APACHE CORP
S-3, 1995-08-28
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 28, 1995.
 
                                                      REGISTRATION NO. 33-
===============================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ---------------------
                                    FORM S-3
 
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                             ---------------------
                               APACHE CORPORATION
             (Exact name of registrant as specified in its charter)
 
<TABLE>
<S>                              <C>                                     <C>
          DELAWARE                      ONE POST OAK CENTRAL               NO. 41-0747868   
(State or other jurisdiction     2000 Post Oak Boulevard, Suite 100       (I.R.S. Employer  
    of incorporation or              Houston, Texas 77056-4400           Identification No.) 
       organization)                       (713) 296-6000          
                              
                         (Address, including zip code, and telephone number,
                  including area code, of registrant's principal executive offices)
</TABLE>
 
                               Z. S. KOBIASHVILI
                       VICE PRESIDENT AND GENERAL COUNSEL
                              ONE POST OAK CENTRAL
                       2000 POST OAK BOULEVARD, SUITE 100
                           HOUSTON, TEXAS 77056-4400
                                 (713) 296-6000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                                   COPIES TO:
 
<TABLE>
            <S>                                             <C>
              WILLIAM N. FINNEGAN, IV                                R. JOEL SWANSON
              ANDREWS & KURTH L.L.P.                              BAKER & BOTTS, L.L.P.
               TEXAS COMMERCE TOWER                          ONE SHELL PLAZA, 910 LOUISIANA
               HOUSTON, TEXAS 77002                             HOUSTON, TEXAS 77002-4995
                  (713) 220-4200                                     (713) 229-1234
</TABLE>
 
     Approximate date of commencement of proposed sale to the public: As soon as
practicable after this Registration Statement becomes effective.
 
     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  / /
 
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  / /
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / /
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  / /
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / /
                             ---------------------
                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
===================================================================================================================
                                                       PROPOSED MAXIMUM      PROPOSED MAXIMUM
TITLE OF EACH CLASS OF                AMOUNT TO BE    OFFERING PRICE PER    AGGREGATE OFFERING        AMOUNT OF
SECURITIES TO BE REGISTERED          REGISTERED(1)        SHARE(2)                PRICE(2)        REGISTRATION FEE
-------------------------------------------------------------------------------------------------------------------
<S>                                  <C>                  <C>                 <C>                    <C>
Common Stock, par value
  $1.25 per share(3)...............  7,820,000 Shares       $26.75            $209,185,000            $72,133
===================================================================================================================
</TABLE>
 
(1) Includes 1,020,000 shares subject to the over-allotment option granted to
     the Underwriters.
(2) Estimated pursuant to Rule 457(c) solely for the purpose of calculating the
     registration fee based on the average of the high and low reported sales
     prices for August 24, 1995, as reported on The New York Stock Exchange,
     Inc. Composite Transactions Reporting System.
(3) Including associated common stock purchase rights.
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
***************************************************************************
*                                                                         *
*  INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A  *
*  REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED     *
*  WITH THE SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT  *
*  BE SOLD NOR MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE        *
*  REGISTRATION STATEMENT BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT    *
*  CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY     *
*  NOR SHALL THERE BE ANY SALE OF THESE SECURITIES IN ANY STATE IN WHICH  *
*  SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO            *
*  REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH    *
*  STATE.                                                                 *
*                                                                         *
***************************************************************************

 
                             SUBJECT TO COMPLETION
                  PRELIMINARY PROSPECTUS DATED AUGUST 28, 1995
 
PROSPECTUS
 
                                6,800,000 SHARES
 
                            [APACHE CORPORATION LOGO]
                                  COMMON STOCK
                            ------------------------
 
     All 6,800,000 shares of Common Stock, par value $1.25 per share (the
"Common Stock"), offered hereby (the "Shares") are being sold by Apache
Corporation ("Apache" or the "Company"). The Common Stock is listed on the New
York Stock Exchange (the "NYSE") under the trading symbol "APA." On August 24,
1995, the last reported sale price of the Common Stock as reported on the NYSE
was $26 5/8 per share. See "Price Range of Common Stock and Dividends."
 
      SEE "RISK FACTORS" AT PAGE 9 FOR CERTAIN CONSIDERATIONS RELEVANT TO AN
INVESTMENT IN THE COMMON STOCK.
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
 AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS
   THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
    COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
     PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
=============================================================================================
                                        PRICE TO           UNDERWRITING          PROCEEDS TO
                                         PUBLIC             DISCOUNT(1)          COMPANY(2)
---------------------------------------------------------------------------------------------
<S>                               <C>                  <C>                  <C>
Per Share.........................           $                   $                    $
---------------------------------------------------------------------------------------------
Total(3)..........................           $                   $                    $
=============================================================================================
</TABLE>
 
(1) The Company has agreed to indemnify the several Underwriters against certain
    liabilities under the Securities Act of 1933. See "Underwriting."
 
(2) Before deducting expenses payable by the Company estimated at $450,000.
 
(3) The Company has granted the several Underwriters a 30-day option to purchase
    up to an additional 1,020,000 shares to cover over-allotments, if any. If
    all such shares are purchased, the total Price to Public, Underwriting
    Discount and Proceeds to Company would be $          , $          and
    $          , respectively. See "Underwriting."
 
                            ------------------------
 
     The Shares are offered by the several Underwriters, subject to prior sale,
when, as and if issued to and accepted by them, subject to approval of certain
legal matters by counsel for the Underwriters and certain other conditions. The
Underwriters reserve the right to withdraw, cancel or modify such offer and to
reject orders in whole or in part. It is expected that delivery of certificates
for the Shares will be made in New York, New York on or about                  ,
1995.
 
                            ------------------------
 
MERRILL LYNCH & CO.                                    DEAN WITTER REYNOLDS INC.
                            ------------------------
 
            The date of this Prospectus is                  , 1995.
<PAGE>   3
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMPANY'S
COMMON STOCK AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK STOCK EXCHANGE, THE
CHICAGO STOCK EXCHANGE OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
 
                     INFORMATION INCORPORATED BY REFERENCE
 
     The following documents previously filed by the Company with the Securities
and Exchange Commission (the "Commission") pursuant to the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), (Commission File No. 1-4300) are
incorporated in and made a part of this Prospectus:
 
     (i)    Annual Report on Form 10-K/A for the fiscal year ended December 31,
            1994, filed August 2, 1995.
 
     (ii)   Quarterly Report on Form 10-Q/A for the quarter ended March 31,
            1995, filed August 4, 1995.
    
     (iii)  Quarterly Report on Form 10-Q for the quarter ended June 30, 1995,
            filed August 14, 1995.
 
     (iv)   Current Report on Form 8-K dated March 1, 1995, amended by Amendment
            No. 1 on Form 8-K/A, filed March 22, 1995.
 
     (v)    Current Report on Form 8-K/A dated May 17, 1995, filed July 17, 
            1995.
 
     (vi)   Current Report on Form 8-K dated June 30, 1995, filed July 24, 1995.
 
     (vii)  Registration Statement on Form 8-A dated January 21, 1986, for the
            Common Stock purchase rights issued under the Company's Rights
            Agreement dated January 10, 1986.
 
     All documents which the Company files pursuant to Section 13(a), 13(c), 14
or 15(d) of the Exchange Act subsequent to the date of this Prospectus and prior
to the termination of the offering described herein (the "Offering") shall be
deemed to be incorporated by reference herein and to be a part hereof from the
date of filing of such reports and documents. Any statement contained in a
document incorporated by reference, or deemed to be incorporated by reference,
shall be deemed to be modified or superseded for purposes of this Prospectus to
the extent that a statement contained herein or in any other subsequently filed
document or in any accompanying prospectus supplement modifies or supersedes
such statement. Any such statement so modified or superseded shall not be
deemed, except as so modified or superseded, to constitute a part of this
Prospectus.
 
     The Company will provide without charge to each person to whom this
Prospectus is delivered, upon written or oral request, a copy of any or all
documents described above (other than exhibits thereto, unless such exhibits are
specifically incorporated by reference into the documents that this Prospectus
incorporates by reference). Requests should be addressed to Apache Corporation,
One Post Oak Central, 2000 Post Oak Boulevard, Suite 100, Houston, Texas
77056-4400, Attention: Corporate Secretary (telephone (713) 296-6000).
 
                                        2
<PAGE>   4
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by reference to the more
detailed information and the financial statements (including the notes thereto)
appearing elsewhere in this Prospectus or incorporated by reference in this
Prospectus. Unless otherwise indicated, information in this Prospectus assumes
that the Underwriters' over-allotment option will not be exercised. See
"Underwriting." Unless otherwise indicated, the information in this Prospectus
includes the effects of (i) the acquisition on March 1, 1995 of certain U.S. oil
and gas properties from Texaco Exploration and Production Inc. ("Texaco") from
and after the acquisition date, and (ii) the restatement of the Company's
financial, operating and reserve information to include DEKALB Energy Company
("DEKALB") on a combined basis effective for all periods as a result of the
Company's May 17, 1995 acquisition of DEKALB, which was accounted for as a
pooling of interests. Investors should carefully consider the information set
forth under the heading "Risk Factors."
 
                                  THE COMPANY
OVERVIEW
 
     Apache Corporation, a Delaware corporation formed in 1954, is an
independent energy company that explores for, develops, produces, gathers,
processes and markets crude oil and natural gas. In North America, Apache's
exploration and production interests are spread over 15 states and two Canadian
provinces, focusing on the Gulf of Mexico, the Anadarko Basin, the Permian
Basin, the Gulf Coast, the Rocky Mountains and the Western Sedimentary Basin of
Canada. Outside of North America, Apache has exploration and production
interests offshore Western Australia and exploration interests in Egypt and
Indonesia and offshore China and the Ivory Coast. Apache's Common Stock has been
listed on the NYSE since 1969 and on the Chicago Stock Exchange (the "CSE")
since 1960.
 
     As of December 31, 1994, on a pro forma basis giving effect to the
completed Texaco and DEKALB transactions and the pending Aquila acquisition
(discussed below), and net of completed and pending property dispositions in
1995, the Company's estimated proved reserves were 420 MMboe, of which
approximately 62% was natural gas.
 
     Apache's growth strategy is to increase reserves, production and cash flow
through a combination of acquisitions, moderate-risk drilling and development of
its inventory of existing projects. The Company emphasizes reducing operating
costs and selling marginal and non-strategic properties. An emerging aspect of
Apache's strategy is its exploration and development activity in the
international arena in pursuit of larger reserve targets than are generally
available domestically. Several recent discoveries abroad have created an
inventory of development projects to be drilled in the next several years.
 
     Property acquisition is only one phase in a continuing cycle of Apache's
business growth. Apache's objective is to follow each material acquisition with
a cycle of reserve enhancement, property consolidation and cash flow
acceleration, facilitating asset growth and debt reduction. This approach
requires well-planned and carefully executed property development and a
commitment to a selective program of ongoing property dispositions. Apache
targets acquisitions that have ascertainable additional reserve potential to
which it applies an active drilling, workover and recompletion program to
realize the potential of the undeveloped and partially developed properties. In
1994, the Company replaced over 114% of U.S. production through its drilling,
workover and recompletion program. Apache prefers to operate its properties so
that it can more efficiently influence their development and currently operates
properties accounting for over 75% of its current production.
 
                                        3
<PAGE>   5
 
RECENT DEVELOPMENTS
 
     On August 28, 1995, the Company entered into a purchase and sale agreement
with Aquila Energy Resources Corporation ("Aquila"), a wholly owned, indirect
subsidiary of UtiliCorp United Inc. ("UtiliCorp"), to acquire substantially all
the assets of Aquila (the "Aquila Assets") for approximately $198 million,
subject to certain adjustments. The oil and gas properties included in the
Aquila Assets are located primarily in the Anadarko Basin, the Gulf of Mexico
and the Permian Basin, in many cases in close proximity to existing Apache
properties. These properties are concentrated, with the largest seven fields
representing approximately three quarters of proved reserves and the largest 15
fields representing more than 90% of proved reserves. Five of the largest seven
fields are operated by Aquila. Based on information provided to the Company by
Aquila, the Aquila Assets represented estimated proved reserves of approximately
26 MMboe at December 31, 1994. The composition of the estimated proved reserves
included in the Aquila Assets was approximately 77% gas at December 31, 1994.
The Aquila Assets also include a favorable long-term gas sales contract at
escalating prices, with an allocated value under the purchase agreement of $28.7
million. The Company intends to finance the acquisition of the Aquila Assets
with a portion of the net proceeds of the Offering and a deferred tax-free,
like-kind exchange of properties.
 
     The Company has consummated two other significant acquisitions in 1995. On
March 1, 1995, the Company purchased certain U.S. oil and gas properties from
Texaco for an adjusted purchase price of $564 million, effective as of January
1, 1995. The Texaco properties comprised estimated proved reserves at the
effective date of 105 MMboe (after adjustment for the exercise of preferential
rights and properties excluded following due diligence, and using unescalated
prices), of which approximately 70% was oil. Prior to the time of purchase, the
average daily production of the acquired properties was approximately 20 Mbbls
of oil and 85 MMcf of gas. On May 17, 1995, Apache acquired DEKALB, an oil and
gas company engaged in the exploration for, and the development of, crude oil
and natural gas in Canada, pursuant to a merger agreement under which Apache
issued 8.4 million shares of Common Stock in exchange for all outstanding DEKALB
capital stock and DEKALB employee stock options outstanding at the time of the
merger and tendered to Apache. At year-end 1994, DEKALB's estimated proved
reserves, located almost entirely in Canada, were 300 Bcf of natural gas and 11
MMbbls of hydrocarbon liquids, or a total of 61 MMboe.
 
     During the first half of 1995, Apache received $73 million from completed
dispositions of oil and gas properties as part of its previously announced plans
to sell lower-margin and non-strategic properties. On July 18, 1995, Apache
entered into an agreement for the disposition of certain of its Rocky Mountain
properties to Citation 1994 Investment Limited Partnership ("Citation") for
consideration of $155 million, subject to adjustment. The assets subject to such
agreement include Apache's interest in 138 fields with approximately 1,600
active wells located in Colorado, Montana, North Dakota, South Dakota, Utah and
Wyoming, with average daily production of approximately 9 Mbbls of oil and 9
MMcf of natural gas. Estimated proved reserves attributable to completed and
pending property dispositions in 1995 were 41 MMboe at December 31, 1994.
 
                                        4
<PAGE>   6
 
SUMMARY PRO FORMA OIL AND GAS RESERVE INFORMATION
 
     The following table sets forth summary pro forma information with respect
to the Company's estimated proved oil and gas reserves as of December 31, 1994,
giving effect to the completed DEKALB and Texaco transactions, the pending
Aquila acquisition and certain completed and pending dispositions of
non-strategic properties in 1995. The reserve information below is based on
estimates calculated as of December 31, 1994 and does not reflect production and
revisions since December 31, 1994 or changes in oil and gas prices, changes in
expectations of developing and producing proved undeveloped reserves (including
offshore), changes in marketing expectations and access to markets or changes in
estimates of recoverable reserves resulting from price changes. The reserves
attributable to the completed DEKALB and Texaco acquisitions and the pending
Aquila acquisition were not owned by the Company on such date. The Company has
made other acquisitions and dispositions of property interests during 1995 which
in the aggregate are not material. All estimates of oil and gas reserves are
subject to significant uncertainty. See "Risk Factors."
 
<TABLE>
<CAPTION>
                                        APACHE AND                                1995           TOTAL
                                        DEKALB(1)    TEXACO(2)   AQUILA(3)   DISPOSITIONS(4)     PROVED
                                        ----------   ---------   ---------   ---------------   ----------
<S>                                     <C>          <C>         <C>         <C>               <C>
Oil and natural gas liquids (Mbbls)....    110,624      73,597       6,035         29,166         161,090
Natural gas (MMcf).....................  1,316,155     186,495     120,857         68,351       1,555,156
Equivalent reserves (Mboe).............    329,983     104,680      26,178         40,558         420,283
Present value of estimated future net
  cash flows, before income taxes,
  discounted at 10% (in thousands)..... $1,600,927   $ 368,518   $ 110,120      $ 149,650      $1,929,915
</TABLE>
 
---------------
 
(1) The Company acquired DEKALB by merger effective May 17, 1995.
 
(2) On March 1, 1995, the Company acquired certain properties from Texaco,
    effective January 1, 1995.
 
(3) The Company proposes to acquire certain properties from Aquila effective
    concurrently with and conditioned on the consummation of the Offering.
    Netherland, Sewell & Associates, Inc. ("Netherland, Sewell") estimated
    reserves owned by Aquila as of December 31, 1994. Since that time, Aquila
    has acquired additional property interests included in the amounts set forth
    above. Netherland, Sewell has estimated total proved reserves of Aquila as
    of December 31, 1994 in the approximate amounts of 2,781 Mbbls of oil,
    106,535 MMcf of gas (totaling 20,537 Mboe) and $92 million of present value
    of estimated future net cash flows, before income taxes, discounted at 10%
    (which amounts exclude the properties acquired by Aquila in 1995).
 
(4) The reserves shown give effect to the pending disposition of certain Rocky
    Mountain properties valued at approximately $155 million, the sale of $20
    million in properties on April 1, 1995, the sale of $31 million in
    properties on May 1, 1995, and other smaller sales.
 
                                        5
<PAGE>   7
 
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Shares of Common Stock offered...............  6,800,000 shares
Shares of Common Stock to be outstanding
  after the Offering(1)......................  76,714,519 shares
Use of Proceeds..............................  To provide a portion of the funds to acquire
                                               the Aquila Assets and to reduce amounts
                                               outstanding under the Company's principal
                                               revolving credit facility. The Company may
                                               subsequently reborrow under the facility to
                                               finance future acquisitions of additional oil
                                               and gas properties or for other corporate
                                               purposes. See "Use of Proceeds" and
                                               "Management's Discussion and Analysis of
                                               Financial Condition and Results of
                                               Operations."
NYSE Symbol..................................  APA
</TABLE>
 
---------------
 
(1)  Based on shares outstanding as of June 30, 1995. Does not include the
     following shares of Common Stock reserved for issuance (subject to
     adjustment): 2,777,778 shares issuable on conversion of the 3.93%
     convertible notes at $27.00 per share; 5,622,555 shares issuable on
     conversion of the 6% Convertible Subordinated Debentures due 2002 at $30.68
     per share; 122,606 shares reserved for the dividend reinvestment plan with
     respect to the Common Stock; 400,000 shares reserved for the
     retirement/401(k) savings plan; and 3,411,200 shares reserved under
     existing employee stock option plans, including 911,197 shares issuable on
     the exercise of employee stock options outstanding as of June 30, 1995 and
     362,400 shares issuable on the exercise of employee stock options granted
     August 23, 1995. Does not include 2,000,000 shares of Common Stock issuable
     from time to time in connection with the Company's private merger program.
     The Company currently has a policy of reserving one share of Common Stock
     for each share outstanding or otherwise reserved to provide for any
     issuances under the Company's Rights Agreement.
 
     Quantities of natural gas are expressed in terms of thousand cubic feet
("Mcf"), million cubic feet ("MMcf") or billion cubic feet ("Bcf"). Oil (which
includes condensate) is quantified in terms of barrels ("bbls"), thousands of
barrels ("Mbbls") or millions of barrels ("MMbbls"). One barrel of oil is the
energy equivalent of six Mcf of natural gas, expressed as a barrel of oil
equivalent ("boe"). Natural gas is compared to oil in terms of thousand barrels
of oil equivalents ("Mboe") and in million barrels of oil equivalents ("MMboe").
Oil and natural gas liquids are compared with natural gas in terms of million
cubic feet equivalent ("MMcfe") and billion cubic feet equivalent ("Bcfe").
Daily oil and gas production is expressed in terms of barrels of oil per day
("bopd") and thousands of cubic feet per day ("Mcfd"), respectively. The
Company's "net" working interest in wells or acreage is determined by
multiplying gross wells or acreage by the Company's working interest therein.
Unless otherwise specified, all references to wells and acres are gross.
 
                                        6
<PAGE>   8
 
           SUMMARY CONSOLIDATED FINANCIAL, OPERATING AND RESERVE DATA
 
     The following sets forth certain information regarding Apache's
consolidated results of operations, financial position and operating and reserve
data as of and for the periods indicated. On May 17, 1995, Apache acquired
DEKALB through a merger which was accounted for under the pooling of interests
method. As a result, the financial, operating and reserve data presented below
has been restated to present Apache and DEKALB on a combined basis, including
certain conforming adjustments to depreciation, depletion and amortization and
income taxes. The data presented below should be read in conjunction with the
Company's consolidated financial statements and the notes thereto incorporated
by reference in this Prospectus. The following financial information is not
necessarily indicative of future results of the Company. See also "Selected
Consolidated Financial, Operating and Reserve Data."
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED DECEMBER 31,
                                                         ----------------------------------------
                                                            1994           1993         1992(1)
                                                         ----------     ----------     ----------
                                                         (DOLLARS IN THOUSANDS, EXCEPT PER SHARE
                                                                         AMOUNTS)
<S>                                                      <C>            <C>            <C>
INCOME STATEMENT DATA:
  Oil and gas production revenues......................  $  538,389     $  481,848     $  453,835
  Consolidated revenues................................     592,626        512,632        517,403
  Net income (loss)....................................      45,583         46,755        (15,682)
  Net income (loss) per common share...................         .65            .75           (.28)
  Cash dividends per common share(2)...................         .28            .28            .28
CASH FLOW DATA:
  Net income (loss) from continuing operations.........  $   45,583     $   41,421     $  (14,632)
  Depreciation, depletion and amortization.............     257,821        198,320        179,876
  Impairments..........................................       7,300         23,200         65,320
  Amortization of deferred loan costs..................       3,987          3,896          3,888
  Provision for deferred income taxes..................      24,385         20,539           (998)
  Gain on sale of investment in affiliate..............          --             --        (30,259)
  Change in working capital and other..................      18,693        (31,385)        19,758
                                                         ----------     ----------     ----------
       Net cash provided by operating activities.......  $  357,769     $  255,991     $  222,953
                                                          =========      =========      =========
BALANCE SHEET DATA (period end):
  Working capital (deficit)............................  $   (3,203)    $  (55,538)    $  (32,775)
  Total assets.........................................   2,036,627      1,759,203      1,774,767
  Long-term debt.......................................     719,033        504,334        524,098
  Shareholders' equity.................................     891,087        868,596        554,524
PRODUCTION DATA:
  Oil (Mbbls)..........................................      13,815         13,036         13,465
  Natural gas (MMcf)...................................     176,397        131,591        119,962
  Natural gas liquids (Mbbls)..........................         724            733            885
  Equivalent production (Mboe).........................      43,939         35,701         34,344
AVERAGE SALES PRICE:
  Oil (per bbl)........................................  $    15.65     $    16.74     $    18.11
  Natural gas (per Mcf)................................        1.78           1.94           1.66
  Natural gas liquids (per bbl)........................       11.28          11.55          11.79
RESERVE DATA-PROVED (period end):
  Oil and natural gas liquids (Mbbls)..................     110,624        102,957         94,643
  Natural gas (MMcf)...................................   1,316,155      1,125,630        919,642
  Equivalent reserves (Mboe)...........................     329,983        290,562        247,917
  Present value of estimated future net cash flows,
     before income taxes, discounted at 10%............  $1,600,927     $1,626,096     $1,272,952
</TABLE>
 
---------------
(See notes on following page)
 
                                        7
<PAGE>   9
 
<TABLE>
<CAPTION>
                                                     THREE MONTHS                 SIX MONTHS
                                                    ENDED JUNE 30,              ENDED JUNE 30,
                                               ------------------------    ------------------------
                                               1995(3)(4)       1994       1995(3)(4)       1994
                                               ----------    ----------    ----------    ----------
                                                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                            <C>           <C>           <C>           <C>
INCOME STATEMENT DATA:
  Oil and gas production revenues............  $  174,519    $  134,440    $  317,708    $  259,418
  Consolidated revenues......................     206,052       147,054       373,770       279,775
  Net income.................................         537        12,907         4,620        21,132
  Net income per common share................         .01           .19           .07           .30
  Cash dividends per common share(2).........         .07           .07           .14           .14
CASH FLOW DATA:
  Net income from continuing operations......  $      537    $   12,907    $    4,620    $   21,132
  Depreciation, depletion and amortization
     ........................................      78,830        61,969       148,625       122,226
  Impairments................................          --         2,800            --         6,300
  Amortization of deferred loan costs........       1,150           965         2,373         1,744
  Provision for deferred income taxes........      17,358         7,721        19,773        12,252
  Change in working capital and other........     (21,165)       (6,587)      (34,152)      (22,964)
                                               ----------    ----------    ----------    ----------
       Net cash provided by operating
          activities.........................  $   76,710    $   79,775    $  141,239    $  140,690
                                                =========     =========     =========     =========
BALANCE SHEET DATA (period end):
  Working capital (deficit)..................  $   21,511    $  (19,685)   $   21,511    $  (19,685)
  Total assets...............................   2,554,557     1,823,797     2,554,557     1,823,797
  Long-term debt.............................   1,207,913       578,181     1,207,913       578,181
  Shareholders' equity.......................     890,542       876,978       890,542       876,978
PRODUCTION DATA:
  Oil (Mbbls)................................       5,122         3,381         9,152         6,690
  Natural gas (MMcf).........................      54,361        41,830       104,159        81,321
  Natural gas liquids (Mbbls)................         174           186           365           364
  Equivalent production (Mboe)...............      14,356        10,539        26,878        20,607
AVERAGE SALES PRICE:
  Oil (per bbl)..............................  $    17.48    $    15.98    $    17.20    $    14.42
  Natural gas (per Mcf)......................        1.52          1.87          1.50          1.96
  Natural gas liquids (per bbl)..............       12.19         11.09         12.14         10.61
</TABLE>
 
---------------
 
(1) Includes a $40.6 million after-tax writedown of DEKALB's oil and gas
     properties and a $25.6 million after-tax loss from the sale of
     substantially all of DEKALB's U.S. assets. Also includes a $19.8 million
     after-tax gain resulting from the sale by the Company of its 36.67%
     interest in Natural Gas Clearinghouse.
 
(2) No cash dividends were paid on outstanding DEKALB common stock in 1995,
     1994, 1993 or 1992.
 
(3) The three months and six months ended June 30, 1995 include the effect of
     the acquisition of properties from Texaco on March 1, 1995.
 
(4) Includes nonrecurring transaction costs totaling $8.7 million after tax
     relating to the DEKALB merger.
 
                                        8
<PAGE>   10
 
                                  RISK FACTORS
 
     Prospective investors should carefully review the following factors
together with the other information contained in this Prospectus prior to making
an investment decision.
 
EFFECT OF VOLATILE PRODUCT PRICES
 
     The Company's future financial condition and results of operations will
depend upon the prices received for the Company's oil and natural gas production
and the costs of acquiring, finding, developing and producing reserves. Prices
for oil and natural gas are subject to fluctuations in response to relatively
minor changes in supply, market uncertainty and a variety of additional factors
that are beyond the control of the Company. These factors include worldwide
political instability (especially in the Middle East and other oil-producing
regions), the foreign supply of oil and gas, the price of foreign imports, the
level of consumer product demand, government regulations and taxes, the price
and availability of alternative fuels and the overall economic environment. A
substantial or extended decline in oil and gas prices would have a material
adverse effect on the Company's financial position, results of operations,
quantities of oil and gas that may be economically produced and access to
capital. In addition, the sale of the Company's production depends upon a number
of factors beyond the Company's control, including the availability and capacity
of transportation and processing facilities.
 
     Oil and natural gas prices have historically been volatile and are likely
to continue to be volatile in the future. Such volatility makes it difficult to
estimate the value of producing properties for acquisition and to budget and
project the return on exploration and development projects involving the
Company's producing properties. In addition, unusually volatile prices often
disrupt the market for oil and gas properties, as buyers and sellers have more
difficulty agreeing on the purchase price of properties.
 
     The Company engages in hedging activities with respect to some of its
projected oil and gas production through a variety of financial arrangements
designed to protect against price declines, including swaps, collars and futures
agreements. To the extent that Apache engages in such activities, it may be
prevented from realizing the benefits of price increases above the levels of the
hedges. Because the Company's reserve base is approximately 66% natural gas on
an energy equivalent basis as of December 31, 1994, it is more sensitive to
fluctuations in the price of natural gas than to fluctuations in the price of
oil.
 
     The Company periodically reviews the carrying value of its oil and gas
properties under the full-cost accounting rules of the Commission. Under the
full-cost accounting rules, capitalized costs of oil and gas properties on a
country-by-country basis may not exceed the present value of estimated future
net revenues from proved reserves, discounted at 10%, plus the lower of cost or
fair market value of unproved properties as adjusted for related tax effects.
The test is applied at the unescalated prices in effect at the applicable time
and results in a write-down if the "ceiling" is exceeded, even if prices
declined for only a short period of time. Many full-cost companies, including
Apache, are concerned about the impact of prolonged unfavorable gas prices on
their ceiling test calculations. A further deterioration of oil or gas prices
from current levels could result in the Company recording a noncash charge to
earnings related to its oil and gas properties in 1995. The Commission's rules
permit the exclusion of capitalized costs and present value of recently acquired
properties in performing ceiling test calculations. Pursuant to these rules,
Apache has requested waivers and the Commission has granted one-year waivers
with respect to the properties acquired from Texaco and certain properties
acquired from Crystal Oil Company ("Crystal"). If the ceiling is exceeded on all
U.S. properties, Apache is permitted to perform an additional ceiling test
excluding the capitalized costs and present value of the properties acquired
from Texaco and Crystal and required to record a write-down of carrying value if
the ceiling is still exceeded. If a write-down is required, it would result in a
one-time charge to earnings and would not impact net cash flow from operating
activities.
 
RELIANCE ON ESTIMATES OF PROVED RESERVES AND FUTURE NET REVENUES; DEPLETION OF
RESERVES
 
     There are numerous uncertainties inherent in estimating quantities of
proved reserves and in projecting future rates of production and timing of
development expenditures, including many factors beyond the control of the
producer. The reserve data set forth in this Prospectus or incorporated by
reference herein represent
 
                                        9
<PAGE>   11
 
only estimates. In addition, the estimates of future net cash flow from proved
reserves of the Company and the present value thereof are based upon various
assumptions about future production levels, prices and costs that may prove to
be incorrect over time. Any significant variance from the assumptions could
result in the actual quantity of the Company's reserves and future net cash flow
therefrom being materially different from the estimates set forth in this
Prospectus or incorporated by reference herein. In addition, the Company's
estimated reserves may be subject to downward or upward revision based upon
production history, results of future exploration and development, prevailing
oil and gas prices, operating and development costs and other factors.
 
