Index to Financial Statements

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE

OF THE SECURITIES EXCHANGE ACT OF 1934

For the Fiscal Year Ended December 31, 20082009

Commission file number 1-5153

Marathon Oil Corporation

(Exact name of registrant as specified in its charter)

5555 San Felipe Road, Houston, TX 77056-2723

(Address of principal executive offices)

(713) 629-6600

(Registrant’s telephone number, including area code)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes  þ    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes  ¨    No  þ

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 and (2) has been subject to such filing requirements for the past 90 days. Yes  þ    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes  þ    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. Yes  þ    No  ¨

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

Large accelerated filerþ    Accelerated filer¨    Non-accelerated filer¨    Smaller reporting company¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).

Yes  ¨    No  þ

The aggregate market value of Common Stock held by non-affiliates as of June 30, 2008: $36,5592009: $21,272 million. This amount is based on the closing price of the registrant’s Common Stock on the New York Stock Exchange on that date. Shares of Common Stock held by executive officers and directors of the registrant are not included in the computation. However, the registrant has made no determination that such individuals are “affiliates” within the meaning of Rule 405 of the Securities Act of 1933.

There were 707,524,845707,926,768 shares of Marathon Oil Corporation Common Stock outstanding as of January 31, 2009.29, 2010.

Documents Incorporated By Reference:

Portions of the registrant’s proxy statement relating to its 20092010 annual meeting of stockholders, to be filed with the Securities and Exchange Commission pursuant to Regulation 14A under the Securities Exchange Act of 1934, are incorporated by reference to the extent set forth in Part III, Items 10-14 of this report.

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MARATHON OIL CORPORATION

Unless the context otherwise indicates, references to “Marathon,” “we,” “our,” or “us” in this Annual Report on Form 10-K are references to Marathon Oil Corporation, including its wholly-owned and majority-owned subsidiaries, and its ownership interests in equity method investees (corporate entities, partnerships, limited liability companies and other ventures over which Marathon exerts significant influence by virtue of its ownership interest).

TABLE OF CONTENTSTable of Contents

Index to Financial Statements

Disclosures Regarding Forward-Looking Statements

This Annual Report on Form 10-K, particularly Item 1. Business, Item 1A. Risk Factors, Item 3. Legal Proceedings, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations and Item 7A. Quantitative and Qualitative Disclosures about Market Risk, includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These statements typically contain words such as “anticipate,” “believe,” “estimate,” “expect,” “forecast,” “plan,” “predict,” “target,” “project,” “could,” “may,” “should,” “would” or similar words, indicating that future outcomes are uncertain. In accordance with “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, these statements are accompanied by cautionary language identifying important factors, though not necessarily all such factors, that could cause future outcomes to differ materially from those set forth in the forward-looking statements.

Forward-looking statements in this Report may include, but are not limited to, levels of revenues, gross margins, income from operations, net income or earnings per share; levels of capital, exploration, environmental or maintenance expenditures; the success or timing of completion of ongoing or anticipated capital, exploration or maintenance projects; volumes of production, sales, throughput or shipments of liquid hydrocarbons, natural gas, bitumensynthetic crude oil and refined products; levels of worldwide prices of liquid hydrocarbons, natural gas and refined products; levels of reserves of liquid hydrocarbons, natural gas and bitumen;synthetic crude oil; the acquisition or divestiture of assets; the effect of restructuring or reorganization of business components; the potential effect of judicial proceedings on our business and financial condition; levels of common share repurchases; and the anticipated effects of actions of third parties such as competitors, or federal, foreign, state or local regulatory authorities.

PART I

Item 1. Business

General

Marathon Oil Corporation was originally organized in 2001 as USX HoldCo, Inc., a wholly-owned subsidiary of the former USX Corporation. As a result of a reorganization completed in July 2001, USX HoldCo, Inc. (1) became the parent entity of the consolidated enterprise (the former USX Corporation was merged into a subsidiary of USX HoldCo, Inc.) and (2) changed its name to USX Corporation. In connection with the transaction described in the next paragraph (the “USX Separation”), USX Corporation changed its name to Marathon Oil Corporation.

Before December 31, 2001, Marathon had two outstanding classes of common stock: USX-Marathon Group common stock, which was intended to reflect the performance of our energy business, and USX-U.S. Steel Group common stock (“Steel Stock”), which was intended to reflect the performance of our steel business. On December 31, 2001, we disposed of our steel business through a tax-free distribution of the common stock of our wholly-owned subsidiary United States Steel Corporation (“United States Steel”) to holders of Steel Stock in exchange for all outstanding shares of Steel Stock on a one-for-one basis.

In connection with the USX Separation, our certificate of incorporation was amended on December 31, 2001, and Marathon has had only one class of common stock authorized since that date.

On June 30, 2005, we acquired the 38 percent ownership interest in Marathon Ashland Petroleum LLC (“MAP”) previously held by Ashland Inc. (“Ashland”). In addition, we acquired a portion of Ashland’s Valvoline Instant Oil Change business, its maleic anhydride business, its interest in LOOP LLC which owns and operates the only U.S. deepwater oil port, and its interest in LOCAP LLC which owns a crude oil pipeline. As a result of the transactions, MAP is wholly owned by Marathon and its name was changed to Marathon Petroleum Company LLC (“MPC”) effective September 1, 2005.

On October 18, 2007, we acquired all the outstanding shares of Western Oil Sands Inc. (“Western”). Western’s primary asset was a 20 percent outside-operated interest in the outside-operated Athabasca Oil Sands Project (“AOSP”), an oil sands mining joint venture located in the province of Alberta, Canada. The acquisition was accounted for under the purchase method of accounting and, as such, our results of operations include Western’s results from October 18, 2007. Western’s oil sands mining and bitumen upgrading operations are reported as a separate Oil Sands Mining

segment, while its ownership interests in leases where in-situ recovery techniques are expected to be utilized are included in the Exploration and Production segment.

Index to Financial Statements

Segment and Geographic Information

Our operations consist of four reportable operating segments: 1) Exploration and Production (“E&P”) – explores for, produces and markets liquid hydrocarbons and natural gas on a worldwide basis; 2) Oil Sands Mining (“OSM”) – mines, extracts and transports bitumen from oil sands deposits in Alberta, Canada, and upgrades the bitumen to produce and market synthetic crude oil and by-products;vacuum gas oil; 3) Refining, Marketing and Transportation (“RM&T”) – refines, markets and transports crude oil and petroleum products, primarily in the Midwest, upper Great Plains, Gulf Coast and southeastern regions of the United States; and 4) Integrated Gas (“IG”) – markets and transports products manufactured from natural gas, such as liquefied natural gas (“LNG”) and methanol, on a worldwide basis,basis; and is developing other projects to link stranded natural gas resources with key demand areas.4) Refining, Marketing and Transportation (“RM&T”) – refines, transports and markets crude oil and petroleum products, primarily in the Midwest, upper Great Plains, Gulf Coast and southeastern regions of the United States. For operating segment and geographic financial information, see Note 109 to the consolidated financial statements.

The E&P, OSM and IG segments comprise our upstream operations. The RM&T segment comprises our downstream operations.

Exploration and Production

In the discussion that follows regarding our exploration and production operations, references to “net” wells, sales or investment indicate our ownership interest or share, as the context requires.

We conductAt the end of 2009, we were conducting oil and gas exploration, development and production activities in teneight countries: the United States, Angola, Canada, Equatorial Guinea, Gabon, Indonesia, Ireland, Libya, Norway and the United Kingdom. During 2009, we exited Gabon and Ireland. We plan to begin exploration activities in Poland during 2010.

Our 20082009 worldwide net liquid hydrocarbon sales averaged 211243 thousand barrels per day (“mbpd”). Our 20082009 worldwide net natural gas sales, including natural gas acquired for injection and subsequent resale, averaged 1,016941 million cubic feet per day (“mmcfd”). In total, our 20082009 worldwide net sales averaged 381400 thousand barrels of oil equivalent per day (“mboepd”). For purposes of determining barrels of oil equivalent (“boe”), natural gas volumes are converted to approximate liquid hydrocarbon barrels by dividing the natural gas volumes expressed in thousands of cubic feet (“mcf”) by six. The liquid hydrocarbon volume is added to the barrel equivalent of natural gas volume to obtain boe.

Exploration These volumes exclude 7 mboepd related to discontinued operations.

In the United States during 2008,2009, we drilled 7176 gross (48(50 net) exploratory wells of which 6072 gross (42(48 net) wells encountered commercial quantities of hydrocarbons. Of these 6072 wells, 36 were temporarily suspended or in the process of being completed at year end. Internationally, we drilled 129 gross (3(1 net) exploratory wells of which 116 gross (3(1 net) wells encountered commercial quantities of hydrocarbons. Of these 11 wells, 5 gross (1 net)All 6 wells were temporarily suspended or were in the process of being completed at December 31, 2008.2009.

North America

United States– Our U.S. operations accounted for 26 percent of our 2009 worldwide net liquid hydrocarbon sales volumes and 40 percent of our worldwide net natural gas sales volumes.

Offshore – The Gulf of Mexico continues to be a core area. At the end of 2008, we had interests in 103 blocks in the Gulf of Mexico, including 97 in the deepwater area. We have been awarded 42 blocks on which we were the high bidder in the federal Outer Continental Shelf Lease Sales No. 205 and 206 conducted by the U.S. Minerals Management Service (“MMS”) in late 2007 and early 2008. Our initial net investment in these blocks was $343 million. We own 100 percent of fifteen of the blocks. We acquired the remaining blocks in conjunction with partners. Our plans call for initial drilling on some of these leases inDuring 2009, and 2010.

In 2008, a successful appraisal well was drilled on the Stones prospect located on Walker Ridge Block 508 after a 2005 discovery. We hold a 25 percent outside-operated interest in the Stones prospect. In the third quarter of 2008, we announced a Gulf of Mexico deepwater discovery on the Gunflint prospect located on Mississippi Canyon Block 948. We own a 13 percent outside-operated interest in the prospect. In the first quarter of 2009, we participated in a deepwater discovery on the Shenandoah prospect located on Walker Ridge Block 52. We own a 20 percent outside-operated interest in the prospect.

In 2008, we successfully completed our first horizontal well in the Woodford Shale resource play in the Anadarko Basin of Oklahoma. We are currently participating in additional horizontal wells in the area where we hold 30,000 net acres.

We hold acreage in two additional emerging shale resource plays in the U.S. In the Appalachian Basin we hold 65,000 net acres in the Marcellus Shale resource play in Pennsylvania and West Virginia. We hold 25,000 net acres, primarily in Texas, in the Haynesville Shale resource play located in north Louisiana and east Texas. Initial drilling on some of these leases is planned for 2009.

