UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 10-Q

          [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                      SECURITIES EXCHANGE ACT OF 1934

                  For the Quarterly Period Ended March 31, 2005
                                       OR

          [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                       SECURITIES EXCHANGE ACT OF 1934

          For the Transition Period from ______________ to _____________________

                         Commission File Number 0-13546

                               ------------------

                     APACHE OFFSHORE INVESTMENT PARTNERSHIP
              ----------------------------------------------------
             (Exact Name of Registrant as Specified in Its Charter)

                          Delaware                        41-1464066
           ------------------------------           ---------------------
            (State or Other Jurisdiction of            (I.R.S. Employer
            Incorporation or Organization)          Identification Number)

            Suite 100, One Post Oak Central              77056-4400
         2000 Post Oak Boulevard, Houston, TX            ----------
       ----------------------------------------          (Zip Code)
       (Address of Principal Executive Offices)

       Registrant's Telephone Number, Including Area Code: (713) 296-6000

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

                                   YES [X] NO [ ]



                         PART I - FINANCIAL INFORMATION

ITEM 1 - FINANCIAL STATEMENTS

                     APACHE OFFSHORE INVESTMENT PARTNERSHIP
                        STATEMENT OF CONSOLIDATED INCOME
                                   (UNAUDITED)

FOR THE THREE MONTHS ENDED MARCH 31, --------------------------------- 2005 2004 --------------- --------------- REVENUES: Oil and gas sales $ 3,376,275 $ 3,250,730 Interest income 22,388 6,084 --------------- --------------- 3,398,663 3,256,814 --------------- --------------- EXPENSES: Depreciation, depletion and amortization 567,036 689,206 Asset retirement obligation accretion 12,601 11,922 Lease operating costs 307,921 198,610 Gathering and transportation expense 42,824 34,992 Administrative 107,000 102,000 --------------- --------------- 1,037,382 1,036,730 --------------- --------------- NET INCOME $ 2,361,281 $ 2,220,084 =============== =============== NET INCOME ALLOCATED TO: Managing Partner $ 568,413 $ 564,279 Investing Partners 1,792,868 1,655,805 --------------- --------------- $ 2,361,281 $ 2,220,084 =============== =============== NET INCOME PER INVESTING PARTNER UNIT $ 1,698 $ 1,561 =============== =============== WEIGHTED AVERAGE INVESTING PARTNER UNITS OUTSTANDING 1,055.7 1,060.7 =============== ===============
The accompanying notes to financial statements are an integral part of this statement. 1 APACHE OFFSHORE INVESTMENT PARTNERSHIP STATEMENT OF CONSOLIDATED CASH FLOWS (UNAUDITED)
FOR THE THREE MONTHS ENDED MARCH 31, ---------------------------- 2005 2004 ------------ ----------- CASH FLOWS FROM OPERATING ACTIVITIES: Net income $ 2,361,281 $ 2,220,084 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, depletion and amortization 567,036 689,206 Asset retirement obligation accretion 12,601 11,922 Dismantlement and abandonment cost - (146,222) Changes in operating assets and liabilities: (Increase) decrease in accrued revenues receivable 211,469 18,345 (Increase) decrease in receivable from/payable to Apache Corporation 26,945 (97,855) Increase (decrease) in accrued operating expenses payable 25,033 6,049 ------------ ----------- Net cash provided by operating activities 3,204,365 2,701,529 ------------ ----------- CASH FLOWS FROM INVESTING ACTIVITIES: Additions to oil and gas properties (9,744) (198,621) ------------ ----------- Net cash used in investing activities (9,744) (198,621) ------------ ----------- CASH FLOWS FROM FINANCING ACTIVITIES: Distributions to Investing Partners (4,222,585) (2,121,466) Distributions to Managing Partner (631,006) (581,420) ------------ ----------- Net cash used in financing activities (4,853,591) (2,702,886) ------------ ----------- NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (1,658,970) (199,978) CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 3,333,640 2,271,495 ------------ ----------- CASH AND CASH EQUIVALENTS, END OF PERIOD $ 1,674,670 $ 2,071,517 ============ ===========
The accompanying notes to financial statements are an integral part of this statement. 2 APACHE OFFSHORE INVESTMENT PARTNERSHIP CONSOLIDATED BALANCE SHEET (UNAUDITED)
MARCH 31, DECEMBER 31, 2005 2004 --------------- --------------- ASSETS CURRENT ASSETS: Cash and cash equivalents $ 1,674,670 $ 3,333,640 Accrued revenues receivable 753,852 965,321 Receivable from Apache Corporation 138,529 165,474 --------------- --------------- 2,567,051 4,464,435 --------------- --------------- OIL AND GAS PROPERTIES, on the basis of full cost accounting: Proved properties 184,075,346 184,065,602 Less - Accumulated depreciation, depletion and amortization (176,882,253) (176,315,217) --------------- --------------- 7,193,093 7,750,385 --------------- --------------- $ 9,760,144 $ 12,214,820 =============== =============== LIABILITIES AND PARTNERS' CAPITAL CURRENT LIABILITIES: Accrued operating expenses $ 88,802 $ 63,769 --------------- --------------- 88,802 63,769 --------------- --------------- ASSET RETIREMENT OBLIGATION 870,808 858,207 --------------- --------------- PARTNERS' CAPITAL: Managing Partner 145,029 207,621 Investing Partners (1,055.7 units outstanding) 8,655,505 11,085,223 --------------- --------------- 8,800,534 11,292,844 --------------- --------------- $ 9,760,144 $ 12,214,820 =============== ===============