     The rate of production from oil and gas properties declines as reserves are
depleted. Except to the extent that the Company acquires additional properties
containing proved reserves, conducts successful exploration and development
activities or, through engineering studies, identifies additional behind-pipe
zones or secondary recovery reserves, the proved reserves of the Company will
decline as reserves are produced. Future oil and gas production is, therefore,
highly dependent upon the Company's level of success in acquiring or finding
additional reserves.
 
ACQUISITION RISKS
 
     The Company intends to continue acquiring oil and gas properties. Although
the Company performs a review of the acquired properties that it believes is
consistent with industry practices, such reviews are inherently incomplete. It
generally is not feasible to review in depth every individual property involved
in each acquisition. Ordinarily, the Company will focus its review efforts on
the higher-value properties and will sample the remainder. However, even a
detailed review of records and properties may not necessarily reveal existing or
potential problems, nor will it permit a buyer to become sufficiently familiar
with the properties to assess fully their deficiencies and potential.
Inspections may not always be performed on every well, and environmental
problems, such as ground water contamination, are not necessarily observable
even when an inspection is undertaken. Even when problems are identified, the
Company often assumes certain environmental and other risks and liabilities in
connection with acquired properties. There are numerous uncertainties inherent
in estimating quantities of proved oil and gas reserves and actual future
production rates and associated costs with respect to acquired properties, and
actual results may vary substantially from those assumed in the estimates. In
addition, there can be no assurance that acquisitions will not have an adverse
effect upon the Company's operating results, particularly during the periods in
which the operations of acquired businesses are being integrated into the
Company's ongoing operations.
 
OPERATING RISKS; AVAILABILITY OF INSURANCE
 
     Exploration for and production of oil and natural gas can be hazardous,
involving unforeseen occurrences such as blowouts, cratering, fires and loss of
well control, which can result in damage to or destruction of wells or
production facilities, injury to persons, loss of life or damage to property or
the environment. The Company maintains insurance against certain losses or
liabilities arising from its operations in accordance with customary industry
practices and in amounts that management believes to be prudent. However,
insurance is not available to the Company against all operational risks, and the
occurrence of a significant event that is not fully insured could have a
material adverse effect on the Company's financial position.
 
COMPETITION
 
     The oil and gas industry is highly competitive. As an independent oil and
gas company, the Company frequently competes for reserve acquisitions,
exploration leases, licenses, concessions and marketing agreements against
companies having substantially larger financial and other resources than the
Company possesses.
 
GOVERNMENT REGULATIONS
 
     The Company's exploration, production and marketing operations are
regulated extensively at the federal, state and local levels, as well as by
other countries in which the Company does business. Oil and gas
 
                                       10
<PAGE>   12
 
exploration, development and production activities are subject to various laws
and regulations governing a wide variety of matters. For example, most states in
which Apache operates regulate the quantities of natural gas that may be
produced from wells within their borders to prevent waste in the production of
natural gas and to protect the correlative rights of competing interest owners.
It is impossible at this time to determine what changes may occur with respect
to such regulations and what effect, if any, such changes may have on the
Company and the natural gas industry as a whole.
 
     As an owner and operator of oil and gas properties, the Company is also
subject to various federal, state, local and foreign country environmental
regulations, including air and water quality control laws. These laws and
regulations may, among other things, impose liability on the lessee under an oil
and gas lease for the cost of pollution cleanup resulting from operations,
subject the lessee to liability for pollution damages, require suspension or
cessation of operations in affected areas and impose restrictions on the
injection of liquids into subsurface aquifers that may contaminate groundwater.
Although the Company believes that it is in substantial compliance with existing
applicable environmental laws and regulations, there can be no assurance that
substantial costs for compliance will not be incurred in the future. Moreover,
it is possible that other developments, such as stricter environmental laws,
regulations and enforcement policies thereunder, could result in additional,
presently unquantifiable, costs or liabilities to the Company.
 
                                       11
<PAGE>   13
 
                                USE OF PROCEEDS
 
     The net proceeds to be received by the Company from the sale of the
6,800,000 shares of Common Stock offered hereby are estimated to be $174 million
($200 million if the over-allotment option is exercised in full), assuming a
price to public of $26 5/8 per share. The Company intends to use approximately
$50 million of the net proceeds of the Offering to finance the pending
acquisition of the Aquila Assets, which are to be acquired for an aggregate
consideration of approximately $198 million in cash and certain other
considerations, subject to adjustment. Approximately $148 million of the
purchase price for certain Aquila Assets will be structured as a deferred
tax-free, like-kind exchange of properties with Citation. See "Recent
Developments." As a result, the remainder of the net proceeds of the Offering
will be applied to reduce indebtedness under the Company's principal revolving
credit facility.
 
     On August 25, 1995, the amount outstanding under the revolving credit
facility was $754 million. Based upon the Company's public senior debt rating
and its ratio of debt to total capital on such date, the facility bears interest
at the First National Bank of Chicago's prime rate of interest plus .125%, or at
London Interbank Offered Rates ("LIBOR") plus 1.125%, at the Company's option,
and has a final maturity date of March 1, 2000. Amounts paid under the facility
may subsequently be reborrowed to finance future acquisitions of oil and gas
properties or for other corporate purposes. Advances under the revolving credit
facility during the past year were used primarily for property acquisitions and
working capital. As of August 25, 1995, the Company has $75 million available
for borrowing under the credit facility. See "Management's Discussion and
Analysis of Financial Condition and Results of Operations -- Subsequent Events."
 
                   PRICE RANGE OF COMMON STOCK AND DIVIDENDS
 
     The Common Stock is listed on the NYSE and the CSE and traded under the
symbol "APA." The following table sets forth, for the periods indicated, (i) the
high and low sale prices of the Common Stock as reported on the NYSE Composite
Transactions Reporting System, and (ii) the dividends paid on the Common Stock.
 
<TABLE>
<CAPTION>
                                                             PRICE RANGE
                                                            -------------          CASH
                                                            HIGH     LOW      DIVIDENDS PAID
                                                            ----     ----     --------------
    <S>                                                     <C>      <C>      <C>
    1993:
      First Quarter.......................................  $26 1/4  $17 5/8       $.07
      Second Quarter......................................   30 1/4   24 3/8        .07
      Third Quarter.......................................   33 1/2   26 3/8        .07
      Fourth Quarter......................................   31 1/4   20 3/8        .07
    1994:
      First Quarter.......................................  $26 7/8  $22 1/2       $.07
      Second Quarter......................................   29       22 1/4        .07
      Third Quarter.......................................   29 1/4   23            .07
      Fourth Quarter......................................   28 7/8   23 5/8        .07
    1995:
      First Quarter.......................................  $27 1/4  $22 3/8       $.07
      Second Quarter......................................   30 7/8   25 3/4        .07
      Third Quarter (through August 24)...................   27 7/8   26            .07
</TABLE>
 
     For a recent closing sale price for the Common Stock, as reported on the
NYSE Composite Transactions Reporting System, see the cover page of this
Prospectus. As of August 24, 1995, there were approximately 13,400 holders of
record of Common Stock. Each share of Common Stock also represents one Common
Stock purchase right that, under certain circumstances, would entitle the holder
to acquire additional shares of Common Stock. See "Description of Capital
Stock." The Company has paid cash dividends on its Common Stock for 114
consecutive quarters through July 31, 1995, and intends to continue the payment
of dividends, although future dividend payments will depend upon the Company's
level of earnings, financial requirements and other relevant factors.
 
                                       12
<PAGE>   14
 
                                 CAPITALIZATION
 
     The following table sets forth the capitalization of the Company and its
consolidated subsidiaries as of June 30, 1995, and as adjusted to give effect to
the sale of the Common Stock offered hereby and the application of the estimated
net proceeds thereof as described in "Use of Proceeds."
 
<TABLE>
<CAPTION>
                                                                      ACTUAL       AS ADJUSTED(1)
                                                                    ----------     --------------
                                                                           (IN THOUSANDS)
<S>                                                                 <C>            <C>
Current maturities of long-term debt..............................  $    7,000       $    7,000
                                                                     =========      ===========
Long-term debt:
  Credit facility(2)..............................................  $  764,000       $  640,189
  9.25% notes, net of discount....................................      99,727           99,727
  3.93% convertible notes.........................................      75,000           75,000
  6% convertible subordinated debentures..........................     172,500          172,500
  Other (including subsidiary debt)...............................      96,686           96,686
                                                                    ----------     --------------
       Total long-term debt(3)....................................   1,207,913        1,084,102
                                                                    ----------     --------------
Shareholders' equity:
  Preferred stock, without par value, 5,000,000 shares authorized,
     none outstanding.............................................          --               --
  Common stock, $1.25 par value per share, 215,000,000 shares
     authorized, 71,033,559 and 77,833,559 shares issued,
     respectively(4)..............................................      88,792           97,292
  Paid-in capital.................................................     501,033          666,344
  Retained earnings...............................................     330,715          330,715
  Currency translation adjustment.................................     (16,544)         (16,544)
  Treasury stock, at cost, 1,119,040 shares.......................     (13,454)         (13,454)
                                                                    ----------     --------------
       Total shareholders' equity.................................     890,542        1,064,353
                                                                    ----------     --------------
  Total capitalization............................................  $2,098,455       $2,148,455
                                                                     =========      ===========
</TABLE>
 
---------------
 
(1) As adjusted to give effect to the sale of the 6,800,000 shares of Common
     Stock offered hereby, at an assumed price to public of $26 5/8 per share
     and the application of approximately $50 million of the net proceeds
     thereof to finance the pending Aquila acquisition and the application of
     the remaining $124 million of the net proceeds thereof to reduce
     indebtedness under the Company's principal revolving credit facility.
 
(2) Certain information concerning the Company's revolving credit facility is
     set forth in Note 3 to the audited consolidated financial statements
     incorporated by reference in this Prospectus. As of August 25, 1995, the
     outstanding balance under the credit facility was $754 million.
 
(3) Does not include certain contingent liabilities of the Company. See Note 9
     to the audited consolidated financial statements incorporated by reference
     in this Prospectus.
 
(4) Does not include the following shares of Common Stock reserved for issuance
     (subject to adjustment): 2,777,778 shares issuable on conversion of the
     3.93% convertible notes at $27.00 per share; 5,622,555 shares issuable on
     conversion of the 6% Convertible Subordinated Debentures due 2002 at $30.68
     per share; 122,606 shares reserved for the dividend reinvestment plan with
     respect to the Common Stock; 400,000 shares reserved for the
     retirement/401(k) savings plan; and 3,411,200 shares reserved under
     existing employee stock option plans, including 911,197 shares issuable on
     the exercise of employee stock options outstanding as of June 30, 1995 and
     362,400 shares issuable on the exercise of employee stock options granted
     August 23, 1995. Does not include 2,000,000 shares of Common Stock issuable
     from time to time in connection with the Company's private merger program.
     The Company currently has a policy of reserving one share of Common Stock
     for each share outstanding or otherwise reserved to provide for any
     issuances under the Company's Rights Agreement.
 
                                       13
<PAGE>   15
 
          SELECTED CONSOLIDATED FINANCIAL, OPERATING AND RESERVE DATA
 
     The following sets forth certain information regarding Apache's
consolidated results of operations, financial position and operating and reserve
data as of and for the periods indicated. On May 17, 1995, Apache acquired
DEKALB through a merger which was accounted for under the pooling of interests
method. As a result, the financial, operating and reserve data presented below
has been restated to present Apache and DEKALB on a combined basis, including
certain conforming adjustments to depreciation, depletion and amortization and
income taxes. The data presented below should be read in conjunction with the
Company's consolidated financial statements and the notes thereto incorporated
by reference in this Prospectus. The following financial information is not
necessarily indicative of future results of the Company.
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED DECEMBER 31,
                                              -------------------------------------------------------------------
                                                 1994          1993         1992(1)      1991(2)(3)       1990
                                              ----------    -----------    ----------    ----------    ----------
                                                       (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                           <C>           <C>            <C>           <C>           <C>
INCOME STATEMENT DATA:
  Oil and gas production revenues...........  $  538,389    $   481,848    $  453,835    $  409,011    $  335,450
  Consolidated revenues.....................     592,626        512,632       517,403       457,872       386,688
  Net income (loss)
    Continuing operations...................      45,583         41,421       (14,632)      (35,216)       53,114
    Discontinued operations.................          --             --        (1,050)           --        11,633
    Cumulative effect of change in
      accounting principle..................          --          5,334            --            --            --
                                              ----------    -----------    ----------    ----------    ----------
      Net income (loss).....................  $   45,583    $    46,755    $  (15,682)   $  (35,216)   $   64,747
                                              ==========    ===========    ==========    ==========    ==========
  Net income (loss) per common share
    Continuing operations...................  $      .65    $       .67    $     (.26)   $     (.65)   $       99
    Discontinued operations.................          --             --          (.02)           --           .21
    Cumulative effect of change in
      accounting principle..................          --            .08            --            --            --
                                              ----------    -----------    ----------    ----------    ----------
    Net income (loss) per common share......  $      .65    $       .75    $     (.28)   $     (.65)   $     1.20
                                              ==========    ===========    ==========    ==========    ==========
    Cash dividends per common share(4)......  $      .28    $       .28    $      .28    $      .28    $      .28
CASH FLOW DATA:
    Net income (loss) from continuing
      operations............................  $   45,583    $    41,421    $  (14,632)   $  (35,216)   $   53,114
    Depreciation, depletion and
      amortization..........................     257,821        198,320       179,876       188,410       160,693
    Impairments.............................       7,300         23,200        65,320        94,241            --
    Amortization of deferred loan costs.....       3,987          3,896         3,888         1,988           355
    Provision for deferred income taxes.....      24,385         20,539          (998)      (27,312)       17,773
    Gain on sale of investment in
      affiliate.............................          --             --       (30,259)           --            --
    Change in working capital and other.....      18,693        (31,385)       19,758       (21,122)       15,794
                                              ----------    -----------    ----------    ----------    ----------
      Net cash provided by operating
         activities.........................  $  357,769    $   255,991    $  222,953    $  200,989    $  247,729
                                              ==========    ===========    ==========    ==========    ==========
BALANCE SHEET DATA (period end):
    Working capital (deficit)...............  $   (3,203)   $   (55,538)   $  (32,755)   $  (57,593)   $   18,358
    Total assets............................   2,036,627      1,759,203     1,774,767     1,597,633     1,363,337
    Long-term debt..........................     719,033        504,334       524,098       658,395       386,580
    Shareholders' equity....................     891,087        868,596       554,524       601,181       622,489
    Common shares outstanding...............      69,666         69,504        55,361        55,305        53,296
PRODUCTION DATA:
    Oil (Mbbls).............................      13,815         13,036        13,465        10,063         5,988
    Natural gas (MMcf)......................     176,397        131,591       119,962       134,162       120,534
    Natural gas liquids (Mbbls).............         724            733           885         1,212           520
    Equivalent production (Mboe)............      43,939         35,701        34,344        33,635        26,597
AVERAGE SALES PRICE:
    Oil (per bbl)...........................  $    15.65    $     16.74    $    18.11    $    18.61    $    21.21
    Natural gas (per Mcf)...................        1.78           1.94          1.66          1.55          1.68
    Natural gas liquids (per bbl)...........       11.28          11.55         11.79         11.88         11.35
RESERVE DATA -- PROVED (period end):
    Oil and natural gas liquids (Mbbls).....     110,624        102,957        94,643       105,891        52,002
    Natural gas (MMcf)......................   1,316,155      1,125,630       919,642       963,242       889,178
    Equivalent reserves (Mboe)..............     329,983        290,562       247,917       266,431       200,198
    Present value of estimated future net
      cash flows, before income taxes,
      discounted at 10%.....................  $1,600,927    $ 1,626,096    $1,272,952    $1,334,532    $1,344,063
</TABLE>
 
---------------
(See notes on following page)
 
                                       14
<PAGE>   16
 
<TABLE>
<CAPTION>
                                                     THREE MONTHS                 SIX MONTHS
                                                    ENDED JUNE 30,              ENDED JUNE 30,
                                               ------------------------    ------------------------
                                               1995(5)(6)       1994       1995(5)(6)       1994
                                               ----------    ----------    ----------    ----------
                                                 (DOLLARS IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                                            <C>           <C>           <C>           <C>
INCOME STATEMENT DATA:
  Oil and gas production revenues............  $  174,519    $  134,440    $  317,708    $  259,418
  Consolidated revenues......................     206,052       147,054       373,770       279,775
  Net income.................................         537        12,907         4,620        21,132
  Net income per common share................         .01           .19           .07           .30
  Cash dividends per common share(4).........         .07           .07           .14           .14

CASH FLOW DATA:
  Net income from continuing operations......  $      537    $   12,907    $    4,620    $   21,132
  Depreciation, depletion and amortization...      78,830        61,969       148,625       122,226
  Impairments................................          --         2,800            --         6,300
  Amortization of deferred loan costs........       1,150           965         2,373         1,744
  Provision for deferred income taxes........      17,358         7,721        19,773        12,252
  Change in working capital and other........     (21,165)       (6,587)      (34,152)      (22,964)
                                               ----------    ----------    ----------    ----------
     Net cash provided by operating
       activities............................  $   76,710    $   79,775    $  141,239    $  140,690
                                                =========     =========     =========     =========
BALANCE SHEET DATA (period end):
  Working capital (deficit)..................  $   21,511    $  (19,685)   $   21,511    $  (19,685)
  Total assets...............................   2,554,557     1,823,797     2,554,557     1,823,797
  Long-term debt.............................   1,207,913       578,181     1,207,913       578,181
  Shareholders' equity.......................     890,542       876,978       890,542       876,978

PRODUCTION DATA:
  Oil (Mbbls)................................       5,122         3,381         9,152         6,690
  Natural gas (MMcf).........................      54,361        41,830       104,159        81,321
  Natural gas liquids (Mbbls)................         174           186           365           364
  Equivalent production (Mboe)...............      14,356        10,539        26,878        20,607

AVERAGE SALES PRICE:
  Oil (per bbl)..............................  $    17.48    $    15.98    $    17.20    $    14.42
  Natural gas (per Mcf)......................        1.52          1.87          1.50          1.96
  Natural gas liquids (per bbl)..............       12.19         11.09         12.14         10.61
</TABLE>
 
---------------
 
(1)  Includes $40.6 million after-tax writedown of DEKALB's oil and gas
     properties and $25.6 million after-tax loss from the sale of substantially
     all of DEKALB's U.S. assets. Also includes a $19.8 million after-tax gain
     resulting from the sale by the Company of its 36.67% interest in Natural
     Gas Clearinghouse.
 
(2)  Includes financial data for MW Petroleum Corporation after June 30, 1991.
 
(3)  Includes a $7.1 million after-tax charge resulting from the relocation of
     the Company's headquarters to Houston, Texas and a $66 million after-tax
     writedown of DEKALB's oil and gas properties.
 
(4)  No cash dividends were paid on outstanding DEKALB common stock in 1995,
     1994, 1993 and 1992. Cash dividends paid on DEKALB common stock totaled $.8
     million in 1991 and $2.9 million in 1990.
 
(5)  The three months and six months ended June 30, 1995 include the effect of
     the acquisition of properties from Texaco on March 1, 1995.
 
(6)  Includes nonrecurring transaction costs totaling $8.7 million after tax
     relating to the DEKALB merger.
 
                                       15
<PAGE>   17
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
     The Company has consummated two acquisitions in 1995. On March 1, 1995, the
Company purchased certain U.S. oil and gas properties from Texaco for an
adjusted purchase price of $564 million, effective January 1, 1995. On May 17,
1995, Apache acquired DEKALB, an oil and gas company engaged in the exploration
for, and the development of, crude oil and natural gas in Canada, pursuant to a
merger agreement under which Apache issued 8.4 million shares of Common Stock in
exchange for all outstanding DEKALB capital stock and DEKALB employee stock
options outstanding at the time of the merger and tendered to Apache. The merger
was accounted for as a pooling of interests for financial accounting purposes.
Accordingly, the following discussion and analysis has been prepared on a
combined basis using the pooling of interests method of accounting. As a result
of the Company's recent acquisitions, the Company's results of operations for
the first two quarters of 1995 are not comparable to its historical results and
are not necessarily indicative of results for the full year or future periods.
 
     Apache's financial performance during the first half of 1995 is best
understood in light of the following factors:
 
     Production Increases; Commodity Prices. The Company's performance during
the first two quarters of 1995 was affected by lower average natural gas prices,
substantially offset by increases in natural gas production. Apache's natural
gas production increased in the first half of 1995 by 28% over the prior year,
attributable principally to acquisitions and favorable drilling results. The
Company's average realized gas price of $1.50 per Mcf during the first half of
1995 was $.46 per Mcf below the price during the same period in the previous
year, negatively impacting sales by $48 million.
 
     In the first half of 1995, Apache's oil production increased by 37% over
the same period in 1994. Oil prices continued to improve from the five-year low
experienced in the fourth quarter of 1993. Oil revenues were positively impacted
by $25.5 million as a result of a $2.78 per barrel increase in average realized
oil prices in the first half of 1995 as compared with the same period in 1994.
 
     Acquisitions. The Company consummated the DEKALB and Texaco acquisitions
during the first half of 1995. The second quarter of 1995 reflects the ownership
of the properties acquired from Texaco. All of the Company's financial
statements have been restated as a result of the DEKALB merger, which was
accounted for as a pooling of interests.
 
     Since the Aquila transaction has not been consummated, the discussion
immediately following does not contemplate the effects of such transaction on
the Company's operations or liquidity. For a discussion of the effects of the
Aquila transaction, see "-- Subsequent Events" and "Recent Developments."
 
FINANCIAL RESULTS
 
     Apache reported net income of $.5 million, or $.01 per share, for the
second quarter of 1995 compared to $12.9 million, or $.19 per share, for the
same period last year. Current quarter earnings were reduced by a nonrecurring
pre-tax charge of approximately $10 million associated with Apache's acquisition
of DEKALB (now known as DEK Energy Company). The merger costs reduced 1995 net
income by $8.7 million, or $.12 per share. Apache's results of operations for
the quarter were also negatively impacted by a 19% decline in gas prices which
reduced revenues by $19 million and net income by $.16 per share.
 
     Earnings for the first six months of 1995 totaled $4.6 million, or $.07 per
share, compared to $21.1 million, or $.30 per share, during the first half of
1994. Lower gas prices compared to a year ago negatively impacted revenues by
$48 million and partially offset the impact of increased oil and gas production
from acquisitions and drilling.
 
                                       16
<PAGE>   18
 
RESULTS OF OPERATIONS
 
     Volume and price information for the Company's 1995 and 1994 second quarter
and first six months oil and gas production is summarized in the following
tables:
 
<TABLE>
<CAPTION>
                                      FOR THE QUARTER                  FOR THE SIX MONTHS
                                      ENDED JUNE 30,                     ENDED JUNE 30,
                                    -------------------    INCREASE    -------------------    INCREASE
                                      1995       1994     (DECREASE)     1995       1994     (DECREASE)
                                    --------   --------   ----------   --------   --------   ----------
<S>                                 <C>        <C>        <C>          <C>        <C>        <C>
Gas Volume -- Mcf per day:
  U.S..............................  519,147    402,765       29%       502,679    392,820       28%
  Canada...........................   73,683     53,057       39%        67,458     52,472       29%
  Australia........................    4,542      3,850       18%         5,329      3,994       33%
                                    --------   --------                --------   --------
  Total............................  597,372    459,672       30%       575,466    449,286       28%
                                    ========   ========                ========   ========
Average Gas Price -- Per Mcf:
  U.S.............................. $   1.59   $   1.89      (16%)     $   1.56   $   1.99      (22%)
  Canada...........................     1.02       1.71      (40%)         1.00       1.70      (41%)
  Australia........................     1.87       1.96       (5%)         1.94       1.93        1%
  Total............................     1.52       1.87      (19%)         1.50       1.96      (23%)
Oil Volume -- Barrels per day:
  U.S..............................   50,869     32,461       57%        45,334     32,233       41%
  Canada...........................    2,061      1,952        6%         2,014      2,035       (1%)
  Australia........................    3,360      2,741       23%         3,217      2,693       19%
                                    --------   --------                --------   --------
  Total............................   56,290     37,154       52%        50,565     36,961       37%
                                    ========   ========                ========   ========
Average Oil Price -- Per barrel:
  U.S.............................. $  17.36   $  15.82       10%      $  17.07   $  14.21       20%
  Canada...........................    17.81      16.63        7%         17.26      14.36       20%
  Australia........................    19.16      17.42       10%         19.05      16.91       13%
  Total............................    17.48      15.98        9%         17.20      14.42       19%
NGL Volume -- Barrels per day:
  U.S..............................    1,378      1,356        2%         1,470      1,340       10%
  Canada...........................      539        687      (22%)          549        669      (18%)
                                    --------   --------                --------   --------
  Total............................    1,917      2,043       (6%)        2,019      2,009        0%
                                    ========   ========                ========   ========
Average NGL Price -- Per barrel:
  U.S.............................. $  13.29   $  12.60        5%      $  13.01   $  11.83       10%
  Canada...........................     9.39       8.10       16%          9.80       8.16       20%
  Total............................    12.19      11.09       10%         12.14      10.61       14%
</TABLE>
 
     Oil and gas production revenues for the second quarter and first half of
1995 increased over the prior year by 30% and 22%, respectively, due to the
March 1, 1995 acquisition of properties from Texaco, acquisitions completed by
Apache during the fourth quarter of 1994 and favorable drilling results. The
declines in Apache's second quarter and first half average realized gas price,
reflecting significantly lower spot prices from a year ago, offset further
increases in revenue.
 
     Second quarter gas sales increased to $82.8 million, up six percent from
the same period last year. Apache's second quarter gas production was a record
597.4 MMcfd, an increase of 30% from last year. Of the 137.7 MMcfd increase in
gas production in the second quarter of 1995, 68 MMcfd was a result of the
acquisition of properties from Texaco and 22 MMcfd resulted from the acquisition
of properties from Crystal in December 1994. Apache's average natural gas price
declined 19% from second quarter 1994 to $1.52 per Mcf, negatively impacting
revenues by $19 million.
 
     Gas sales for the first six months of 1995 of $155.8 million declined two
percent compared to the six-month period in 1994 as the impact of lower gas
prices more than offset production gains. Apache's production increased 126.2
MMcfd during the first half of 1995 as compared to the same period in 1994. The
28%
 
                                       17
<PAGE>   19
 
increase in gas production in the first six months of 1995 resulted largely from
the acquisition of properties from Texaco and Crystal. The volume increase
resulted in additional sales of $44.7 million. The Company's realized gas price
of $1.50 per Mcf during the first half of 1995 was $.46 per Mcf lower than last
year's price of $1.96 per Mcf during the same period. The 23% drop in the
average realized price of gas negatively impacted sales by $48 million.
 
     Oil sales of $89.6 million for the 1995 second quarter were $35.5 million,
or 66%, above the previous year as a result of higher production volumes. The
52% increase in oil production was primarily due to the acquisition of Texaco
properties, which added 17.7 Mbopd to Apache's second quarter sales. The total
increase in production favorably impacted sales by $27.8 million, while a $1.50
per barrel increase in realized oil prices compared to 1994 positively impacted
1995 sales by $7.7 million.
 
     For the first six months of 1995, oil sales increased 63% to $157.4
million, compared to $96.4 million for the same period a year ago. In the first
half of 1995, oil production rose 13.6 Mbopd, or 37%. Oil revenues were
positively impacted by $25.5 million as a result of a $2.78 per barrel increase
in realized oil prices.
 
     Revenues from the sale of natural gas liquids totaled $2.1 million for the
second quarter and $4.4 million for first half of 1995. Higher natural gas
liquids prices contributed to the $.1 million quarter-to-quarter and $.6 million
year-to-year increases in sales as compared to a year ago.
 
     Gathering, processing and marketing revenues of $28.4 million for the
second quarter and $51.2 million for the first half of 1995 were 169% and 196%,
respectively, higher than last year's revenues. Operating margins increased $.3
million from the second quarter of 1994 and $.6 million from the first six
months of 1994, respectively. The activity reflects increased volumes of
purchase and resale transactions by Apache's oil and gas marketing subsidiaries.
These transactions generally carry a low margin.
 
     Depreciation, depletion and amortization expense of $78.8 million for the
second quarter of 1995 and $148.6 million for the first half of the year
increased 27% and 22%, respectively, over the comparable 1994 periods due to
increased oil and gas production. Apache's domestic depreciation, depletion and
amortization rate for the second quarter declined from $5.60 per boe in 1994 to
$5.32 per boe in 1995 due to the impact of the Texaco acquisition.
 
     Operating costs rose $20 million, or 56%, to $55.5 million for the quarter
and $29.3 million, or 41%, to $100.5 million year-to-date from the comparable
periods last year due primarily to the impact of Apache's acquisitions.
Operating costs include lifting costs, workover expense, production taxes and
severance taxes. Based on an equivalent unit of production, operating costs
increased 15% in the second quarter of 1995 to $3.87 per boe and eight percent
in the first half period to $3.74 per boe, respectively. The increase in unit
cost reflects the high percentage of oil properties included in the Texaco
transaction, as oil properties typically have a higher per unit expense than gas
properties.
 
     Administrative, selling and other costs in the second quarter of 1995 rose
$.2 million, or two percent, from a year ago, while costs for the first half
increased $.6 million, or three percent, due to costs of integrating the Texaco
properties. On a boe basis, costs for the quarter and first six months dropped
25% and 21%, respectively, due to increased production from acquisitions and
drilling. In connection with the DEKALB merger, nonrecurring transaction costs
totaling approximately $10 million were charged to expense in the second quarter
of 1995.
 
     Net financing costs increased 149% for the second quarter of 1995 to $20.3
million, and 132% for the first half of the year to $35.6 million. The increase
in financing costs reflects an increase in debt outstanding and higher interest
rates as compared to last year. Debt increased $496 million since December 31,
1994 and $696 million since December 31, 1993, as a result of increased
borrowings to fund acquisitions. The increase in interest rates primarily
reflects higher market rates.
 
                                       18
<PAGE>   20
 
CASH FLOW, LIQUIDITY AND CAPITAL RESOURCES
 
  Capital Commitments.
 
     Apache's primary needs for cash are for exploration, development and
acquisition of oil and gas properties, repayment of principal and interest on
outstanding debt and payment of dividends. The Company generally funds its
exploration and development activities through internally generated cash flows.
Apache budgets its capital expenditures based upon projected cash flows and
routinely adjusts its capital expenditures in response to changes in oil and gas
prices and corresponding changes in cash flow.
 
