Exhibit 32.1
APACHE OFFSHORE INVESTMENT PARTNERSHIP
Certification of Chief Executive Officer
and Chief Financial Officer
I, G. Steven Farris, certify that the Annual Report of Apache Offshore Investment Partnership on Form 10-K for the year ended December 31, 2005, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. §78m or §78o (d)) and that information contained in such report fairly represents, in all material respects, the financial condition and results of operations of Apache Offshore Investment Partnership.
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| /s/ G. Steven Farris | | |
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| By: | | G. Steven Farris | | |
| Title: | | President, Chief Executive Officer and Chief Operating Officer of Apache Corporation, Managing Partner | | |
Date: October 11, 2006
I, Roger B. Plank, certify that the Annual Report of Apache Offshore Investment Partnership on Form 10-K for the year ended December 31, 2005, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. §78m or §78o (d)) and that information contained in such report fairly represents, in all material respects, the financial condition and results of operations of Apache Offshore Investment Partnership.
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| /s/ Roger B. Plank | | |
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| By: | | Roger B. Plank | | |
| Title: | | Executive Vice President and Chief Financial Officer of Apache Corporation, Managing Partner | | |
Date: October 11, 2006
