entity, group (as such term is used in Section 13 of the Exchange Act) or organization, including, without limitation, a Governmental Entity. As used in this Agreement, “knowledge” of any person means the actual knowledge of the executive officers of such person. As used in this Agreement, “business day” means any day other than a Saturday, Sunday or a day on which the banks in New York are authorized by law or executive order to be closed. As used in this Agreement, “foreign” means jurisdictions other than the United States of America and the political subdivisions thereof. As used in this Agreement, “Hong Kong” means the Special Administrative Region of Hong Kong, and the “People’s Republic of China” means the People’s Republic of China and all political subdivisions thereof excluding Hong Kong. As used in this Agreement, “change in Law” means the enactment of any Law that did not exist on the Escrow Date, or the amendment, change or modification of any Law existing on the Escrow Date.

      (b) Each of the following terms is defined on the pages set forth opposite such term: