UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

Commission File Number 1-368-2

Chevron Corporation

(Exact name of registrant as specified in its charter)

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

NONE

(Former name or former address, if changed since last report.)

      Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes þ          No o

      Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Act. (Check one):

      Large accelerated filer þ          Accelerated filer o          Non-accelerated filer o

      Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes o          No þ

      Indicate the number of shares of each of the issuer’s classes of common stock, as of the latest practicable date:

INDEX

CAUTIONARY STATEMENT RELEVANT TO FORWARD-LOOKING INFORMATION

FOR THE PURPOSE OF “SAFE HARBOR” PROVISIONS OF THE

PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

      This quarterly report on Form 10-Q of Chevron Corporation contains forward-looking statements relating to Chevron’s operations that are based on management’s current expectations, estimates and projections about the petroleum, chemicals and other energy-related industries. Words such as “anticipates,” “expects,” “intends,” “plans,” “targets,” “projects,” “believes,” “seeks,” “schedules,” “estimates” and similar expressions are intended to identify such forward-looking statements. These statements are not guarantees of future performance and are subject to certain risks, uncertainties and other factors, some of which are beyond our control and are difficult to predict. Therefore, actual outcomes and results may differ materially from what is expressed or forecasted in such forward-looking statements. The reader should not place undue reliance on these forward-looking statements, which speak only as of the date of this report. Unless legally required, Chevron undertakes no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

      Among the important factors that could cause actual results to differ materially from those in the forward-looking statements are crude oil and natural gas prices; refining margins and marketing margins; chemicals prices and competitive conditions affecting supply and demand for aromatics, olefins and additives products; actions of competitors; the competitiveness of alternate energy sources or product substitutes; technological developments; the results of operations and financial condition of equity affiliates; inability or failure of the company’s joint-venture partners to fund their share of operations and development activities; potential failure to achieve expected net production from existing and future crude oil and natural gas development projects; potential delays in the development, construction or start-up of planned projects; potential disruption or interruption of the company’s net production or manufacturing facilities due to war, accidents, political events, civil unrest or severe weather; potential liability for remedial actions under existing or future environmental regulations and litigation; significant investment or product changes under existing or future environmental regulations and litigation (including, particularly, regulations and litigation dealing with gasoline composition and characteristics); potential liability resulting from pending or future litigation; the company’s acquisition or disposition of assets; the effects of changed accounting rules under generally accepted accounting principles promulgated by rule-setting bodies; and the factors set forth under the heading “Risk Factors” on pages 31 and 32 of the company’s Annual Report on Form 10-K. In addition, such statements could be affected by general domestic and international economic and political conditions. Unpredictable or unknown factors not discussed herein also could have material adverse effects on forward-looking statements.

PART I.

FINANCIAL INFORMATION

CHEVRON CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF INCOME

(Unaudited)

See accompanying notes to consolidated financial statements.

CHEVRON CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

(Unaudited)

See accompanying notes to consolidated financial statements.

CHEVRON CORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEET

(Unaudited)

See accompanying notes to consolidated financial statements.

CHEVRON CORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENT OF CASH FLOWS

(Unaudited)

See accompanying notes to consolidated financial statements.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

      The accompanying consolidated financial statements of Chevron Corporation and its subsidiaries (the company) have not been audited by independent accountants. In the opinion of the company’s management, the interim data include all adjustments necessary for a fair statement of the results for the interim periods. These adjustments were of a normal recurring nature, except for the items described in Note 2.

      Certain notes and other information have been condensed or omitted from the interim financial statements presented in this Quarterly Report on Form 10-Q. Therefore, these financial statements should be read in conjunction with the company’s 2005 Annual Report on Form 10-K.

      The results for the three-month period ended March 31, 2006 are not necessarily indicative of future financial results.

      On August 10, 2005, the company acquired Unocal Corporation, an independent oil and gas exploration and production company. Unocal’s principal upstream operations are in North America and Asia, including the Caspian region. Also located in Asia are Unocal’s geothermal energy and electrical power businesses. Other activities include ownership interests in proprietary and common carrier pipelines, natural gas storage facilities and mining operations.

      The aggregate purchase price of Unocal was $17.3 billion. A third-party appraisal firm was engaged to assist the company in the process of determining the fair values of Unocal’s tangible and intangible assets. The company expects this valuation process will be completed and the final appraisal report issued during the second quarter 2006. Upon completion of the final allocation of the purchase price and final determination of the tax bases for all assets and liabilities acquired, the calculation of the associated deferred income tax balances will also be completed.

      The acquisition was accounted for under the rules of Financial Accounting Standards Board (FASB) Statement No. 141, “Business Combinations.” The following table summarizes the preliminary allocation of the purchase price to Unocal’s assets and liabilities:

      The $4.7 billion of goodwill, which represents benefits of the acquisition that are additional to the fair values of the other net assets acquired, is assigned to the upstream segment. The goodwill is not deductible for tax purposes. The goodwill balance will be tested periodically for impairment according to the requirements of FASB Statement No. 142, “Goodwill and Other Intangible Assets.”

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      The “Net increase in operating working capital” was composed of the following operating changes:

      In accordance with the cash-flow classification requirements of FAS 123R, “Share-Based Payment,” the “Net increase in operating working capital” includes a reduction of $3 million for excess income tax benefits associated with stock options exercised during the first quarter 2006, which is offset by an equal amount in “Net purchases of treasury shares.” Refer to Note 9 beginning on page 14 for additional information related to the company’s adoption of FAS 123R, “Share-Based Payment.”