Angola – Offshore Angola, we hold a 10 percent outside-operated interest in Block 31 and a 30 percent outside-operated interest in Block 32. Through December 2008, 28 discoveries on these blocks have been announced, including the Portia and Dione discoveries on Angola Block 31 in 2008.

Index to Financial Statements

Norway –We hold interests in over 510,000 gross acres offshore Norway, including production license 505 (“PL 505”) that was awarded in January 2009. In 2009, exploration drilling is expected to commence on additional prospects with the potential to be tied back to the Alvheim complex.

Indonesia – We are the operator and hold a 70 percent interest in the Pasangkayu Block offshore Indonesia. The 1.2 million acre block is located mostly in deep water, predominantly offshore of the island of Sulawesi in the Makassar Strait, directly east of the Kutei Basin production region. The production sharing contract with the Indonesian government was signed in 2006 and we completed 3D seismic acquisition in May 2008. We expect to begin exploratory drilling in early 2010. Additionally, in October 2008, we were granted a 49 percent interest and operatorship in the Bone Bay Block offshore Indonesia. The Bone Bay Block is 200 miles southeast of our Pasangkayu Block. Current exploration plans for Bone Bay call for the acquisition of seismic data starting in 2010, followed by drilling in 2011.

We are the operator of a drilling rig consortium that has secured a two-year contract for a deepwater exploration drilling rig. The rig will be used for deepwater exploration activities by us and by five other companies in Indonesia. The participants have the right to extend this rig commitment.

We continue to participate in joint study agreements in Indonesia, which provide a right of first refusal in future bid rounds. We completed two joint study agreements in 2008.

Equatorial Guinea – During 2004, we announced the Deep Luba and Gardenia discoveries on the Alba Block, in which we hold a 63 percent operated interest, and the Corona well on Block D, where we are the operator with a 90 percent interest. These wells are part of our long-term LNG strategy. We expect these discoveries to be developed when the natural gas supply from the nearby Alba Field starts to decline.

Libya – We hold a 16 percent outside-operated interest in the Waha concessions, which encompass almost 13 million acres located in the Sirte Basin. Our exploration program in 2008 included the drilling of three wells, all of which were successful. Most of these discoveries extended previously defined hydrocarbon accumulations.

Canada – We hold interests in both operated and outside-operated exploration-stage in-situ oil sand leases as a result of the acquisition of Western in 2007. Initial test drilling on the 100 percent interest Birchwood prospect positively confirmed bitumen presence with additional test drilling required to confirm reservoir quality.

United Kingdom – We have a 45 percent interest in five exploratory U.K. onshore coal seam gas (“CSG”) licenses. Drilling has been completed in five exploration wells in three of the licenses. One test well was completed in 2007 and three lateral wells for production testing were drilled in 2008. We and our partners were awarded 11 new blocks for CSG exploration and potential future development during the 13th Onshore Licensing Round in 2008. After the 2008 licensing our interest covers 520,000 acres. We are the operator of these new licenses and have a 55 percent working interest.

Production (including development activities)

United States –Our U.S. operations accounted for 30 percent of our 2008 worldwide net liquid hydrocarbon sales volumes and 44 percent of our worldwide net natural gas sales volumes.

During 2008, our net sales in the Gulf of Mexico averaged 2324 mbpd of liquid hydrocarbons representing 36 percent of our total U.S. net liquid hydrocarbon sales, and 20 mmcfd of natural gas, representing five percent of our total U.S. net natural gas sales.gas. At year end 2008,2009, we held interests in sixseven producing fields and fivefour platforms in the Gulf of Mexico, of which we operate one platform.

Hurricanes Gustav and Ike impacted GulfWe operate the Ewing Bank 873 platform which is located 130 miles south of MexicoNew Orleans, Louisiana. The platform started operations in 1994 and serves as a production hub for the latter part of the third quarter of 2008, resulting in approximately 9.5 net mboepd being shut-in during the quarter.Lobster, Oyster and Arnold fields. The Ewing Bank development resumedfacility also processes third-party production in October 2008, but the outside-operated Ursa and Troika fields were shut-in for repairs until November 2008 and January 2009, respectively, impacting fourth quarter sales by approximately 7 mboepd. We have a 65 percent working interest in Ewing Bank, a four percent overriding royalty interest in Ursa and a 50 percent working interest in Troika.via subsea tie-backs.

We own a 50 percent outside-operated interest in the outside-operated Petronius field on Viosca Knoll Blocks 786 and 830. An additional development well was successfully completed in 2009. The Petronius platform also providesis capable of providing processing and transportation services to adjacentnearby third-party fields. For example, Petronius processes liquid hydrocarbons from our Perseus field which commenced production in April 2005 and is located five miles from the platform.

Index to Financial Statements

The Neptune development in the Gulf of Mexico commenced production of liquid hydrocarbons and natural gas in July 2008. We hold a 30 percent outside-operated working interest in this outside-operated development located on Atwater Valley area in the Gulf of Mexico,575, 120 miles off the coast of Louisiana. The completed Phase I development plan included sevensix subsea wells tied back to a stand-alone platformplatform. Phase II development activities have begun and six wells have beenthe first well in this program was successfully drilled and completed.completed in late 2009.