     Expenditures for exploration and development totaled $142.1 million during
the first half of 1995 compared to $162.8 million during the same period last
year. In the first six months of 1995, Apache completed 68 of 102 gross wells as
producers, while the Company completed 149 of 183 gross wells as producers in
the first half of 1994. While the Company reduced its exploration and
development expenditures from a year ago so that additional cash from operating
activities could be applied to reduce debt, Apache continued to drill in the
Mid-Continent, Permian Basin and Gulf of Mexico regions of the United States.
Internationally, the Company continued developmental drilling on the Harriet
prospect in Australia and appraisal drilling on the Zhao Dong prospect in the
Bohai Bay, People's Republic of China. Further evaluation is necessary to
determine the commercial potential of the discovery offshore China. In Egypt, an
appraisal well further delineated a discovery made on the Qarun prospect. This
well confirmed the results of one of two earlier discoveries, which established
the development potential of this area of the Qarun Concession. International
exploration and development expenditures totaled $36.3 million in the first half
of 1995 compared to $36.7 million in 1994. Apache's annual expenditures for
exploration and development are expected to total approximately $275 million for
1995, not taking into account any capital expenditures associated with the
properties to be acquired in the Aquila transaction.
 
     Acquisitions for cash during the first half of 1995 totaled $573.9 million
as compared to $27 million for the same period of 1994. On March 1, 1995, Apache
purchased certain oil and gas assets from Texaco for an adjusted purchase price
of $564 million. In addition to the properties acquired for cash during the
first six months of 1995, Apache issued 8.4 million shares of Common Stock to
acquire DEKALB in a transaction accounted for as a pooling of interests. See
"Acquisitions" in the Notes to the audited Consolidated Financial Statements
incorporated herein by reference.
 
  Capital Resources and Liquidity.
 
     Apache's primary capital resources are net cash provided by operating
activities, unused borrowing capacity under the Company's revolving bank credit
facility and proceeds from the sale of non-strategic assets. Net cash provided
by operating activities totaled $141 million for the first half of 1995 and
1994.
 
     On January 4, 1995, Apache completed the issuance of $172.5 million
principal amount of its 6% Convertible Subordinated Debentures due 2002, which
are convertible into Common Stock at a conversion price of $30.68 per share. The
Company anticipates filing a registration statement on Form S-3 in September
1995 with respect to resales of underlying shares of Common Stock. Net proceeds
were used to reduce bank debt, to provide funds for acquisitions and for general
corporate purposes. The 6% debentures have not been registered under the
Securities Act of 1933, as amended ("Securities Act"), and may not be offered or
sold in the United States absent registration or an applicable exemption from
such registration requirements. Costs associated with the issue of the 6%
debentures totaled $4.1 million.
 
     On March 1, 1995, the Company's revolving bank credit facility was amended
and restated, increasing it from $700 million to $1 billion. The facility
matures on March 1, 2000, and may be extended in one-year increments with the
lenders' consent. Based on the Company's ratio of debt to total capital, the
interest rate margin over LIBOR at June 30, 1995 was 1.125%. The Company also
pays a facility fee based on its ratio of debt to total capital. The facility
fee at June 30, 1995 was .375% of the available portion of the commitment and
 .1875% of the unavailable portion of the commitment. As of June 30, 1995, the
available portion of the commitment was $831 million, of which $764 million was
outstanding. Costs associated with the amendment
 
                                       19
<PAGE>   21
 
of the credit facility totaled $7.2 million. At June 30, 1995, Apache had a
total of $1.2 billion in long-term debt outstanding, up $496 million from the
end of 1994.
 
     During the first half of 1995, Apache received $73.2 million from the
disposition of oil and gas properties as part of its previously announced plans
to sell lower-margin and non-strategic properties. On July 18, 1995, Apache
entered into an agreement for the disposition of certain of its Rocky Mountain
properties to Citation for consideration of $155 million, subject to adjustment.
The assets subject to such agreement include Apache's interest in 138 fields
with approximately 1,600 active wells located in Colorado, Montana, North
Dakota, South Dakota, Utah and Wyoming.
 
     The Company had $17.3 million in cash equivalents on hand at June 30, 1995,
down from $30 million at the end of 1994. The Company's ratio of current assets
to current liabilities at quarter-end 1995 of 1.1:1 was improved from year-end
1994 when the ratio was 1.0:1.
 
     Management believes that cash on hand, net cash provided by operating
activities and unused available borrowing capacity under the revolving bank
credit facility will be adequate to meet future liquidity needs for the next two
fiscal years, including satisfaction of the Company's financial obligations and
funding of exploration and development operations and routine acquisitions.
 
  Future Trends.
 
     The Company plans to continue with implementation of several strategic
initiatives designed to accelerate the integration of acquired properties,
streamline operations and strengthen its balance sheet. As previously announced,
Apache plans to accelerate the disposition of non-strategic assets and to close
the Denver, Colorado office in 1995. In general, the proceeds from property
dispositions will be used for debt reductions.
 
     Apache has continually followed a practice of expanding and upgrading its
reserves through a combination of exploratory and development drilling,
workovers and recompletions and upgrading its production base by disposing of
lower-margin and non-strategic properties. Apache will continue to review
acquisition opportunities which are additive to earnings and cash flow, and to
review its capital structure to maximize shareholders' return and maintain
financial flexibility.
 
SUBSEQUENT EVENTS
 
     The Aquila Assets are concentrated, with the largest seven fields
representing approximately three quarters of proved reserves, and many of the
Aquila properties are located in close proximity to existing Apache properties.
Accordingly, the Company believes that economies of scale will result from
elimination of duplicative administrative and other expenses and the
consolidation of nearby operations following the closing of the Aquila
transaction. In the Gulf of Mexico, the Company expects to operate certain
currently manned Aquila platforms as unmanned platforms, using the facilities
and personnel located at nearby Apache platforms. In addition, the high
percentage of gas properties included in the Aquila Assets can be expected to
reduce operating costs on an equivalent unit of production basis, as gas
properties typically have a lower per unit expense than oil properties.
 
     A significant portion of the net proceeds of the Offering will be applied
to reduce indebtedness under the Company's principal revolving credit facility.
See "Use of Proceeds." After giving effect to such repayment of debt, as of June
30, 1995, the Company would have a ratio of debt to total capitalization of
approximately 51%. As of August 25, 1995, the Company has $75 million available
for borrowing under the credit facility. The credit facility provides for
periodic redeterminations of the borrowing base to reflect the Company's
estimated proved reserves. The Company is currently evaluating alternatives to
refinance a portion of its outstanding debt.
 
     In connection with its ongoing private merger program, the Company has
filed an acquisition shelf registration statement on Form S-4 with respect to
2,000,000 shares of Common Stock to be offered from time to time in connection
with the acquisition of privately held interests in oil and gas properties and
related assets or in entities that hold such interests or assets.
 
                                       20
<PAGE>   22
 
                                  THE COMPANY
OVERVIEW
 
     Apache Corporation, a Delaware corporation formed in 1954, is an
independent energy company that explores for, develops, produces, gathers,
processes and markets crude oil and natural gas. In North America, Apache's
exploration and production interests are spread over 15 states and two Canadian
provinces, focusing on the Gulf of Mexico, the Anadarko Basin, the Permian
Basin, the Gulf Coast, the Rocky Mountains and the Western Sedimentary Basin of
Canada. Outside of North America, Apache has exploration and production
interests offshore Western Australia and exploration interests in Egypt and
Indonesia and offshore China and the Ivory Coast. Apache's Common Stock has been
listed on the NYSE since 1969 and on the CSE since 1960.
 
     As of December 31, 1994, on a pro forma basis giving effect to the
completed Texaco and DEKALB transactions and the pending Aquila acquisition, and
net of completed and pending property dispositions in 1995, the Company's
estimated proved reserves were 420 MMboe, of which approximately 62% was natural
gas.
 
     As of December 31, 1994, Apache (including DEKALB) had approximately 4,085
net oil and gas wells and 1,032,982 net developed acres of oil and gas
properties. In addition, the Company had interests in 760,270 net undeveloped
acres under U.S. and Canadian leases and 4,239,290 net undeveloped acres under
international exploration and production rights. The Company completed 296 of
367 North American wells during 1994 as producers, and completed 415 workover
and recompletion projects. For the second quarter of 1995, which included
results from the Texaco and DEKALB transactions, the Company's daily average oil
and gas production was approximately 56 Mbbls and 597 MMcf, respectively.
 
     The Company holds interests in many of its U.S., Canadian and international
properties through operating subsidiaries, such as MW Petroleum Corporation
("MW"), DEK Energy Company (formerly known as DEKALB), Apache Energy Resources
Corporation ("AERC," formerly known as Hadson Energy Resources Corporation),
Apache Energy Limited ("AEL," formerly known as Hadson Energy Limited), Apache
International, Inc. and Apache Overseas, Inc. Properties referred to in this
Prospectus may be held by those subsidiaries. The Company treats all operations
as one segment of business.
 
     On May 17, 1995, Apache acquired DEKALB, an oil and gas company engaged in
the exploration for, and the development of, crude oil and natural gas in
Canada, through a merger which resulted in DEKALB's becoming a wholly owned
subsidiary of Apache. The merger was accounted for as a pooling of interests for
financial accounting purposes. As a result, Apache's financial information has
been restated to include DEKALB on a combined basis. On March 1, 1995, the
Company acquired certain oil and gas properties from Texaco for an adjusted
purchase price of $564 million. See "Recent Developments."
 
     The Company is a Delaware corporation with its principal executive offices
at One Post Oak Central, 2000 Post Oak Boulevard, Suite 100, Houston, Texas
77056-4400. The Company's telephone number is (713) 296-6000.
 
STRATEGY
 
     Apache's growth strategy is to increase oil and gas reserves, production
and cash flow through a combination of acquisitions, moderate-risk drilling and
development of its inventory of existing projects. Apache also emphasizes
reducing operating costs per unit produced and selling marginal and
non-strategic properties in order to increase its profit margins. An emerging
aspect of Apache's strategy is its exploration and development activity in the
international arena in pursuit of larger reserve targets than are generally
available domestically. Several recent discoveries abroad have created an
inventory of development projects to be drilled in the next several years.
 
     Because production of oil and gas results in depletion of reserves, future
oil and gas production is highly dependent upon Apache's level of success in
adding reserves. Apache adds reserves by acquisition, active exploration and
development, and identification, through engineering studies, of additional
behind-pipe zones or secondary recovery reserves.
 
                                       21
<PAGE>   23
 
     In conjunction with Apache's ongoing property acquisitions, the Company has
recently initiated the Apache private merger program to acquire privately held
interests in oil and gas properties. The primary focus of this program will be
to acquire interests in properties in areas where the Company operates. To
enable the Company to use Common Stock as well as cash in such acquisitions, the
Company has filed a Common Stock acquisition shelf registration statement on
Form S-4 with respect to 2,000,000 shares of Common Stock.
 
     Property acquisition is only one phase in a continuing cycle of Apache's
business growth. Apache's objective is to follow each material acquisition with
a cycle of reserve enhancement, property consolidation and cash flow
acceleration, facilitating asset growth and debt reduction. This approach
requires well-planned and carefully executed property development and a
commitment to a selective program of ongoing property dispositions. Apache
targets acquisitions that have ascertainable additional reserve potential to
which it applies an active drilling, workover and recompletion program to
realize the potential of undeveloped and partially developed properties. In
1994, the Company replaced over 114% of U.S. production through its drilling,
workover and recompletion program. Apache prefers to operate its properties so
that it can more efficiently influence their development and currently operates
properties accounting for over 75% of its production.
 
NORTH AMERICAN OPERATIONS
 
     The Company's North American exploration and production activities are
divided into four U.S. operating regions, the Gulf of Mexico, Mid-Continent,
Western and Gulf Coast regions, and a Canadian region. At December 31, 1994,
approximately 97% of the Company's total estimated proved reserves (prior to any
dispositions in 1995) was located in the four U.S. regions and Canada.
 
     Gulf of Mexico. As a result of Apache's acquisition of Matagorda Island
Blocks 681 and 682 in late 1992 and the Hall-Houston transactions in 1993, the
Gulf of Mexico became Apache's largest producing region. The Gulf of Mexico
region encompasses all of Apache's interests in properties offshore Texas,
Louisiana and Alabama. By year-end 1994, Apache increased its production in the
Gulf of Mexico to approximately 203 MMcf of gas per day. At December 31, 1994,
the Gulf of Mexico region encompassed 282,302 net acres, located in both state
and federal waters, and accounted for 48 MMboe, or 15%, of Apache's total
estimated proved reserves.
 
     Mid-Continent. Apache's Mid-Continent region is known for its sizable
position in the Anadarko Basin. Apache has drilled and operated in the Anadarko
Basin for over three decades, developing an extensive database of geologic
information and a substantial acreage position. In 1993, Apache enhanced its
position through the acquisition of AERC with its significant acreage and
producing interests in the Anadarko Basin. At December 31, 1994, Apache held an
interest in 271,770 net acres in the region, which accounted for approximately
76 MMboe, or 23%, of Apache's total estimated proved reserves.
 
     Western. In July 1995, Apache announced its intention to dispose of a
substantial portion of its Rocky Mountain properties in connection with its
property rationalization program. The Company has agreed to engage in a deferred
tax-free, like-kind exchange of such Rocky Mountain properties for certain
Aquila Assets located in the Mid-Continent, Gulf of Mexico and Gulf Coast areas.
See "Recent Developments." In connection with this disposition, the Company is
closing its Rocky Mountain regional office, located in Denver, Colorado, and
redeploying those employees to provide support for its Gulf Coast, Permian Basin
and Canadian operations. The Rocky Mountain properties to be exchanged by Apache
comprise interests in 138 fields and approximately 1,600 active wells in six
states with daily production of approximately 9 Mbbls of oil and 9 MMcf of
natural gas. At December 31, 1994, these properties accounted for estimated
proved reserves of 28 MMboe, which includes certain reserves acquired in the
Texaco transaction.
 
     Apache will retain its assets in the Green River Basin of Colorado and
Wyoming and in the San Juan Basin of New Mexico, and will operate those
properties through its former Permian Basin region, which has been renamed the
Western region to reflect the integration of the remaining Rocky Mountain
properties. The other properties comprising the Western region are located in
the Permian Basin of West Texas and New Mexico and have been important producers
for Apache, generating 16% of the Company's production revenues during 1994. As
of December 31, 1994, the properties that comprise the Western region, after
giving
 
                                       22
<PAGE>   24
 
effect to completed and pending dispositions in 1995, accounted for 70 MMboe, or
21%, of the Company's total estimated proved reserves.
 
     Gulf Coast. Apache's Gulf Coast region encompasses the Texas and Louisiana
coasts, central Texas, Mississippi and Alabama. At year-end 1994, the region
encompassed approximately 194,107 net acres, and accounted for 43 MMboe, or 13%,
of the Company's total estimated proved reserves.
 
     Canada. The Canadian region concentrates its exploration and development
activity in the Provinces of Alberta and British Columbia. The region generated
eight percent of the Company's revenues in 1994. At December 31, 1994, the
region encompassed approximately 408,114 net acres, and accounted for 61 MMboe,
or 18%, of the Company's total estimated proved reserves.
 
AUSTRALIAN AND INDONESIAN OPERATIONS
 
     Australia. The state of Western Australia has become an important region
for Apache following the completion of the AERC acquisition. In the fourth
quarter of 1993, Apache consolidated the operations of its Australian properties
with AERC's Australian subsidiary, AEL, headquartered in Perth, Western
Australia. Average production in the region was approximately 3,500 bopd during
June 1995.
 
     At December 31, 1994, Apache held 3,373,150 net developed and undeveloped
acres in Western Australia. Australian reserves accounted for 11 MMboe, or 3%,
of the Company's total proved reserves at year-end 1994. Apache also owns a
22.5% interest in and operates the Harriet Gas Gathering Project, a gas
processing and compression facility with a throughput capacity of 80 MMcfd, and
a 60-mile, 12-inch offshore pipeline with a throughput capacity of 175 MMcfd.
The facilities are located in close proximity to AEL's producing properties
offshore in the Carnarvon Basin. During 1994, AEL produced and sold 2.9 Bcf of
natural gas.
 
     Indonesia. In early 1993, Apache took over as operator and increased its
interest in the Java Sea IV Block, offshore Indonesia, and the Padang Panjang
Block on the island of Sumatra, Indonesia. In early 1994, operations for
Indonesia were consolidated under the direction of AEL out of its offices in
Perth, Western Australia. In 1994, two exploratory wells were drilled in
Indonesia, one of which was a discovery that is currently being appraised for
commerciality.
 
OTHER INTERNATIONAL OPERATIONS
 
     Egypt. Apache and its partners are developing two adjacent fields in the
Western Desert of Egypt. Apache holds a 25% interest in the two-million acre
Qarun Concession in the Western Desert of Egypt which is operated by Phoenix
Resource Companies of Qarun. In February 1995, Apache and its partners announced
a discovery in the Qarun Concession that tested at rates up to 1,370 bopd. In
May 1995, Apache and its partners announced a second discovery in the Qarun
Concession in which the discovery well tested at cumulative rates of up to
11,957 bopd. Development of the Qarun Concession is currently underway, and oil
sales are expected to commence as early as the fourth quarter of 1995.
 
     China. Apache and its partner are evaluating a discovery in the Bohai Bay,
offshore the People's Republic of China. Apache has a 50% interest in, and acts
as operator of, a concession containing approximately 48,677 undeveloped acres
(24,339 acres net to Apache) in the Zhao Dong Block of the Bohai Bay, offshore
the People's Republic of China. In 1994, the initial discovery well tested at a
rate of over 2,000 bopd and was confirmed by an appraisal well which tested at
over 3,500 bopd. An appraisal drilling program is currently being conducted to
evaluate field development of the block.
 
     Other. The Company has an interest in the Foxtrot Concession offshore the
Ivory Coast and is currently seeking a market for any gas that may be produced
from such concession.
 
                                       23
<PAGE>   25
 
                              RECENT DEVELOPMENTS
 
ACQUISITION OF AQUILA PROPERTIES
 
     On August 28, 1995, the Company entered into an agreement with Aquila, a
wholly owned, indirect subsidiary of UtiliCorp, to acquire substantially all the
assets of Aquila for approximately $198 million, subject to certain post-closing
adjustments. The Aquila Assets include estimated proved reserves of 26 MMboe at
year-end 1994 and a favorable long-term gas sales contract at escalating prices,
with an allocated value under the purchase agreement of $28.7 million. Aquila
will receive a 7.5% net profits interest in the Aquila Assets, effective after
Apache has recovered an amount equivalent to the purchase price, costs incurred
in connection with the Aquila Assets and fees and other transaction costs not to
exceed $7 million in connection with the Offering and the Aquila transaction.
The closing of the Offering is conditioned upon and is expected to occur
concurrently with the closing of the Aquila transaction.
 
     The Aquila Assets are concentrated, with the largest seven fields
representing approximately three quarters of proved reserves and the largest 15
fields representing more than 90% of proved reserves. Five of the largest seven
fields are operated by Aquila. Based on information provided to the Company by
Aquila, the Aquila Assets represented estimated proved reserves of approximately
26 MMboe at December 31, 1994, of which approximately 77% was gas.
 
     The Aquila Assets consist of interests in 63 fields (including 45 producing
areas and fields) located on 250,000 gross acres in the Anadarko Basin, the Gulf
of Mexico and the Permian Basin. In addition, the Aquila Assets include
nonoperated minority interests in four gas plants in Oklahoma. The Aquila
properties are in many cases located in close proximity to existing Apache
properties. Accordingly, the Company believes that the acquisition of the Aquila
properties will result in certain economies of scale for Apache. See
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Subsequent Events."
 
     The long-term gas sales contract included in the Aquila Assets provides
that Aquila's affiliate will agree to purchase approximately 43 Bcf of gas to be
delivered by the Company over a period of five years and four months at a
specified price commencing at $2.00 per MMBtu in 1995 and increasing to $2.70 in
1996, $2.80 in 1997, $2.90 in 1998, $3.10 in 1999 and $3.20 in 2000.
 
     The agreement provides that the Company and its wholly owned subsidiaries,
MW and AERC, may effect a deferred tax-free exchange of like-kind properties of
qualifying use for certain of the Aquila Assets. The like-kind properties to be
exchanged by the Company primarily include lower margin and non-strategic
properties located in the Rocky Mountains which were previously selected for
sale by the Company in connection with its ongoing program of selective property
dispositions.
 
OTHER RECENT ACQUISITIONS
 
     On March 1, 1995, Apache purchased certain U.S. oil and gas properties from
Texaco for an adjusted purchase price of $564 million, effective January 1,
1995. The Texaco properties comprised estimated proved reserves at the effective
date of approximately 105 MMboe (after adjustment for the exercise of
preferential rights and properties excluded following due diligence and using
unescalated prices), of which approximately 70% was oil. At the time of
purchase, the daily production of the acquired properties was approximately 20
Mbbls of oil and 85 MMcf of natural gas.
 
     The Texaco properties are concentrated, with approximately two-thirds of
the reserves located in 54 fields, and are in producing regions where Apache has
existing operations -- the Permian Basin, the Gulf Coast of Texas and Louisiana,
western Oklahoma, eastern Texas and the Gulf of Mexico. Apache operates
approximately two-thirds of the production and holds an average working interest
of 70% in the operated properties. The Texaco transaction included approximately
500,000 net mineral acres, as well as a substantial quantity of seismic data.
 
     On May 17, 1995, Apache acquired DEKALB, an oil and gas company engaged in
the exploration for, and the development of, crude oil and natural gas in
Canada, through a merger which resulted in DEKALB's becoming a wholly owned
subsidiary of Apache. Pursuant to the merger agreement, Apache issued 8.4
million
 
                                       24
<PAGE>   26
 
shares of its common stock in exchange for all outstanding DEKALB capital stock
and DEKALB employee stock options outstanding at the time of the merger and
tendered to Apache. The merger was accounted for as a pooling of interests for
financial accounting purposes.
 
     At year-end 1994, DEKALB's estimated proved reserves, located almost
entirely in Canada, were estimated to be approximately 300 Bcf of natural gas
and 11 MMbbls of hydrocarbon liquids, or a total of 61 MMboe. The DEKALB
acquisition provides Apache with a substantial presence in North America's
largest natural gas basin and the infrastructure, including skilled
professionals, to conduct Canadian operations. Apache believes that the DEKALB
properties have significant potential for both exploration and further
development.
 
DISPOSITIONS
 
     In early 1995, Apache announced plans to accelerate the disposition of
certain properties, including the sale of a substantial portion of its Rocky
Mountain properties and lower margin and non-strategic properties. During the
first half of 1995, Apache received approximately $73 million from completed
sales of such properties. In July 1995, the Company signed an agreement to
dispose of certain Rocky Mountain properties for approximately $155 million,
subject to adjustment. The properties covered by this agreement had 28 MMboe of
estimated proved reserves at December 31, 1994. The Rocky Mountain properties
disposition, which is anticipated to close August 31, 1995, and the acquisition
of the Aquila Assets have been structured in part as a deferred tax-free,
like-kind exchange of properties.
 
SUMMARY PRO FORMA OIL AND GAS RESERVE INFORMATION
 
     The following table sets forth summary pro forma information with respect
to the Company's estimated proved oil and gas reserves as of December 31, 1994,
giving effect to the completed DEKALB and Texaco transactions, the pending
Aquila acquisition and certain completed and pending dispositions of
non-strategic properties in 1995. The reserve information below is based on
estimates calculated as of December 31, 1994 and does not reflect production and
revisions since December 31, 1994 or changes in oil and gas prices, changes in
expectations of developing and producing proved undeveloped reserves (including
offshore), changes in marketing expectations and access to markets or changes in
estimates of recoverable reserves resulting from price changes. The reserves
attributable to the completed DEKALB and Texaco acquisitions and the pending
Aquila acquisition were not owned by the Company on such date. The Company has
made other acquisitions and dispositions of property interests during 1995 which
in the aggregate are not material. All estimates of oil and gas reserves are
subject to significant uncertainty. See "Risk Factors."
 
<TABLE>
<CAPTION>
                                        APACHE AND                                1995           TOTAL
                                        DEKALB(1)    TEXACO(2)   AQUILA(3)   DISPOSITIONS(4)     PROVED
                                        ----------   ---------   ---------   ---------------   ----------
<S>                                     <C>          <C>         <C>         <C>               <C>
Oil and natural gas liquids (Mbbls)....    110,624      73,597       6,035         29,166         161,090
Natural gas (MMcf).....................  1,316,155     186,495     120,857         68,351       1,555,156
Equivalent reserves (Mboe).............    329,983     104,680      26,178         40,558         420,283
Present value of estimated future net
  cash flows, before income taxes,
  discounted at 10% (in thousands)..... $1,600,927   $ 368,518   $ 110,120      $ 149,650      $1,929,915
</TABLE>
 
---------------
 
(1) The Company acquired DEKALB by merger effective May 17, 1995.
 
(2) On March 1, 1995, the Company acquired certain properties from Texaco,
    effective January 1, 1995.
 
(3) The Company proposes to acquire certain properties from Aquila effective
    concurrently with and conditioned on the consummation of the Offering.
    Netherland, Sewell estimated reserves owned by Aquila as of December 31,
    1994. Since that time, Aquila has acquired additional property interests
    included in the amounts set forth above. Netherland, Sewell has estimated
    total proved reserves of Aquila as of December 31, 1994 in the approximate
    amounts of 2,781 Mbbls of oil, 106,535 MMcf of gas (totaling 20,537 Mboe),
    and $92 million of present value of estimated future net cash flows, before
    income taxes, discounted at 10% (which amounts exclude the properties
    acquired by Aquila in 1995).
 
                                       25
<PAGE>   27
 
(4) The reserves shown give effect to the pending disposition of certain Rocky
    Mountain properties valued at approximately $155 million, the sale of $20
    million in properties on April 1, 1995, the sale of $31 million in
    properties on May 1, 1995, and other smaller sales.
 
NATURAL GAS MARKETING
 
     During 1994, Apache sold approximately 89% of its U.S. natural gas on the
spot market through NGC Corporation (formerly Natural Gas Clearinghouse) ("NGC")
or through market responsive contracts with other parties; the remaining 11% was
sold through long-term, premium-priced contracts. Sales to NGC accounted for 37%
of the Company's oil and gas revenues in 1994. Apache has notified NGC that it
does not intend to continue its arrangement with NGC beyond its current term,
which expires in September 1995. The Company believes that such termination will
not have a material adverse effect on the Company due to the existence of
alternative marketing arrangements and purchasers. The Company is exploring
alternative means to market its gas following termination of such arrangement.
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The Company's authorized capital stock consists of 5,000,000 shares of
preferred stock, none of which was outstanding as of June 30, 1995, and
215,000,000 shares of Common Stock, of which 69,914,519 shares were outstanding
as of June 30, 1995.
 
     The descriptions set forth below of the Common Stock and preferred stock
constitute brief summaries of certain provisions of the Company's Restated
Certificate of Incorporation and Bylaws and are qualified in their entirety by
reference to the relevant provisions of such documents, both of which are listed
as exhibits to the Registration Statement of which this Prospectus is a part and
are incorporated herein by reference.
 
COMMON STOCK
 
     All outstanding shares of Common Stock are fully paid and nonassessable.
All holders of Common Stock have full voting rights and are entitled to one vote
for each share held of record on all matters submitted to a vote of the
stockholders. The Board of Directors of the Company is classified into three
groups of approximately equal size, one-third elected each year. Stockholders do
not have the right to cumulate votes in the election of directors and have no
preemptive or subscription rights. The Common Stock is neither redeemable nor
convertible, and there are no sinking fund provisions relating to such stock.
 
     Subject to preferences that may be applicable to any shares of preferred
stock outstanding at the time, holders of Common Stock are entitled to dividends
when, as and if declared by the Board of Directors from funds legally available
therefor and are entitled, in the event of liquidation, to share ratably in all
assets remaining after payment of liabilities.
 
     The Company's current policy is to reserve one share of Common Stock for
each share issued in order to provide for possible exercises of Common Stock
purchase rights under the Company's existing Rights Agreement.
 
     The Common Stock and the Common Stock purchase rights are listed on the
NYSE and the CSE. Norwest Bank Minnesota, National Association is the transfer
agent and registrar for the Common Stock.
 
     The Company typically mails its annual report to stockholders within 120
days after the end of its fiscal year. Notices of stockholder meetings are
mailed to record holders of Common Stock at their addresses shown on the books
of the transfer agent and registrar.
 
SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW
 
     Section 203 of the Delaware General Corporation Law ("DGCL") prevents an
"interested stockholder" (defined in Section 203, generally, as a person owning
15% or more of a corporation's outstanding voting stock) from engaging in a
"business combination" (as defined in Section 203) with a publicly-held Delaware
corporation for three years following the time such person became an interested
stockholder unless (i) before
 
                                       26
<PAGE>   28
 
such person became an interested stockholder, the board of directors of the
corporation approved the transaction in which the interested stockholder became
an interested stockholder or approved the business combination; (ii) upon
consummation of the transaction that resulted in the interested stockholder's
becoming an interested stockholder, the interested stockholder owned at least
85% of the voting stock of the corporation outstanding at the time the
transaction commenced (excluding stock held by directors who are also officers
of the corporation and by employee stock plans that do not provide participants
with the rights to determine confidentially whether shares held subject to the
plan will be tendered in a tender or exchange offer); or (iii) following the
transaction in which such person became an interested stockholder, the business
combination is approved by the board of directors of the corporation and
authorized at a meeting of stockholders by the affirmative vote of the holders
of two-thirds of the outstanding voting stock of the corporation not owned by
the interested stockholder. The provisions of Section 203 may have the effect of
delaying, deferring or preventing a change of control of the Company.
 
RIGHTS
 
     On January 10, 1986, the Board of Directors declared a dividend of one
right to purchase one share of Common Stock at $50 per share (subject to
adjustment) on each outstanding share of Common Stock (the "Rights"). The Rights
are exercisable only after a person (other than the Company or its employee
benefit plans), together with all persons acting in concert with it, has
acquired 20% or more of the Common Stock, or has commenced a tender offer for
30% or more of the Common Stock. If the Company engages in certain business
combinations or a 20% shareholder engages in certain transactions with the
Company, the Rights become exercisable for the Common Stock or common stock of
the corporation acquiring the Company (as the case may be) at 50% of the then
market price. Any Rights that are or were beneficially owned by a person who has
acquired 20% or more of the Common Stock and who engages in certain transactions
or realizes the benefits of certain transactions with the Company will become
void. The Company may redeem the Rights at a specified price at any time until
ten business days after public announcement that a person has acquired 20% or
more of the outstanding shares of Common Stock. The Rights will expire on
January 31, 1996, unless earlier redeemed by the Company. The Company is
considering successor arrangements. Unless the Rights have been previously
redeemed, all shares of Common Stock issued by the Company will include Rights,
including the Common Stock offered hereby.
 