      “Net Cash Provided by Operating Activities” included the following cash payments for interest on debt and for income taxes:

      The “Net sales of marketable securities” consisted of the following gross amounts:

      The “Net purchases of treasury shares” represents the cost of common shares acquired in the open market less the cost of shares issued for share-based compensation plans. Open-market purchases totaled $1 billion and $0.7 billion in the 2006 and 2005 periods, respectively. Purchases in the 2006 first quarter were under the company’s stock repurchase program initiated in December 2005. The 2005 purchases related to a program that began in April 2004 and was completed in November 2005.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      The major components of “Capital expenditures” and the reconciliation of this amount to the capital and exploratory expenditures, including equity affiliates, presented in “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” are presented in the following table:

      Although each subsidiary of Chevron is responsible for its own affairs, Chevron Corporation manages its investments in these subsidiaries and their affiliates. For this purpose, the investments are grouped as follows: upstream, downstream, chemicals and all other. The first three of these groupings represent the company’s “reportable segments” and “operating segments” as defined in FAS 131, “Disclosures about Segments of an Enterprise and Related Information.”

      The segments are separately managed for investment purposes under a structure that includes “segment managers” who report to the company’s “chief operating decision maker” (CODM) (terms as defined in FAS 131). The CODM is the company’s Executive Committee, a committee of senior officers that includes the chief executive officer, and that in turn reports to the Board of Directors of Chevron Corporation.

      The operating segments represent components of the company as described in FAS 131 terms that engage in activities (a) from which revenues are earned and expenses are incurred; (b) whose operating results are regularly reviewed by the CODM, which makes decisions about resources to be allocated to the segments and to assess their performance; and (c) for which discrete financial information is available.

      Segment managers for the reportable segments are directly accountable to and maintain regular contact with the company’s CODM to discuss the segment’s operating activities and financial performance. The CODM approves annual capital and exploratory budgets at the reportable segment level, as well as reviews capital and exploratory funding for major projects and approves major changes to the annual capital and exploratory budgets. However, business-unit managers within the operating segments are directly responsible for decisions relating to project implementation and all other matters connected with daily operations. Company officers who are members of the Executive Committee also have individual management responsibilities and participate on other committees for purposes other than acting as the CODM.

      “All Other” activities include the company’s interest in Dynegy Inc. (Dynegy), mining operations of coal and other minerals, power generation businesses, worldwide cash management and debt financing activities, corporate administrative functions, insurance operations, real estate activities and technology companies.

      The company’s primary country of operation is the United States of America, its country of domicile. Other components of the company’s operations are reported as “International” (outside the United States).

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      Segment Earnings The company evaluates the performance of its operating segments on an after-tax basis, without considering the effects of debt financing interest expense or investment interest income, both of which are managed by the company on a worldwide basis. Corporate administrative costs and assets are not allocated to the operating segments. However, operating segments are billed for the direct use of corporate services. Nonbillable costs remain at the corporate level in “All Other.” Income by operating segment for the three-month periods ended March 31, 2006 and 2005, is presented in the following table:

Segment Income

      Segment Assets Segment assets do not include intercompany investments or intercompany receivables. “All Other” assets consist primarily of worldwide cash, cash equivalents and marketable securities, real estate, information systems, the company’s investment in Dynegy, mining operations of coal and other minerals,

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

power generation businesses, technology companies and assets of the corporate administrative functions. Segment assets at March 31, 2006, and December 31, 2005 follow:

Segment Assets

      Segment Sales and Other Operating Revenues Upstream segment revenues are derived primarily from the production and sale of crude oil and natural gas, as well as the sale of third-party production of natural gas. Revenues for the downstream segment are derived from the refining and marketing of petroleum products such as gasoline, jet fuel, gas oils, kerosene, lubricants, residual fuel oils and other products derived from crude oil. This segment also generates revenues from the transportation and trading of crude oil and refined products. Revenues for the chemicals segment are derived primarily from the manufacture and sale of additives for lubricants and fuels. “All Other” activities include revenues from mining operations of coal and other minerals, power generation businesses, insurance operations, real estate activities and technology companies.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      Operating-segment sales and other operating revenues, including internal transfers, for the three-month periods ended March 31, 2006 and 2005, are presented in the following table. Products are transferred between operating segments at internal product values that approximate market prices.

Sales and Other Operating Revenues

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      In connection with the Unocal acquisition, the company implemented a restructuring and reorganization program as part of the effort to capture the synergies of the combined companies. The program is expected to be substantially completed by the end of 2006 and is aimed at eliminating redundant operations, consolidating offices and facilities and sharing common services and functions.

      As part of the restructuring and reorganization, approximately 600 employee positions were identified for elimination. Most of the positions are in the United States and relate primarily to corporate and upstream executive and administrative functions. By the end of the first quarter 2006, approximately 350 of these employees had been terminated.

      In connection with this restructuring and reorganization, an accrual of $106 million was established as part of the purchase accounting for the Unocal acquisition. Activity in the first quarter 2006 for this accrual is shown in the table below. The balance at March 31, 2006, was classified as a current liability on the Consolidated Balance Sheet. Adjustments to the accrual may occur in future periods as the implementation plans are finalized and estimates are refined.

      Shown in the table below is the activity during the first quarter 2006 for the company’s liability related to various other reorganizations and restructurings across several businesses and corporate departments. The balance at March 31, 2006, was categorized as a current accrued liability on the Consolidated Balance Sheet.

Note 6. Summarized Financial Data — Chevron U.S.A. Inc.

      Chevron U.S.A. Inc. (CUSA) is a major subsidiary of Chevron Corporation. CUSA and its subsidiaries manage and operate most of Chevron’s U.S. businesses. Assets include those related to the exploration and production of crude oil, natural gas and natural gas liquids and those associated with refining, marketing, supply and distribution of products derived from petroleum, other than natural gas liquids, excluding most of the regulated pipeline operations of Chevron. CUSA also holds Chevron’s investments in the Chevron Phillips Chemical Company LLC (CPChem) joint venture and Dynegy, which are accounted for using the equity method.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      Chevron Transport Corporation Limited (CTC), incorporated in Bermuda, is an indirect, wholly owned subsidiary of Chevron Corporation. CTC is the principal operator of Chevron’s international tanker fleet and is engaged in the marine transportation of crude oil and refined petroleum products. Most of CTC’s shipping revenue is derived by providing transportation services to other Chevron companies. Chevron Corporation has guaranteed this subsidiary’s obligations in connection with certain debt securities issued by a third party. Summarized financial information for CTC and its consolidated subsidiaries is presented as follows:

      There were no restrictions on CTC’s ability to pay dividends or make loans or advances at March 31, 2006.