In October 2008, developmentDevelopment of the Droshky discovery, located in the Gulf of Mexico on Green Canyon Block 244, was authorized by our boardcontinued in 2009. Droshky Phase I is a four well liquid hydrocarbon development with first production targeted for mid-year 2010. Ongoing development activities include running intelligent well completions, installation of directors. The initial Droshky discovery wellthe subsea facilities and two sidetracks were drilled in 2007, followed in 2008 by a second delineation and sidetrack well. The project will consist of development wells, which will be tied backtopside modifications to the nearby third-party owned and operated Bullwinkle host platform. We have secured a rig to begin drilling in 2009, and firstExpected net peak production is targeted for 2010. Net sales after royalties are expected to peak at about 45 mbpd of liquid hydrocarbons and 43 mmcfd of natural gas.approximately 50 mboepd. We hold a 100 percent operated working interest in Droshky.

Also in October 2008, developmentDevelopment of the Ozona prospect, located in the Gulf of Mexico on Garden Banks Block 515, was authorized by our board of directors.has also continued. We have secured a rig to complete the previously drilled appraisal well and tie back to the nearby outside-operatedthird-party Auger platform. First production is expected in 2011. We hold a 68 percent working interest in Ozona.

In 2008, we drilled a successful liquid hydrocarbon appraisal well on the Stones prospect located on Walker Ridge Block 508. We hold a 25 percent interest in the outside-operated Stones prospect. In the third quarter of 2008, we announced deepwater liquid hydrocarbon discovery on the Gunflint prospect located on Mississippi Canyon Block 948. We own a 13 percent interest in this outside-operated prospect. In the first quarter of 2009, we participated in a deepwater liquid hydrocarbon discovery on the Shenandoah prospect located on Walker Ridge Block 52. We own a 20 percent interest in the outside-operated prospect. In December 2009, we began drilling the Flying Dutchman well, on Green Canyon Block 511, where we have 63 percent ownership and are the operator of this liquid hydrocarbon prospect.

In addition to the prospects listed above, we held interests in 103 blocks in the Gulf of Mexico at the end of 2009, including 97 in the deepwater area. Our plans call for exploration drilling on some of these leases in 2010 and 2011.

Onshore – We produce natural gas in the Cook Inlet and adjacent Kenai Peninsula of Alaska. We have operated and outside-operated interests in 10 fields and hold a 51 to 100 percent working interest in each. In 2008,2009, our net natural gas sales from Alaska averaged 126 mmcfd, representing 28 percent of87 mmcfd. Typically, our total U.S. net natural gas sales volumes. Our natural gas sales from Alaska are seasonal in nature, trending down during the second and third quarters of each year and increasing during the fourth and first quarters. To manage supplies to meet contractual demand we produce and store natural gas in a partially depleted reservoir in the Kenai natural gas field.

Net liquid hydrocarbon and natural gas sales from our Wyoming fields averaged 19 mbpd and 123 mmcfd in 2008. Our Wyoming net natural gas sales decreased from the prior year primarily as a result of natural field declines, partially offset by new In 2009, we drilled six wells in the Wamsutter FieldAlaska and Powder River Basin areas. Development of the Powder River Basin continued in 2008 with 100 operated wells drilled, which was down from the 170 wells drilled in 2007. Additional development of our southwest Wyoming interests continued in 2008 where we participated in the drilling of six wells.

We also have domestic natural gas operations in Oklahoma, east Texas and north Louisiana, with combined net sales of 137 mmcfd in 2008, and liquid hydrocarbon operations in the Permian Basin of southeast New Mexico and west Texas, with net sales of 11 mbpd in 2008.

We hold 320,000 acres in the Williston Basin (the Bakken Shale resource play). The majority of the acreage is located in North Dakota with the remainder in eastern Montana. This represents a substantial position in the Bakken Shale where approximately 225 locations will be drilled over the nextplan to drill four to five years. We currently have four operated drilling rigs running and ended 2008 with December average net sales of 8.2 mboepd.six wells per year during 2010 through 2012.

We hold leases with natural gas production in the Piceance Basin of Colorado, located in Garfield County in the Greater Grand Valley field complex. Our plans include drilling approximately 15065 wells over the next five years. Drilling and production commenced in late 2007. We currently have one operated drilling rig running and ended 2008averaged net sales of 15 mmcfd in 2009.

We hold 336,000 acres over the Bakken Shale oil play in the Williston Basin of North Dakota with Decembera working interest of approximately 84 percent. Approximately 225 locations will be drilled over the next four to five years. We are evaluating other potential horizons above and below the Middle Bakken. We currently have four operated drilling rigs running in our Bakken program. We exited 2009 with average net sales of 11 mboepd in December.

In 2008, we successfully completed our first horizontal well in the Woodford Shale natural gas play in the Anadarko Basin of Oklahoma. We are currently participating in additional horizontal wells in the area where we hold 52,000 net acres. In 2009, we drilled 13 wells, five of which were operated. We plan to drill 10 mmcfd.to 15 wells in 2010.

We also have domestic natural gas operations in Oklahoma, east Texas and north Louisiana, with combined net sales of 121 mmcfd in 2009, and liquid hydrocarbon operations in the Permian Basin of west Texas, with net sales of 8 mbpd in 2009. In June 2009, we completed the sales of our operated and a portion of our outside-operated Permian Basin producing assets in New Mexico and west Texas. We still retain interests in 12 Permian Basin fields.