The accompanying notes to financial statements are an integral part of this statement. 3 APACHE OFFSHORE INVESTMENT PARTNERSHIP NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) The financial statements included herein have been prepared by the Apache Offshore Investment Partnership (the Partnership), without audit, pursuant to the rules and regulations of the Securities and Exchange Commission, and reflect all adjustments which are, in the opinion of management, necessary for a fair statement of the results for the interim periods, on a basis consistent with the annual audited financial statements. All such adjustments are of a normal, recurring nature. Certain information, accounting policies, and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been omitted pursuant to such rules and regulations, although the Partnership believes that the disclosures are adequate to make the information presented not misleading. These financial statements should be read in conjunction with the financial statements and the summary of significant accounting policies and notes thereto included in the Partnership's latest annual report on Form 10-K. 1. RECEIVABLE FROM APACHE CORPORATION The receivable from Apache Corporation, the Partnership's managing partner (Apache or the Managing Partner), represents the net result of the Investing Partners' revenue and expenditure transactions in the current month. Generally, cash in this amount will be paid by Apache to the Partnership in the month after the Partnership's transactions are processed and the net results of operations are determined. 2. RIGHT OF PRESENTMENT As provided in the Partnership Agreement, as amended (the Amended Partnership Agreement), a first right of presentment offer for 2005 of $12,418 per Unit, plus interest to the date of payment, was made to Investing Partners in April 2005, based on a valuation date of December 31, 2004. The Investing Partners had until April 30, 2005 to offer their Units under the current right of presentment, and as of that date, the Partnership had been presented with .25 Units for repurchase under the current offer. 3. ASSET RETIREMENT OBLIGATIONS The Partnership's increase in asset retirement obligations (ARO) liability from December 31, 2004 was attributable to accretion expense of $12,601. 4 ITEM 2 - MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS RESULTS OF OPERATIONS NET INCOME AND REVENUE The Partnership reported net income for the first quarter of 2005 of $2.4 million, up from earnings of $2.2 million in the first quarter 2004. Net income per Investing Partner Unit increased nine percent from a year ago, rising from $1,561 per Unit in the first quarter 2004 to $1,698 per Unit in the current quarter. Higher oil and gas prices in the current period more than offset the impact of lower production and higher operating costs. Total revenue increased four percent from a year ago, rising from $3.3 million in the first quarter of 2004 to $3.4 million in the first quarter of 2005. The Partnership's oil and gas production volume and price information is summarized in the following table (gas volumes presented in thousand cubic feet (Mcf) per day):
FOR THE THREE MONTHS ENDED MARCH 31, -------------------- INCREASE 2005 2004 (DECREASE) -------- ---------- --------- Gas volume - Mcf per day 3,472 3,750 (7%) Average gas price - per Mcf $ 6.71 $ 5.99 12% Oil volume - barrels per day 253 338 (25%) Average oil price - per barrel $ 48.03 $ 35.24 36% Natural gas liquids (NGL) volume - barrels per day 66 48 38% Average NGL price - per barrel $ 30.80 $ 27.54 12%
OIL AND GAS SALES Natural gas sales for the first quarter of 2005 totaled $2.1 million, up three percent from the first quarter of 2004. The Partnership's average realized natural gas price for the first quarter of 2005 increased $.72 per Mcf from the year-earlier period, increasing current sales by approximately $.2 million. Natural gas volumes on a daily basis decreased seven percent from a year ago as a result of natural depletion. Steep declines at Matagorda Island 681/682 and South Timbalier 295 more than offset production added through drilling at Ship Shoal 258/259 in 2004. The Partnership's crude oil sales for the first quarter of 2005 totaled $1.1 million, a one percent increase from the first quarter of 2004. A $12.79 per barrel, or 36 percent, increase in the Partnership's average realized oil price contributed to the increase in oil revenues. Oil production was 25 percent lower than a year ago as a result of natural depletion at South Timbalier 295. The Partnership sold an average of 66 barrels per day of natural gas liquids from processing gas during the first quarter of 2005, a 38 percent increase over 2004. Declines in oil and gas production can be expected in future periods due to natural depletion. Given the small number of producing wells owned by the Partnership, and the fact that offshore wells tend to decline at a