PREFERRED STOCK
 
     No preferred stock is outstanding. Shares of preferred stock may be issued
by the Board of Directors with such voting powers and in such classes and
series, and with such designations, preferences, and relative, participating,
optional or other special rights, qualifications, limitations or restrictions
thereof, as may be stated and expressed in the resolution or resolutions
providing for the issue of such stock. The Company has no current plans to issue
any preferred stock.
 
CHANGE OF CONTROL
 
     The Company's Restated Certificate of Incorporation includes provisions
designed to prevent the use of certain tactics in connection with a potential
takeover of the Company. Article Twelve of the Restated Certificate of
Incorporation generally stipulates that the affirmative vote of 80% of the
Company's voting shares is required to adopt any agreement for the merger or
consolidation of the Company with or into any other corporation which is the
beneficial owner of more than 5% of the Company's voting shares. Article Twelve
further provides that such an 80% approval is necessary to authorize any sale or
lease of assets between the Company and any beneficial holder of 5% or more of
the Company's voting shares. Article Fourteen of the Restated Certificate of
Incorporation contains a "fair price" provision which requires that any tender
offer made by a beneficial owner of more than 5% of the outstanding voting stock
of the Company in connection with any plan of merger, consolidation or
reorganization, any sale or lease of substantially all of the Company's assets,
or any issuance of equity securities of the Company to the 5% stockholder must
provide at least as favorable terms to each holder of Common Stock other than
the stockholder making the tender offer. Article Fifteen of the Restated
Certificate of Incorporation contains an "anti-greenmail" mechanism which
 
                                       27
<PAGE>   29
 
prohibits the Company from acquiring any voting stock from the beneficial owner
of more than 5% of the outstanding voting stock of the Company, except for
acquisitions pursuant to a tender offer to all holders of voting stock on the
same price, terms and conditions, acquisitions in compliance with Rule 10b-18 of
the Exchange Act and acquisitions at a price not exceeding the market value per
share. Article Sixteen of the Restated Certificate of Incorporation prohibits
the stockholders of the Company from acting by written consent in lieu of a
meeting.
 
                                  UNDERWRITING
 
     Subject to the terms and conditions set forth in an underwriting agreement
(the "Purchase Agreement"), the Company has agreed to sell to each of the
Underwriters named below, and each of the Underwriters, for whom Merrill Lynch,
Pierce, Fenner & Smith Incorporated and Dean Witter Reynolds Inc. are acting as
representatives (the "Representatives"), has severally agreed to purchase the
shares set forth opposite its name below. In the Purchase Agreement, the several
Underwriters have agreed, subject to the terms and conditions set forth therein,
to purchase all the shares offered hereby if any of the shares are purchased. In
the event of default by an Underwriter, the Purchase Agreement provides that, in
certain circumstances, purchase commitments of the nondefaulting Underwriters
may be increased or the Purchase Agreement may be terminated.
 
<TABLE>
<CAPTION>
                                
                                                                             NUMBER
                     UNDERWRITER                                            OF SHARES
                     -----------                                            ---------
        <S>                                                                 <C>
        Merrill Lynch, Pierce, Fenner & Smith
                     Incorporated.........................................
        Dean Witter Reynolds Inc..........................................
                                                                            ---------
                     Total................................................  6,800,000
                                                                            =========
</TABLE>
 
     The Representatives of the Underwriters have advised the Company that they
propose initially to offer the shares of Common Stock to the public at the
public offering price set forth on the cover page of this Prospectus, and to
certain dealers at such price less a concession not in excess of $          per
share. The Underwriters may allow, and such dealers may reallow, a discount not
in excess of $          per share on sales to certain other dealers. After the
initial public offering, the public offering price, concession and discount may
be changed.
 
     The Company has granted to the Underwriters an option exercisable for 30
days after the date hereof to purchase up to 1,020,000 additional shares of
Common Stock to cover over-allotments, if any, at the initial public offering
price, less the underwriting discount. If the Underwriters exercise this option,
each of the Underwriters will have a firm commitment, subject to certain
conditions, to purchase approximately the same percentage thereof which the
number of shares of Common Stock to be purchased by it shown in the foregoing
table is of the 6,800,000 shares of Common Stock initially offered hereby.
 
     The Company has agreed to indemnify the several Underwriters against
certain liabilities, including liabilities under the Securities Act, or to
contribute to payments that the Underwriters may be required to make in respect
thereof.
 
     The Company has agreed not to sell or otherwise dispose of any shares of
Common Stock or securities convertible into or exchangeable or exercisable for
Common Stock for a period of 90 days after the date of this Prospectus in a
public offering or, subject to certain conditions, in a private offering,
without the prior written consent of the Representatives, except for certain
sales in connection with acquisitions of interests in oil and gas properties,
issuances pursuant to the Company's employee benefit plans or issuances upon the
conversion, exchange or exercise of outstanding securities convertible into or
exchangeable or exercisable for Common
 
                                       28
<PAGE>   30
 
Stock. If any such consent is given, it would not necessarily be preceded or
followed by a public announcement thereof.
 
                                 LEGAL MATTERS
 
     Certain legal matters regarding the Shares of Common Stock offered hereby
under laws other than federal or state securities laws have been passed upon for
the Company by its Vice President and General Counsel, Z. S. Kobiashvili. As of
the date of this Prospectus, Mr. Kobiashvili owns 541 shares of Common Stock
through the Company's retirement/401(k) savings plan and holds employee stock
options to purchase 20,000 shares of Common Stock, of which 2,500 options are
currently exercisable. Certain legal matters in connection with the Offering
will also be passed upon for the Company by Andrews & Kurth L.L.P., Houston,
Texas, and for the Underwriters by Baker & Botts, L.L.P., Houston, Texas.
 
                                    EXPERTS
 
     The audited consolidated financial statements of the Company and the
audited statement of Combined Revenues and Direct Operating Expenses for the Oil
and Gas Properties of Texaco Exploration and Production Inc. Sold to Apache
Corporation, each incorporated by reference into this Prospectus, have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their reports with respect thereto. In its report on the consolidated financial
statements of the Company, that firm states that with respect to DEKALB its
opinion is based on the report of other independent public accountants, namely
Coopers & Lybrand. The financial statements referred to above have been
incorporated by reference or included herein in reliance upon the authority of
those firms as experts in accounting and auditing in giving said reports.
 
     The audited consolidated financial statements of DEKALB incorporated by
reference in this Registration Statement have been audited by Coopers & Lybrand,
Chartered Accountants, as indicated in their report with respect thereto, and
are incorporated herein in reliance upon the authority of said firm as experts
in accounting and auditing in giving said reports.
 
     The information included and incorporated by reference herein regarding the
total proved reserves of the Company was prepared by the Company and reviewed by
Ryder Scott Company Petroleum Engineers ("Ryder Scott") as stated in their
letter report with respect thereto. The information included and incorporated by
reference herein regarding the total estimated proved reserves acquired from
Texaco was prepared by the Company and reviewed by Ryder Scott as stated in
their letter with respect thereto. The information included and incorporated by
reference herein regarding the total proved reserves of DEKALB was prepared by
DEKALB and reviewed by Ryder Scott as stated in their letter report with respect
thereto. The reserve review letters of Ryder Scott are filed as exhibits to the
Registration Statement of which this Prospectus is a part, in reliance upon the
authority of said firm as experts with respect to the matters covered by their
reports and the giving of their reports.
 
     A portion of the information included herein regarding the total proved
reserves of Aquila proposed to be acquired by the Company was prepared by
Netherland, Sewell & Associates, Inc. ("Netherland, Sewell") as of December 31,
1994, as stated in their letter report with respect thereto. Netherland, Sewell
has not reviewed any of the reserves of Aquila acquired during 1995, including
those set forth in this Prospectus on a pro forma basis as of December 31, 1994.
The reserve review letter of Netherland, Sewell is filed as an exhibit to the
Registration Statement of which this Prospectus is a part in reliance upon the
authority of said firm as experts with respect to the matters covered by their
report and the giving of their report.
 
                                       29
<PAGE>   31
 
                             AVAILABLE INFORMATION
 
     Apache is subject to the informational requirements of the Exchange Act,
and in accordance therewith, files periodic reports, proxy statements and other
information with the Commission. The Company's filings may be inspected and
copied or obtained by mail upon payment of the Commission's prescribed rates at
the public reference facilities maintained by the Commission at 450 Fifth
Street, N.W., Room 1024, Judiciary Plaza, Washington, D.C. 20549 and at the
regional offices of the Commission located at Seven World Trade Center, 13th
Floor, New York, New York 10048 and CitiCorp Center, 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661. The Common Stock and associated Rights are
listed on the NYSE and the CSE. Although the Shares of Common Stock offered
hereby are not currently admitted for trading on either exchange, applications
have been made to list the Shares on both the NYSE and the CSE. The Company's
9.25% Notes due June 1, 2002 are listed on the NYSE. The Company's reports,
proxy statements and other filings with the Commission are also available for
inspection at the offices of the NYSE located at 20 Broad Street, New York, New
York 10005 and the CSE, 440 S. LaSalle St., Chicago, Illinois 60605.
 
     The Company has filed with the Commission a Registration Statement on Form
S-3 under the Securities Act with respect to the Common Stock offered hereby.
This Prospectus does not contain all of the information set forth in the
Registration Statement and in the amendments, exhibits and schedules thereto.
For further information with respect to the Company and the Common Stock,
reference is made to the Registration Statement, and to the exhibits and
schedules filed therewith. All of these documents may be inspected without
charge at the Commission's principal office in Washington, D.C., and copies
thereof may be obtained from the Commission at the prescribed rates or may be
examined without charge at the public reference facilities of the Commission.
Any statements contained herein concerning the provisions of any document filed
as an exhibit to the Registration Statement or otherwise filed with the
Commission are not necessarily complete, and in each instance reference is made
to the copy of such document so filed. Each such statement shall be qualified in
its entirety by such reference.
 
                                       30
<PAGE>   32
------------------------------------------------------------------------------- 
-------------------------------------------------------------------------------
 
  NO DEALER, SALESPERSON OR OTHER INDIVIDUAL HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED OR
INCORPORATED BY REFERENCE IN THIS PROSPECTUS, AND IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY OR ANY UNDERWRITER. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER
TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, THE COMMON STOCK IN ANY
JURISDICTION WHERE, OR TO ANY PERSON TO WHOM, IT IS UNLAWFUL TO MAKE SUCH OFFER
OR SOLICITATION IN SUCH JURISDICTION. NEITHER THE DELIVERY OF THIS PROSPECTUS
NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO
THE DATE HEREOF OR THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY
SINCE SUCH DATE.
 
                             ---------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
<S>                                    <C>
Information Incorporated by
  Reference............................      2
Prospectus Summary.....................      3
Risk Factors...........................      9
Use of Proceeds........................     12
Price Range of Common Stock and
  Dividends............................     12
Capitalization.........................     13
Selected Consolidated Financial,
  Operating and Reserve Data...........     14
Management's Discussion and Analysis of
  Financial Condition and Results of
  Operations...........................     16
The Company............................     21
Recent Developments....................     24
Description of Capital Stock...........     26
Underwriting...........................     28
Legal Matters..........................     29
Experts................................     29
Available Information..................     30
</TABLE>

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

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

                                6,800,000 SHARES
 
                                      LOGO
 
                                  COMMON STOCK
 
                          ---------------------------
 
                                   PROSPECTUS
                          ---------------------------
 
                              MERRILL LYNCH & CO.
 

                           DEAN WITTER REYNOLDS INC.
 
                                            , 1995
 

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

<PAGE>   33
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
<TABLE>
    <S>                                                                              <C>
    Registration fee................................................................ $ 72,133
    NYSE additional listing fee.....................................................   27,370
    Printing expenses............................................................... *150,000
    Blue Sky fees and expenses......................................................  *10,000
    Legal fees and expenses.........................................................  *75,000
    Accounting fees and expenses....................................................  *75,000
    Transfer agent and registrar fees...............................................  * 1,000
    Miscellaneous fees and expenses.................................................   39,497
                                                                                     --------
              Total................................................................. $450,000
                                                                                     ========
</TABLE>
 
---------------
 
* Estimated
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145 of the Delaware General Corporation Law, inter alia, authorizes
a corporation to indemnify any person who was or is a party or is threatened to
be made a party to any threatened, pending or completed action, suit or
proceeding (other than an action by or in the right of the corporation) because
such person is or was a director, officer, employee or agent of the corporation
or was serving at the request of the corporation as a director, officer,
employee or agent of another corporation or other enterprise, against expenses
(including attorneys' fees), judgments, fines and amounts paid in settlement
actually and reasonably incurred by him in connection with such suit or
proceeding if he acted in good faith and in a manner he reasonably believed to
be in or not opposed to the best interests of the corporation, and, with respect
to any criminal action or proceeding, had no reason to believe his conduct was
unlawful. Similar indemnity is authorized for such persons against expenses
(including attorneys' fees) actually and reasonably incurred in defense or
settlement of any such pending, completed or threatened action or suit by or in
the right of the corporation if such person acted in good faith and in a manner
he reasonably believed to be in or not opposed to the best interests of the
corporation, and provided further that (unless a court of competent jurisdiction
otherwise provides) such person shall not have been adjudged liable to the
corporation. Any such indemnification may be made only as authorized in each
specific case upon a determination by the stockholders or disinterested
directors that indemnification is proper because the indemnity has met the
applicable standard of conduct.
 
     Section 145 further authorizes a corporation to purchase and maintain
insurance on behalf of any person who is or was a director, officer, employee or
agent of the corporation, or is or was serving at the request of the corporation
as a director, officer, employee or agent of another corporation or enterprise,
against any liability asserted against him and incurred by him in any such
capacity, or arising out of his status as such, whether or not the corporation
would otherwise have the power to indemnify him. The Company maintains policies
insuring its and its subsidiaries' officers and directors against certain
liabilities for actions taken in such capacities, including liabilities under
the Securities Act.
 
     Article VII of the Company's Bylaws provides, in substance, that directors,
officers, employees and agents of the Company shall be indemnified to the extent
permitted by Section 145 of the Delaware General Corporation Law. Additionally,
Article Seventeen of the Company's Restated Certificate of Incorporation
eliminates in certain circumstances the monetary liability of directors of the
Company for a breach of their fiduciary duty as directors. These provisions do
not eliminate the liability of a director (i) for a breach of the director's
duty of loyalty to the Company or its stockholders; (ii) for acts or omissions
by the director not in good faith; (iii) for acts or omissions by a director
involving intentional misconduct or a knowing violation of the law; (iv) under
Section 174 of the Delaware General Corporation Law (relating to the declaration
of dividends and purchase or redemption of shares in violation of the Delaware
General Corporation Law); and (v) for transactions from which the director
derived an improper personal benefit.
 
                                      II-1
<PAGE>   34
 
ITEM 16. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
(a) Exhibits
 
<TABLE>
<C>                  <S>
         1.1         -- Form of Purchase Agreement between Apache Corporation and the
                        Underwriters named therein.(1)

         4.1         -- Restated Certificate of Incorporation of Apache Corporation
                        (incorporated by reference to Exhibit 3.1 to Apache's Annual Report
                        on Form 10-K for the fiscal year ended December 31, 1993, Commission
                        File No. 1-4300).

         4.2         -- Bylaws of Apache Corporation as of July 31, 1995 (incorporated by
                        reference to Exhibit 4.2 of Apache's Registration Statement on Form
                        S-4, Registration No. 33-61669, filed with the Commission on August
                        8, 1995).

         4.3         -- Form of common stock certificate (incorporated by reference to
                        Exhibit 4.4 to Amendment No. 1 to Apache's Registration Statement on
                        Form S-3, Registration No. 33-5097, filed with the Commission on May
                        16, 1986).

         4.4         -- Rights Agreement dated as of January 10, 1986 between the Company and
                        First Trust Company, Inc., rights agent, relating to the declaration
                        of Rights to the Company's common stockholders of record on January
                        24, 1986 (incorporated by reference to Exhibit 4.9 of Apache's Annual
                        Report on Form 10-K for the fiscal year ended December 31, 1985,
                        Commission File No. 1-4300).

         5.1         -- Opinion of legal counsel regarding legality of securities being
                        registered.(1)

        23.1         -- Consent of Arthur Andersen LLP.(1)

        23.2         -- Consent of Coopers & Lybrand, Chartered Accountants.(1)

        23.3         -- Consent of Ryder Scott Company Petroleum Engineers ("Ryder
                        Scott").(1)

        23.4         -- Consent of Netherland, Sewell & Associates, Inc.(1)

        23.5         -- Consent of legal counsel (included in Exhibit 5.1).(1)

        24.1         -- Power of Attorney (included in Part II as a part of the signature
                        pages of the Registration Statement).(1)

        99.1         -- Reports of Ryder Scott dated January 20 and January 23, 1995.(1)

        99.2         -- Report of Ryder Scott dated February 6, 1995.(1)

        99.3         -- Report of Ryder Scott dated August 21, 1995.(1)

        99.4         -- Report of Netherland, Sewell & Associates, Inc., dated January 19,
                        1995.(1)
</TABLE>
 
---------------
 
(1) Filed herewith.
 
ITEM 17. UNDERTAKINGS
 
     The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
     The undersigned registrant hereby undertakes that:
 
          (1) For purposes of determining liability under the Securities Act of
     1933, the information omitted from the form of prospectus filed as part of
     this registration statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act of 1933 shall be deemed to be part
     of this registration statement as of the time it was declared effective.
 
                                      II-2
<PAGE>   35
 
          (2) For the purpose of determining any liability under the Securities
     Act of 1933, each post-effective amendment that contains a form of
     prospectus shall be deemed to be a new registration statement relating to
     the securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities Act
of 1933 and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act of 1933 and will be governed by the final adjudication of such issue.
 
                                      II-3
<PAGE>   36
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized in the City of Houston, State of Texas.
 
                                            APACHE CORPORATION
 
Date: August 28, 1995                       By:    /s/  RAYMOND PLANK
                                                -------------------------------
                                                       Raymond Plank,
                                            Chairman and Chief Executive Officer
 
                               POWER OF ATTORNEY
 
     The undersigned directors and officers of Apache Corporation do hereby
constitute and appoint Raymond Plank, G. Steven Farris, Clyde E. McKenzie, Z.S.
Kobiashvili and Mark A. Jackson, and each of them, with full power of
substitution, our true and lawful attorneys-in-fact and agents to do any and all
acts and things in our name and behalf in our capacities as directors and
officers, and to execute any and all instruments for us and in our names in the
capacities indicated below which such person may deem necessary or advisable to
enable Apache Corporation to comply with the Securities Act of 1933, as amended,
and any rules, regulations and requirements of the Securities and Exchange
Commission, in connection with this Registration Statement, including
specifically, but not limited to, power and authority to sign for us, or any of
us, in the capacities indicated below any and all amendments (including
post-effective amendments) hereto; and we do hereby ratify and confirm all that
such person or persons shall do or cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons, in the
capacities and on the dates indicated. (Apache Corporation does not have a
Principal Financial Officer.)
 
<TABLE>
<CAPTION>
                  SIGNATURE                               TITLE                     DATE
                  ---------                               -----                     ----
<C>                                            <S>                           <C>
             /s/  RAYMOND PLANK                Chairman and Chief                August 28, 1995
---------------------------------------------    Executive Officer
               (Raymond Plank)                   (Principal Executive
                                                 Officer)

            /s/  MARK A. JACKSON               Vice President, Finance           August 28, 1995
---------------------------------------------
              (Mark A. Jackson)

             /s/  R. KENT SAMUEL               Controller and Chief              August 28, 1995
---------------------------------------------    Accounting Officer
              (R. Kent Samuel)                   (Principal Accounting
                                                 Officer)
</TABLE>
 
                                      II-4
<PAGE>   37
 
<TABLE>
<CAPTION>
                  SIGNATURE                               TITLE                     DATE
                  ---------                               -----                     ----
<C>                                            <S>                           <C>
           /s/  FREDERICK M. BOHEN             Director                          August 28, 1995
---------------------------------------------
            (Frederick M. Bohen)

             /s/  VIRGIL B. DAY                Director                          August 28, 1995
---------------------------------------------
               (Virgil B. Day)

            /s/  G. STEVEN FARRIS              Director                          August 28, 1995
---------------------------------------------
             (G. Steven Farris)

           /s/  RANDOLPH M. FERLIC             Director                          August 28, 1995
---------------------------------------------
            (Randolph M. Ferlic)

           /s/  EUGENE C. FIEDOREK             Director                          August 28, 1995
---------------------------------------------
            (Eugene C. Fiedorek)

            /s/  W. BROOKS FIELDS              Director                          August 28, 1995
---------------------------------------------  
             (W. Brooks Fields)

          /s/  ROBERT V. GISSELBECK            Director                          August 28, 1995
---------------------------------------------
           (Robert V. Gisselbeck)

          /s/  STANLEY K. HATHAWAY             Director                          August 28, 1995
---------------------------------------------
            (Stanley K. Hathaway)

             /s/  JOHN A. KOCUR                Director                          August 28, 1995
---------------------------------------------
               (John A. Kocur)

             /s/  JOSEPH A. RICE               Director                          August 28, 1995
---------------------------------------------
              (Joseph A. Rice)
</TABLE>
 
                                      II-5
<PAGE>   38
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
      EXHIBIT                               DESCRIPTION OF EXHIBIT
--------------------------------------------------------------------------------------------
<C>                <S>
       1.1         -- Form of Purchase Agreement between Apache Corporation and the
                      Underwriters named therein.(1)

       4.1         -- Restated Certificate of Incorporation of Apache Corporation
                      (incorporated by reference to Exhibit 3.1 to Apache's Annual Report on
                      Form 10-K for the fiscal year ended December 31, 1993, Commission File
                      No. 1-4300).

       4.2         -- Bylaws of Apache Corporation as of July 31, 1995 (incorporated by
                      reference to Exhibit 4.2 of Apache's Registration Statement on Form
                      S-4, Registration No. 33-61669, filed with the Commission on August 8,
                      1995).

       4.3         -- Form of common stock certificate (incorporated by reference to Exhibit
                      4.4 to Amendment No. 1 to Apache's Registration Statement on Form S-3,
                      Registration No. 33-5097, filed with the Commission on May 16, 1986).

       4.4         -- Rights Agreement dated as of January 10, 1986 between the Company and
                      First Trust Company, Inc., rights agent, relating to the declaration
                      of Rights to the Company's common stockholders of record on January
                      24, 1986 (incorporated by reference to Exhibit 4.9 of Apache's Annual
                      Report on Form 10-K for the fiscal year ended December 31, 1985,
                      Commission File No. 1-4300).

       5.1         -- Opinion of legal counsel regarding legality of securities being
                      registered.(1)

      23.1         -- Consent of Arthur Andersen LLP.(1)

      23.2         -- Consent of Coopers & Lybrand, Chartered Accountants.(1)

      23.3         -- Consent of Ryder Scott Company Petroleum Engineers ("Ryder Scott").(1)

      23.4         -- Consent of Netherland, Sewell & Associates, Inc.(1)

      23.5         -- Consent of legal counsel (included in Exhibit 5.1).(1)

      24.1         -- Power of Attorney (included in Part II as a part of the signature
                      pages of the Registration Statement).(1)

      99.1         -- Reports of Ryder Scott dated January 20 and January 23, 1995.(1)

      99.2         -- Report of Ryder Scott dated February 6, 1995.(1)

      99.3         -- Report of Ryder Scott dated August 21, 1995.(1)

      99.4         -- Report of Netherland, Sewell & Associates, Inc., dated January 19,
                      1995.(1)
</TABLE>
 
---------------
 
(1) Filed herewith.

<PAGE>   1
                                                                     EXHIBIT 1.1

                                                                           DRAFT
                                                                         8/24/95





________________________________________________________________________________





                               APACHE CORPORATION


                                6,800,000 SHARES
                                  COMMON STOCK


                               PURCHASE AGREEMENT




                              MERRILL LYNCH & CO.
                           DEAN WITTER REYNOLDS INC.





________________________________________________________________________________
<PAGE>   2
                                6,800,000 SHARES
                               APACHE CORPORATION
                            (A DELAWARE CORPORATION)

                                  COMMON STOCK
                          (PAR VALUE $1.25 PER SHARE)


                               PURCHASE AGREEMENT

                                                       _______________ ___, 1995

MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
  Incorporated and
DEAN WITTER REYNOLDS INC.
  as Representatives of the
  several Underwriters
c/o MERRILL LYNCH & CO.
      Merrill Lynch, Pierce, Fenner & Smith
        Incorporated
      World Financial Center
      North Tower
      250 Vesey Street
      New York, New York  10281

Dear Sirs:

                 Apache Corporation, a Delaware corporation (the "Company"),
confirms its agreement with you and each of the other underwriters named in
Schedule A hereto (collectively, the "Underwriters," which term shall also
include any underwriters substituted as hereinafter provided in Section 10
hereof), for whom Merrill Lynch & Co., Merrill, Lynch, Pierce, Fenner & Smith
Incorporated ("Merrill Lynch") and Dean Witter Reynolds Inc. ("Dean Witter")
are acting as representatives (in such capacity, Merrill Lynch and Dean Witter
and shall hereinafter be collectively referred to as the "Representatives"),
with respect to the sale by the Company of an aggregate of 6,800,000 shares of
Common Stock, par value $1.25 per share, of the Company ("Common Stock"), and
the purchase by the Underwriters, acting severally and not jointly, of the
respective number of shares of Common Stock set forth in Schedule A hereto, and
with respect to the grant by the Company to the Underwriters of the option
described in Section 2 hereof to purchase all or any part of up to an
additional 1,020,000 shares of Common Stock to cover over-allotments, in each
case except as may otherwise be provided in the Pricing Agreement, as
hereinafter defined.  The 6,800,000 shares of Common Stock (the "Initial
Securities") together with all or any part of the 1,020,000 shares of Common
Stock subject to





                                      -1-
<PAGE>   3
the option described in Section 2 hereof (the "Option Securities"), are
collectively hereinafter called the "Securities."

                 Prior to the purchase and public offering of the Securities by
the several Underwriters, the Company and the Representatives, acting on behalf
of the several Underwriters, shall enter into an agreement substantially in the
form of Exhibit A hereto (the "Pricing Agreement"). The Pricing Agreement may
take the form of an exchange of any standard form of written telecommunication
between the Company and the Representatives and shall specify such applicable
information as is indicated in Exhibit A hereto.  The offering of the
Securities will be governed by this Agreement, as supplemented by the Pricing
Agreement.  From and after the date of the execution and delivery of the
Pricing Agreement, this Agreement shall be deemed to incorporate the Pricing
Agreement.

                 The Company has filed with the Securities and Exchange
Commission (the "Commission") a registration statement on Form S-3 (No.
33-_______) and a related preliminary prospectus for the registration of the
Securities and associated rights to purchase Common Stock (the "Rights") under
the Securities Act of 1933, as amended (the "1933 Act"), and has filed such
amendments thereto, if any, and such amended preliminary prospectus as may have
been required to the date hereof, and will file such additional amendments
thereto and such amended prospectuses as may hereafter be required.  Such
registration statement (as amended, if applicable) and the prospectus
constituting a part thereof at the time such registration statement becomes
effective (including in each case all documents incorporated by reference
therein and the information, if any, deemed to be part thereof pursuant to Rule
430A(b) of the rules and regulations of the Commission under the 1933 Act (the
"1933 Act Regulations")), as from time to time amended or supplemented pursuant
to the 1933 Act, the Securities Exchange Act of 1934, as amended (the "1934
Act"), or otherwise, are hereinafter referred to as the "Registration
Statement" and the "Prospectus," respectively, except that if any revised
prospectus shall be provided to the Underwriters by the Company for use in
connection with the offering of the Securities and the associated Rights which
differs from the Prospectus on file at the Commission at the time the
Registration Statement becomes effective (whether or not such revised
prospectus is required to be filed by the Company pursuant to Rule 424(b) of
the 1933 Act Regulations), the terms "Prospectus" shall refer to each such
revised prospectus from and after the time it is first provided to the
Underwriters for such use.  All references in this Agreement to financial
statements and schedules and other information which is "contained,"
"included," "described" or "stated" in the Registration Statement or the
Prospectus (and all other references of like import) shall be deemed to mean
and include all such financial statements and schedules and other information
which is or is deemed to be incorporated by reference in the Registration
Statement or the Prospectus, as the case may be; and all references in this
Agreement to amendments or supplements to the Registration Statement or the
Prospectus shall be deemed to mean and include the filing of any document under
the 1934 Act which is or is deemed to be incorporated by reference in the
Registration Statement or the Prospectus, as the case may be.





                                      -2-
<PAGE>   4
                 The Company understands that the Underwriters propose to make
a public offering of the Securities as soon as the Representatives deem
advisable after the Registration Statement becomes effective and the Pricing
Agreement has been executed and delivered.

                 SECTION 1.  Representations and Warranties.

                 (a)      The Company represents and warrants to each of the
Underwriters as of the date hereof and as of the date of the Pricing Agreement
(such latter date being hereinafter referred to as the "Representation Date")
as follows:

                          (i)     At the time the Registration Statement
         becomes effective, the Registration Statement will comply in all
         material respects with the requirements of the 1933 Act and the 1933
         Act Regulations and will not contain an untrue statement of a material
         fact or omit to state a material fact required to be stated therein or
         necessary to make the statements therein not misleading. The
         Prospectus, at the Representation Date (unless the term "Prospectus"
         refers to a prospectus which has been provided to the Underwriters by
         the Company for use in connection with the offering of the Securities
         and the associated Rights which differ from the Prospectus on file at
         the Commission at the time the Registration Statement becomes
         effective, in which case at the time it is first provided to the
         Underwriters for such use) and at Closing Time and each Date of
         Delivery referred to in Section 2 hereof, will not include an untrue
         statement of a material fact or omit to state a material fact
         necessary in order to make the statements therein, in the light of the
         circumstances under which they were made, not misleading; provided,
         however, that the representations and warranties in this subsection
         shall not apply to statements in or omissions from the Registration
         Statement or Prospectus made in reliance upon and in conformity with
         information furnished to the Company in writing by the Underwriters
         through the Representatives expressly for use in the Registration
         Statement or Prospectus.  The Company meets all conditions required
         for the use of Form S-3 to effect the registration of the Securities
         and the associated Rights under the Securities Act.