We hold acreage in two additional emerging shale resource plays in the U.S. In the Appalachian Basin we hold 70,000 net acres in the Marcellus Shale natural gas play in Pennsylvania and West Virginia. We drilled five wells

in 2009 and plan to drill another 8 to 12 wells in 2010. In Louisiana and east Texas, we hold 25,000 net acres in the Haynesville Shale natural gas play, where we drilled one well in 2009. We plan to drill three to four wells in 2010.

Net liquid hydrocarbon and natural gas sales from our Wyoming fields averaged 18 mbpd and 113 mmcfd in 2009. We plan to drill 24 wells in 2010.

Canada – We hold interests in both operated and outside-operated exploration stage in-situ oil sand leases as a result of the acquisition of Western in 2007. The three potential in-situ developments are Namur, in which we hold a 60 percent operated interest, Birchwood, in which we hold a 100 percent operated interest, and Ells River, in which we hold a 20 percent outside-operated interest. Initial test drilling on the Birchwood prospect positively confirmed bitumen presence with additional test drilling required to confirm reservoir quality.

Africa

Equatorial Guinea – We own a 63 percent operated working interest in the Alba field which is offshore Equatorial Guinea. During 2009, net liquid hydrocarbon sales averaged 42 mbpd, or 17 percent of our worldwide net liquid hydrocarbon sales volumes, and net natural gas sales averaged 426 mmcfd, or 45 percent of our worldwide net natural gas sales. Net liquid hydrocarbon sales volumes in 2009 included 30 mbpd of primary condensate.

We also own a 52 percent interest in Alba Plant LLC, an equity method investee that operates an onshore liquefied petroleum gas (“LPG”) processing plant. Alba field natural gas is processed by the LPG plant under a long-term contract at a fixed price for the British thermal units used in the operations of the LPG plant and for the hydrocarbons extracted from the natural gas stream in the form of secondary condensate and LPG. During 2009, a gross 943 mmcfd of natural gas was supplied to the LPG production facility and the resulting net liquid hydrocarbon sales volumes in 2009 included 4 mbpd of secondary condensate and 12 mbpd of LPG produced by Alba Plant LLC.

As part of our Integrated Gas segment, we own 45 percent of Atlantic Methanol Production Company LLC (“AMPCO”) and 60 percent of Equatorial Guinea LNG Holdings Limited (“EGHoldings”), both of which are accounted for as equity method investments. AMPCO operates a methanol plant and EGHoldings operates a liquefied natural gas (“LNG”) production facility, both located on Bioko Island. Dry natural gas from the Alba field, which remains after the condensate and LPG are removed, is supplied to both of these facilities under long-term contracts at fixed prices. Because of the location of and limited local demand for natural gas in Equatorial Guinea, we consider the prices under the contracts with Alba Plant LLC, AMPCO and EGHoldings to be comparable to the price that could be realized from transactions with unrelated parties in this market under the same or similar circumstances. Our share of the income ultimately generated by the subsequent export of secondary condensate and LPG produced by Alba Plant LLC is reflected in our E&P segment. Our share of the income ultimately generated by the subsequent export of methanol produced by AMPCO and LNG produced by EGHoldings is reflected in our Integrated Gas segment as discussed below. During 2009, a gross 115 mmcfd of dry natural gas was supplied to the methanol plant and a gross 647 mmcfd of dry gas was supplied to the LNG production facility. Any remaining dry gas is returned offshore and reinjected back into the Alba field for later production.

We hold a 63 percent operated interest in the Deep Luba and Gardenia discoveries on the Alba Block and we are the operator with a 90 percent interest in the Corona well on Block D. These wells are part of our long-term LNG strategy. We expect these discoveries to be developed when the natural gas supply from the nearby Alba field starts to decline.

Angola –Offshore Angola, we hold 10 percent interests in Block 31 and Block 32, both of which are outside-operated. The discoveries on Blocks 31 and 32 represent four potential development hubs. The Plutao, Saturno, Venus and Marte discoveries and one successful appraisal well form a planned development area in the northeastern portion of Block 31. In 2008, we received approval to proceed with this first deepwater development project, called the PSVM development. The PSVM development will utilize a floating, production, storage and offloading (“FPSO”) vessel. A total of 48 production and injection wells are planned with the drilling of the first three to four development wells planned in 2010. First production is anticipated in late 2011 to early 2012. Other discoveries on Block 31 comprise potential development areas in the southeast and middle portions of the block. Eight of the Block 32 discoveries form a potential development in the eastern area of that block. We expect first production on Block 32 in 2015 or 2016.

Libya – We hold a 16 percent interest in the outside-operated Waha concessions, which encompass almost 13 million acres located in the Sirte Basin. Our exploration program in 2009 included the drilling of four wells. One well is waiting on completion, one was dry and abandoned, and two are currently drilling. We also drilled 5 development wells in Libya during the year. Net liquid hydrocarbon sales in Libya averaged 46 mbpd in 2009. The 2009 net liquid hydrocarbon sales in Libya represented 19 percent of our worldwide net liquid hydrocarbon sales volumes. Net natural gas sales in Libya averaged 4 mmcfd in 2009.

Our Faregh Phase II Gas Plant project is expected to deliver a gross 180 mmcfd of natural gas and 15 mbpd of liquid hydrocarbons into the Libyan domestic market. Commissioning will begin in 2010, with startup planned for first quarter of 2011.

Europe

Norway – Norway is a growing core area, which complements our long-standing operations in the U.K. sector of the North Sea discussed below. We were approved for our first operatorship on the offshore Norwegian continental shelf in 2002, where today we operate eight licenses and hold interests in over 600,000 gross acres.