faster rate than onshore wells, the Partnership's future production will be subject to more volatility than those companies with more diversified wells and longer-lived properties. OPERATING EXPENSES The Partnership's depreciation, depletion and amortization (DD&A) rate, expressed as a percentage of oil and gas sales, was approximately 17 percent during the first quarter of 2005 compared to 21 percent during the same period in 2004. The decline in rate in 2005 reflected higher prices in the current year and reserve additions from drilling in 2004. During the first quarter, the Partnership recognized $12,601 of accretion expense on the asset retirement obligation. Lease operating expense for the first quarter of 2005 of $.3 million increased 55 percent over the first quarter of 2004. The increase reflected repair and maintenance costs on the North Padre Island 969/976 platform and repair 5 costs at South Pass 83. The North Padre Island 969/976 work included replacement of the platform decking, grating, handrails and gauges, while the South Pass 83 work was primarily for storm-related repairs. Administrative expense increased slightly from the first quarter of 2004. CAPITAL RESOURCES AND LIQUIDITY The Partnership's primary capital resource is net cash provided by operating activities, which totaled $3.2 million for the first three months of 2005. Net cash provided by operating activities in the quarter was up 19 percent from a year ago as a result of increases in oil and gas prices. Future cash flows will be influenced by fluctuations in product prices, production levels and operating costs. The Partnership's future financial condition, results of operations and cash from operating activities will largely depend upon prices received for its oil and natural gas production. A substantial portion of the Partnership's production is sold under market-sensitive contracts. Prices for oil and natural gas are subject to fluctuations in response to changes in supply, market uncertainty and a variety of factors beyond the Partnership's control. These factors include worldwide political instability (especially in the Middle East), the foreign supply of oil and natural gas, the price of foreign imports, the level of consumer demand, and the price and availability of alternative fuels. With natural gas accounting for 64 percent of the Partnership's first quarter 2005 production and 57 percent of total proved reserves at December 31, 2004, on an energy equivalent basis, the Partnership is affected more by fluctuations in natural gas prices than in oil prices. The Partnership's oil and gas reserves and production will also significantly impact future results of operations and cash from operating activities. The Partnership's production is subject to fluctuations in response to remaining quantities of oil and gas reserves, weather, pipeline capacity, consumer demand, mechanical performance and workover, recompletion and drilling activities. Declines in oil and gas production can be expected in future years as a result of normal depletion and the Partnership not participating in acquisition or exploration activities. Based on production estimates from independent engineers and current market conditions, the Partnership expects it will be able to meet its liquidity needs for routine operations in the foreseeable future. The Partnership will reduce capital expenditures and distributions to partners as cash from operating activities decline. In the event that future short-term operating cash requirements are greater than the Partnership's financial resources, the Partnership may seek short-term, interest-bearing advances from the Managing Partner as needed. The Managing Partner, however, is not obligated to make loans to the Partnership. On an ongoing basis, the Partnership reviews the possible sale of lower value properties prior to incurring associated dismantlement and abandonment costs. CAPITAL COMMITMENTS The Partnership's primary needs for cash are for operating expenses, drilling and recompletion expenditures, future dismantlement and abandonment costs, distributions to Investing Partners, and the purchase of Units offered by Investing Partners under the right of presentment. The Partnership had no outstanding debt or lease commitments at March 31, 2005. The Partnership did not have any contractual obligations as of March 31, 2005, other than the liability for dismantlement and abandonment costs of its oil and gas properties. The Partnership has recorded a separate liability for the fair value of this asset retirement obligation as discussed under the discussion of critical accounting policies noted above. The Partnership did not participate in any new drilling or recompletion projects during the first quarter of 2005 and did not have any drilling in progress at December 31, 2004. The Partnership's oil and gas property expenditures during the quarter were primarily for seismic costs. Based on information supplied by the operators of the properties, the Partnership anticipates capital expenditures of approximately $.8 million for the remainder of 2005, primarily for drilling the wells at Ship Shoal 258/259. Such estimates may change based on realized prices, drilling results or changes by the operator to the development plan. On March 17, 2005, the Partnership paid distributions to Investing Partners