Anadarko Announces Discovery Offshore Ghana

Anadarko Petroleum Corporation (NYSE:APC) today announced another
significant discovery offshore Ghana at the Owo prospect in the
Deepwater Tano Block. The discovery well encountered approximately 174
net feet of high-quality oil pay in two zones of stacked Turonian-age
reservoir sands contained within a gross vertical reservoir interval of
more than 500 feet. Pressure data indicates that these zones are part of
the same accumulation, and the oil appears to be light crude between 33
and 36 degrees API.

'Building on the success of Jubilee and Tweneboa, Owo marks the
partnership′s third substantial discovery offshore Ghana and continues
to enhance the gross resource potential of this prolific area and
validate the quality of our geologic models,? said Bob Daniels, Anadarko
Sr. Vice President, Worldwide Exploration. 'We plan to continue an
active drilling program offshore Ghana through the end of this year and
into 2011 with multiple appraisal wells planned for both the Tweneboa
field and now the adjacent Owo discovery. In addition, we expect to
resume the westward expansion of our exploration activity in the
Cretaceous Fan play, where we′ve identified more than 30 prospects and
leads with size and geologic characteristics similar to the Jubilee
field across our 8-million-gross-acre position offshore Ghana, Cote
d′Ivoire, Liberia and Sierra Leone.?

The Owo-1 well has been drilled to a total depth of approximately 12,765
feet in about 4,685 feet of water. The partnership plans to sidetrack
the well to further define the sand continuity as well as test a deeper
and laterally offset part of the Owo channel system. Cores are also
planned in the well to provide additional reservoir data needed for a
potential development plan. After the sidetrack is complete, the rig
will be mobilized to drill the Onyina prospect that also is located on
the Deepwater Tano Block.

Anadarko holds an 18-percent working interest in the Deepwater Tano
Block. Tullow Oil is the operator with a 49.95-percent working interest,
and the other co-owners in the discovery are Kosmos Energy (18-percent
working interest), Sabre Oil & Gas (4.05-percent working interest) and
the Ghana National Petroleum Corporation (10-percent carried interest).

A map of the Owo discovery area in the Deepwater Tano Block and the
partnership′s successful drilling activity offshore Ghana 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 2009, the company had approximately 2.3
billion barrels-equivalent of proved reserves, making it one of the
world′s largest independent exploration and production companies. For
more information about Anadarko, 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 and 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 2009 Annual
Report on Form 10-K, Quarterly Report on Form 10-Q for the quarter ended
March 31, 2010 and other public filings and press releases. Readers are
cautioned not to place undue reliance on forward-looking statements,
which speak only as of the date hereof. Anadarko undertakes no
obligation to publicly update or revise any forward-looking statements.