                          (ii)    The accountants who certified the financial
         statements and supporting schedules included in the Registration
         Statement or incorporated by reference therein are independent public
         accountants with respect to the Company, DEKALB Energy Company, a
         Delaware corporation ("DEKALB"), and their respective subsidiaries and
         interests in oil and gas ventures and partnerships (the "Consolidated
         Subsidiaries") and Texaco Exploration and Production Inc., a Delaware
         corporation ("Texaco"), as required by the 1933 Act Regulations.

                          (iii)   The petroleum engineers who have consented to
         being named as having reviewed certain reserve data included in the
         Registration Statement or incorporated by reference therein are
         independent engineers with respect to the Company, DEKALB, Texaco and
         the Consolidated Subsidiaries.





                                      -3-
<PAGE>   5
                          (iv)    The financial statements, including the notes
         thereto, and supporting schedules included in the Registration
         Statement or incorporated by reference therein present fairly the
         financial position of the Company and the Consolidated Subsidiaries,
         DEKALB and Texaco as at the dates indicated and the results of their
         operations for the periods specified; except as otherwise stated in
         the Registration Statement, said financial statements have been
         prepared in conformity with generally accepted accounting principles
         applied on a consistent basis; and the supporting schedules included
         in the Registration Statement or incorporated by reference therein
         present fairly the information required to be stated therein.

                          (v)     The pro forma financial information included
         in the Registration Statement or incorporated by reference therein
         presents fairly the information shown therein, has been prepared on
         the basis of the assumptions described in the Registration Statement
         and the assumptions used in the preparation thereof are reasonable.

                          (vi)    The information on the basis of which the
         reserve estimates and related information included in the Registration
         Statement or incorporated by reference therein  were prepared by the
         Company, its subsidiaries, Ryder Scott Company Petroleum Engineers or
         any other person is true and correct in all material respects.

                          (vii)   Since the respective dates as of which
         information is given in the Registration Statement and the Prospectus,
         except as otherwise stated therein, (A) there has been no material
         adverse change in the condition, financial or otherwise, or the
         earnings, affairs or business prospects of the Company and the
         Consolidated Subsidiaries considered as one enterprise, whether or not
         arising in the ordinary course of business, (B) there have been no
         transactions entered into by the Company or any of its Subsidiaries
         other than those in the ordinary course of business, which are
         material with respect to the Company and the Consolidated Subsidiaries
         considered as one enterprise, and (C) except for regular quarterly
         dividends, there has been no dividend or distribution of any kind
         declared, paid or made by the Company on any class of its capital
         stock.

                          (viii)  The Company has been duly incorporated and is
         validly existing as a corporation in good standing under the laws of
         the State of Delaware with corporate power and authority to own, lease
         and operate its properties and conduct its business as described in
         the Prospectus and to enter into and perform its obligations under
         this Agreement and the Pricing Agreement; and the Company is duly
         qualified as a foreign corporation to transact business and is in good
         standing in all jurisdictions in which such qualification is required,
         whether by reason of the ownership or leasing of property or the
         conduct of business, except where the failure so to qualify would not
         have a material adverse effect on the condition, financial or
         otherwise, or the earnings, affairs or business prospects of the
         Company and the Consolidated Subsidiaries considered as one
         enterprise.  Neither the Company nor any of its affiliates is doing
         business with any person or entity located in Cuba or with the
         Government of Cuba.





                                      -4-
<PAGE>   6
                          (ix)    Each corporation in which the Company has an
         interest that  constitutes a "significant subsidiary" of the Company
         as defined in the 1933 Act Regulations is specified in Schedule B
         hereto (the subsidiaries so specified being hereinafter collectively
         referred to as the "Corporate Subsidiaries").  Each Corporate
         Subsidiary has been duly incorporated and is validly existing as a
         corporation in good standing under the laws of the jurisdiction of its
         incorporation and is duly qualified as a foreign corporation to
         transact business and is in good standing in all jurisdictions in
         which such qualification is required, whether by reason of the
         ownership or leasing of property or the conduct of business, except
         where the failure so to qualify would not have a material adverse
         effect on the condition, financial or otherwise, or the earnings,
         affairs or business prospects of the Company and the Consolidated
         Subsidiaries considered as one enterprise; and all of the issued and
         outstanding capital stock of each Corporate Subsidiary has been duly
         authorized and validly issued, is fully paid and nonassessable and is
         owned by the Company, directly or indirectly, free and clear of any
         security interest, pledge, lien, encumbrance, claim or equity (except
         as described in the Prospectus).

                          [(x)    Each partnership in which the Company has an
         interest that constitutes a "significant subsidiary" of the Company as
         defined in the 1933 Act Regulations is specified in Schedule C hereto
         (the subsidiaries so specified being hereinafter collectively referred
         to as the "Partnership Subsidiaries," and together with the "Corporate
         Subsidiaries," the "Subsidiaries").  Each Partnership Subsidiary has
         been duly formed and is validly existing as a partnership in good
         standing under the laws of the jurisdiction of its formation and is
         duly qualified as a foreign partnership to transact business and is in
         good standing in all jurisdictions in which such qualification is
         required, whether by reason of the ownership or leasing of property or
         the conduct of business, except where the failure so to qualify would
         not have a material adverse effect on the condition, financial or
         otherwise, or the earnings or business affairs of the Company and its
         Subsidiaries considered as one enterprise; and all the outstanding
         partnership interests in each Partnership Subsidiary have been duly
         authorized and validly issued, are fully paid and nonassessable and
         are owned by the Company, directly or indirectly, free and clear of
         any pledge, lien, encumbrance, claim or equity (except as described in
         the Prospectus).]

                          (xi)    The authorized, issued and outstanding
         capital stock of the Company is as set forth in the Prospectus under
         "Capitalization" (except for issuances, if any, subsequent to the date
         of the Prospectus pursuant to reservations, agreements, employee
         benefit plans or the conversion of convertible securities referred to
         in the Prospectus); the shares of issued and outstanding Common Stock
         have been duly authorized and validly issued and are fully paid and
         nonassessable; the Rights associated with such shares of Common Stock
         have been duly and validly issued by the Company in accordance with
         the Rights Agreement dated as of January 10, 1986 (the "Rights
         Agreement") between the Company and First Trust Company, Inc.; the
         Securities have been duly authorized for issuance and sale to the
         Underwriters pursuant to this





                                      -5-
<PAGE>   7
         Agreement and, when issued and delivered by the Company pursuant to
         this Agreement against payment of the consideration set forth in the
         Pricing Agreement, will be validly issued and fully paid and
         nonassessable; the issuance of the Securities is not subject to
         preemptive or other similar rights; and the Common Stock and
         associated Rights conform to all statements relating thereto contained
         in the Prospectus.

                          (xii)   This Agreement has been duly and validly
         authorized by the Company and constitutes a valid and binding
         obligation of the Company enforceable in accordance with its terms.
         At the Representation Date, the Pricing Agreement will be duly and
         validly authorized by the Company and will constitute a valid and
         binding obligation of the Company enforceable in accordance with its
         terms.

                          (xiii)  Neither the Company nor any of its
         Subsidiaries is in violation of its charter or by-laws or in default
         in the performance or observance of any obligation, agreement,
         covenant or condition contained in any contract, indenture, mortgage,
         loan agreement, note, lease or other instrument to which the Company
         or any of its Subsidiaries is a party or by which it or any of them
         may be bound, or to which any of the property or assets of any of them
         is subject where the consequences of such default would have a
         material adverse effect on the condition, financial or otherwise, or
         the earnings, affairs or business prospects of the Company and the
         Consolidated Subsidiaries considered as one enterprise; and the
         execution, delivery and performance of this Agreement and the Pricing
         Agreement and the consummation of the transactions herein and therein
         contemplated have been duly and validly authorized by all necessary
         corporate action and will not conflict with or constitute a breach or
         violation of, or default under, or result in the creation or
         imposition of any lien, charge or encumbrance upon any property or
         assets of the Company or any of its Subsidiaries pursuant to any
         contract, indenture, mortgage, loan agreement, note, lease or other
         instrument to which the Company or any of the Consolidated
         Subsidiaries is a party or by which it or any of them may be bound, or
         to which any of the property or assets of the Company or any of the
         Consolidated Subsidiaries is subject, nor will such action result in
         any breach or violation of, or default under, the provisions of the
         charter or by-laws of the Company or of any law, administrative
         regulation or administrative or court decree to which the Company or
         any of the Consolidated Subsidiaries is subject.

                          (xiv)   There is no action, suit or proceeding before
         or by any court or governmental agency or body, domestic or foreign,
         now pending, or, to the knowledge of the Company, threatened, against
         the Company or any of the Consolidated Subsidiaries that is required
         to be disclosed in the Registration Statement (other than as disclosed
         therein), or that might (A) result in any material adverse change in
         the condition, financial or otherwise, or the earnings, affairs or
         business prospects of the Company and the Consolidated Subsidiaries
         considered as one enterprise, (B) materially and adversely affect the
         properties or assets thereof or (C) materially and adversely affect
         the consummation by the Company of its obligations pursuant to this
         Agreement; there is no pending legal or governmental proceeding to
         which the Company or any of the





                                      -6-
<PAGE>   8
         Consolidated Subsidiaries is a party or to which any of their
         respective properties or assets is subject that is not described in
         the Registration Statement, including ordinary routine litigation
         incidental to the Company's business, that might result in any
         material adverse change in the condition, financial or otherwise, or
         the earnings, affairs or business prospects of the Company and the
         Consolidated Subsidiaries considered as one enterprise; and there are
         no contracts or documents of the Company or any of its Subsidiaries
         that  are required to be filed as exhibits to the Registration
         Statement by the 1933 Act or the 1933 Act Regulations that have not
         been so filed.

                          (xv)    The Company and the Consolidated
         Subsidiaries, except as to their respective interests in oil and gas
         leases and other mineral rights and interests, have good and
         marketable title to all of the properties and assets, real or
         personal, owned by them, in each case free and clear of any security
         interests, mortgages, pledges, liens, encumbrances or charges of any
         kind, other than (A) those described in the Prospectus and (B) those
         that do not have a material adverse effect on the condition, financial
         or otherwise, or the earnings, affairs or business prospects of the
         Company and the Consolidated Subsidiaries considered as one
         enterprise.  The Company and the Consolidated Subsidiaries have valid
         and defensible title to their respective interests in oil and gas
         leases, free and clear of any security interests, mortgages, pledges,
         liens, encumbrances or charges of any kind, other than (A) those
         described in the Prospectus, (B) obligations or duties under
         applicable laws, ordinances, rules, regulations and orders of tribal
         or governmental authority, (C) liens and encumbrances under operating
         agreements, unitization and pooling agreements, production sales
         contracts, farm-out agreements and other oil and gas exploration and
         production agreements, in each case that secure payment of amounts not
         yet due and payable or the performance of other inchoate obligations
         and are of a scope and nature customary in connection with similar
         drilling and producing operations, and (D) those that do not have a
         material adverse effect on the condition, financial or otherwise, or
         the earnings, affairs or business prospects of the Company and the
         Consolidated Subsidiaries considered as one enterprise.  The Company
         and the Consolidated Subsidiaries have acquired their respective
         interests in oil and gas leases in such a manner as is customary in
         the oil and gas industry, and all oil and gas leases in which the
         Company or the Consolidated Subsidiaries have an interest are in full
         force and effect in accordance with their terms, except in the
         instances that do not have a material adverse effect on the condition,
         financial or otherwise, or the earnings, affairs or business prospects
         of the Company and the Consolidated Subsidiaries as one enterprise.

                          (xvi)    Each contract, agreement or arrangement to
         which the Company or any of its Subsidiaries is a party or by which it
         or any of them may be bound, or to which any of the property or assets
         of the Company or any of its Subsidiaries is subject, which is
         material to the condition, financial or otherwise, or the earnings or
         business affairs of the Company and the Consolidated Subsidiaries
         considered as one enterprise has been duly and validly authorized,
         executed and delivered and is in full force and effect in accordance
         with its terms; none of such contracts, agreements or arrangements





                                      -7-
<PAGE>   9
         has been assigned by the Company or any of its Subsidiaries, and the
         Company knows of no present condition or fact that would prevent
         compliance by the Company or any of its Subsidiaries or any other
         party thereto with the terms of any such contract, agreement or
         arrangement in accordance with its terms in all material respects;
         neither the Company nor any of its Subsidiaries has any present
         intention to exercise any right that it may have to cancel any such
         contract, agreement or arrangement or otherwise to terminate its
         rights and obligations thereunder, and none of them has any knowledge
         that any other party to any such contract, agreement or arrangement
         has any intention not to render full performance in all material
         respects as contemplated by the terms thereof.

                          (xvii)  The documents incorporated by reference into
         the Registration Statement or deemed to be incorporated therein, when
         they were filed (or, if an amendment was filed with respect to any
         such document, when such amendment was filed), conformed in all
         material respects to the requirements of the 1934 Act, and the rules
         and regulations of the Commission under the 1934 Act (the "1934 Act
         Regulations"), and any further documents hereafter incorporated by
         reference into the Registration Statement or deemed to be incorporated
         therein, when they are filed, will conform in all material respects to
         the requirements of the 1934 Act and the 1934 Act Regulations; none of
         such documents incorporated by reference into the Registration
         Statement or deemed to be incorporated therein, when it was filed (or,
         if an amendment was filed with respect to any such document, when such
         amendment was filed), contained an untrue statement of material fact
         or omitted to state a material fact required to be stated therein or
         necessary to make the statements therein not misleading, and no
         further documents hereafter incorporated by reference into the
         Registration Statement or deemed to be incorporated therein, when they
         are filed, will contain an untrue statement of material fact or omit
         to state a material fact required to be stated therein or necessary to
         make the statements therein not misleading.

                          (xviii) No authorization, approval or consent of any
         court or governmental authority or agency is necessary in connection
         with the sale of the Securities hereunder, except such as may be
         required under the 1933 Act or state securities laws for the offering
         and sale of the Securities.

                          (xix)   The Company and the Consolidated Subsidiaries
         possess such licenses, permits, consents, orders, certificates or
         authorizations issued by the appropriate federal, state or local
         regulatory agencies or bodies necessary to conduct their respective
         businesses as now operated by them, except where the failure to
         possess such licenses, permits, consents, orders, certificates or
         authorizations would have a material and adverse effect on the
         condition, financial or otherwise, or the earnings or business affairs
         of the Company and the Consolidated Subsidiaries considered as one
         enterprise, and neither the Company nor the Consolidated Subsidiaries
         have received any notice of proceedings relating to the revocation or
         modification of any such licenses, permits, consents, orders,
         certificates or authorizations which, singly or in the aggregate, if
         the subject of an unfavorable decision, ruling or finding, would have
         a material and adverse





                                      -8-
<PAGE>   10
         effect on the condition, financial or otherwise, or the earnings or
         business affairs of the Company and the Consolidated Subsidiaries
         considered as one enterprise.

                          (xx)    The Company and the Consolidated Subsidiaries
         own or possess, or can acquire on reasonable terms, the patents,
         patent rights, licenses, inventions, copyrights, know-how (including
         trade secrets and other unpatented and/or unpatentable proprietary or
         confidential information, systems or procedures), trademarks, service
         marks and trade names presently employed by them in connection with
         the business now operated by them, and neither the Company nor any of
         the Consolidated Subsidiaries has received any notice or is otherwise
         aware of any infringement of or conflict with asserted rights of
         others with respect to any of the foregoing which infringement or
         conflict (if the subject of any unfavorable decision, ruling or
         finding), singly or in the aggregate, would result in any material
         adverse change in the condition, financial or otherwise, or in the
         earnings, affairs or business prospects of the Company and the
         Consolidated Subsidiaries considered as one enterprise.

                          (xxi)   None of the Company, its directors or
         officers or any person who controls the Company within the meaning of
         Section 15 of the 1933 Act has taken, directly or indirectly, any
         action designed to cause or result in, or which has constituted,
         stabilization or manipulation of the price of any security of the
         Company in order to facilitate the sale or resale of the Securities
         and the associated Rights.

                          (xxii)  No holder of securities of the Company has
         any rights to require the registration of such securities under the
         1933 Act as a result of the filing of the Registration Statement or in
         connection with the offering of the Securities and the associated
         Rights.

                          (xxiii) Except as described in the Prospectus, there
         has been no storage, disposal, generation, manufacture, spill,
         discharge, refinement, transportation, handling or treatment of toxic
         wastes, medical wastes, hazardous wastes or hazardous substances by
         the Company or any of its Subsidiaries (or to the knowledge of the
         Company, any of its predecessors in interest) at, upon or from any of
         the property now or previously owned or leased or under contract for
         purchase by the Company or any of its Subsidiaries in violation of any
         applicable law, ordinance, rule, regulation, order, judgment, decree
         or permit or which would require remedial action under any applicable
         law, ordinance, rule, regulation, order, judgment, decree or permit,
         except for any violation or remedial action which would not result in,
         or which would not be reasonably likely to result in, singularly or in
         the aggregate with all such violations and remedial actions, a
         material and adverse effect on the condition, financial or otherwise,
         or the earnings, affairs or business prospects of the Company and the
         Consolidated Subsidiaries considered as one enterprise; and the terms
         "hazardous wastes," "toxic wastes," "hazardous substances" and
         "medical wastes" shall have the meanings specified in any applicable
         local, state, federal and foreign laws or regulations with respect to
         environmental protection.





                                      -9-
<PAGE>   11
                          (xxiv)  The information underlying the estimates of
         oil and gas reserves described in the Prospectus is complete and
         accurate in all material respects; other than normal production of the
         reserves and intervening spot market product price fluctuations
         described in the Prospectus, the Company is not aware of any facts or
         circumstances that would result in a material and adverse change in
         the reserves or the present value of future net cash flows therefrom
         as described in the Prospectus.  Estimates of such reserves and
         present values comply in all material respects to the applicable
         requirements of Regulation S-X and Industry Guide 2 under the 1933
         Act.

                 (b)      Any certificate signed by any officer of the Company
delivered to the Representatives or to counsel for the Underwriters after the
date hereof pursuant to the terms of this Agreement shall be deemed a
representation and warranty by the Company to each Underwriter as to the
matters covered thereby.

                 SECTION 2.  Sale and Delivery to Underwriters; Closing.

                 (a)      On the basis of the representations and warranties
herein contained and subject to the terms and conditions herein set forth, the
Company agrees to sell to each Underwriter, severally and not jointly, and each
Underwriter, severally and not jointly, agrees to purchase from the Company, at
the price per share set forth in the Pricing Agreement, the number of Initial
Securities set forth in Schedule A opposite the name of such Underwriter
(except as otherwise provided in the Pricing Agreement) plus any additional
number of Initial Securities that such Underwriter may become obligated to
purchase pursuant to the provisions of Section 10 hereof, subject, in each
case, to such adjustments as the Underwriters in their discretion shall make to
eliminate any sales or purchases of fractional securities.

                 In addition, on the basis of the representations and
warranties herein contained and subject to the terms and conditions herein set
forth, the Company hereby grants an option to the Underwriters, severally and
not jointly, to purchase from it up to an additional 1,020,000 shares of Common
Stock, at the purchase price per share set forth in the Pricing Agreement.  The
option hereby granted will expire on the 30th day after the date the
Registration Statement becomes effective or, if the Company has elected to rely
on Rule 430A of the 1933 Act Regulations, the 30th day after the Representation
Date, and may be exercised in whole or in part from time to time only for the
purpose of covering over-allotments which may be made in connection with the
offering and distribution of the Initial Securities upon notice by the
Representatives to the Company setting forth the number of Option Securities as
to which the Underwriters are then exercising the option and the time, date,
and place of payment and delivery for such Option Securities. Any such time and
date of delivery for the Option Securities (a "Date of Delivery") shall be
determined by the Representatives but shall be not earlier than two nor later
than seven full business days after the exercise of said option, nor in any
event prior to Closing Time (as hereinafter defined) unless otherwise agreed
upon by the Representatives and the Company.  If the option is exercised as to
all or any portion of the Option Securities, each of the Underwriters, acting
severally and not jointly, will purchase from the Company that proportion of
the number of Option Securities that the number of Initial





                                      -10-
<PAGE>   12
Securities set forth in Schedule A opposite the name of such Underwriter (plus
any additional number of Initial Securities which such Underwriter may become
obligated to purchase pursuant to the provisions of Section 10 hereof) bears to
the total number of Initial Securities (except as otherwise provided in the
Pricing Agreement), subject, in each case, to such adjustments as the
Underwriters in their discretion shall make to eliminate any sales or purchases
of fractional securities.

                          (i)     If the Company has elected not to rely upon
         Rule 430A of the 1933 Act Regulations, the initial public offering
         price of the Securities and the purchase price per share to be paid by
         the several Underwriters for the Securities have each been determined
         and set forth in the Pricing Agreement, dated the date hereof, and an
         amendment to the Registration Statement and the Prospectus will be
         filed before the Registration Statement becomes effective.

                          (ii)    If the Company has elected to rely upon Rule
         430A of the 1933 Act Regulations, the purchase price per share to be
         paid by the Underwriters for the Securities shall be an amount equal
         to the initial public offering price, less an amount per share to be
         determined by agreement between the Representatives and the Company.
         The initial public offering price per share of the Securities shall be
         a fixed price to be determined by agreement between the
         Representatives and the Company.  The initial public offering price
         per share and the purchase price, when so determined, shall be set
         forth in the Pricing Agreement.  In the event that such prices have
         not been agreed upon and the Pricing Agreement has not been executed
         and delivered by the parties thereto by the close of business on the
         fourth business day following the date of this Agreement, this
         Agreement shall terminate forthwith, without liability of any party to
         any other party, unless otherwise agreed to by the Company and the
         Representatives.

                 (b)      Payment of the purchase price for, and delivery of
certificates for, the Initial Securities to be purchased by the Underwriters
shall be made at the office of Baker & Botts, L.L.P., 885 Third Avenue, New
York, New York, or at such other place as shall be agreed upon by the
Representatives and the Company, at 10:00 A.M., New York City time, on the
third or fourth business day (as permitted under Rule 15c6-1 under the 1934 Act
unless postponed in accordance with the provisions of Section 10 hereof)
following the date of the execution of the Pricing Agreement or such other time
not later than ten business days after such date as shall be agreed upon by the
Representatives and the Company (such time and date of payment and delivery
being herein called "Closing Time").  In addition, in the event that any or all
of the Option Securities are purchased by the Underwriters, payment of the
purchase price for, and delivery of certificates for, such Option Securities
shall be made at the above-mentioned office of Baker & Botts, L.L.P., or at
such other place as shall be mutually agreed upon by the Representatives and
the Company, on each Date of Delivery as specified in the notice from the
Representatives to the Company.  Payment shall be made to the Company by
certified or official bank check or checks drawn in New York Clearing House
funds or similar next-day funds payable to the order of the Company against
delivery to the Representatives for the respective accounts of the Underwriters
of certificates for the Securities to be purchased by them.





                                      -11-
<PAGE>   13
Certificates for the Initial Securities and the Option Securities shall be in
such denominations and registered in such names as the Representatives may
request in writing at least two business days before Closing Time or the Date
of Delivery, as the case may be.  It is understood that each Underwriter has
authorized the Representatives, for its account, to accept delivery of, receipt
for, and make payment of the purchase price for, the Securities that it has
agreed to purchase.  The Representatives individually and not as
representatives of the Underwriters, may (but shall not be obligated to) make
payment of the purchase price for the Securities to be purchased by any
Underwriter whose check has not been received by Closing Time or the Date of
Delivery, as the case may be, but such payment shall not relieve such
Underwriter from its obligations hereunder. The certificates for the Initial
Securities and the Option Securities to be purchased by the Underwriters will
be made available in New York City for examination and packaging by the
Representatives not later than 10:00 A.M. on the last business day prior to
Closing Time or the Date of Delivery, as the case may be.

                 SECTION 3. Covenants of the Company.  The Company covenants
with each of the Underwriters as follows:

                 (a)      The Company will notify the Representatives
immediately, and confirm the notice in writing, (i) of the effectiveness of the
Registration Statement and any amendment thereto (including any post-effective
amendment), (ii) of the receipt of any comments from the Commission, (iii) of
any request by the Commission for any amendment to the Registration Statement
or any amendment or supplement to the Prospectus or for additional information,
and (iv) of the issuance by the Commission of any stop order suspending the
effectiveness of the Registration Statement or the initiation of any
proceedings for that purpose. The Company will make every reasonable effort to
prevent the issuance of any stop order and, if any stop order is issued, to
obtain the lifting thereof at the earliest possible moment.

                 (b)      The Company will give the Representatives notice of
its intention to file or prepare any amendment to the Registration Statement
(including any post-effective amendment) or any amendment or supplement to the
Prospectus (including any revised prospectus which the Company proposes for use
by the Underwriters in connection with the offering of the Securities which
differs from the prospectus on file at the Commission at the time the
Registration Statement becomes effective, whether or not such revised
prospectus is required to be filed pursuant to Rule 424(b) of the 1933 Act
Regulations, whether pursuant to the 1933 Act, the 1934 Act or otherwise), will
furnish the Representatives with copies of any such amendment or supplement a
reasonable amount of time prior to such proposed filing or use, as the case may
be, and will not file any such amendment or supplement to which the
Underwriters shall reasonably object.

                 (c)      The Company will deliver to the Representatives four
signed copies of the Registration Statement as originally filed and each
amendment thereto (including exhibits filed therewith or incorporated by
reference therein and documents incorporated or deemed to be incorporated by
reference therein) and will also deliver to the Representatives a conformed
copy





                                      -12-
<PAGE>   14
of the Registration Statement as originally filed and of each amendment thereto
(without exhibits) for each of the Representatives.

                 (d)      The Company will furnish to each Underwriter, from
time to time during the period when the Prospectus is required to be delivered
under the 1933 Act or 1934 Act, such number of copies of the Prospectus (as
amended or supplemented) as such Underwriter may reasonably request for the
purposes contemplated by the 1933 Act, the 1933 Act Regulations, the 1934 Act
or the 1934 Act Regulations.

                 (e)      If any event shall occur as a result of which it is
necessary, in the reasonable opinion of the Underwriters, to amend or
supplement the Prospectus in order to make the Prospectus not misleading in the
light of the circumstances existing at the time it is delivered to a purchaser,
the Company will forthwith amend or supplement the Prospectus (in form and
substance satisfactory to the Underwriters) and furnish to the Underwriters a
reasonable number of copies of any amendment or amendments of or supplement or
supplements to, the Prospectus, so that, as so amended or supplemented, the
Prospectus will not contain an untrue statement of a material fact or omit to
state a material fact necessary in order to make the statements therein, in the
light of the circumstances existing at the time the Prospectus is delivered to
a purchaser, not misleading.

                 (f)      The Company, during the period when the Prospectus is
required to be delivered under the 1933 Act, will file promptly all documents
required to be filed with the Commission pursuant to Section 13, 14 or 15 of
the 1934 Act subsequent to the time the Registration Statement becomes
effective.

                 (g)      The Company will endeavor, in cooperation with the
Underwriters, to qualify the Securities and the associated Rights for offering
and sale under the applicable securities laws of such states and other
jurisdictions of the United States as the Representatives may designate;
provided, however, that the Company shall not be obligated to qualify as a
foreign corporation in any jurisdiction in which it is not so qualified.  In
each jurisdiction in which the Securities and the shares of Common Stock and
associated Rights issuable upon the conversion thereof have been qualified as
above provided, the Company will file such statements and reports as may be
required by the laws of such jurisdiction in effect for a period of not less
than one year from the effective date of the Registration Statement.

                 (h)      The Company will make generally available to its
security holders as soon as practicable, but not later than 90 days after the
close of the period covered thereby, an earnings statement (in form complying
with the provisions of Rule 158 of the 1933 Act Regulations) covering a
12-month period beginning not later than the first day of the Company's fiscal
quarter next following the "effective date" (as defined in said Rule 158) of
the Registration Statement.

                 (i)      The Company will use the net proceeds received by it
from the sale of the Securities in the manner specified in the Prospectus under
"Use of Proceeds."





                                      -13-
<PAGE>   15
                 (j)      If, at the time that the Registration Statement
becomes effective, any information shall have been omitted therefrom in
reliance upon Rule 430A of the 1933 Act Regulations, then immediately following
the execution of the Pricing Agreement, the Company will prepare, and file or
transmit for filing with the Commission in accordance with such Rule 430A and
Rule 424(b) of the 1933 Act Regulations, copies of an amended Prospectus, or,
if required by such Rule 430A, a post-effective amendment to the Registration
Statement (including an amended Prospectus), containing all information so
omitted.

                 (k)      The Company will file with the New York Stock
Exchange and the Chicago Stock Exchange all documents and notices required by
the New York Stock Exchange of companies that have securities listed on such
exchange and will use every reasonable effort to maintain the listing of the
Securities on the New York Stock Exchange and the Chicago Stock Exchange.

                 (l)      During a period of 90 days from the date of the
Pricing Agreement, the Company will not, without the prior written consent of
the Representatives, directly or indirectly, sell, offer to sell, grant any
option for the sale of, or otherwise dispose of, any Common Stock and
associated Rights or any security convertible into or exercisable or
exchangeable for Common Stock (i) in a public offering or (ii) in a private
offering unless such private offering shall occur more than 30 days after the
date of this Agreement and the recipient of such Common Stock shall agree not
to sell, offer to sell, grant any option for the sale of, or otherwise dispose
of, such Common Stock for the remaining portion of the 90-day period from the
date of this Agreement (except for (i) Common Stock and associated Rights
pursuant to reservations, agreements, employee benefit plans, the exercise of
rights or the conversion of convertible securities referred to in the
Prospectus and (ii) Common Stock and associated Rights issued pursuant to the
Company's Registration Statement on Form S-4 (Reg. No. 33-61669) (the
"Acquisition Shelf") in connection with acquisitions of properties or
businesses by the Company following the date hereof, provided that, the Company
will not issue any shares pursuant to the Acquisition Shelf during the period
from the date hereof until ___ days following the Closing Time and will not
issue more than 600,000 shares pursuant to the Acquisition Shelf during the
period of ___ days from the date of the Pricing Agreement).