      Taxes on income for the first quarter 2006 were $3.6 billion, compared with $2.2 billion for the comparable period in 2005. The associated effective tax rates were 48 percent and 45 percent for 2006 and 2005, respectively. The primary reason for the higher rate in 2006 was that proportionally more income was earned in 2006 than in 2005 in countries with high tax rates.

      Effective July 1, 2005, the company adopted the provisions of Financial Accounting Standards Board (FASB) Statement No. 123R, “Share-Based Payment,”(FAS 123R) for its share-based compensation plans. The company previously accounted for these plans under the recognition and measurement principles of Accounting Principles Board (APB) Opinion No. 25, “Accounting for Stock Issued to Employees,”

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(APB 25) and related interpretations and disclosure requirements established by FAS 123, “Accounting for Stock-Based Compensation.”

      The company adopted FAS 123R using the modified prospective method and accordingly, results for prior periods were not restated. The following table illustrates the effect on net income and earnings per share as if the company had applied the fair-value recognition provisions of FAS 123 to stock options, stock appreciation rights, performance units and restricted stock units for periods prior to adoption of FAS 123R.

      In November 2005, the FASB issued a Staff Position FAS 123R-3 (FSP FAS 123R-3), “Transition Election Related to Accounting for the Tax Effects of Share-Based Payment Awards,” which provides a one-time transition election for companies to follow in calculating the beginning balance of the pool of excess tax benefits related to employee compensation and a simplified method to determine the subsequent impact on the pool of employee awards that are fully vested and outstanding upon the adoption of FAS 123R. Under the FSP, the company must decide by November 2006 whether to make this one-time transition election, which may provide some administrative relief in calculating the future tax effects of stock option issuances. Whether or not the one-time election is made, the company anticipates no significant difference in the amount of tax expense recorded in future periods.

      The company has defined-benefit pension plans for many employees. The company typically pre-funds defined-benefit plans as required by local regulations or in certain situations where pre-funding provides economic advantages. In the United States, this includes all qualified tax-exempt plans subject to the Employee Retirement Income Security Act (ERISA) minimum funding standard. The company does not typically fund domestic nonqualified tax-exempt pension plans that are not subject to funding requirements under laws and regulations because contributions to these pension plans may be less economic and investment returns may be less attractive than the company’s other investment alternatives.

      The company also sponsors other postretirement plans that provide medical and dental benefits, as well as life insurance for some active and qualifying retired employees. The plans are unfunded, and the company and the retirees share the costs. For retiree medical coverage in the company’s main U.S. plan, the increase to the company contributions is limited to no more than 4 percent each year, effective at retirement. Certain life insurance benefits are paid by the company and annual contributions are based on actual plan experience.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      The components of net periodic benefit costs for 2006 and 2005 were:

      At year end 2005, the company estimated it would contribute $300 million and $200 million to its U.S. and international pension plans, respectively, during 2006. Through March 31, 2006, a total of $104 million was contributed, including approximately $60 million to the U.S. plans. Estimated contributions for the full year continue to be $500 million, but actual contribution amounts are dependent upon investment returns, changes in pension obligations, regulatory environments and other economic factors. Additional funding may ultimately be required if investment returns are insufficient to offset increases in plan obligations.

      During the first quarter 2006, the company contributed $55 million to its other postretirement benefit plans. The company anticipates contributing an additional $165 million in 2006.

      The company accounts for the cost of exploratory wells in accordance with FASB Staff Position FAS 19-1, “Accounting for Suspended Well Costs,” which provides that an exploratory well continues to be capitalized after the completion of drilling if certain criteria are met. The company’s capitalized cost of

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

suspended wells at March 31, 2006, was approximately $1.2 billion, an increase of about $100 million from year-end 2005 due mainly to drilling activity in the United States. For the category of exploratory well costs at year-end 2005 that were suspended more than one year, a total of $20 million was expensed in the first quarter 2006.

      In the first quarter 2005, the Securities and Exchange Commission (SEC) issued comment letters to Chevron and other companies in the oil and gas industry requesting disclosure of information related to the accounting for buy/sell contracts. Under a buy/sell contract, a company agrees to buy a specific quantity and quality of a commodity to be delivered at a specific location while simultaneously agreeing to sell a specified quantity and quality of a commodity at a different location to the same counterparty. Physical delivery occurs for each side of the transaction, and the risk and reward of ownership are evidenced by title transfer, assumption of environmental risk, transportation scheduling, credit risk, and risk of nonperformance by the counterparty. Both parties settle each side of the buy/sell through separate invoicing.

      The company routinely enters into buy/sell contracts, primarily in the United States downstream business, associated with crude oil and refined products. For crude oil, these contracts are used to facilitate the company’s crude oil marketing activity, which includes the purchase and sale of crude oil production, fulfillment of the company’s supply arrangements as to physical delivery location and crude oil specifications, and purchase of crude oil to supply the company’s refining system. For refined products, buy/sell arrangements are used to help fulfill the company’s supply agreements to customer locations and specifications.

      The company has historically accounted for buy/sell transactions in the Consolidated Statement of Income the same as a monetary transaction — purchases are reported as “Purchased crude oil and products”; sales are reported as “Sales and other operating revenues.” The SEC raised the issue as to whether the accounting for buy/sell contracts should be shown net on the income statement and accounted for under the provisions of Accounting Principles Board (APB) Opinion No. 29, “Accounting for Nonmonetary Transactions” (APB 29). The company understands that others in the oil and gas industry may report buy/sell transactions on a net basis in the income statement rather than gross.