totaling $4.2 million, or $4,000 per Investing Partner unit. The Partnership made a cash distribution to Investing Partners during the first quarter of 2004 of $2,000 per Investing Partner Unit. The amount of future distributions will be dependent on actual and expected production levels, realized and expected oil and gas prices, expected drilling and recompletion 6 expenditures, and prudent cash reserves for future dismantlement and abandonment costs that will be incurred after the Partnership's reserves are depleted. As provided in the Amended Partnership Agreement, a first right of presentment offer for 2005 of $12,418 per Unit was offered to Investing Partners in April 2005, based on a valuation date of December 31, 2004. The Investing Partners had until April 30, 2005 to offer their Units under the current right of presentment, and as of that date, the Partnership had been presented with .25 Units for repurchase under the current offer. ITEM 3 - QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK The Partnership's major market risk exposure is in the pricing applicable to its oil and gas production. Realized pricing is primarily driven by the prevailing worldwide price for crude oil and spot prices applicable to its natural gas production. Prices received for oil and gas production have been and remain volatile and unpredictable. The Partnership has not used derivative financial instruments or otherwise engaged in hedging activities during 2004 or the first three months of 2005. The information set forth under "Commodity Risk" in Item 7A of the Partnership's Form 10-K for the year ended December 31, 2004, is incorporated by reference. Information about market risks for the current quarter is not materially different. ITEM 4 - CONTROLS AND PROCEDURES G. Steven Farris, the Managing Partner's President, Chief Executive Officer and Chief Operating Officer, and Roger B. Plank, the Managing Partner's Executive Vice President and Chief Financial Officer, evaluated the effectiveness of the Partnership's disclosure controls and procedures as of the end of the period covered by this report. Based on that evaluation and as of the date of that evaluation, these officers concluded that the Partnership's disclosure controls to be effective, providing effective means to insure that information it is required to disclose under applicable laws and regulations is recorded, processed, summarized and reported in a timely manner. Also, no significant changes were made in the Partnership's internal controls over financial reporting during the fiscal quarter ending March 31, 2005 that have materially affected, or are reasonably likely to materially affect, the Partnership's internal control over financial reporting. FORWARD-LOOKING STATEMENTS AND RISK Certain statements in this report, including statements of the future plans, objectives, and expected performance of the Partnership, are forward-looking statements that are dependent on certain events, risks and uncertainties that may be outside the Partnership's control, and which could cause actual results to differ materially from those anticipated. Some of these include, but are not limited to, the market prices of oil and gas, economic and competitive conditions, inflation rates, legislative and regulatory changes, financial market conditions, political and economic uncertainties of foreign governments, future business decisions, and other uncertainties, all of which are difficult to predict. There are numerous uncertainties inherent in estimating quantities of proved oil and gas reserves and in projecting future rates of production and timing of development expenditures. The total amount or timing of actual future production may vary significantly from reserves and production estimates. The drilling of exploratory wells can involve significant risks, including those related to timing, success rates and cost overruns. Lease and rig availability, complex geology and other factors can affect these risks. Fluctuations in oil and gas prices, or a prolonged period of low prices, may substantially adversely affect the Partnership's financial position, results of operations and cash flows. 7 PART II - OTHER INFORMATION ITEM 1. LEGAL PROCEEDINGS None. ITEM 2. CHANGES IN SECURITIES, USE OF PROCEEDS AND ISSUER PURCHASES OF EQUITY SECURITIES None. ITEM 3. DEFAULTS UPON SENIOR SECURITIES None. ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS None. ITEM 5. OTHER INFORMATION None. ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K a. Exhibits 31.1 - Certification of Chief Executive Officer 31.2 - Certification of Chief Financial Officer 32.1 - Certification of Chief Executive Officer and Chief Financial Officer b. Reports filed on Form 8-K - None. 8 SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. APACHE OFFSHORE INVESTMENT PARTNERSHIP By: Apache Corporation, General Partner Dated: May 9, 2005 /s/ Roger B. Plank ------------------------------- Roger B. Plank Executive Vice President and Chief Financial Officer Dated: May 9, 2005 /s/ Thomas L. Mitchell ------------------------------- Thomas L. Mitchell Vice President and Controller (Chief Accounting Officer) EXHIBIT INDEX 31.1 - Certification of Chief Executive Officer 31.2 - Certification of Chief Financial Officer 32.1 - Certification of Chief Executive Officer and Chief Financial Officer