                 SECTION 4.  Payment of Expenses.  The Company will pay all
expenses incident to the performance of its obligations under this Agreement,
including (i) the printing and filing of the Registration Statement as
originally filed and of each amendment thereto, (ii) the preparation, issuance
and delivery of the Securities to the Underwriters, (iii) the fees and
disbursements of the Company's counsel, accountants and petroleum engineers,
(iv) the expenses in connection with the qualification of the Securities under
state securities laws in accordance with the provisions of Section 3(g) hereof,
including filing fees and the fees and disbursements of counsel for the
Underwriters in connection therewith and in connection with the preparation of
the Blue Sky Survey, (v) the printing and delivery to the Underwriters of
copies of the Registration Statement as originally filed and of each amendment
thereto, of each of the preliminary prospectuses, and of the Prospectus and any
amendments or supplements thereto, (vi) the delivery to the Underwriters of
copies of Blue Sky Survey, (vii) the fees and expenses





                                      -14-
<PAGE>   16
incurred in connection with any filings required to be made by the Underwriters
with the National Association of Securities Dealers, Inc., and (viii) the fees
and expenses incurred in connection with the listing of the Securities on the
New York Stock Exchange and the Chicago Stock Exchange.

                 If this Agreement is terminated by the Representatives in
accordance with the provisions of Section 5 hereof or Section 9(a)(i) hereof,
the Company shall reimburse the Underwriters for all of their out-of-pocket
expenses, including the reasonable fees and disbursements of counsel for the
Underwriters.  The terms of this paragraph shall survive any such termination
of this Agreement.

                 SECTION 5.  Conditions of Obligations of the Underwriters.
The obligations of the Underwriters hereunder are subject to the accuracy of
the representations and warranties of the Company herein contained at the date
hereof and at Closing Time, to the performance by the Company of its
obligations hereunder required to be performed prior to Closing Time, and to
the following further conditions:

                 (a)      The Registration Statement shall have become
effective not later than 5:30 P.M. on the date hereof or at such later time and
date as may be approved by the Representatives; and at Closing Time and any
Date of Delivery, as the case may be, no stop order suspending the
effectiveness of the Registration Statement shall have been issued under the
1933 Act or proceedings therefor initiated or threatened by the Commission. If
the Company has elected to rely upon Rule 430A of the 1933 Act Regulations, the
initial public offering price per share of the Securities, the purchase price
per share to be paid by the Underwriters, and any other price-related
information previously omitted from the effective Registration Statement
pursuant to such Rule 430A shall have been transmitted to the Commission for
filing pursuant to Rule 424(b) of the 1933 Act Regulations within the
prescribed time period, and prior to Closing Time the Company shall have
provided evidence satisfactory to the Representatives of such timely filing, or
a post-effective amendment providing such information shall have been promptly
filed and declared effective in accordance with the requirements of Rule 430A
of the 1933 Act Regulations.

                 (b)      At Closing Time the Representatives shall have
received:

                 (1)      The favorable opinion, dated as of Closing Time, of
         Andrews & Kurth L.L.P., counsel for the Company, in form and substance
         reasonably satisfactory to the Underwriters, to the effect that:

                          (i)     The Company has been duly incorporated and is
                 an existing corporation in good standing under the laws of the
                 State of Delaware.

                          (ii)    This Agreement and the Pricing Agreement have
                 each been duly authorized, executed and delivered by the
                 Company.





                                      -15-
<PAGE>   17
                          (iii)   The Securities to be purchased by the
                 Underwriters from the Company at the Closing Time have been
                 duly authorized for issuance and sale to the Underwriters
                 pursuant to this Agreement and, when issued and delivered by
                 the Company pursuant to this Agreement against payment of the
                 consideration set forth in the Pricing Agreement, such
                 Securities will be validly issued and fully paid and
                 nonassessable.

                          (iv)    The issuance of the Securities by the Company
                 is not subject to preemptive or other similar rights arising
                 by operation of law or under the charter or by-laws of the
                 Company or, to the best of their knowledge, otherwise.

                          (v)     The Registration Statement has become
                 effective under the 1933 Act and, to the best knowledge of
                 such counsel, no stop order suspending the effectiveness of
                 the Registration Statement has been issued under the 1933 Act
                 and no proceeding for that purpose has been instituted or
                 threatened by the Commission.

                          (vi)    The Registration Statement, as of its
                 effective date, and the Prospectus, as of its date, and any
                 supplements or amendments thereto (other than the financial
                 statements and engineering reports and other financial and
                 engineering data included therein, as to which no opinion need
                 be rendered) appeared on their face to be appropriately
                 responsive to the requirements of the 1933 Act and the 1933
                 Act Regulations.

                          (vii)   The Common Stock conforms to the description
                 thereof contained in the Prospectus, and the form of
                 certificate used to evidence the Common Stock is in due and
                 proper form and complies with all applicable statutory
                 requirements.

                 In rendering the foregoing opinion or opinions, Andrews &
         Kurth, L.L.P. may state that such opinion or opinions are limited to
         the Federal laws of the United States, the laws of the States of New
         York and Texas and the General Corporation Law of the State of
         Delaware, and that they are expressing no opinion as to the effect of
         the laws of any other jurisdiction.  In addition, such counsel may
         state that they have relied as to certain matters on information
         obtained from public officials, officers of the Company and other
         sources believed by them to be responsible.

                 (2)      The favorable opinion, dated as of Closing Time, of
         Zurab S. Kobiashvili, General Counsel of the Company, in form and
         substance satisfactory to counsel for the Underwriters with respect to
         the matters set forth in (ii) to (v) and (vii) of subsection (b)(1) of
         this Section, and to the further effect that:

                          (i)     To the best knowledge and information of such
                 counsel, the Company is duly qualified as a foreign
                 corporation to transact business and is in good standing in
                 each jurisdiction in which such qualification is required,
                 except





                                      -16-
<PAGE>   18

                 where failure to so qualify would not have a material adverse
                 effect on the condition, financial or otherwise, or the        
                 earnings, affairs or business prospects of the Company and the
                 Consolidated Subsidiaries considered as one enterprise.

                          (ii)    The Company has the corporate power and
                 authority to own, lease and operate its properties and conduct
                 its business as described in the Prospectus.

                          (iii)   The authorized, issued and outstanding
                 capital stock of the Company is as set forth in the Prospectus
                 under "Capitalization" (except for issuances, if any,
                 subsequent to the date of the Prospectus pursuant to
                 reservations, agreements, employee benefit plans, the exercise
                 of rights or the conversion of convertible securities referred
                 to in the Prospectus) and the shares of issued and outstanding
                 Common Stock have been duly authorized and validly issued and
                 are fully paid and nonassessable.

                          (iv)    Each Corporate Subsidiary has been duly
                 incorporated and is validly existing as a corporation in good
                 standing under the laws of the jurisdiction of its
                 incorporation, and, to the best knowledge and information of
                 such counsel, is duly qualified as a foreign corporation to
                 transact business and is in good standing in each jurisdiction
                 in which such qualification is required, except where failure
                 to so qualify would not have a material adverse effect on the
                 condition, financial or otherwise, or the earnings or business
                 affairs of the Company and the Consolidated Subsidiaries
                 considered as one enterprise; and all of the issued and
                 outstanding capital stock of each Corporate Subsidiary has
                 been duly and validly issued, is fully paid and nonassessable
                 and is, to the best knowledge and information of such counsel,
                 owned by the Company, directly or indirectly, free and clear
                 of any pledge, lien, encumbrance, claim or equity (except as
                 described in the Prospectus).

                          [(v)    Each Partnership Subsidiary has been duly
                 formed and is validly existing as a partnership in good
                 standing under the laws of the jurisdiction of its formation
                 and, to the best knowledge and information of such counsel, is
                 duly qualified as a foreign partnership to transact business
                 and is in good standing in all jurisdictions in which such
                 qualification is required, except where failure to so qualify
                 would not have a material adverse effect on the condition,
                 financial or otherwise, or the earnings or business affairs of
                 the Company and the Consolidated Subsidiaries considered as
                 one enterprise; and all the outstanding partnership interests
                 in each Partnership Subsidiary have been duly authorized and
                 validly issued, are fully paid and nonassessable and are, to
                 the best knowledge and information of such counsel, owned by
                 the Company, directly or indirectly, free and clear of any
                 pledge, lien, encumbrance, claim or equity (except as
                 described in the Prospectus).]





                                      -17-
<PAGE>   19
                          (vi)    No authorization, approval, consent or order
                 of any court or governmental authority or agency is required
                 for the consummation of the transactions contemplated by this
                 Agreement in connection with the sale by the Company of the
                 Securities to the Underwriters hereunder, except such as may
                 be required under the 1933 Act, the 1933 Act Regulations, the
                 1934 Act or the 1934 Act Regulations, and state securities
                 laws for the offering and sale of the Securities; and the
                 execution and delivery of this Agreement and the Pricing
                 Agreement and the consummation of the transactions herein and
                 therein contemplated will not conflict with or constitute a
                 breach or violation of, or default under, the provisions of
                 the charter or by-laws of the Company, or of any applicable
                 law, administrative regulation or, to the best knowledge and
                 information of such counsel, any administrative or court
                 decree.

                          (vii)   To the best knowledge and information of such
                 counsel, the execution and delivery of this Agreement and the
                 Pricing Agreement and the consummation of the transactions
                 herein and therein contemplated will not conflict with or
                 constitute a breach or violation of, or a default under, or
                 result in the creation or imposition of any lien, charge or
                 encumbrance upon, any property or assets of the Company or any
                 of its Subsidiaries pursuant to, any material contract,
                 indenture, mortgage, loan agreement, note, lease or other
                 instrument or agreement to which the Company or any of its
                 Subsidiaries is a party or by which it or any of them may be
                 bound, or to which any of the property or assets of the
                 Company or any of its Subsidiaries is subject.

                          (viii)  To the best knowledge and information of such
                 counsel, there are no contracts, indentures, mortgages, loan
                 agreements, notes, leases or other instruments required to be
                 described or referred to in the Registration Statement or to
                 be filed or incorporated by reference as exhibits thereto
                 other than those described or referred to in the Registration
                 Statement or filed as exhibits thereto; and the descriptions
                 thereof or references thereto are correct, and no default
                 exists in the due performance or observance of any material
                 obligation, agreement, covenant or condition contained in any
                 contract, indenture, loan agreement, note, lease or other
                 instrument so described, referred to, filed, or incorporated
                 by reference where the consequences of such default would have
                 a material adverse effect on the condition, financial or
                 otherwise, or the earnings, affairs or business prospects of
                 the Company and the Consolidated Subsidiaries considered as
                 one enterprise.

                          (ix)    There are no legal or governmental
                 proceedings pending or threatened to which such counsel has
                 given substantive attention, or in which such counsel has been
                 engaged to represent the Company or its Subsidiaries, that are
                 required to be disclosed in the Prospectus, other than those
                 disclosed therein.

                          (x)     The Company is not in violation of its 
                 charter or by-laws.





                                      -18-
<PAGE>   20
                          (xi)    To the best knowledge and information of such
                 counsel, no holder of securities of the Company has rights to
                 the registration under the 1933 Act of securities of the
                 Company because of the filing of the Registration Statement
                 that have not been satisfied or waived.

                          (xii)   Each document filed pursuant to the 1934 Act
                 and incorporated or deemed to be incorporated by referenced in
                 the Prospectus (other than financial statements, supporting
                 schedules and other financial or statistical information as to
                 which no opinion need be rendered) appeared on their face to
                 be appropriately responsive when so filed to the requirements
                 of the 1934 Act and the 1934 Act Regulations.

                 In rendering the foregoing opinion or opinions, Mr.
         Kobiashvili may state that such opinion or opinions are limited to the
         Federal laws of the United States and the General Corporation Law of
         the State of Delaware, and that he is expressing no opinion as to the
         effect of the laws of any other jurisdiction.  In addition, Mr.
         Kobiashvili may state that he has relied as to certain matters on
         information obtained from public officials, officers of the Company
         and other sources believed by him to be responsible.

                 (3)      The favorable opinion, dated as of Closing Time, of
         Baker & Botts, L.L.P., counsel for the Underwriters, with respect to
         the matters set forth in (i), (ii), (iii), (iv) (solely as to
         preemptive rights arising by operation of law or under the charter or
         by-laws of the Company), (v) and (vi) of subsection (b)(1) of this
         Section.

                 (4)      The written advice of Andrews & Kurth, L.L.P. and
         Zurab S. Kobiashvili to the effect that nothing has come to their
         attention that causes them to believe that the Registration Statement,
         at the time it became effective, contained an untrue statement of a
         material fact or omitted to state a material fact required to be
         stated therein or necessary to make the statements therein not
         misleading or that the Prospectus, at the date of the Prospectus
         (unless the term "Prospectus" refers to a prospectus which has been
         provided to the Underwriters by the Company for use in connection with
         the offering of the Securities and the associated Rights which differs
         from the Prospectus on file at the Commission at the date of the
         Prospectus, in which case at the time it is first provided to the
         Underwriters for such use) or at Closing Time, contained an untrue
         statement of a material fact or omitted to state a material fact
         necessary in order to make the statements therein, in the light of the
         circumstances under which they were made, not misleading; it being
         understood that such counsel need express no opinion as to the
         financial statements and engineering reports and other financial or
         engineering data contained in the Registration Statement or the
         Prospectus.

                 (c)      At Closing Time there shall not have been, since the
date hereof or since the respective dates as of which information is given in
the Prospectus, any material adverse change in the condition, financial or
otherwise, or the earnings, affairs or business prospects of the Company or the
Consolidated Subsidiaries considered as one enterprise, whether or not in





                                      -19-
<PAGE>   21
the ordinary course of business, and the Representatives shall have received a
certificate of the Chairman of the Board, the President or any Senior Vice
President of the Company and of the chief financial or chief accounting officer
of the Company, dated as of Closing Time, to the effect that (i) there has been
no such material adverse change, (ii) the representations and warranties of the
Company contained in Section 1(a) of this Agreement are true and correct with
the same force and effect as though expressly made at and as of Closing Time,
(iii) the Company has complied with all agreements and satisfied all conditions
on its part to be performed or satisfied at or prior to Closing Time, and (iv)
no stop order suspending the effectiveness of the Registration Statement has
been issued and no proceedings for that purpose have been initiated or
threatened by the Commission.  As used in this Section 5(c), the term
"Prospectus" means the Prospectus in the form first used to confirm sales of
the Securities.

                 (d)      At the time of the execution of this Agreement, the
Representatives shall have received from Arthur Andersen LLP a letter dated
such date, in form and substance satisfactory to the Underwriters, to the
effect that (i) they are independent public accountants with respect to the
Company and its subsidiaries within the meaning of the 1933 Act and the 1933
Act Regulations; (ii) it is their opinion that the financial statements and
supporting schedules included in the Registration Statement and covered by
their opinions therein comply as to form in all material respects with the
applicable accounting requirements of the 1933 Act and the 1933 Act
Regulations; (iii) based upon their review of interim financial information of
the Company and the Consolidated Subsidiaries as described in Statement on
Auditing Standards No. 71 and inquiries of certain officials of the Company and
the other procedures set forth in detail in such letter, nothing has come to
their attention that causes them to believe that (A) the unaudited and other
financial information of the Company and its subsidiaries included in the
Registration Statement or incorporated by reference therein does not comply as
to form in all material respects with the applicable accounting requirements of
the 1933 Act and the 1933 Act Regulations or is not presented in conformity
with generally accepted accounting principles applied on a basis substantially
consistent with that of the audited financial statements included in the
Registration Statement or incorporated by reference therein, or (B) at a
specified date not more than five days prior to the date of this Agreement and
not earlier than the effective date of the Registration Statement, there has
been any change in the capital stock of the Company or any increase in the
consolidated long term debt of the Company and the Consolidated Subsidiaries or
any decrease in consolidated net current assets or net assets as compared with
the amounts shown in the June 30, 1995 balance sheet included in the
Registration Statement or, during the period from June 30, 1995 to a specified
date not more than five days prior to the date of this Agreement, there were
any decreases, as compared with the corresponding period in the preceding year,
in consolidated revenues, net income or net income per share of the Company and
its subsidiaries, except in all instances for changes, increases or decreases
which the Registration Statement and the Prospectus disclose have occurred or
may occur and for changes, increases or decreases set forth in such letter, in
which case the letter shall be accompanied by an explanation by the Company as
to the significance thereof unless said explanation is not deemed necessary by
the Representatives; (iv) on the basis of a reading of the unaudited pro forma
financial information of the Company and its subsidiaries, inquiries of
officials of the Company who have responsibility for financial and accounting
matters and





                                      -20-
<PAGE>   22
proving the arithmetic accuracy of the application of the pro forma adjustments
to the historical amounts in such unaudited pro forma combined financial
information, nothing has come to their attention which caused them to believe
that such unaudited pro forma combined financial information does not comply as
to form in all material respects with the applicable accounting requirements of
Rule 11-02 of Regulation S-X or that the pro forma adjustments have not been
properly applied to the historical amounts in such statements; and (v) in
addition to the examination referred to in their opinions and the limited
procedures referred to in clause (iii) above, they have carried out certain
specified procedures, not constituting an audit, with respect to certain
amounts, percentages and financial information which are included in the
Registration Statement and Prospectus and which are specified by the
Representatives, and have found such amounts, percentages and financial
information to be in agreement with the relevant accounting, financial and
other records of the Company and its subsidiaries identified in such letter.

                 (e)      At Closing Time the Representatives shall have
received from Arthur Andersen LLP a letter, dated as of Closing Time to the
effect that they confirm the statements made in the letter furnished pursuant
to subsection (d) of this Section, except that the specified date referred to
in such letter shall be a date not more than five days prior to Closing Time
and not earlier than the date of the Propsectus first used to confirm sales of
the Securities.

                 (f)      At Closing Time counsel for the Underwriters shall
have been furnished with such documents and opinions as they may require for
the purpose of enabling them to pass upon the issuance and sale of the
Securities as herein contemplated and related proceedings, or in order to
evidence the accuracy of any of the representations or warranties, or the
fulfillment of any of the conditions, herein contained; and all proceedings
taken by the Company in connection with the issuance and sale of the Securities
as herein contemplated shall be satisfactory in form and substance to the
Underwriters.

                 (g)      At Closing Time all actions, proceedings,
instruments, opinions and documents required in connection with the
consummation of the transactions contemplated by this Agreement shall be
reasonably satisfactory to the Representatives, and the Company shall have
delivered to the Representatives such other certificates and documents as the
Representatives shall reasonably request.

                 (h)      The New York Stock Exchange shall have approved the
Securities for listing, subject to notice of issuance.

                 (i)      In the event the Underwriters exercise their option
provided in Section 2 hereof to purchase all or any part of the Option
Securities, and the Date of Delivery specified by the Underwriters for any such
purchase is a date other than Closing Time, the obligation of the Underwriters
to purchase all or any such portion of the Option Securities shall be subject,
in addition to the foregoing conditions, to the accuracy of the representations
and warranties of the Company at each Date of Delivery, to the performance by
the Company of its obligations hereunder required to be performed prior to each
Date of Delivery, and to the receipt by the Underwriters of the following:





                                      -21-
<PAGE>   23
                 (1)      A certificate, dated such Date of Delivery, of the
         Chairman of the Board, the President or any Senior Vice President of
         the Company and of the chief financial or chief accounting officer of
         the Company confirming that the certificate delivered at Closing Time
         pursuant to Section 5(c) hereof remains true as of such Date of
         Delivery.

                 (2)      The favorable opinion of Andrews & Kurth, L.L.P.,
         counsel for the Company, in form and substance satisfactory to counsel
         for the Underwriters, dated such Date of Delivery relating to the
         Option Securities and otherwise to the same effect as the opinion
         required by Section 5(b)(1) hereof.

                 (3)      The favorable opinion of Zurab S. Kobiashvili,
         General Counsel of the Company, in form and substance satisfactory to
         counsel for the Underwriters, dated such Date of Delivery, relating to
         the Option Securities and otherwise to the same effect as the opinion
         required by Section 5(b)(2) hereof.

                 (4)      The written advice of Andrews & Kurth, L.L.P. and
         Zurab S. Kobiashvili to the same effect required by Section 5(b)(4)
         hereof.

                 (5)      The favorable opinion of Baker & Botts, L.L.P.,
         counsel for the Underwriters, dated such Date of Delivery, relating to
         the Option Securities and otherwise to the same effect as the opinion
         required by Section 5(b)(3) hereof.

                 (6)      A letter, dated as of such Date of Delivery, from
         Arthur Andersen LLP, in form and substance satisfactory to the
         Underwriters, substantially the same in scope and substance as the
         letter furnished pursuant to Section 5(d), except that the "specified
         date" in such letter shall be a date not more than four days prior to
         such Date of Delivery.

                 If any condition specified in this Section shall not have been
fulfilled when and as required to be fulfilled, this Agreement may be
terminated by the Representatives by notice to the Company at any time at or
prior to Closing Time and such termination shall be without liability of any
party to any other party except as provided in Section 4 hereof.

                 SECTION 6. Indemnification.

                 (a)      The Company agrees to indemnify and hold harmless
each Underwriter and each person, if any, who controls any Underwriter within
the meaning of Section 15 of the 1933 Act as follows:

                          (i)     against any and all loss, liability, claim,
         damage and expense whatsoever, as incurred, arising out of any untrue
         statement or alleged untrue statement of a material fact contained in
         the Registration Statement (or any amendment thereto), including
         information deemed to be part of the Registration Statement pursuant
         to Rule 430A(b) of the 1933 Act Regulations, if applicable, or the
         omission or alleged omission





                                      -22-
<PAGE>   24
         therefrom of a material fact required to be stated therein or
         necessary to make the statements therein not misleading or arising out
         of any untrue statement or alleged untrue statement of a material fact
         contained in any preliminary prospectus or the Prospectus (or any
         amendment or supplement thereto) or the omission or alleged omission
         therefrom of a material fact necessary in order to make the statements
         therein, in the light of the circumstances under which they were made,
         not misleading, unless such untrue statement or omission or such
         alleged untrue statement or omission was made in reliance upon and in
         conformity with written information furnished to the Company by an
         Underwriter through the Representatives expressly for use in the
         Registration Statement (or any amendment thereto) or such preliminary
         prospectus or the Prospectus (or any amendment or supplement thereto);
         provided, however, that with respect to any untrue statement or
         omission or alleged untrue statement or omission made in any
         preliminary prospectus or the Prospectus the indemnity agreement
         contained in this Section (a) shall not inure to the benefit of any
         Underwriter from whom the person asserting any such loss, liability,
         claim, damage or expense purchased the Securities concerned, to the
         extent that any such loss, liability, claim, damage or expense of such
         Underwriter results from the fact that there was not sent or given to
         such person, at or prior to the written confirmation of the sale of
         such Securities to such person, a copy of the Prospectus (exclusive of
         material incorporated by reference) if the Company had previously
         furnished copies thereof to such Underwriter;

                          (ii)    against any and all loss, liability, claim,
         damage and expense whatsoever, as incurred, to the extent of the
         aggregate amount paid in settlement of any litigation, or any
         investigation or proceeding by any governmental agency or body,
         commenced or threatened, or of any claim whatsoever based upon any
         such untrue statement or omission, or any such alleged untrue
         statement or commission, if such settlement is effected with the
         written consent of the Company; and

                          (iii)   against any and all expense whatsoever, as
         incurred (including the fees and expenses of counsel chosen by the
         Representatives), reasonably incurred in investigating, preparing or
         defending against any litigation, or any investigation or proceeding
         by any governmental agency or body, commenced or threatened, or any
         claim whatsoever based upon any such untrue statement or omission, or
         any such alleged untrue statement or omission, to the extent that (x)
         the Company is required to do so under Section 6(c) below and (y) any
         such expense is not paid under (i) or (ii) above.

                 (b)      Each Underwriter agrees, severally and not jointly,
to indemnify and hold harmless the Company, its directors, each of its officers
who signed the Registration Statement and each person, if any, who controls the
Company within the meaning of Section 15 of the 1933 Act against any and all
loss, liability, claim, damage and expense described in the indemnity contained
in subsection (a) of this Section, but only with respect to untrue statements
or omissions, or alleged untrue statements or omissions, made in the
Registration Statement (or any amendment thereto) or any preliminary prospectus
or the Prospectus (or any amendment or supplement thereto) in reliance upon and
in conformity with written information furnished to the





                                      -23-
<PAGE>   25
Company by such Underwriter expressly for use in the Registration Statement (or
any amendment thereto) or such preliminary prospectus or the Prospectus (or any
amendment or supplement thereto).

                 (c)      Each indemnified party shall give notice as promptly
as reasonably practicable to each indemnifying party of any action commenced
against it in respect of which indemnity may be sought hereunder but failure to
so notify any indemnifying party shall not relieve it from any liability which
it may have otherwise than on account of this indemnity agreement.  An
indemnifying party may participate at its own expense in the defense of such
action.  If it so elects within a reasonable time after receipt of such notice,
an indemnifying party, jointly with any other indemnifying parties receiving
such notice, may assume the defense of such action with counsel chosen by it
and approved by the indemnified parties defendant in such action, except to the
extent such indemnified parties retain separate counsel (the "Separate
Counsel") with respect to legal defenses available to them that are different
from or in addition to those available to such indemnifying party and such
defenses are in conflict with the interests of the indemnifying parties.  If an
indemnifying party assumes the defense of such action, the indemnifying parties
shall not be liable for any fees and expenses of counsel for the indemnified
parties incurred thereafter in connection with such action.  In no event shall
the indemnifying parties be liable for the reasonable fees and expenses of more
than the Separate Counsel (in addition to any local counsel) separate from
their own counsel for all indemnified parties in connection with any one action
or separate but similar or related actions in the same jurisdiction arising out
of the same general allegations or circumstances.

                 SECTION 7.       Contribution.  In order to provide for just
and equitable contribution in circumstances in which the indemnity agreement
provided for in Section 6 hereof is for any reason held to be unenforceable by
the indemnified parties although applicable in accordance with its terms, the
Company and the Underwriters shall contribute to the aggregate losses,
liabilities, claims, damages and expenses of the nature contemplated by said
indemnity agreement incurred by the Company and one or more of the Underwriters
in such proportions that the Underwriters are responsible for that portion
represented by the percentage that the underwriting discount appearing on the
cover page of the Prospectus bears to the initial public offering price
appearing thereon and the Company is responsible for the balance; provided,
however, that no person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution
from any person who was not guilty of such fraudulent misrepresentation.  For
purposes of this Section, each person, if any, who controls an Underwriter
within the meaning of Section 15 of the 1933 Act shall have the same rights to
contribution as such Underwriter, and each director of the Company, each
officer of the Company who signed the Registration Statement, and each person,
if any, who controls the Company within the meaning of Section 15 of the 1933
Act shall have the same rights to contribution as the Company.

                 SECTION 8.       Representations, Warranties and Agreements to
Survive Delivery.   All representations, warranties and agreements contained in
this Agreement and the Pricing Agreement, or contained in certificates of
officers of the Company submitted pursuant hereto,





                                      -24-
<PAGE>   26
shall remain operative and in full force and effect, regardless of any
investigation made by or on behalf of any Underwriter or controlling person, or
by or on behalf of the Company, and shall survive delivery of the Securities to
the Underwriters.

                 SECTION 9.       Termination of Agreement.

                 (a)      The Representatives may terminate this Agreement, by
notice to the Company, at any time at or prior to Closing Time (i) if there has
been, since the date of this Agreement or since the respective dates as of
which information is given in the Prospectus, any material adverse change in
the condition, financial or otherwise, or the earnings, business affairs or
business prospects of the Company and the Consolidated Subsidiaries considered
as one enterprise, whether or not arising in the ordinary course of business,
or (ii) if there has occurred any material adverse change in the financial
markets of the United States or any outbreak or escalation of hostilities or
other calamity or crisis the effect of which is such as to make it, in the
judgment of the Representatives, impracticable to market the Securities or
enforce contracts for the sale of the Securities, or (iii) if trading in the
Common Stock has been suspended by the Commission, or if trading generally on
either the New York Stock Exchange or the American Stock Exchange has been
suspended, or minimum or maximum prices for trading have been fixed, or maximum
ranges for prices for securities have been required, by either of said
exchanges or by order of the Commission or any other governmental authority, or
if a banking moratorium has been declared by either federal or New York
authorities.  As used in this Section 9(a), the term "Prospectus" means the
Prospectus in the form first used to confirm sales of the Securities.

                 (b)      If this Agreement is terminated pursuant to this
Section, such termination shall be without liability of any party except as
provided in Section 4 hereof.  Notwithstanding any such termination, the
provisions of Sections 6 and 7 shall remain in effect.

                 SECTION 10. Default by an Underwriter.  If any one of the
Underwriters shall fail to purchase and pay for any of the Initial Securities
agreed to be purchased by such Underwriter under this Agreement and the
Pricing Agreement and such failure to purchase shall constitute a default in
the performance of its obligations hereunder and thereunder, the remaining
Underwriters shall have the right, within 24 hours thereafter, to make
arrangements for one or more of the non-defaulting Underwriters or any other
underwriters to purchase all, but not less than all, of Initial Securities not
so purchased in such amounts as may be agreed upon and upon the terms herein
set forth; if, however, the Underwriters shall not have completed such
arrangements within said 24-hour period, then:

                 (1)      if the number of Initial Securities not so purchased
         does not exceed 10% of the Initial Securities, the non-defaulting
         Underwriters shall be obligated to purchase the full amount thereof in
         the proportions that their respective underwriting obligations
         hereunder bear to the underwriting obligations of all non-defaulting
         Underwriters, or





                                      -25-
<PAGE>   27
                 (2)      if the number of Initial Securities not so purchased
         exceeds 10% of the Initial Securities, this Agreement shall terminate
         without liability on the part of any non-defaulting Underwriter.

         No action taken pursuant to this Section shall relieve any defaulting
Underwriter from any liability it may have hereunder in respect of its default.

         In the event of any such default that does not result in a termination
of this Agreement, each of the Representatives shall have the right to postpone
Closing Time for such period, not exceeding seven days, as they shall determine
in order that the required changes in Registration Statement and the Prospectus
or in any other documents or arrangements may be effected.

                 SECTION 11.  Notices. All notices and other communications
hereunder shall be in writing and shall be deemed to have been duly given if
mailed or transmitted by any standard form of telecommunication.  Notices to
the Underwriters shall be directed to the Representatives c/o Merrill Lynch &
Co./Merrill Lynch, Pierce, Fenner & Smith Incorporated at World Financial
Center, North Tower, 250 Vesey Street, New York, New York 10281, to the
attention of Rodman D. Patton, Managing Director; and notices to the Company
shall be directed to it at One Post Oak Central, 2000 Post Oak Boulevard, Suite
100, Houston, Texas  77056, to the attention of Zurab S. Kobiashvili, Vice
President and General Counsel.