      The Emerging Issues Task Force (EITF) of the FASB began deliberating the topic as Issue No. 04-13, “Accounting for Purchases and Sales of Inventory with the Same Counterparty” (EITF 04-13). At its September 2005 meeting, the EITF reached consensus that two or more legally separate exchange transactions with the same counterparty, including buy/sell transactions, should be combined and considered as a single arrangement for purposes of applying APB 29, when the transactions were entered into “in contemplation” of one another. EITF 04-13 was ratified by the FASB in September 2005 and is effective for new arrangements, or modifications or renewals of existing arrangements, entered into on or after April 1, 2006, which is also the effective date for the company’s adoption of this standard. The company plans to report the net effect of all its buy/sell transactions, including transactions related to arrangements in effect on the implementation date, on its Consolidated Statement of Income as “Purchased crude oil and products” beginning in the second quarter 2006. Additionally, as the standard will be adopted prospectively, the company plans to continue to report the amount prior to second quarter 2006 for buy/sell contracts shown in “Sales and other operating revenues” as a footnote on the company’s Consolidated Statement of Income for comparative purposes.

      While the issue was under deliberation by the EITF, the SEC staff directed Chevron and other companies to disclose on the face of the income statement the amounts associated with buy/sell contracts and to discuss in a footnote to the financial statements the basis for the underlying accounting. The amounts for buy/sell contracts shown on the company’s Consolidated Statement of Income, “Sales and other operating revenues” for the three-month periods ending March 31, 2006 and 2005, included $6.7 billion and $5.4 billion, respectively. These revenue amounts associated with buy/sell contracts represented 13 percent of total “Sales and other operating revenues” in the 2006 and 2005 periods. Nearly all of these revenue amounts in each

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

period associated with buy/sell contracts pertain to the company’s downstream segment. The costs associated with these buy/sell revenue amounts are included in “Purchased crude oil and products” on the Consolidated Statement of Income in each period.

      Chevron and many other companies in the petroleum industry have used methyl tertiary butyl ether (MTBE) as a gasoline additive. Chevron is a party to more than 70 lawsuits and claims, the majority of which involve numerous other petroleum marketers and refiners, related to the use of MTBE in certain oxygenated gasolines and the alleged seepage of MTBE into groundwater. Resolution of these actions may ultimately require the company to correct or ameliorate the alleged effects on the environment of prior release of MTBE by the company or other parties. Additional lawsuits and claims related to the use of MTBE, including personal-injury claims, may be filed in the future.

      The company’s ultimate exposure related to these lawsuits and claims is not currently determinable, but could be material to net income in any one period. The company does not use MTBE in the manufacture of gasoline in the United States.

      Income Taxes The U.S. federal income tax liabilities have been settled through 1996 for Chevron Corporation (formerly ChevronTexaco Corporation) and 1997 for Chevron Global Energy Inc. (formerly Caltex Corporation), Unocal Corporation (Unocal), and Texaco Inc. (Texaco). California franchise tax liabilities have been settled through 1991 for Chevron, 1998 for Unocal and through 1987 for Texaco.

      Settlement of open tax years, as well as tax issues in other countries where the company conducts its businesses, is not expected to have a material effect on the consolidated financial position or liquidity of the company and, in the opinion of management, adequate provision has been made for income and franchise taxes for all years under examination or subject to future examination.

      Guarantees The company and its subsidiaries have certain other contingent liabilities with respect to guarantees, direct or indirect, of debt of affiliated companies or others and long-term unconditional purchase obligations and commitments, throughput agreements and take-or-pay agreements, some of which relate to suppliers’ financing arrangements. Under the terms of the guarantee arrangements, generally the company would be required to perform should the affiliated company or third party fail to fulfill its obligations under the arrangements. In some cases, the guarantee arrangements have recourse provisions that would enable the company to recover any payments made under the terms of the guarantees from assets provided as collateral.

      Off-Balance-Sheet Obligations The company and its subsidiaries have certain other contingent liabilities relating to long-term unconditional purchase obligations and commitments, throughput agreements, and take-or-pay agreements, some of which relate to suppliers’ financing arrangements. The agreements typically provide goods and services, such as pipeline and storage capacity, utilities, and petroleum products, to be used or sold in the ordinary course of the company’s business.

      Indemnifications The company provided certain indemnities of contingent liabilities of Equilon and Motiva to Shell Oil Company (Shell) and Saudi Refining Inc. in connection with the February 2002 sale of the company’s interests in those investments. The company would be required to perform if the indemnified liabilities become actual losses. Were that to occur, the company could be required to make maximum future payments up to $300 million. Through March 31, 2006, the company paid $38 million under these indemnities and expects to make additional indemnification payments in the future.

      The company has also provided indemnities relating to contingent environmental liabilities related to assets originally contributed by Texaco to the Equilon and Motiva joint ventures and environmental conditions that existed prior to the formation of Equilon and Motiva or that occurred during the period of Texaco’s ownership interests in the joint ventures. In general, the environmental conditions or events that are subject to

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

these indemnities must have arisen prior to December 2001. Claims relating to Equilon indemnities must be asserted either as early as February 2007, or no later than February 2009, and claims relating to Motiva must be asserted no later than February 2012. Under the terms of these indemnities, there is no maximum limit on the amount of potential future payments. The company has not recorded any liabilities for possible claims under these indemnities. The company posts no assets as collateral and has made no payments under these indemnities.

      The amounts payable for the indemnities described above are to be net of amounts recovered from insurance carriers and others and net of liabilities recorded by Equilon or Motiva prior to September 30, 2001, for any applicable incident.