                                                                    EXHIBIT 31.1

                                 CERTIFICATIONS

I, G. Steven Farris, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Apache Offshore
      Investment Partnership;

2.    Based on my knowledge, this quarterly report does not contain any untrue
      statement of a material fact or omit to state a material fact necessary to
      make the statements made, in light of the circumstances under which such
      statements were made, not misleading with respect to the period covered by
      this quarterly report;

3.    Based on my knowledge, the financial statements, and other financial
      information included in this quarterly report, fairly present in all
      material respects the financial condition, results of operations and cash
      flows of the registrant as of, and for, the periods presented in this
      quarterly report;

4.    The registrant's other certifying officer and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal
      control over financial reporting (as defined in Exchange Act Rules
      13a-15(f) and 15d-15(f)) for the registrant and have:

      (a)   Designed such disclosure controls and procedures, or caused such
            disclosure controls and procedures to be designed under our
            supervision, to ensure that material information relating to the
            registrant, including its consolidated subsidiaries, is made known
            to us by others within those entities, particularly during the
            period in which this report is being prepared;

      (b)   Designed such internal control over financial reporting, or caused
            such internal control over financial reporting to be designed under
            our supervision, to provide reasonable assurance regarding the
            reliability of financial reporting and the preparation of financial
            statements for external purposes in accordance with generally
            accepted accounting principles;

      (c)   Evaluated the effectiveness of the registrant's disclosure controls
            and procedures and presented in this report our conclusions about
            the effectiveness of the disclosure controls and procedures, as of
            the end of the period covered by this report based on such
            evaluation; and

      (d)   Disclosed in this report any change in the registrant's internal
            control over financial reporting that occurred during the
            registrant's most recent fiscal quarter that has materially
            affected, or is reasonably likely to materially affect, the
            registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer and I have disclosed, based on
      our most recent evaluation of internal control over financial reporting,
      to the registrant's auditors and the audit committee of the registrant's
      board of directors (or persons performing the equivalent functions):

      (a)   All significant deficiencies and material weaknesses in the design
            or operation of internal control over financial reporting which are
            reasonably likely to adversely affect the registrant's ability to
            record, process, summarize and report financial information ; and

      (b)   Any fraud, whether or not material, that involves management or
            other employees who have a significant role in the registrant's
            internal control over financial reporting.