The operated Alvheim complex located on the Norwegian continental shelf commenced production in June 2008. The complex consists of an FPSO with subsea infrastructure. Improved reliability, combined with optimization work, increased the throughput of the FPSO to 142 mbpd, up from the original design of 120 mbpd. Produced oil is transported by shuttle tanker and produced natural gas is transported to the existing U.K. Scottish Area Gas Evacuation (“SAGE”) system using a 14-inch diameter, 24-mile cross border pipeline. First production to the complex was from the Alvheim development which is comprised of the Kameleon, East Kameleon and Kneler fields, in which we have a 65 percent working interest, and the Boa field, in which we have a 58 percent working interest. At the end of 2009, the Alvheim development included ten producing wells and two water disposal wells. A Phase 2 drilling program targeting three additional production wells, and a Phase 2b drilling program with two additional production wells, is planned in 2010 through 2012. Net sales for 2009 averaged 56 mbpd of liquid hydrocarbons and 30 mmcfd of natural gas.

The nearby outside-operated Vilje field, in which we own a 47 percent working interest, began producing through the Alvheim complex in August 2008. During 2009, net liquid hydrocarbon sales from Vilje averaged 12 mbpd.

In June 2009, we completed the drilling program for the Volund field as a subsea tieback to the Alvheim complex. The Volund development, in which we own a 65 percent operated interest, is located approximately five miles south of the Alvheim area and consists of one production well and one water disposal well. First production from Volund was announced in September 2009. The Volund owners have contracted for 25 gross mbpd (16 mbpd net) firm capacity on the Alvheim FPSO beginning in July 2010. Until that date, Volund will act as a swing producer, filling any available capacity and allowing the FPSO to be fully utilized.

Also offshore Norway, we and our partners announced the Marihone and Viper discoveries, both located within tie-back distance of the Alvheim FPSO. The Marihone oil discovery is located in license PL340 about 12 miles south of the Volund and Alvheim fields. We hold a 65 percent operated working interest in Marihone. The Viper oil discovery is located immediately next to Volund field in PL203, about 12 miles south of the Alvheim FPSO. We are the operator and hold a 65 percent interest in Viper. Conceptual development studies for both discoveries have begun.

In addition, we hold a 28 percent interest in the outside-operated Gudrun field, located 120 miles off the coast of Norway. In January 2009, the operator announced a development concept that includes a fixed processing platform with seven production wells that would be tied to existing facilities on the Sleipner field, and one water disposal well.

United Kingdom – Our largest asset in the U.K. sector of the North Sea is the Brae area complex where we are the operator and have a 42 percent working interest in the South, Central, North and West Brae fields and a 38 percent working interest in the East Brae field. The Brae A platform and facilities host the underlying South Brae field and the adjacent Central and West Brae fields. A two well development program is scheduled in 2010 for West Brae. The North Brae field, which is produced via the Brae B platform, and the East Brae field, which is produced via the East Brae platform, are natural gas condensate fields. The East Brae platform hosts the nearby Braemar field in which we have a 2628 percent working interest. Net liquid hydrocarbon sales from the Brae area

averaged 1211 mbpd in 2008.2009. Net Brae natural gas sales averaged 119101 mmcfd, or 2111 percent of our internationalworldwide net natural gas sales volumes, in 2008.2009.

The strategic location of the Brae platforms along with pipeline and onshore infrastructure has generated third-party processing and transportation business since 1986. Currently, the operators of 28 third-party fields have contracted to use the Brae system. In addition to generating processing and pipeline tariff revenue, this third-party business also has a favorable impact on Brae area operations by optimizing infrastructure usage and extending the economic life of the complex.

The Brae group owns a 50 percent interest in the outside-operated Scottish Area Gas Evacuation (“SAGE”) system. The SAGE pipeline transports natural gas from the Brae area, and the third-party Beryl area, and has a

Index to Financial Statements

total wet natural gas capacity of 1.1 billion cubic feet (“bcf”) per day. The SAGE terminal at St. Fergus in northeast Scotland processes natural gas from the SAGE pipeline and has the capacity for almostas well as approximately 1 bcf per day of third-party natural gas from the Britannia, Atlantic and Cromarty fields.gas.

In the U.K. Atlantic Margin west of the Shetland Islands, we own aan average 30 percent working interest in the outside-operated Foinaven area complex, consisting of a 28 percent working interest in the main Foinaven field, 47 percent working interest in East Foinaven and 20 percent working interest in the T35 and T25 fields. Net sales from the Foinaven fields averaged 1213 mbpd of liquid hydrocarbons and 67 mmcfd of natural gas in 2008.2009. We are upgrading the FPSO which will extend the life of this project through 2021.

We have a 45 percent interest in five exploratory U.K. onshore coal seam gas licenses. Drilling has been completed in five exploration wells in three of the licenses. We also hold a 55 percent operated working interest in 11 blocks awarded in a 2008 bid round. Our interest covers 520,000 gross acres.

NorwayPoland – Norway isWe have recently added a strategicnew opportunity to our portfolio, Poland shale gas. In November we were awarded the 296,000 acre Kwidzyn Block, followed by the 249,000 acre Orzechow Block in December. The five and growing core area, which complements our long-standing operations in the U.K. sector of the North Sea discussed above.a half year exploration phase for each block includes 2D seismic and at least one well. We were approved for our first operatorship onawarded the Norwegian continental shelf in 2002, where today we operate seven licenses, including the PL 505, which was awarded269,000 acre Brodnica Block in January 2009.