      In the acquisition of Unocal, the company assumed certain indemnities relating to contingent environmental liabilities associated with assets of Unocal’s 76 Products Company business that existed prior to its sale in 1997. Under the terms of these indemnities, there is no maximum limit on the amount of potential future payments by the company; however, the purchaser shares certain costs under this indemnity up to an aggregate cap of $200 million. Claims relating to these indemnities must be asserted by April 2022. Through March 31, 2006, approximately $115 million had been applied to the cap, which includes payments made by either Unocal or Chevron totaling $83 million.

      Minority Interests The company has commitments of $213 million related to minority interests in subsidiary companies.

      Environmental The company is subject to loss contingencies pursuant to environmental laws and regulations that in the future may require the company to take action to correct or ameliorate the effects on the environment of prior release of chemical or petroleum substances, including MTBE, by the company or other parties. Such contingencies may exist for various sites, including, but not limited to, federal Superfund sites and analogous sites under state laws, refineries, crude oil fields, service stations, terminals, land development areas, and mining operations, whether operating, closed or divested. These future costs are not fully determinable due to such factors as the unknown magnitude of possible contamination, the unknown timing and extent of the corrective actions that may be required, the determination of the company’s liability in proportion to other responsible parties, and the extent to which such costs are recoverable from third parties.

      Although the company has provided for known environmental obligations that are probable and reasonably estimable, the amount of additional future costs may be material to results of operations in the period in which they are recognized. The company does not expect these costs will have a material effect on its consolidated financial position or liquidity. Also, the company does not believe its obligations to make such expenditures have had or will have any significant impact on the company’s competitive position relative to other U.S. or international petroleum or chemical companies.

      Global Operations Chevron and its affiliates conduct business activities in approximately 180 countries. Areas in which the company and its affiliates have significant operations or ownership interests include the United States, Canada, Australia, the United Kingdom, Norway, Denmark, France, the Netherlands, the Partitioned Neutral Zone between Kuwait and Saudi Arabia, Republic of the Congo, Angola, Nigeria, Chad, South Africa, Democratic Republic of the Congo, Indonesia, Bangladesh, the Philippines, Myanmar, Singapore, China, Thailand, Vietnam, Cambodia, Azerbaijan, Kazakhstan, Venezuela, Argentina, Brazil, Colombia, Trinidad and Tobago and South Korea. The company’s Caspian Pipeline Consortium (CPC) affiliate operates in Russia and Kazakhstan. The company’s Tengizchevroil (TCO) affiliate operates in Kazakhstan. Through an affiliate, the company participates in the development of the Baku-Tbilisi-Ceyhan (BTC) pipeline through Azerbaijan, Georgia and Turkey. Also through an affiliate, the company has an interest in the Chad/ Cameroon pipeline. The company’s Petrolera Ameriven affiliate operates the Hamaca project in Venezuela. The company’s Chevron Phillips Chemical Company LLC (CPChem) affiliate manufactures and markets a wide range of petrochemicals on a worldwide basis, with manufacturing facilities in the United States, Puerto Rico, Singapore, China, South Korea, Saudi Arabia, Qatar, Mexico and Belgium.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

      The company’s operations, particularly exploration and production, can be affected by changing economic, regulatory and political environments in the various countries in which it operates, including the United States. As has occurred in the past, actions could be taken by host governments to increase public or governmental ownership of the company’s partially or wholly owned businesses or assets or to impose additional taxes or royalties on the company’s operations or both.

      In certain locations, host governments have imposed restrictions, controls and taxes, and in others, political conditions have existed that may threaten the safety of employees and the company’s continued presence in those countries. Internal unrest, acts of violence or strained relations between a host government and the company or other governments may affect the company’s operations. Those developments have at times significantly affected the company’s related operations and results and are carefully considered by management when evaluating the level of current and future activity in such countries.

      Equity Redetermination For oil and gas producing operations, ownership agreements may provide for periodic reassessments of equity interests in estimated crude oil and natural gas reserves. These activities, individually or together, may result in gains or losses that could be material to earnings in any given period. One such equity redetermination process has been under way since 1996 for Chevron’s interests in four producing zones at the Naval Petroleum Reserve at Elk Hills in California, for the time when the remaining interests in these zones were owned by the U.S. Department of Energy. A wide range remains for a possible net settlement amount for the four zones. Chevron currently estimates its maximum possible net before-tax liability at approximately $200 million. At the same time, a possible maximum net amount that could be owed to Chevron is estimated at about $50 million. The timing of the settlement and the exact amount within this range of estimates are uncertain.

      Other Contingencies Chevron receives claims from and submits claims to customers, trading partners, U.S. federal, state and local regulatory bodies, host governments, contractors, insurers, and suppliers. The amounts of these claims, individually and in the aggregate, may be significant and take lengthy periods to resolve.

      The company and its affiliates also continue to review and analyze their operations and may close, abandon, sell, exchange, acquire or restructure assets to achieve operational or strategic benefits and to improve competitiveness and profitability. These activities, individually or together, may result in gains or losses in future periods.

First Quarter 2006 Compared with First Quarter 2005

Income by Business Segments

      Net income for the 2006 first quarter was $4 billion ($1.80 per share — diluted), compared with $2.7 billion ($1.28 per share — diluted) in the corresponding 2005 period. In the following discussions, the term “earnings” is defined as segment income.

      Upstream earnings in the first quarter 2006 were $3.5 billion, compared with $2.4 billion in the year-ago period. Results for the current period benefited mainly from higher average prices for crude oil and natural gas. Also contributing to the improvement was a nearly 10 percent increase in net oil-equivalent production to 2.6 million barrels per day, reflecting production added through the acquisition of Unocal Corporation in August 2005.

      Downstream earnings were $580 million in the first quarter 2006, up $171 million from a year earlier. The increase was associated mainly with higher average margins for refined products and improved refinery operations. Crude oil inputs to the company’s refineries in the 2006 first quarter were up 8 percent worldwide and 10 percent in the United States.

      Chemicals segment income was up 12 percent from the 2005 first quarter to $153 million, due mainly to improved margins for commodity chemicals and additives for fuels and lubricating oils.