                 SECTION 12.  Parties. This Agreement and the Pricing Agreement
shall each inure to the benefit of and be binding upon the Underwriters and the
Company and their respective successors.  Nothing expressed or mentioned in
this Agreement or the Pricing Agreement is intended or shall be construed to
give any person, firm or corporation, other than the Underwriters and the
Company and their respective successors and the controlling persons and
officers and directors referred to in Sections 6 and 7 hereof and their heirs
and legal representatives, any legal or equitable right, remedy or claim under
or in respect of this Agreement or the Pricing Agreement or any provision
herein or therein contained.  This Agreement and the Pricing Agreement and all
conditions and provisions hereof and thereof are intended to be for the sole
and exclusive benefit of the Underwriters and the Company and their respective
successors, and said controlling persons and officers and directors and their
heirs and legal representatives, and for the benefit of no other person, firm
or corporation. No purchaser of Securities from any Underwriter shall be deemed
to be a successor by reason merely of such purchase.

                 SECTION 13.  Governing Law and Time.  This Agreement and the
Pricing Agreement shall be governed by the laws of the State of New York
applicable to agreements made and to be performed in said state.  Except where
otherwise provided, specified times of day refer to New York City time.





                                      -26-
<PAGE>   28
                 If the foregoing is in accordance with your understanding of
our agreement, please sign and return to us a counterpart hereof, whereupon
this instrument along with all counterparts will become a binding agreement
between the Company and each of the Underwriters in accordance with its terms.

                                        Very truly yours,
 
                                        APACHE CORPORATION



                                        By:__________________________________
                                        Name:
                                        Title:


CONFIRMED AND ACCEPTED,
as of the date first above written:

MERRILL LYNCH & CO.
Merrill Lynch, Pierce, Fenner & Smith
  Incorporated and
DEAN WITTER REYNOLDS INC.


By: Merrill Lynch, Pierce, Fenner & Smith
       Incorporated



By:________________________________________
Name:
Title:

For themselves and as Representatives of the
Other Underwriters Named in Schedule A hereto.





                                      -27-
<PAGE>   29
                                                                      SCHEDULE A



<TABLE>
<CAPTION>
                                                                                          Number of Initial
Name of Underwriter                                                              Securities to be Purchased
-------------------                                                              --------------------------
<S>                                                                                     <C>
Merrill Lynch, Pierce, Fenner & Smith                                            
                 Incorporated . . . . . . . . . . . . . . . . . . . . . .        
Dean Witter Reynolds Inc. . . . . . . . . . . . . . . . . . . . . . . . .        
                                                                                 
                                                                                 
                                                                                 
                                                                                 
                                                                                 
                                                                                                            
                                                                                        ---------
                                                                                 
                                                                                 
         Total  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               6,800,000
                                                                                        =========
</TABLE>                                                                     





                                      -28-
<PAGE>   30
                                                                      SCHEDULE B




MW Petroleum Corporation

[Others]





                                      -29-
<PAGE>   31
                                                                      SCHEDULE C




[APC Operating Partnership L.P.
Apache 681/682 Joint Venture]





                                      -30-

<PAGE>   1

                                                                     EXHIBIT 5.1

                             [APACHE LETTERHEAD]


                               August 28, 1995


Apache Corporation
2000 Post Oak Boulevard, Suite 100
Houston, Texas 77056-4400


Ladies and Gentlemen:

        I am General Counsel to Apache Corporation, a Delaware corporation (the
"Company"), and am rendering this opinion in my capacity as such in connection
with the registration under the Securities Act of 1933, as amended, of an
aggregate of 7,820,000 shares of the Company's common stock, $1.25 par value
("Common Stock"), to be offered upon the terms and subject to the conditions
set forth in a proposed Purchase Agreement by and between the Company and
Merrill Lynch, Pierce Fenner & Smith Incorporated and Dean Witter Reynolds Inc.
as representatives of the several underwriters (the "Purchase Agreement").

        In connection therewith, I have examined the Registration Statement on
Form S-3 (the "Registration Statement") covering the shares to be registered to
be filed with the Securities and Exchange Commission, originals or copies
certified or otherwise identified to my satisfaction of the Restated Certificate
of Incorporation of the Company and the Bylaws of the Company, each as amended
to date, the corporate proceedings with respect to the offering of shares and
such other documents and instruments as I have deemed necessary or appropriate
for the expression of the opinions contained herein.

        I have assumed the authenticity and completeness of all records,
certificates and other instruments submitted to me as originals, the conformity
to original documents of all records, certificates and other instruments
submitted to me as copies, the authenticity and completeness of originals of
those records, certificates and other instruments submitted to me as copies and
the correctness of all statements of fact contained in all records, certificates
and other instruments that I have examined.

        Based on the foregoing, and having regard for such legal considerations
as I have deemed relevant, I am of the opinion that the 7,820,000 shares of
Common Stock proposed to be issued have been duly and validy authorized for
issuance and, when issued in accordance with the terms of the Purchase
Agreement, which is to be filed as an exhibit to the Registration Statement,
will be duly and validly issued, fully paid and nonassessable.
<PAGE>   2
        I hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the use of my name under the caption "Legal
Matters" in the Prospectus included as part of the Registration Statement.


                                        Very truly yours,

                                        /s/ Z. S. KOBIASHVILI
                                        ----------------------
                                           Z. S. Kobiashvili


<PAGE>   1
 
                                                                    EXHIBIT 23.1
 
                         CONSENT OF ARTHUR ANDERSEN LLP
 
     As independent public accountants, we hereby consent to the incorporation
by reference in this registration statement of our report dated March 14, 1995
on the audited Statement of Combined Revenues and Direct Operating Expenses for
the Oil and Gas Properties of Texaco Exploration and Production Inc. Sold to
Apache Corporation and to the incorporation by reference in this registration
statement of our report dated May 17, 1995 on the audited restated consolidated
financial statements of Apache Corporation and subsidiaries included in Apache
Corporation's Annual Report on Form 10-K/A for the year ended December 31, 1994,
and to all references to our Firm included in this registration statement.
 
                                          ARTHUR ANDERSEN LLP
 
Houston, Texas
August 28, 1995

<PAGE>   1
 
                                                                    EXHIBIT 23.2
 
                       [LETTERHEAD OF COOPERS & LYBRAND]
 
                          CONSENT OF COOPERS & LYBRAND
 
     We consent to the incorporation by reference in this registration statement
of Apache Corporation on Form S-3 of our report dated February 13, 1995 on our
audits of the consolidated financial statements of DEKALB Energy Company as of
December 31, 1994 and 1993 and for the years ended December 31, 1994, 1993 and
1992 and our report dated February 13, 1995 on our audit of the associated
financial statement schedule of DEKALB Energy Company, which reports are
incorporated by reference herein. We also consent to all references to our firm
included in this registration statement of Apache Corporation on Form S-3.
 
                                          /s/  COOPERS & LYBRAND
 
                                          --------------------------------------
 
                                          Coopers & Lybrand
                                          Chartered Accountants
 
Calgary, Alberta, Canada
August 28, 1995

<PAGE>   1
 
                                                                    EXHIBIT 23.3
 
              [RYDER SCOTT COMPANY PETROLEUM ENGINEERS LETTERHEAD]
 
                                    CONSENT
 
     As independent petroleum engineers, we hereby consent to the inclusion
and/or incorporation by reference in this registration statement of Apache
Corporation on Form S-3 of our Firm's review of the proved oil and gas reserve
quantities of Apache Corporation, DEKALB Energy Company, and of certain
properties acquired from Texaco Exploration and Production Inc. as of January 1,
1995, and to all references to our Firm's name and review included in this
registration statement of Apache Corporation on Form S-3.
 
                                          /s/  RYDER SCOTT COMPANY
                                               PETROLEUM ENGINEERS
 
Houston, Texas
August 28, 1995

<PAGE>   1
                                                                   EXHIBIT 23.4
[NETHERLAND, SEWELL & ASSOCIATES, INC. LETTERHEAD]





                  CONSENT OF INDEPENDENT PETROLEUM ENGINEERS



        We hereby consent to the inclusion in this registration statement of
Apache Corporation on Form S-3 to our Firm's report on proved oil and gas
reserve quantities of Aquila Energy Resources Corporation, as of December 31,
1994, and to all references to our Firm's name and report included in this
registration statement of Apache Corporation on Form S-3.


                                      NETHERLAND, SEWELL & ASSOCIATES, INC.


                                      By:  /s/  DANNY D. SIMMONS
                                          -------------------------------------
                                                Danny D. Simmons
                                                Senior Vice President

Houston, Texas
August 28, 1995

<PAGE>   1
                                                                  EXHIBIT 99.1


                       [RYDER SCOTT COMPANY LETTERHEAD]





                               January 20, 1995





Apache Corporation
2000 Post Oak Blvd., Suite 100
Houston, Texas 77056-4400

Gentlemen:

     At your request, Ryder Scott Company Petroleum Engineers (Ryder Scott) has
reviewed estimates of proved hydrocarbon liquid and gas reserves as of January
1, 1995 attributable to interests of Apache Corporation (Apache) in the base
properties and Crystal Oil Company in certain wells or locations. In our
opinion, the overall proved reserves for the reviewed properties as estimated by
Apache are reasonable. The estimates of reserves reviewed by Ryder Scott were
prepared by engineers and geologists on the staff of Apache. The wells or
locations for which estimates of reserves were reviewed by Ryder Scott were
selected by Apache who informed Ryder Scott that these selected reserves
compromised approximately 77.5 percent of the total discounted future net income
at 10 percent attributable to the total interests of Apache including the 1994
Exploration Management System (EMS) wells. The summary tables below present the
estimated net remaining proved reserves as of January 1, 1995 prepared by the
staff of Apache and reviewed by Ryder Scott for both the Total Company,
including EMS wells, and for the EMS wells only. Hydrocarbon liquid volumes are
expressed in standard 42 gallon barrels. All gas volumes are expressed in
millions of cubic feet (MMCF) at the offical temperature and pressure bases of
the areas where the gas reserves are located.



<TABLE>
<CAPTION>

                                                      SEC CASE
                                       Estimated Net Remaining Proved Reserves
                                          Attributable to the Interests of
                                         Apache Corporation (Including EMS)
                                                As of January 1, 1995
                ----------------------------------------------------------------------------
                    Reviewed by Ryder Scott              Not Reviewed                    Total
                    -----------------------         ----------------------       ----------------------
                    Hydrocarbon       Sales         Hydrocarbon      Sales       Hydrocarbon      Sales
                     Liquids           Gas            Liquids         Gas         Liquids          Gas
                     MBarrels          MMCF           MBarrels        MMCF        MBarrels         MMCF
                    -----------       -----         -----------      -----       -----------      -----
<S>                    <C>         <C>                 <C>        <C>              <C>         <C>
Proved
  Reserves              69,038      730,131             25,123     260,133          94,161      990,264

Reserve**
  Adjustments                0            0                284      (5,976)            284       (5,976)
                       -------     --------            -------    --------         -------     --------

Total Proved
  Reserves              69,038      730,131             25,407     254,157          94,445      984,288

</TABLE>


** Gas Balancing, NPI After Payout, and Premium Pricing.
<PAGE>   2
Apache Corporation
January 20, 1995
Page 2



                                   SEC CASE
                   Estimated Net Remaining Proved Reserves
                       Attributable to the Interests of
           The Apache 1994 Exploration Management System Wells Only
                            As of January 1, 1995
           ---------------------------------------------------------

<TABLE>
<CAPTION>

 Reviewed by Ryder Scott                 Not Reviewed                         Total
-------------------------          ------------------------          --------------------
Hydrocarbon      Sales              Hydrocarbon    Sales              Hydrocarbon    Sales
  Liquids         Gas                Liquids        Gas                Liquids        Gas
 MBarrels         MMCF               MBarrels       MMCF               MBarrels       MMCF
-----------     -------             -----------    -------             -----------  -------
   <S>          <C>                     <C>          <C>                 <C>        <C>
   6,444        170,091                 0            0                   6,444      170,091

</TABLE>

     The estimated quantities of reserves in this report are related to
hydrocarbon prices. Apache has assured us that December 1994 hydrocarbon prices
were used in the preparation of their projections as required by SEC guidelines;
however, actual future prices may vary significantly from December 1994 prices.
Therefore, quantities of reserves acutally recovered may differ significantly
from the estimated quantities presented in this report.

REVIEW PROCEDURE AND OPINION

     In our opinion, Apache's estimates of future reserves for the wells and
locations reviewed by Ryder Scott were prepared in accordance with generally 
accepted procedures for the estimation of future reserves. In general, we were
in acceptable agreement on an overall company net equivalent barrel basis (at 6
MCF per barrel) with the estimates prepared by Apache's staff.

     Certain technical personnel of Apache are responsible for the preparation
of reserve estimates on new properties and for the preparation of revised
estimates, when necessary, on old properties. These personnel assembled the
necessary data and maintained the data and work papers in an orderly manner.
Ryder Scott consulted with these technical personnel and had access to their
work papers and supporting data in the course of our review.

     In performing our review, we relied upon data furnished by Apache with
respect to property interests owned, production and well tests from examined
wells, geological maps, well logs, core analyses, and pressure measurements.
These data were accepted as authentic and sufficient for determining the
reserves unless, during the course of our examination, a matter of question came
to our attention in which case the data were not accepted until all questions
were satisfactorily resolved. Our review included such tests and procedures as
we considered necessary under the circumstances to render the conclusions set
forth herein.

RESERVE ESTIMATES

     In general, the reserves for the wells and locations reviewed by Ryder
Scott were estimated by performance methods or the volumetric method; however,
other methods were used in certain cases where characteristics of the data
indicated such methods were more appropriate.

     The estimates of reserves by the performance method utilized extrapolations
of various historical data in those cases where such data were definitive.
Reserves were estimated by the volumetric method in those cases where there
was inadequate historical data to establish a definitive trend or where the use
of production performance data as a basis for the reserve estimates was
considered to be inappropriate and the volumetric data were adequate for a
reasonable estimate.



                 RYDER SCOTT COMPANY     PETROLEUM ENGINEERS
<PAGE>   3
Apache Corporation
January 20, 1995
Page 3


     The reserves presented herein are estimates only and should not be 
construed as being exact quantities. Moreover, estimates of reserves may 
increase or decrease as a result of future operations.

     The proved reserves, which are attributable to the wells and locations
reviewed by Ryder Scott, conform to the definition as set forth in the
Securities and Exchange Commission's Regulation S-X Part 210.4-10 (a) as
clarified by subsequent Commission Staff Accounting Bulletins and are based on
the following definition and criteria:
        
          Proved reserves of crude oil, condensate, natural gas, and natural
    gas liquids are estimated quantities that geological and engineering data
    demonstrate with reasonable certainty to be recoverable in the future from
    known reservoirs under existing conditions. Reservoirs are considered
    proved if economic producibility is supported by actual production or
    formation tests. In certain instances, proved reserves are assigned on the
    basis of a combination of core analysis and electrical and other type logs
    which indicate the reservoirs are analogous to reservoirs in the same field
    which are producing or have demonstrated the ability to produce on a
    formation test. The area of a reservoir considered proved includes (1) that
    portion delineated by drilling and defined by fluid contacts, if any, and
    (2) the adjoining portions not yet drilled that can be reasonably judged as
    economically productive on the basis of available geological and
    engineering data. In the absence of data on fluid contacts, the lowest
    known structural occurrence of hydrocarbons controls the lower proved
    limit of the reservoir. Proved reserves are estimates of hydrocarbons to
    be recovered from a given date forward. They may be revised as hydrocarbons
    are produced and additional data become available. Proved natural gas
    reserves are comprised of non-associated, associated, and dissolved gas. An
    appropriate reduction in gas reserves has been made for the expected
    removal of natural gas liquids, for lease and plant fuel and the exclusion
    of non-hydrocarbon gases if they occur in significant quantities and are
    removed prior to sale. Reserves that can be produced economically through
    the application of improved recovery techniques are included in the proved
    classification when these qualifications are met: (1) successful testing by
    a pilot project or the operation of an installed program in the reservoir
    provides support for the engineering analysis on which the project or
    program was based, and (2) it is reasonably certain the project will
    proceed. Improved recovery includes all methods for supplementing natural
    reservoir forces and energy, or otherwise increasing ultimate recovery from
    a reservoir, including (1) pressure maintenance, (2) cycling, and (3)
    secondary recovery in its original sense. Improved recovery also includes
    the enhanced recovery methods of thermal, chemical flooding, and the use of
    miscible and immiscible displacement fluids. Estimates of proved reserves
    do not include crude oil, natural gas, or natural gas liquids being held
    in underground storage.      
        
GENERAL

     In general, the estimates of reserves for the wells and locations reviewed
by Ryder Scott are based on data available through September 1994.

     Gas imbalances, if any, were not taken into account in the gas reserve
estimates reviewed by Ryder Scott.

     Neither we nor any or our employees have any interest in the subject
properties and neither the employment to do this work nor the compensation is
contingent on our estimates of reserves for the properties which were reviewed.




                 RYDER SCOTT COMPANY     PETROLEUM ENGINEERS

<PAGE>   4
Apache Corporation
January 20, 1995
Page 4


     This report was prepared for the exclusive use of Apache. The data and
work papers used in the preparation of this report are available for
examination by authorized parties in our offices. Please contact us if we can
be of further service.


                                       Very truly yours,

                                       RYDER SCOTT COMPANY
                                       PETROLEUM ENGINEERS



                                       /s/ DON P. ROESLE
                                       Don P. Roesle, P.E.
                                       Group Vice President

DPR/sw





                   RYDER SCOTT COMPANY  PETROLEUM ENGINEERS




<PAGE>   5
                                                                    

[RYDER SCOTT COMPANY PETROLEUM ENGINEERS LETTERHEAD]


                               January 23, 1995



Apache Corporation
2000 Post Oak Blvd., Suite 100
Houston, Texas 77056-4400

Gentlemen:

         At your request, Ryder Scott Company Petroleum Engineers (Ryder Scott)
has reviewed estimates of proved hydrocarbon liquid and gas reserves prepared
by Apache Corporation (Apache) as of January 1, 1995 attributable to interests
of Apache Oil Australia PTY Ltd. (Apache Oil) and Hadson Energy Limited (Hadson
Limited) in certain wells. In our opinion, the overall proved reserves for the
reviewed properties as estimated by Apache are reasonable. The estimates of
reserves reviewed by Ryder Scott were prepared by engineers and geologists on
the staff of Apache. Apache has informed Ryder Scott that the estimates of
reserves reviewed by Ryder Scott represent 100 percent of the total discounted
future net income at 10 percent attributable to the interests of Apache Oil and
Hadson Limited. The summary tables below present the estimated net remaining
proved reserves as of January 1, 1995 prepared by the staff of Apache and
reviewed by Ryder Scott. Hydrocarbon liquid volumes are expressed in standard
42 gallon barrels.

                                   SEC CASE
                   Estimated Net Remaining Proved Reserves
                       Attributable to the Interests of
           Apache Oil Australia PTY Ltd. And Hadson Energy Limited
                            As of January 1, 1995
           -------------------------------------------------------

                                          Reviewed by Ryder Scott
                                          -----------------------
                                          Hydrocarbon      Sales
                                            Liquids         Gas
                                            Barrels         MMCF
                                          -----------      ------
           Total Proved Reserves           5,463,093       31,971

         The estimated quantities of reserves in this report are related to
hydrocarbon prices. Apache has assured us that December 1994 hydrocarbon prices
were used in the preparation of their projections as required by SEC
guidelines; however, actual future prices may vary significantly from December
1994 prices. Therefore, quantities of reserves actually recovered may differ
significantly from the estimated quantities presented in this report.

Review Procedure and Opinion

         In our opinion, Apache's estimates of future reserves for the wells
reviewed by Ryder Scott were prepared in accordance with generally accepted
procedures for the estimation of future reserves. In general, we were in
acceptable agreement on an overall company basis with the estimates prepared by
Apache's staff.

         Certain technical personnel of Apache are responsible for the
preparation of reserve estimates on new properties and for the preparation of
revised estimates, when necessary, on old




<PAGE>   6
Apache Corporation
January 23, 1995
Page 2

properties. These personnel assembled the necessary data and maintained the
data and work papers in an orderly manner. Ryder Scott consulted with these
technical personnel and had access to their work papers and supporting data in
the course of our review.

        In performing our review, we relied upon data furnished by Apache with
respect to property interests owned, production and well tests from examined
wells, geological maps, well logs, core analyses, and pressure measurements.
These data were accepted as authentic and sufficient for determining the
reserves unless, during the course of our examination, a matter of question
came to our attention in which case the data were not accepted until all
questions were satisfactorily resolved. Our review included such tests and
procedures as we considered necessary under the circumstances to render the
conclusions set forth herein.


RESERVE ESTIMATES

        In general, the reserves for the wells and locations reviewed by Ryder
Scott were estimated by performance methods or the volumetric method; however,
other methods were used in certain cases where characteristics of the data
indicated such methods were more appropriate.

        The estimates of reserves by the performance method utilized
extrapolations of various historical data in those cases where such data were
definitive. Reserves were estimated by the volumetric method in those cases
where there was inadequate historical data to establish a definitive trend or
where the use of production performance data as a basis for the reserve
estimates was considered to be inappropriate and the volumetric data were
adequate for a reasonable estimate.

        The reserves presented herein are estimates only and should not be
construed as being exact quantities. Moreover, estimates of reserves may
increase or decrease as a result of future operations.

        The proved reserves, which are attributable to the wells and locations
reviewed by Ryder Scott, conform to the definition as set forth in the
Securities and Exchange Commission's Regulation S-X Part 210.4-10(a) as
clarified by subsequent Commission Staff Accounting Bulletins and are based on
the following definition and criteria:

        Proved reserves of crude oil, condensate, natural gas, and
    natural gas liquids are estimated quantities that geological and
    engineering data demonstrate with reasonable certainty to be recoverable in
    the future from known reservoirs under existing conditions. Reservoirs are
    considered proved if economic producibility is supported by actual
    production or formation tests. In certain instances, proved reserves are
    assigned on the basis of a combination of core analysis and electrical and
    other type logs which indicate the reservoirs are analogous to reservoirs
    in the same field which are producing or have demonstrated the ability to
    produce on a formation test. The area of a reservoir considered proved
    includes (1) that portion delineated by drilling and defined by fluid
    contacts, if any, and (2) the adjoining portions not yet drilled that can
    be reasonably judged as economically productive on the basis of available
    geological and engineering data. In the absence of data on fluid contacts,
    the lowest known structural occurrence of hydrocarbons controls the lower
    proved limit of the reservoir. Proved reserves are estimates of
    hydrocarbons to be recovered from a given date forward. They may be revised
    as hydrocarbons are produced and additional data become available. Proved
    natural gas reserves are comprised of non-associated, associated, and
    dissolved gas. An appropriate reduction in gas reserves has been made for
    the expected removal of natural gas liquids, for lease and plant fuel and
    the exclusion of non-hydrocarbon gases if they occur in significant
    quantities and are removed prior to sale. Reserves that can
        



        
<PAGE>   7
Apache Corporation
January 23, 1995
Page 3


     be produced economically through the application of improved recovery
     techniques are included in the proved classification when these
     qualifications are met: (1) successful testing by a pilot project or the
     operation of an installed program in the reservoir provides support for
     the engineering analysis on which the project or program was based, and
     (2) it is reasonably  certain the project will proceed. Improved recovery
     includes all methods for supplementing natural reservoir forces and
     energy, or otherwise increasing ultimate recovery from a reservoir,
     including (1) pressure maintenance, (2) cycling, and (3) secondary
     recovery in its original sense. Improved recovery also includes the
     enhanced recovery methods of thermal, chemical flooding, and the use of
     miscible and immiscible displacement fluids. Estimates of proved reserves
     do not include crude oil, natural gas, or natural gas liquids being held
     in underground storage.

General
-------

     In general, the estimates of reserves for the wells and locations reviewed
by Ryder Scott are based on data available through October 1994.

     Neither we nor any of our employees have any interest in the subject
properties and neither the employment to do this work nor the compensation is
contingent on our estimates of reserves for the properties which were reviewed.

     This report was prepared for the exclusive use of Apache. The data and
work papers used in the preparation of this report are available for
examination by authorized parties in our offices. Please contact us if we can
be of further service.


                                        Very truly yours,


                                        RYDER SCOTT COMPANY
                                        PETROLEUM ENGINEERS


                                        /s/  DON P. ROESLE

                                        Don P. Roesle, P.E.
                                        Group Vice President

DPR/sw





<PAGE>   1
                                                                   EXHIBIT 99.2


                       [RYDER SCOTT COMPANY LETTERHEAD]


                          February 6, 1995



DEKALB Energy Canada Ltd.
700 - 9th Avenue S.W.
Calgary, Alberta T2P 3V4

Gentlemen:

     At your request, Ryder Scott Company Petroleum Engineers (Ryder Scott) has
reviewed estimates of proved hydrocarbon liquid and gas reserves as of January
1, 1995 attributable to interests of DEKALB Energy Canada Ltd. (DEKALB) in
certain wells or locations. In our opinion, the overall proved reserves for the
reviewed properties as estimated by DEKALB are reasonable. The estimates of
reserves reviewed by Ryder Scott were prepared by engineers and geologists on
the staff of DEKALB. The wells or locations for which estimates of reserves
were reviewed by Ryder Scott comprised approximately 83.9 percent of the total
discounted future net income at 10 percent attributable to the total interests
of DEKALB, according to economic forecasts supplied by DEKALB. The summary
tables below present the estimated net remaining proved reserves as of January
1, 1995 prepared by the staff of DEKALB and reviewed by Ryder Scott for the
total company. Hydrocarbon liquid volumes are expressed in standard 42 gallon
barrels. All gas volumes are expressed in millions of cubic feet (MMCF) at the
official temperature and pressure bases of the areas where the gas reserves are
located.


<TABLE>
<CAPTION>
                                                          SEC CASE
                                           Estimated Net Remaining Proved Reserves
                                              Attributable to the Interests of
                                                 DEKALB Energy Canada Ltd.
                                                   As of January 1, 1995
                      ----------------------------------------------------------------------------------
                      Reviewed by Ryder Scott           Not Reviewed                     Total
                      -----------------------       ---------------------         ----------------------
                      Hydrocarbon      Sales        Hydrocarbon     Sales         Hydrocarbon     Sales
                        Liquids         Gas           Liquids        Gas            Liquids        Gas
                       MBarrels         MMCF         MBarrels        MMCF          MBarrels        MMCF
                      -----------      -----        -----------     -----         -----------     ------
<S>                     <C>            <C>            <C>            <C>            <C>          <C>
Total Proved
  Reserves              8,473          249,689        2,243          50,207         10,716       299,896
</TABLE>

     The estimated quantities of reserves in this report are related to
hydrocarbon prices. DEKALB has assured us that December 1994 hydrocarbon prices
were used in the preparation of their projections as required by SEC guidelines;
however, actual future prices may vary significantly from December 1994 prices.
Therefore, quantities of reserves actually recovered may differ significantly
from the estimated quantities presented in this report.

Review Procedure and Opinion

     In our opinion, DEKALB's estimates of future reserves for the wells and
locations reviewed by Ryder Scott were prepared in accordance with generally
accepted procedures for the estimation of future reserves. In general, we were 
in acceptable agreement on an overall company net equivalent barrel basis (at 
6 MCF per barrel) with the estimates prepared by DEKALB's staff.



<PAGE>   2
DEKALB Energy Canada, Inc.
February 6, 1995
Page 2


     Certain technical personnel of DEKALB are responsible for the preparation
of reserve estimates on new properties and for the preparation of revised
estimates, when necessary, on old properties. These personnel assembled the
necessary data and maintained the data and work papers in an orderly manner.
Ryder Scott consulted with these technical personnel and had access to their
work papers and supporting data in the course of our review.

     In performing our review, we relied upon data furnished by DEKALB with
respect to property interests owned, production and well tests from examined
wells, geological maps, well logs, core analyses, and pressure measurements.
These data were accepted as authentic and sufficient for determining the
reserves unless, during the course of our examination, a matter of question
came to our attention in which case the data were not accepted until all
questions were satisfactorily resolved. Our review included such tests and
procedures as we considered necessary under the circumstances to render the
conclusions set forth herein.

RESERVE ESTIMATES

     In general, the reserves for the wells and locations reviewed by Ryder
Scott were estimated by performance methods or the volumetric method; however,
other methods were used in certain cases where characteristics of the data
indicated such methods were more appropriate.

     The estimates of reserves by the performance method utilized
extrapolations of various historical data in those cases where such data were
definitive. Reserves were estimated by the volumetric method in those cases
where there was inadequate historical data to establish a definitive trend or
where the use of production performance data as a basis for the reserve
estimates was considered to be inappropriate and the volumetric data were
adequate for a reasonable estimate.

     The reserves presented herein are estimates only and should not be
construed as being exact quantities. Moreover, estimates of reserves may
increase or decrease as a result of future operations.

     The proved reserves, which are attributable to the wells and locations
reviewed by Ryder Scott, conform to the definition as set forth in the
Securities and Exchange Commission's Regulation S-X Part 210.4-10 (a) as
clarified by subsequent Commission Staff Accounting Bulletins and are based on
the following definition and criteria:

          Proved reserves of crude oil, condensate, natural gas, and natural
     gas liquids are estimated quantities that geological and engineering data
     demonstrate with reasonable certainty to be recoverable in the future from
     known reservoirs under existing conditions. Reservoirs are considered
     proved if economic producibility is supported by actual production or
     formation tests. In certain instances, proved reserves are assigned on the
     basis of a combination of core analysis and electrical and other type logs
     which indicate the reservoirs are analogous to reservoirs in the same
     field which are producing or have demonstrated the ability to produce on a
     formation test. The area of a reservoir considered proved includes (1)
     that portion delineated by drilling and defined by fluid contacts, if any,
     and (2) the adjoining portions not yet drilled that can be reasonably
     judged as economically productive on the basis of available geological and
     engineering data. In the absence of data on fluid contacts, the lowest
     known structural occurrence of hydrocarbons controls the lower proved
     limit of the reservoir. Proved reserves are estimates of hydrocarbons to
     be recovered from a given date forward. They may be revised as
     hydrocarbons are produced and additional data become available. Proved
     natural gas reserves are comprised of non-associated, associated, and





                   RYDER SCOTT COMPANY  PETROLEUM ENGINEERS





<PAGE>   3
DEKALB ENERGY CANADA, LTD.
February 6, 1995
Page 3

     dissolved gas. An appropriate reduction in gas reserves has been made
     for the expected removal of natural gas liquids, for lease and plant fuel
     and the exclusion of non-hydrocarbon gases if they occur in significant
     quantities and are removed prior to sale. Reserves that can be produced
     economically through the application of improved recovery techniques are
     included in the proved classification when these qualifications are met:
     (1) successful testing by a pilot project or the operation of an installed
     program in the reservoir provides support for the engineering analysis on
     which the project or program was based, and (2) it is reasonably certain
     the project will proceed. Improved recovery includes all methods for
     supplementing natural reservoir forces and energy, or otherwise increasing
     ultimate recovery from a reservoir, including (1) pressure maintenance,
     (2) cycling, and (3) secondary recovery in its original sense. Improved
     recovery also includes the enhanced receovery methods of thermal, chemical
     flooding, and the use of miscible and immiscible displacement fluids.
     Estimates of proved reserves do not include crude oil, natural gas, or
     natural gas liquids being held in underground storage.