/s/ G. Steven Farris
- ---------------------------------------------
G. Steven Farris
President, Chief Executive Officer and
Chief Operating Officer
of Apache Corporation, General Partner

Date:  May 9, 2005



                                                                    EXHIBIT 31.2

                                 CERTIFICATIONS

I, Roger B. Plank, certify that:

1.    I have reviewed this quarterly report on Form 10-Q of Apache Offshore
      Investment Partnership;

2.    Based on my knowledge, this quarterly report does not contain any untrue
      statement of a material fact or omit to state a material fact necessary to
      make the statements made, in light of the circumstances under which such
      statements were made, not misleading with respect to the period covered by
      this quarterly report;

3.    Based on my knowledge, the financial statements, and other financial
      information included in this quarterly report, fairly present in all
      material respects the financial condition, results of operations and cash
      flows of the registrant as of, and for, the periods presented in this
      quarterly report;

4.    The registrant's other certifying officer and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal
      control over financial reporting (as defined in Exchange Act Rules
      13a-15(f) and 15d-15(f)) for the registrant and have:

      (a)   Designed such disclosure controls and procedures, or caused such
            disclosure controls and procedures to be designed under our
            supervision, to ensure that material information relating to the
            registrant, including its consolidated subsidiaries, is made known
            to us by others within those entities, particularly during the
            period in which this report is being prepared;

      (b)   Designed such internal control over financial reporting, or caused
            such internal control over financial reporting to be designed under
            our supervision, to provide reasonable assurance regarding the
            reliability of financial reporting and the preparation of financial
            statements for external purposes in accordance with generally
            accepted accounting principles;

      (c)   Evaluated the effectiveness of the registrant's disclosure controls
            and procedures and presented in this report our conclusions about
            the effectiveness of the disclosure controls and procedures, as of
            the end of the period covered by this report based on such
            evaluation; and

      (d)   Disclosed in this report any change in the registrant's internal
            control over financial reporting that occurred during the
            registrant's most recent fiscal quarter that has materially
            affected, or is reasonably likely to materially affect, the
            registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer and I have disclosed, based on
      our most recent evaluation of internal control over financial reporting,
      to the registrant's auditors and the audit committee of the registrant's
      board of directors (or persons performing the equivalent functions):

      (a)   All significant deficiencies and material weaknesses in the design
            or operation of internal control over financial reporting which are
            reasonably likely to adversely affect the registrant's ability to
            record, process, summarize and report financial information; and

      (b)   Any fraud, whether or not material, that involves management or
            other employees who have a significant role in the registrant's
            internal control over financial reporting.

/s/ Roger B. Plank
- -----------------------------------------------------
Roger B. Plank
Executive Vice President and Chief Financial Officer
of Apache Corporation, General Partner

Date:  May 9, 2005



                                                                    EXHIBIT 32.1

                     APACHE OFFSHORE INVESTMENT PARTNERSHIP
                     BY APACHE CORPORATION, GENERAL PARTNER

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                           AND CHIEF FINANCIAL OFFICER

      I, G. Steven Farris, certify that the Quarterly Report of Apache Offshore
Investment Partnership on Form 10-Q for the quarterly period ending March 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. Section 78m or Section 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.

/s/ G. Steven Farris
- --------------------------------------------
By:    G. Steven Farris
Title: President, Chief Executive Officer
       and Chief Operating Officer of
       Apache Corporation, General Partner

      I, Roger B. Plank, certify that the Quarterly Report of Apache Offshore
Investment Partnership on Form 10-Q for the quarterly period ending March 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. Section 78m or Section 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.

/s/ Roger B. Plank
- ------------------------------------
By:    Roger B. Plank
Title: Executive Vice President
       and Chief Financial Officer of
       Apache Corporation, General Partner