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Anadarko Announces Shenandoah Appraisal Well Encounters More Than 1,000 Net Feet of Oil Pay

HOUSTON, TX — (Marketwire) — 03/19/13 — Anadarko Petroleum Corporation (NYSE: APC) today announced its Shenandoah-2 well in the deepwater Gulf of Mexico encountered more than 1,000 net feet of oil pay in multiple high-quality Lower Tertiary-aged reservoirs.

“The successful Shenandoah-2 well marks one of Anadarko–s largest oil discoveries in the Gulf of Mexico, with more than 1,000 net feet of oil pay and reservoir rock and fluid properties of much higher quality than previously encountered by industry in Lower Tertiary discoveries,” said Bob Daniels, Anadarko Sr. Vice President Deepwater and International Exploration. “With ownership in the successful Shenandoah wells, the adjacent Yucatan prospect, and the very encouraging results from the nearby Coronado well, Anadarko is strategically positioned in the Shenandoah Basin, which has the potential to become one of the most prolific new areas in the deepwater Gulf of Mexico.”

The Shenandoah-2 well, located in Walker Ridge block 51, was drilled to a total depth of 31,405 feet in approximately 5,800 feet of water, more than 1 mile southwest and approximately 1,700 feet structurally down-dip from the Shenandoah-1 discovery. Similar to the initial Shenandoah discovery well, log and pressure data from the Shenandoah-2 well indicate excellent-quality reservoir and fluid properties. The well was drilled to test the down-dip extent of the accumulation, and the targeted sands were full to base with no oil-water contact.

“We are incorporating the information obtained from Shenandoah-2 into our planning and anticipate further appraisal drilling to advance this potentially giant project,” Daniels added.

Anadarko is the operator of the Shenandoah-2 well and the previously announced Shenandoah-1 discovery well, located in Walker Ridge block 52, with a 30-percent working interest. Other co-owners in Shenandoah are ConocoPhillips (NYSE: COP) with a 30-percent working interest, Cobalt International Energy L.P. (NYSE: CIE) with a 20-percent working interest, Venari Resources LLC with a 10-percent working interest and Marathon Oil Company (NYSE: MRO) with a 10-percent working interest.

Additionally, in the Shenandoah Basin, Anadarko has a 15-percent working interest in both the Coronado well, located in Walker Ridge block 98, and the Yucatan prospect, located in Walker Ridge block 95.

A map of the Shenandoah Basin in the deepwater Gulf of Mexico will be available under the “Media Center/Anadarko News” tab at .

Anadarko Petroleum Corporation–s mission is to deliver a competitive and sustainable rate of return to shareholders by exploring for, acquiring and developing oil and natural gas resources vital to the world–s health and welfare. As of year-end 2012, the company had approximately 2.56 billion barrels-equivalent of proved reserves, making it one of the world–s largest independent exploration and production companies. For more information about Anadarko and APC Flash Feed updates, please visit .

This news release contains 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. Anadarko believes that its expectations are based on reasonable assumptions. No assurance, however, can be given that such expectations will prove to have been correct. A number of factors could cause actual results to differ materially from the projections, anticipated results or other expectations expressed in this news release, including Anadarko–s ability to successfully drill, complete, test and produce the wells and prospects identified in this news release. See “Risk Factors” in the company–s 2012 Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and other public filings and press releases. Anadarko undertakes no obligation to publicly update or revise any forward-looking statements.

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