      Refer to pages 25 - 27 for additional discussion of earnings by business segment for the first quarter 2006 vs. the same period in 2005.

      Chevron’s current and future earnings depend largely on the profitability of its upstream (exploration and production) and downstream (refining, marketing and transportation) business segments. The single biggest

factor that affects the results of operations for both segments is the movement in the price of crude oil. In the downstream business, crude oil is the largest cost component of refined products. The overall trend in earnings is typically less affected by results from the company’s chemical business and other activities and investments. Earnings for the company in any period may also be influenced by events or transactions that are infrequent and/or unusual in nature.

      The company’s long-term competitive position, particularly given the capital-intensive and commodity-based nature of the industry, is closely associated with the company’s ability to invest in projects that provide adequate financial returns and to manage operating expenses effectively. Creating and maintaining an inventory of investment projects depends on many factors, including obtaining rights to explore for crude oil and natural gas, developing and producing hydrocarbons in promising areas, drilling successfully, bringing long-lead-time capital-intensive projects to completion on budget and on schedule, and operating mature upstream properties efficiently and profitably.

      The company also continuously evaluates opportunities to dispose of assets that are not key to providing sufficient long-term value, or to acquire assets or operations complementary to its asset base to help augment the company’s growth. Asset disposition and restructuring may occur in future periods and could result in significant gains or losses.

      In August 2005, the company acquired Unocal Corporation (Unocal), an independent oil and gas exploration and production company, for an aggregate purchase price of $17.3 billion. The integration of the former Unocal operations into Chevron’s business activities is substantially complete. Refer to Note 2 on page 7 for additional discussion of the Unocal acquisition.

      Comments related to the trend in earnings for the company’s major business areas are as follows:

      Upstream Earnings for the upstream segment are closely aligned with industry price levels for crude oil and natural gas. Crude oil and natural gas prices are subject to external factors over which the company has no control, including product demand connected with global economic conditions, industry inventory levels, production quotas imposed by the Organization of Petroleum Exporting Countries (OPEC), weather-related damages and disruptions, competing fuel prices, and regional supply interruptions that may be caused by military conflicts, civil unrest or political uncertainty. Moreover, any of these factors could also inhibit the company’s production capacity in an affected region. The company monitors developments closely in the countries in which it operates and holds investments, and attempts to manage risks in operating its facilities and business.

      During 2005, industry price levels for West Texas Intermediate (WTI), a benchmark crude oil, averaged about $57 per barrel. Prices continued an upward trend in the first quarter 2006, and remained at higher levels than the corresponding period in 2005. In the first quarter 2006, WTI averaged $63 per barrel, compared with about $50 per barrel in the year-ago period. The average price for WTI during April 2006 was $69 per barrel. The rise in crude oil prices reflects, among other things, a heightened level of geopolitical uncertainty in some areas of the world, strong worldwide demand, and supply concerns in key producing regions, including production in the Gulf of Mexico that remains partially shut in from hurricanes Katrina and Rita in 2005.

      As was the case in 2005, the differential in prices between high-quality, light-sweet crude oils, such as the U.S. benchmark WTI, and the heavier crudes was wide during the first quarter 2006. Chevron produces heavy crude oil in California, Chad, Indonesia, the Partitioned Neutral Zone (between Saudi Arabia and Kuwait), Venezuela (including volumes under an operating service agreement) and certain fields in Angola, China and the United Kingdom North Sea. The price for heavier crudes has been dampened because of ample supply, together with lower relative demand due to the limited number of refineries that are able to process this lower-quality feedstock into light products (i.e., motor gasoline, jet fuel, aviation gasoline and diesel fuel). The price for higher-quality light oil, in comparison, has remained high, as the demand for light products, which can be manufactured by any refinery from light oil, has been strong worldwide.

      U.S. benchmark prices for Henry Hub natural gas averaged $7.80 per thousand cubic feet (MCF) in the first quarter 2006, compared with about $6.30 for the corresponding 2005 period. Fluctuations in the price for natural gas in the United States are closely associated with the volumes produced in North America and the

inventory in underground storage relative to customer demand. Natural gas prices in the United States are also typically higher during the winter period, when demand for heating is greatest.

      In contrast to the United States, certain other regions of the world in which the company operates have different supply, demand and regulatory circumstances for natural gas, typically resulting in significantly lower average sales prices for the company’s production. (Refer to page 30 for the company’s average natural gas prices for the U.S. and international regions.) Additionally, excess supply conditions that exist in certain parts of the world cannot easily serve to mitigate the relatively high-price conditions in the United States and other markets because of the lack of infrastructure and the difficulties in transporting natural gas.

      To help address this regional imbalance between supply and demand for natural gas, Chevron is planning increased investments in long-term projects in areas of excess supply to install infrastructure to produce and liquefy natural gas for transport by tanker, along with investments and commitments to regasify the product in markets where demand is strong and supplies are not as plentiful. Due to the significance of the overall investment in these long-term projects, the natural gas sales prices in the areas of excess supply (before the natural gas is transferred to a company-owned or third-party processing facility) are expected to remain well below sales prices for natural gas that is produced much nearer to areas of high demand and that can be transported in existing natural gas pipeline networks (as in the United States).

      Besides the impact of the fluctuation in price for crude oil and natural gas, the longer-term trend in earnings for the upstream segment is also a function of other factors, including changes in the company’s crude oil and natural gas production levels, changes in tax rates, and the company’s ability to find or acquire and efficiently produce crude oil and natural gas reserves. Most of the company’s overall capital investment is in its upstream businesses, particularly outside the United States. Investments in upstream projects generally are made well in advance of the start of the associated crude oil and natural gas production.

