Exhibit 99
CERTIFICATION OF PERIODIC REPORT
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, John N. Seitz, President and Chief Executive Officer of Anadarko Petroleum Corporation (the "Company") and Michael E. Rose, Executive Vice President and Chief Financial Officer of the Company, certify that:
(1) the Quarterly Report on Form 10-Q of the Company for the period ending June 30, 2002, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and
(2) the information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.
August 14, 2002 | /s/ John N. Seitz |
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| John N. Seitz | |
| President and Chief Executive Officer | |
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August 14, 2002 | /s/ Michael E. Rose |
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| Michael E. Rose | |
| Executive Vice President and Chief | |
| Financial Officer |