The operated Alvheim complex located on the Norwegian continental shelf commenced production2010, and we continue to look for additional opportunities in June 2008. The complex consists ofPoland. We hold a floating production, storage and offloading vessel (“FPSO”) with subsea infrastructure. Produced oil is transported by shuttle tanker and produced natural gas transported to the SAGE system using a new 14-inch diameter, 24-mile cross border pipeline. First production to the complex was from the Alvheim development which is comprised of the Kameleon and Kneler discoveries, in which we have a 65100 percent working interest and operatorship in all three blocks.

Other International

Indonesia – We are the Boa discovery, in which we have a 58 percent working interest. At the end of 2008, the Alvheim development included ten producing wellsoperator and two water disposal wells. The nearby Vilje discovery, in which we own a 47 percent outside-operated working interest, began producing through the Alvheim complex in August 2008. The two Vilje development wells were drilled and completed in 2007. Additionally, in 2007, the Norwegian government approved a plan for development and operation to develop the Volund field as a subsea tie-back to the Alvheim complex. The Volund development will consist of three production wells and one water disposal well, all to be drilled in the 2009 and 2010. The Volund development, in which we own a 65 percent working interest and serve as operator, is expected to begin production in late 2009.

In addition, we hold a 2870 percent outside-operated interest in the Gudrun field,Pasangkayu Block offshore Indonesia. The block is located 120mostly in deep water, predominantly offshore of the island of Sulawesi in the Makassar Strait, directly east of the Kutei Basin production region. The production sharing contract with the Indonesian government was signed in 2006 and we completed 3D seismic acquisition in May 2008. A mandatory 25 percent relinquishment was submitted to the Indonesian government in September 2009 and upon approval, the block size will be reduced from 1.2 million gross acres to 872,400 gross acres. We expect to drill two wells in 2010.

In October 2008, we were granted a 49 percent interest and operatorship in the Bone Bay Block offshore Sulawesi. An increase in ownership to 55 percent is pending Indonesian government approval. The Bone Bay Block covers an area of 1.23 million acres and is 200 miles offsoutheast of our Pasangkayu Block. Current exploration plans for Bone Bay call for the coastacquisition of Norway, whereseismic data starting in 2010, followed by drilling of one exploration well in 2011. In the second quarter of 2009, we were awarded a successful appraisal49 percent interest and operatorship in the Kumawa Block, our third Indonesia offshore exploration block, located offshore West Papua. An increase in ownership to 55 percent is pending Indonesian government approval. The Kumawa Block encompasses 1.24 million acres. A 2D seismic survey is planned in the first quarter of 2010 and we expect to drill one exploration well was drilled in 2006. In January 2009,2011-2012.

We are the operator announcedof a development conceptdrilling rig consortium, with five other operators, that includeshas secured a fixed processing platformdeepwater exploration drilling rig to drill exploratory wells in Indonesia over a two-year period commencing in the second quarter of 2010. The participants have the right to extend this rig contract for up to one additional year.

We continue to participate in joint study agreements in Indonesia, which provide a right of first refusal in future bid rounds. We completed two joint study agreements in 2008 and have one in progress.

Divestitures

Angola –In February 2010, we closed the sale of an undivided 20 percent interest in the outside-operated production sharing contract and joint operating agreement on Block 32 offshore Angola for $1.3 billion, excluding any purchase price adjustments, with seven production wells that would be tied to existing facilities on the Sleipner field. A final investment decision is expectedan effective date of January 1, 2009. We retained a 10 percent interest in 2009.Block 32.

On October 31, 2008,

Gabon –In December 2009, we closed the sale of our non-core,operated properties in Gabon. Net production from these operations averaged 6 mbpd in 2009. The results of our Gabonese operations have been reported as discontinued operations.

United States –In June 2009, we completed the sale of our operated and a portion of our outside-operated interests (24 percentPermian Basin producing assets in New Mexico and west Texas for net proceeds after closing adjustments of Heimdal field, 47 percent$293 million. A $196 million pretax gain on the sale was recorded. Net production from these sold properties averaged 8,150 boepd in the first quarter of Vale field and 20 percent of Skirne field) and associated undeveloped acreage in offshore Norway.2009.

Ireland– In December 2008,April 2009, we announced an agreement to sell our wholly-owned subsidiary which owns our producing properties in Ireland. Closing is subject to customary closing conditions. Properties included inclosed the sale areof our operated properties offshore Ireland, which consisted of our 100 percent working interest in the Kinsale Head, Ballycotton and Southwest Kinsale natural gas fields and our 87 percent operated working interest in the Seven Heads natural gas fieldfield. Net production from these operations averaged 5 mboepd in the Celtic Sea offshore Ireland. Also included is a 100 percent interest in our gas storage business which allows us to provide full third-party storage services from the Southwest Kinsale field.first quarter of 2009.

We own aIn July 2009 we closed the sale of our subsidiary holding our 19 percent working interest in the outside-operated Corrib natural gas development project, located 40 miles off Ireland’s northwest coast, where six of the seven wells necessary to develop the field have been drilled. Fouroffshore Ireland. As a result of these wells were completed and tested at the end of 2008. Terminal construction and offshore pipe installation are currently underway and onshore pipeline installation is planned to commence in 2009. The operator expects first production from the field in late 2010 or early 2011.