      In 2005, the Venezuelan government stipulated that Chevron’s existing Boscan and LL-652 operating service agreements be converted to an Empresa Mixta (EM), or a joint stock contractual structure, with Petróleos de Venezuela, S.A. (PDVSA) as majority shareholder. In March 2006, Chevron signed a memorandum of understanding agreement with PDVSA and continues to negotiate the format of the final EM structure. Also in March, Venezuela’s tax agency proposed an oil-tax reform that would increase the future tax rate for all extra-heavy crude projects in the Orinoco Belt, including the company’s interest in the operations at Hamaca. The company settled a tax claim during March in which the main issue was the tax rate in effect on activities under operating service agreements that are outside the Orinoco Belt. The financial implications of the final EM structure and the proposed tax increase are uncertain but are not expected to have a material effect on the company’s consolidated financial position or liquidity.

      The level of oil-equivalent production in future periods is uncertain, in part due to quotas that may be imposed by OPEC, the price effect on production volumes calculated under cost-recovery and variable-royalty provisions of certain contracts, the potential for local civil unrest and changing geopolitics that could cause production disruptions, severe weather, and production-restoration efforts that continue in the Gulf of Mexico following damages to infrastructure caused by hurricanes in 2005.

      Approximately 25 percent of the company’s net oil-equivalent production in the first quarter 2006, including volumes from oil sands in Canada and production under an operating service agreement in Venezuela, occurred in the OPEC-member countries of Indonesia, Nigeria and Venezuela and in the Partitioned Neutral Zone between Saudi Arabia and Kuwait. Although the company’s production level during the first quarter 2006 was not constrained in these areas by OPEC quotas, future production could be affected by OPEC-imposed limitations. Future production levels also are affected by the size and number of economic investment opportunities and, for new large-scale projects, the time lag between initial exploration and the beginning of production.

      In certain onshore areas of Nigeria, approximately 30,000 barrels per day of the company’s net production capacity remains shut in because of civil unrest and damages to facilities that occurred in 2003. The company has adopted a phased plan to restore this capacity as conditions permit.

      Production offline in the Gulf of Mexico due to last year’s hurricanes continues to be restored. In the first quarter 2006, net oil-equivalent production was about 200,000 barrels per day, up more than 20 percent from the fourth quarter 2005. Production for the full-year 2006 is also expected to average 200,000 barrels per day, as the restoration of additional volumes will be essentially offset by normal field declines occurring elsewhere in the region.

      Refer also to the Results of Operations on pages 25 - 26 for additional discussion of U.S. and international production trends.

      Downstream Earnings for the downstream segment are closely tied to global and regional supply and demand for refined products and the associated effects on industry refining and marketing margins. The company’s core marketing areas are the West Coast of North America, the U.S. Gulf Coast, Latin America, Asia and sub-Saharan Africa. Earnings improved during the first quarter 2006, mainly the result of higher average margins for refined products and improved operations at the company’s refineries. Industry margins in the future may be volatile, due primarily to changes in the price of crude oil used for refinery feedstock, disruptions at refineries resulting from maintenance programs and mishaps and levels of inventory and demand for refined products.

      Other influences on the company’s profitability in this segment include the operating efficiencies and expenses of the refinery network, including the effects of any downtime due to planned and unplanned maintenance or severe weather, refinery upgrade projects and operating incidents. The level of operating expenses for the downstream segment can also be affected by the volatility of charter expenses for the company’s shipping operations, which are driven by the industry’s demand for crude-oil and product tankers. Other factors affecting the company’s downstream profitability that are beyond the company’s control include the general level of inflation and energy costs to operate the refinery network.

      Refer also to the Results of Operations on page 26 for additional discussion of downstream earnings.

      Chemicals Earnings in the petrochemical business are closely tied to global chemical demand, industry inventory levels and plant capacity utilization. Additionally, feedstock and fuel costs, which tend to follow crude oil and natural gas price movements, influence earnings in this segment.

      Refer also to the Results of Operations on page 27 for additional discussion of chemical earnings.

      Noteworthy operating developments and events in recent months included the following:

      Business Segments The following section presents the results of operations for the company’s business segments — upstream, downstream and chemicals — as well as for “all other” — the departments and companies managed at the corporate level. (Refer to Note 4 beginning on page 9 for a discussion of the company’s “reportable segments,” as defined in FAS 131, “Disclosures about Segments of an Enterprise and Related Information.”)

      U.S. upstream income of $1.2 billion increased $447 million from the first quarter 2005. Higher prices for crude oil and natural gas increased earnings by approximately $550 million between periods. A 4 percent increase in oil-equivalent production also contributed to the earnings improvement. Partially offsetting these benefits were higher operating expenses, including costs associated with the repair and restoration of facilities that were damaged last year by hurricanes in the Gulf of Mexico.

      The average liquids realization in 2006 was $53.45 per barrel, up from $38.68. The average natural gas realization was $7.46 per thousand cubic feet, compared with $5.76 in the 2005 quarter.

      Net oil-equivalent production of 750,000 barrels per day in the 2006 quarter was 31,000 higher than a year ago. An increase in volumes associated with the former Unocal properties was partially offset by the effects of normal field declines and production that was offline due to the hurricane damages. The net liquids component of oil-equivalent production was relatively flat at 453,000 barrels per day in 2006. Net natural gas production of 1.8 billion cubic feet per day was up 11 percent.

      International upstream income of $2.2 billion in the first quarter 2006 increased $632 million from a year earlier, mainly as a result of an approximate $650 million benefit from higher prices for crude oil and natural gas. A 12 percent increase in oil-equivalent production also contributed to the earnings improvement. Partially offsetting these benefits were higher expenses, which included settlement of a tax claim in Venezuela and

write-offs associated with the Hebron project offshore eastern Canada, after activities there were suspended. Foreign currency effects decreased earnings by $123 million in the first quarter 2006 vs. $18 million a year earlier. The currency impact in 2006 was due mainly to the strengthening of the currency in Thailand against the U.S. dollar.

