POWER OF ATTORNEY
KNOW ALL BY THESE PRESENTS that the undersigned Director of ANADARKO PETROLEUM
CORPORATION (the “Company”), a Delaware corporation, does hereby constitute and appoint JAMES R.
LARSON, DIANE L. DICKEY, and ROBERT K. REEVES, and each of them, his or her true and lawful
attorney and agent to do any and all acts and things and execute any and all instruments which, with the advice of
Counsel, said attorney and agent may deem necessary or advisable to enable the Company to comply with the
Securities Act of 1934, as amended, and any rules, regulations and requirements of the Securities and Exchange
Commission in connection with the filing under said Act of the Form 10-K Annual Report for the Year Ended
December 31, 2004, including specifically, but without limitation thereof, to sign his or her name as a Director of
the Company to the Form 10-K Annual Report for the Year Ended December 31, 2004 filed with the Securities
and Exchange Commission, and to any instrument or document filed as a part of, or in connection with, said
Form 10-K Annual Report for the Year Ended December 31, 2004 or amendment thereto; and the undersigned
does hereby ratify and confirm all that said attorney and agent shall do or cause to be done by virtue thereof.
IN WITNESS WHEREOF, the undersigned have subscribed these presents this 4th day of March, 2005.
/s/ ROBERT J. ALLISON, JR.
/s/ JAMES T. HACKETT
Robert J. Allison, Jr.
James T. Hackett
/s/ CONRAD P. ALBERT
/s/ LARRY BARCUS
Conrad P. Albert
/s/ JAMES L. BRYAN
/s/ JOHN R. BUTLER, JR.
James L. Bryan
John R. Butler, Jr.
/s/ H. PAULETT EBERHART
/s/ PRESTON M. GEREN III
H. Paulett Eberhart
Preston M. Geren III
/s/ JOHN R. GORDON
/s/ JOHN W. PODUSKA, SR.
John R. Gordon
John W. Poduska, Sr.
POWER OF ATTORNEY
KNOW ALL BY