Equatorial Guinea – We own a 63 percent operated working interest in the Alba field offshore Equatorial Guinea During 2008, net liquid hydrocarbon sales average 41 mbpd or 28 percent ofdispositions, our international liquid hydrocarbon sales volumes, and net natural gas sales averaged 366 mmcfd, or 64 percent of our international natural gas sales. Net liquid hydrocarbon sales volumes in 2008 included 26 mbpd of condensate.

We also own a 52 percent interest in Alba Plant LLC, an equity method investee that operates an onshore liquefied petroleum gas (“LPG”) processing plant. Alba field natural gas is supplied to the LPG plant under a long-term contract at a fixed price. During 2008, a gross 883 mmcfd of natural gas was supplied to the LPG production facility and our net liquid hydrocarbon sales volumes in 2008 included 11 mbpd of LPG and 4 mbpd of secondary condensate produced by Alba Plant LLC.

Index to Financial Statements

As part of our Integrated Gas segment, we own 45 percent of Atlantic Methanol Production Company LLC (“AMPCO”) and 60 percent of Equatorial Guinea LNG Holdings Limited (“EGHoldings”). AMPCO operates a methanol plant and EGHoldings operates an LNG production facility, both located on Bioko Island. Alba field dry natural gas, which remains after the condensate and LPG are removed, is supplied to both of these facilities under long-term contracts at fixed prices. Because of the location of and limited local demand for natural gas in Equatorial Guinea, we consider the prices under the contracts with Alba Plant LLC, AMPCO and EGHoldings to be comparable to the price that could be realized from transactions with unrelated parties in this market under the same or similar circumstances. Our share of the income ultimately generated by the subsequent export of LPG produced by Alba Plant LLC is reflected in our E&P segment. Our share of the income ultimately generated by the subsequent export of methanol produced by AMPCO and LNG produced by EGHoldings is reflected in our Integrated Gas segment as discussed below. During 2008, a gross 94 mmcfd of dry natural gas was supplied to the methanol plant and a gross 565 mmcfd of dry gas was supplied to the LNG production facility. Any remaining dry gas is returned offshore and reinjected into the Alba reservoir for later production.

Angola – The discoveries on Blocks 31 and 32 represent four potential development hubs. The Plutao, Saturno, Venus and Marte discoveries and one successful appraisal well form a planned development area in the northeastern portion of Block 31. In 2008, we received approval to proceed with this first deepwater development project, called the PSVM development. Key contracts were awarded and construction work commenced in the second half of 2008. A total of 48 production and injection wells are planned for the PSVM development. Other discoveries on Block 31 comprise potential development areas in the southeast and middle portions of the block. Seven of the Block 32 discoveries form a potential development in the eastern area of that block.

Libya – We resumed operations in Libya in 2006, holding a 16 percent outside-operated interest in the Waha concessions. Net liquid hydrocarbon sales in Libya averaged 46 mbpd in 2008 compared to 45 mbpd in 2007. The 2008 net liquid hydrocarbon sales in Libya represented 31 percent of our international liquid hydrocarbon sales volumes. Net natural gas sales in Libya averaged 4 mmcfd in 2008.

Gabon – We are the operator of the Tchatamba South, Tchatamba West and Tchatamba Marin fields offshore Gabon with a 56 percent working interest. Net sales in Gabon averaged 6 mbpd of liquid hydrocarbons in 2008. Production from these three fields is processed on a single offshore facility at Tchatamba Marin, with the processed oil being transported through an offshore and onshore pipeline to an outside-operated storage facility.

Other Matters

During the first quarter of 2008, we relinquished our interest in anIrish exploration and production license in Sudan, andbusinesses have been reported as a result, we no longer have any interests in Sudan.

We ceased efforts to pursue exploration opportunities in Ukraine and closed our Kiev office in the third quarter of 2008.discontinued operations.

The above discussion of the E&P segment includes forward-looking statements with respect to anticipated future exploratory and development drilling, Blocks 31 and 32 offshore Angola, the Equatorial Guinea discoveries, the timing of production from the Woodford Shale resource play, the Droshky and Ozona developments in the Gulf of Mexico, the VolundFaregh Phase II Gas Plant, the PSVM development the sale of a subsidiary which owns producing properties in Irelandon Block 31 offshore Angola and the Corrib project.Block 32 and other possible developments. Some factors which could potentially affect these forward-looking statements include pricing, supply and demand for petroleum products, the amount of capital available for exploration and development, regulatory constraints, drilling rig availability, unforeseen hazards such as weather conditions, natural disasters, acts of war or terrorist acts and the governmental or military response, and other geological, operating and economic considerations. Except for the Volund development, theThe foregoing forward-looking statements may be further affected by the inability to obtain or delay in obtaining necessary government and third-party approvals and permits. The possibleoffshore developments on Blocks 31 and 32 offshore Angola, and the Equatorial Guinea discoveries could further be affected by presently known data concerning size and character of reservoirs, economic recoverability, future drilling success and production experience. Factors that could affect the sale of the subsidiary include customary closing conditions. The foregoing factors (among others) could cause actual results to differ materially from those set forth in the forward-looking statements.

Index to Financial Statements

ReservesProductive and Drilling Wells

AtFor our E&P segment, the following tables set forth productive wells and service wells as of December 31, 2009, 2008 and 2007 and drilling wells as of December 31, 2009.

Gross and Net Wells