      The average liquids realization for the first quarter 2006 was $55.13 per barrel, an increase of 36 percent from $40.42 in the 2005 period. The average natural gas realization in 2006 was $3.78 per thousand cubic feet, up from $2.95 in the first quarter last year.

      Net oil-equivalent production, including volumes from oil sands in Canada and an operating service agreement in Venezuela, increased 12 percent to 1.9 million barrels per day in the first quarter 2006. Higher production as a result of the Unocal acquisition was partially offset by reduced output due to equipment repairs at facilities in Kazakhstan, lower cost-recovery volumes under certain production-sharing agreements and the effects of storms in Australia. The net liquids component of oil-equivalent production increased 2 percent between periods to 1.4 million barrels per day. Net natural gas production of 3.2 billion cubic feet per day in the first quarter 2006 increased 47 percent from the year-ago period.

      U.S. downstream earnings of $210 million increased $152 million from the 2005 first quarter, primarily as a result of improved refinery utilization and higher refined-product margins. Earnings in the 2005 period were significantly affected by both planned and unplanned refinery downtime.

      Crude oil inputs of 939,000 barrels per day to the company’s refineries were up about 10 percent between periods. Refined-product sales increased 5 percent to 1,534,000 barrels per day. Branded gasoline sales increased 2 percent from last year’s quarter to 595,000 barrels per day, mainly reflecting the continued growth of the Texaco brand.

      International downstream income of $370 million increased approximately 5 percent from the first quarter 2005. The increase resulted mainly from improved margins for refined products in most of the company’s operating areas.

      The company’s share of refinery crude-oil inputs of 1,079,000 barrels per day was up about 6 percent between periods. Total refined-product sales volumes of 2,332,000 barrels per day in the 2006 quarter were about the same as last year.

      Chemical operations earned $153 million in the first quarter 2006, compared with $137 million in the 2005 period. Improved results were due to higher margins for olefins and polyolefins at the 50 percent-owned Chevron Phillips Chemical Company LLC affiliate and higher margins for additives sold by the company’s Oronite subsidiary for use in fuels and lubricating oils.

      All Other consists of the company’s interest in Dynegy, mining operations of coal and other minerals, power generation businesses, worldwide cash management and debt financing activities, corporate administrative functions, insurance operations, real estate activities and technology companies.

      Net charges were $195 million in the first quarter 2006, compared with $248 million in the corresponding 2005 period. The decrease in net charges was primarily associated with reduced Dynegy losses and favorable foreign currency effects.

      Explanations are provided below of variations between periods for certain income statement categories:

      Sales and other operating revenues in the 2006 first quarter increased mainly on higher prices for crude oil, natural gas and refined products, as well as the inclusion of revenues related to former-Unocal operations.

      Improved results for the company’s Hamaca (Venezuela), Escravos gas-to-liquids (Nigeria), Tengizchevroil (Kazakhstan) affiliates and reduced losses from Dynegy were partially offset by lower earnings from the company’s downstream affiliates in the Asia-Pacific area.

      Other income in 2006 decreased due to foreign currency effects and the absence of net gains from the sale of a Canadian upstream equity investment in 2005. These effects were partially offset by higher interest income in the current period.

      The increase in crude oil and product purchases in the 2006 period was primarily the result of higher prices for crude oil, natural gas and refined products, as well as to the inclusion of Unocal-related amounts.

      Operating, selling, general and administrative expenses in the first quarter 2006 increased 24 percent from the year-ago period. Higher amounts in 2006 included former-Unocal operations, and, for heritage-Chevron operations, higher costs for transportation, fuel and labor; uninsured costs associated with the storms in the Gulf of Mexico last year; and higher costs for environmental remediation.

      Exploration expenses in 2006 increased mainly due to the inclusion of expenses for the former Unocal operations and higher amounts for well write-offs associated with heritage-Chevron properties.

      The increase in 2006 was mainly the result of Unocal-related depreciation and depletion.

      Taxes other than on income decreased due to lower sales volumes subject to duties in the company’s European downstream operations.

      Interest and debt expense in 2006 increased primarily due to the inclusion of debt assumed with the Unocal acquisition and higher average interest rates for variable-rate debt.

      Effective income tax rates for the 2006 and 2005 first quarters were 48 percent and 45 percent, respectively. The primary reason for the higher rate in 2006 was that proportionally more income was earned in 2006 than in 2005 in countries with high tax rates.

      At March 31, 2006, Chevron owned an approximate 24 percent equity interest in the common stock of Dynegy Inc. (Dynegy), a provider of electricity to markets and customers throughout the United States. The company also held an investment in Dynegy preferred stock.

      Investment in Dynegy Common Stock At March 31, 2006, the carrying value of the company’s investment in Dynegy common stock was $307 million. This amount was about $200 million below the company’s proportionate interest in Dynegy’s underlying net assets. This difference is primarily the result of write-downs of the investment in 2002 for declines in the market value of the common shares below the company’s carrying value that were determined to be other than temporary. The difference had been assigned to the extent practicable to specific Dynegy assets and liabilities, based upon the company’s analysis of the various factors associated with the decline in value of the Dynegy shares. The company’s equity share of Dynegy’s reported earnings is adjusted quarterly when appropriate to recognize a portion of the difference between these allocated values and Dynegy’s historical book values. The market value of the company’s investment in Dynegy’s common stock at March 31, 2006, was $465 million.

      Investment in Dynegy Preferred Stock At March 31, 2006, the company held $400 million face value of Dynegy Series C preferred stock with a stated maturity of 2033. The stock is accounted for at its fair value, which was estimated to be $375 million at March 31, 2006. Temporary changes in the estimated fair value of the preferred stock are reported in “Other Comprehensive Income.” However, if in any future period a decline in fair value is deemed to be other than temporary, a charge against income in the period would be recorded. Dividends received from the preferred stock are recorded to income in the period received.

      The following table presents a comparison of selected operating data:

Selected Operating Data(1)(2)