GENERAL

     In general, the estimates of reserves for the wells and locations
reviewed by Ryder Scott are based on data available through September 1994.

     Gas imbalances, if any, were not taken into account in the gas reserve
estimates reviewed by Ryder Scott.

     Neither we nor any of our employees have any interest in the subject
properties and neither the employment to do this work nor the compensation is
contingent on our estimates of reserves for the properties which were reviewed.

     This report was prepared for the exclusive use of DEKALB. The data and
work papers used in the preparation of this report are available for
examination by authorized parties in our offices. Please contact us if we can
be of further service.

                                        Very truly yours,

                                        RYDER SCOTT COMPANY
                                        PETROLEUM ENGINEERS

                                        /s/ KENT A. WILLIAMSON
                                        ------------------------

                                        Kent A. Williamson, P.E.
                                        Group Vice President

KAW/sw



                 RYDER SCOTT COMPANY     PETROLEUM ENGINEERS



<PAGE>   1
                                                                  EXHIBIT 99.3


                       [RYDER SCOTT COMPANY LETTERHEAD]





                               August 21, 1995





Apache Corporation
2000 Post Oak Blvd., Suite 100
Houston, Texas 77056-4400

Gentlemen:

     At your request, Ryder Scott Company Petroleum Engineers (Ryder Scott) has
reviewed estimates of proved hydrocarbon liquid and gas reserves as of 
January 1,1995 attributable to interests of Apache Corporation (Apache) in
specified Texaco acquisition properties.  In our opinion, the overall proved
reserves for the reviewed properties as estimated by Apache are reasonable. The
estimates of reserves reviewed by Ryder Scott were prepared by engineers and
geologists on the staff of Apache. The wells or locations for which estimates
of reserves were reviewed by Ryder Scott were selected by Apache who informed
Ryder Scott that these selected reserves compromised approximately 85 percent
of the total discounted future net income at 10 percent attributable to the
total interests of Apache.  The summary tables below present the estimated net
remaining proved reserves as of January 1, 1995 prepared by the staff of Apache
and reviewed by Ryder Scott. Hydrocarbon liquid volumes are expressed in
standard 42 gallon barrels. All gas volumes are expressed in millions of cubic
feet (MMCF) at the official temperature and pressure bases of the areas where
the gas reserves are located.
        


<TABLE>
<CAPTION>

                                                    SEC CASE
                                     Estimated Net Remaining Proved Reserves
                                        Attributable to the Interests of
                           Apache Corporation - Specified Texaco Acquisition Properties
                                              As of January 1, 1995
                ----------------------------------------------------------------------------
                    Reviewed by Ryder Scott              Not Reviewed                    Total
                    -----------------------         ----------------------       ----------------------
                    Hydrocarbon       Sales         Hydrocarbon      Sales       Hydrocarbon      Sales
                     Liquids           Gas            Liquids         Gas         Liquids          Gas
                     MBarrels          MMCF           MBarrels        MMCF        MBarrels         MMCF
                    -----------       -----         -----------      -----       -----------      -----
<S>                   <C>            <C>               <C>            <C>           <C>           <C>
Total Proved
  Reserves            57,923         144,920           15,674         41,575        73,597        186,495
</TABLE>

The estimated quantities of reserves in this report are related to hydrocarbon
prices. Apache has assured us that December 1994 hydrocarbon prices were used
in the preparation of their projections as required by SEC guidelines; however,
actual future prices may vary significantly from December 1994 prices.
Therefore, quantities of reserves actually recovered may differ significantly
from the estimated quantities presented in this report.
        
<PAGE>   2
APACHE CORPORATION
January 20, 1995
Page 2

REVIEW PROCEDURE AND OPINION

     In our opinion, Apache's estimates of future reserves for the wells and
locations reviewed by Ryder Scott were prepared in accordance with generally
accepted procedures for the estimation of future reserves. In general, we were
in acceptable agreement on an overall company net equivalent barrel basis (at 6
MCF per barrel) with the estimates prepared by Apache's staff.

     Certain technical personnel of Apache are responsible for the preparation
of reserve estimates on new properties and for the preparation of revised
estimates, when necessary, on old properties. These personnel assembled the
necessary data and maintained the data and work papers in an orderly manner.
Ryder Scott consulted with these technical personnel and had access to their
work papers and supporting data in the course of our review.

     In performing our review, we relied upon data furnished by Apache with
respect to property interests owned, production and well tests from examined
wells, geological maps, well logs, core analyses, and pressure measurements.
These data were accepted as authentic and sufficient for determining the
reserves unless, during the course of our examination, a matter of question
came to our attention in which case the data were not accepted until all
questions were satisfactorily resolved. Our review included such tests and
procedures as we considered necessary under the circumstances to render the
conclusions set forth herein.

RESERVE ESTIMATES

     In general, the reserves for the wells and locations reviewed by Ryder
Scott were estimated by performance methods or the volumetric method; however,
other methods were used in certain cases where characteristics of the data
indicated such methods were more appropriate.

     The estimates of reserves by the performance method utilized
extrapolations of various historical data in those cases where such data were
definitive. Reserves were estimated by the volumetric method in those cases
where there was inadequate historical data to establish a definitive trend or
where the use of production performance data as a basis for the reserve
estimates was considered to be inappropriate and the volumetric data were
adequate for a reasonable estimate.

     The reserves presented herein are estimates only and should not be
construed as being exact quantities. Moreover, estimates of reserves may
increase or decrease as a result of future operations.

     The proved reserves, which are attributable to the wells and locations
reviewed by Ryder Scott, conform to the definition as set forth in the
Securities and Exchange Commission's Regulation S-X Part 210.4-10 (a) as
clarified by subsequent Commission Staff Accounting Bulletins and are based on
the following definition and criteria:

          Proved reserves of crude oil, condensate, natural gas, and natural
    gas liquids are estimated quantities that geological and engineering data
    demonstrate with reasonable certainty to be recoverable in the future from
    known reservoirs under existing conditions. Reservoirs are considered
    proved if economic producibility is supported by actual production or
    formation tests. In certain instances, proved reserves are assigned on the
    basis of a combination of core analysis and electrical and other type logs
    which indicate the reservoirs are analogous to reservoirs in the same field
    which are producing or have demonstrated the ability to produce on a
    formation test. The area of a reservoir considered proved includes (1) that
    portion delineated by drilling and defined by fluid contacts, if any, and
    (2) the adjoining
        



                 RYDER SCOTT COMPANY     PETROLEUM ENGINEERS
<PAGE>   3
APACHE CORPORATION
January 20, 1995
Page 3

     portions not yet drilled that can be reasonably judged as economically
     productive on the basis of available geological and engineering data. In
     the absence of data on fluid contacts, the lowest known structural
     occurrence of hydrocarbons controls the lower proved limit of the
     reservoir. Proved reserves are estimates of hydrocarbons to be recovered
     from a given date forward. They may be revised as hydrocarbons are
     produced and additional data become available. Proved natural gas reserves
     are comprised of non-associated, associated, and dissolved gas. An 
     appropriate reduction in gas reserves has been made for the expected 
     removal of natural gas liquids, for lease and plant fuel and the exclusion
     of non-hydrocarbon gases if they occur in significant quantities and are
     removed prior to sale. Reserves that can be produced economically through
     the application of improved recovery techniques are included in the proved
     classification when these qualifications are met: (1) successful testing
     by a pilot project or the operation of an installed program in the
     reservoir provides support for the engineering analysis on which the
     project or program was based, and (2) it is reasonably certain the project
     will proceed. Improved recovery includes all methods for supplementing
     natural reservoir forces and energy, or otherwise increasing ultimate
     recovery from a reservoir, including (1) pressure maintenance, (2)
     cycling, and (3) secondary recovery in its original sense. Improved
     recovery also includes the enhanced recovery methods of thermal, chemical
     flooding, and the use of miscible and immiscible displacement fluids.
     Estimates of proved reserves do not include crude oil, natural gas, or
     natural gas liquids being held in underground storage.

GENERAL

     In general, the estimates of reserves for the wells and locations
reviewed by Ryder Scott are based on data available through September 1994.

     Gas imbalances, if any, were not taken into account in the gas reserve
estimates reviewed by Ryder Scott.

     Neither we nor any of our employees have any interest in the subject
properties and neither the employment to do this work nor the compensation is
contingent on our estimates of reserves for the properties which were reviewed.

     This report was prepared for the exclusive use of Apache. The data and
work papers used in the preparation of this report are available for
examination by authorized parties in our offices. Please contact us if we can
be of further service.

                                        Very truly yours,

                                        RYDER SCOTT COMPANY
                                        PETROLEUM ENGINEERS

                                        /s/ DON P. ROESLE
                                        ---------------------

                                        Don P. Roesle, P.E.
                                        Senior Vice President

DPR/sw



                  RYDER SCOTT COMPANY     PETROLEUM ENGINEERS

<PAGE>   1
                                                                    EXHIBIT 99.4

              [NETHERLAND, SEWELL & ASSOCIATES, INC. LETTERHEAD]





                               January 19, 1995


Mr. David L. Wilson
Aquila Energy Resource Corporation
Suite 700
10370 Richmond Avenue
Houston, Texas 77042

Dear Mr. Wilson:

        In accordance with your request, we have estimated the proved reserves
and future revenue, as of January 1, 1995, to the Aquila Energy Resources
Corporation (Aquila) interest in certain oil and gas properties located in the 
United States as listed in the accompanying tabulations. This report is based
on constant prices and costs in accordance with the guidelines of the
Securities and Exchange Commission (SEC).

        As presented in the accompanying summary projections, Tables I through
IV, we estimate the net reserves and future net revenue to the Aquila interest,
as of January 1, 1995, to be:


<TABLE>
<CAPTION>  
                                       Net Reserves                  Future Net Revenue
                                 -------------------------      ------------------------------     
                                   Oil              Gas                           Present Worth
           Category              (Barrels)         (MCF)            Total            at 10%   
           --------              ---------      -----------      ------------     -------------
        <S>                      <C>            <C>              <C>               <C>
        Proved Developed
            Producing            1,432,751       60,614,450      $ 62,871,600      $53,092,600
            Non-Producing          678,905       22,560,062        30,563,700       20,363,000
        Proved Undeveloped         669,335       23,359,988        29,413,300       18,411,700
                                 ---------      -----------      ------------      -----------
               Total Proved      2,780,991      106,534,500      $122,848,600      $91,867,300
</TABLE>

        The oil reserves shown include crude oil and condensate. Oil volumes are
expressed in barrels which are equivalent to 42 United States gallons. Gas
volumes are expressed in thousands of standard cubic feet (MCF) at the contract
temperature and pressure bases.

        As shown in the Table of Contents, this report includes summary
projections of reserves and revenue for each reserve category along with
one-line summaries of reserves, economics, and basic data by lease. For the 
purposes of this report, the term "lease" refers to a single economic 
projection.

        The estimated reserves and future revenue shown in this report are for
proved developed producing, proved developed non-producing, and proved
undeveloped reserves. In accordance with SEC Guidelines, our estimates do not 

<PAGE>   2
[NETHERLAND, SEWELL & ASSOCIATES, INC. LETTERHEAD]


inlcude any value for probable or possible reserves which may exist for these
properties. This report does not include any value which could be attributed to
interests in undeveloped acreage beyond those tracts for which undeveloped
reserves have been estimated.

        Future gross revenue to the Aquila interest is prior to deducting state
production taxes and ad valorem taxes. Future net revenue is after deducting
these taxes, future capital costs, and operating expenses, but before
consideration of federal income taxes; future net revenue for the offshore
properties is also after deducting abandonment costs. In accordance with SEC
guidelines, the future net revenue has been discounted at an annual rate of 10
percent to determine its "present worth." The present worth is shown to
indicate the effect of time on the value of money and should not be construed
as being the fair market value of the properties.

        For the purposes of this report, a field inspection of the properties
has not been performed nor has the mechanical operation or condition of the
wells and their related facilities been examined. We have not investigated
possible environmental liability related to the properties; therefore, our
estimates do not include any costs which may be incurred due to such prossible
liability. Our estimates of future revenue do not include any salvage value for
the lease and well equipment nor the cost of abandoning the onshore properties.
Future revenue estimates for offshore properties also do not include any 
salvage value for the lease and well equipment, but do include our estimates 
of the costs to abandon the wells, platforms, and production facilities. 
Abandonment costs for offshore properties are included with other capital 
investments.

        Oil prices used in this report are based on a January 1, 1995 West
Texas Intermediate posted price of $16.00 per barrel, adjusted by lease for
gravity, transportation fees, and regional posted price differentials. Gas
prices used in this report are based on those prices received for each lease on
January 1, 1995. Oil and gas prices are held constant in accordance with SEC 
guidelines.

        Lease and well operating costs are based on operating expense records
of Aquila. These costs include the per-well overhead expenses allowed under
joint operating agreements along with costs estimated to be incurred at and
below the district and field levels. Headquarters general and administrative
overhead expenses of Aquila are not included. Lease and well operating costs
are held constant in accordance with SEC guidelines. Capital costs are included
as required for workovers, new development wells, and production equipment.

        We have made no investigation of potential gas volume and value
imbalances which may have resulted from overdelivery or underdelivery to the
Aquila interest. Therefore, our estimates of reserves and future revenue do not
include adjustments for the settlement of any such imbalances; our projections
are based on Aquila receiving its net revenue interest share of estimated
future gross gas production.
<PAGE>   3
[NETHERLAND, SEWELL & ASSOCIATES, INC. LETTERHEAD]





        The reserves included in this report are estimates only and should not
be construed as exact quantities. They may or may not be recovered; if
recovered, the revenues therefrom and the costs related thereto could be more
or less than the estimated amounts. The sales rates, prices received for the
reserves, and costs incurred in recovering such reserves may vary from
assumptions included in this report due to governmental policies and
uncertainties of supply and demand. Also, estimates of reserves may increase or
decrease as a result of future operations.

        In evaluating the information at our disposal concerning this report, 
we have excluded from our consideration all matters as to which legal or
accounting, rather than engineering, interpretation may be controlling. As in
all aspects of oil and gas evaluation, there are uncertainties inherent in the
interpretation of engineering data; therefore, our conclusions necessarily
represent only informed professional judgments.

        The titles to the properties have not been enamined by Netherland,
Sewell & Associates, Inc., nor has the actual degree or type of interest owned
been independently confirmed. The data used in our estimates were obtained from
Aquila Energy Resources Corporation, other interest owners, various operators
of the properties, and the nonconfidential files of Netherland, Sewell &
Associates, Inc. and were accepted as accurate. We are independent petroleum
engineers and geologists; we do not own an interest in these properties and are
not employed on a contingent basis. Basic geologic and field performance data 
together with our engineering work sheets are maintained on file in our office.


                                  Very truly yours,


                                  /s/  FREDERIC D. SEWELL
                                  ------------------------------------



JJS: CLM
<PAGE>   4
[NETHERLAND, SEWELL & ASSOCIATES, INC.]




                              TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                Table/Page
                                                                  Number
                                                                ----------
<S>                                                                <C>
SUMMARY PROJECTIONS OF RESERVES AND REVENUE                         

      Total Proved Reserves                                           I

      Proved Developed Producing Reserves                            II

      Proved Developed Non-Producing Reserves                       III

      Proved Undeveloped Reserves                                    IV

PROVED DEVELOPED PRODUCING RESERVES

      Summary Projection of Reserves and Revenue                      1
      Reserve, Economics, and Basic Data                              2

PROVED DEVELOPED NON-PRODUCING RESERVES

      Summary Projection of Reserves and Revenue                     50
      Reserves, Economics, and Basic Data                            51

PROVED UNDEVELOPED RESERVES

      Summary Projection of Reserves and Revenue                     63
      Reserves, Economics, and Basic Data                            64

</TABLE>
<PAGE>   5
                   SUMMARY PROJECTION OF RESERVES AND REVENUE
                                     AS OF
                                     1-1-95


<TABLE>
<CAPTION>

AQUILA ENERGY RESOURCES CORPORATION INTEREST                                            SUMMARY - ALL PROPERTIES
                                                                                        AQUILA ENERGY RESOURCES CORP
                                                       TOTAL PROVED RESERVES            TOTAL PROVED RESERVES


                                                              GROSS REVENUE
                                                          INCL PROD+ADVAL TAXES
 PERIOD      GROSS     NET        GROSS         NET        ------------------------   PROD+AV  NET CAP OPERATING   NET     CUM P.W.
 ENDING    OIL/COND  OIL/COND      GAS          GAS        OIL       GAS      TOTAL    TAXES   INVSTMT  EXPENSE  REVENUE   10.000%
 ------    MB------  MB------    MMF---       MMF---      M$---     M$---     M$----  M$-----  M$-----  M$-----  M$-----   M$------
<S>       <C>        <C>       <C>          <C>          <C>      <C>       <C>       <C>      <C>      <C>      <C>       <C>
12-31-95   2405.315   800.887    69443.035   24484.763   12868.9   42605.2   55474.1   1957.8  16986.5  11476.5   25053.3  23797.7
12-31-96   1626.605   560.745    56815.623   19754.599    9054.6   34431.3   43485.9   1562.9   5915.7  10029.9   25977.4  46377.9
12-31-97   1684.970   497.389    43512.086   15305.463    8033.5   26683.0   34716.5   1375.8   5304.1   9040.9   18995.7  61267.1
12-31-98   1058.780   300.692    33891.808   11523.318    4867.2   20052.5   24919.7   1175.2   3370.4   6706.6   13667.5  71057.0
12-31-99    763.132   166.363    28138.691    8704.820    2673.6   15249.7   17923.3    915.0    423.5   4170.4   12414.4  79137.7

12-31- 0    472.304   102.864    18661.219    5607.933    1649.1    9706.2   11355.3    720.7   1476.1   3066.3    6092.2  82721.1 
12-31- 1    392.726    88.385    14207.524    4368.328    1415.2    7527.9    8943.1    636.1    436.9   2595.4    5274.7  85557.0
12-31- 2    269.776    63.147    11567.229    3589.056    1010.8    6182.5    7193.3    503.4     77.3   2291.0    4321.6  87670.3
12-31- 3    258.739    59.093     9768.727    3056.334     945.8    5268.3    6214.1    439.0    103.7   2069.1    3602.3  89273.3 
12-31- 4    198.381    45.871     7896.280    2485.928     733.9    4276.3    5010.2    352.6    590.1   1813.6    2253.9  90191.8

12-31- 5     62.889    19.162     5370.934    1839.349     306.6    3135.2    3441.8    230.5     39.2   1360.1    1812.0  90856.9
12-31- 6     51.862    16.182     4375.623    1555.694     259.2    2650.8    2910.0    193.6      0.0   1252.9    1463.5  91345.0
12-31- 7     42.197    13.603     3455.181    1289.663     217.5    2195.6    2413.1    160.3     30.0   1122.7    1100.1  91678.9
12-31- 8     36.646    14.095     2721.918    1104.689     225.6    1879.8    2105.4    141.5      0.0   1026.2     937.7  91937.8
12-31- 9     28.292    10.473     1904.692     761.036     167.7    1293.7    1461.4     98.8      0.0    888.4     474.2  92056.6

SUBTOTAL   9352.614  2758.951   311730.570  105430.973   44429.2  183138.0  227567.2  10463.2  34753.5  58910.0  123440.5  92056.6

REMAING      57.920    22.040     4793.915    1103.527     353.6    1869.7    2223.3    165.7   1675.0    974.5    -591.9  91867.3

TOTAL OF
29.2 YRS   9410.534  2780.991   316524.485  106534.500   44782.8  185007.7  229790.5  10628.9  36428.5  59884.5  122848.6  91867.3

CUM PROD  35229.436            1257152.726

ULTIMATE  44639.970            1573677.211   

</TABLE>


ALL ESTIMATES HEREIN ARE PART OF THE NETHERLAND, SEWELL  
REPORT AND ARE SUBJECT TO ITS PARAMETERS AND CONDITIONS.

NETHERLAND, SEWELL & ASSOCIATES, INC. - DALLAS & HOUSTON          


BASED ON CONSTANT PRICES AND COSTS

PRESENT WORTH PROFILE
FOR 12.00 PCT, PRESENT WORTH M$      87536.4
FOR 15.00 PCT, PRESENT WORTH M$      81804.9
FOR 18.00 PCT, PRESENT WORTH M$      76831.5
FOR 20.00 PCT, PRESENT WORTH M$      73866.4
FOR 25.00 PCT, PRESENT WORTH M$      67449.7

TABLE I


<PAGE>   6
                                     SUMMARY PROJECTION OF RESERVES AND REVENUE
                                                      AS OF
                                                    1 -1 -95


<TABLE>
<CAPTION>
AQUILA ENERGY RESOURCES CORPORATION INTEREST                                                    SUMMARY - ALL PROPERTIES
                                                                                                AQUILA ENERGY RESOURCES CORP
                                                                                                PROVED DVLPD PRODUCING RESERVES
                                           PROVED DEVELOPED PRODUCING RESERVES


                                                                  GROSS REVENUE                         
                                                              INCL PROD+ADVAL TAXES
 PERIOD     GROSS        NET       GROSS         NET          ---------------------    PROD+AV  NET CAP  OPERATING   NET    CUM P.W.
 ENDING    OIL/COND    OIL/COND     GAS          GAS        OIL        GAS      TOTAL   TAXES   INVSTMT   EXPENSE  REVENUE  10.000%
--------   MB------    MB------    MMF------   MMF------  M$-----    M$-----   M$-----  M$----   M$---   M$-----   M$-----  M$-----
<S>       <C>         <C>         <C>          <C>        <C>       <C>       <C>       <C>     <C>      <C>       <C>      <C> 
12-31-95   2145.543    691.827     56062.564   19680.841  11120.5    33968.4   45088.9  1637.6   4447.6  11281.6   27722.1  26359.2 
12-31-96   1110.483    375.781     35210.199   12427.767   6067.0    21495.2   27562.2  1075.4   4206.7   8735.8   13544.3  38119.0
12-31-97    499.914    126.350     22976.987    7592.431   2012.7    13097.8   15110.5   768.0    447.9   5225.3    8669.3  44946.6
12-31-98    282.549     66.233     16491.759    5077.541   1062.7     8722.0    9784.7   576.5   1224.7   3976.7    4006.8  47813.4
12-31-99    177.984     38.459     12628.717    3755.194    617.6     6420.2    7037.8   445.9    126.2   3159.8    3305.9  49963.9

12-31- 0    121.089     27.597      9289.123    2700.260    442.0     4605.4    5047.4   348.9    900.0   2217.1    1581.4  50884.5 
12-31- 1     94.293     22.124      7511.223    2185.889    354.4     3726.1    4080.5   285.5    166.7   1839.0    1789.3  51844.9
12-31- 2     76.233     18.169      5992.724    1704.762    291.0     2904.1    3195.1   222.1      0.0   1544.4    1428.6  52543.0
12-31- 3     60.228     14.891      4802.977    1346.552    238.5     2294.1    2532.6   175.8      0.0   1354.6    1002.2  52988.6
12-31- 4     47.377     12.051      3892.776    1072.068    192.9     1826.3    2019.2   139.6      0.0   1214.4     665.2  53257.4

12-31- 5     39.234     10.093      3178.250     868.201    161.7     1478.4    1640.1   112.6      0.0   1125.1     402.4  53405.2
12-31- 6     33.387      8.602      2516.694     696.173    137.9     1185.0    1322.9    90.3      0.0   1044.7     187.9  53467.1
12-31- 7     27.456      7.056      1953.273     551.218    113.2      937.2    1050.4    72.0      0.0    972.1       6.3  53468.4
12-31- 8     20.829      5.296      1490.170     421.903     85.0      716.2     801.2    54.3      0.0    880.0    -133.1  53431.4
12-31- 9     16.958      3.909      1055.453     244.995     62.6      415.0     477.6    33.3   1400.0    483.1   -1438.8  53065.9

SUBTOTAL   4753.557   1428.438    185052.889   60325.795  22959.7   103791.4  126751.1  6037.8  12919.8  45053.7   62739.8  53065.9

REMAING      23.480      4.313      1874.758     288.655     69.3      473.2     542.5    39.0      0.0    371.7     131.8  53092.6

TOTAL OF
23.7 YRS   4777.037   1432.751    186927.647   60614.450  23029.0   104264.6  127293.6  6076.8  12919.8  45425.4   62871.6  53092.6

CUM PROD  34890.898              1245942.437

ULTIMATE  39667.935              1432870.084

</TABLE>

ALL ESTIMATES HEREIN ARE PART OF THE NETHERLAND, SEWELL  
REPORT AND ARE SUBJECT TO ITS PARAMETERS AND CONDITIONS. 


NETHERLAND, SEWELL & ASSOCIATES, INC. - DALLAS & HOUSTON 


BASED ON CONSTANT PRICES AND COSTS

PRESENT WORTH PROFILE
FOR 12.00 PCT, PRESENT WORTH M$      51543.7
FOR 15.00 PCT, PRESENT WORTH M$      49421.6
FOR 18.00 PCT, PRESENT WORTH M$      47508.7
FOR 20.00 PCT, PRESENT WORTH M$      46334.7
FOR 25.00 PCT, PRESENT WORTH M$      43707.6


Table II
<PAGE>   7
                   SUMMARY PROJECTION OF RESERVES AND REVENUE
                                     AS OF
                                    1-1-95

<TABLE>
<CAPTION>

AQUILA ENERGY RESOURCES CORPORATION INTEREST                                                        SUMMMARY - ALL PROPERTIES
                                                                                                    AQUILA ENERGY RESOURCES CORP
                                                                                                    PROVED DVLPD NON-PRODG RESERVES
                                              PROVED DEVELOPED NON-PRODUCING RESERVES

                                                                                 
                                                               GROSS REVENUE     
                                                          INCL PROD+ADVAL TAXES   
PERIOD        GROSS        NET        GROSS      NET     -----------------------   PROD+AV   NET CAP   OPERATING    NET     CUM P.W.
ENDING       OIL/COND    OIL/COND      GAS       GAS      OIL      GAS     TOTAL   TAXES     INVSTMT    EXPENSE   REVENUE   10.000%
-----      MB--------  MB--------  MMF------   MMF-----  M$----   M$----   M$----- M$-----  M$------   M$-------  M$-----   M$------
<S>        <C>         <C>         <C>        <C>        <C>      <C>     <C>       <C>       <C>      <C>        <C>       <C> 

12-31-95     79.739     13.348      5487.305   1161.886   216.8   2036.4   2253.2   108.4      499.6     84.2     1561.0    1464.0
12-31-96    380.221    105.064     12766.849   3159.344  1708.6   5468.3   7176.9   210.8      347.0   1012.7     5606.4    6317.7
12-31-97    802.883    265.327     11723.500   4067.373  4329.4   7039.5  11368.9   246.1     2839.7   3450.7     4832.4   10078.4
12-31-98    372.950    140.720     10066.263   3715.490  2304.6   6457.1   8761.7   250.0     2145.7   2358.4     4007.6   12951.7
12-31-99    234.726     52.270      9718.133   2937.215   845.8   5257.0   6102.8   168.1      197.3    630.5     5106.9   16273.8
                                                                                                                  
12-31- 0     87.383     21.850      5176.374   1613.970   352.5   2842.1   3194.6   131.2      520.6    492.6     2050.2   17480.8
12-31- 1     51.905     16.545      2970.818   1032.451   265.3   1793.2   2058.5   132.8      241.5    417.2     1267.0   18162.2
12-31- 2     32.803     11.533      2698.062    919.801   184.7   1601.1   1785.8   115.1       44.0    409.2     1217.5   18757.4
12-31- 3     20.935      7.984      2282.388    827.167   127.8   1437.8   1565.6   100.5       75.0    385.0     1005.1   19205.9
12-31- 4     12.878      5.237      2151.349    732.596    83.7   1272.6   1356.3    86.5      545.7    336.1      388.0   19370.1
                                                                                                                  
12-31- 5     13.888      4.904      1212.250    497.724    78.4    850.0    928.4    61.7       39.2    127.8      699.7   19626.5
12-31- 6     10.597      4.044      1052.050    440.926    64.7    752.9    817.6    54.2        0.0    115.7      647.7   19842.9
12-31- 7      8.375      3.460       849.722    363.752    55.1    620.7    675.8    44.8       30.0     70.8      530.2   20004.2
12-31- 8     10.053      5.954       636.649    331.861    95.3    566.3    661.6    46.5        0.0     66.5      548.6   20155.8
12-31- 9      7.204      4.271       289.070    157.203    68.5    268.4    336.9    25.2        0.0     25.5      286.2   20227.7
                                                                                                                  
SUBTOTAL   2126.540    662.511     69080.782  21958.759 10781.2  38263.4  49044.6  1781.9     7525.3   9982.9    29754.5   20227.7

REMAING      31.436     16.394      2469.285    601.303   263.0   1032.9   1295.9   102.4      125.0    259.3      809.2   20363.0

TOTAL OF  
29.2 YRS   2157.976    678.905     71550.067  22560.062 11044.2  39296.3  50340.5  1884.3     7650.3  10242.2    30563.7   20363.0

CUM PROD     71.648                 4076.843

ULTIMATE   2229.624                75626.910

</TABLE>


ALL ESTIMATES HEREIN ARE PART OF THE NETHERLAND, SEWELL
REPORT AND ARE SUBJECT TO ITS PARAMETERS AND CONDITIONS.

NETHERLAND, SEWELL & ASSOCIATES, INC. - DALLAS & HOUSTON

BASED ON CONSTANT PRICES AND COSTS

PRESENT WORTH PROFILE

FOR 12.00 PCT, PRESENT WORTH M$      19048.3
FOR 15.00 PCT, PRESENT WORTH M$      17343.2
FOR 18.00 PCT, PRESENT WORTH M$      15897.6
FOR 20.00 PCT, PRESENT WORTH M$      15050.8
FOR 25.00 PCT, PRESENT WORTH M$      13254.5
                                    
TABLE III
<PAGE>   8
                                   SUMMARY PROJECTION OF RESERVES AND REVENUE
                                                    AS OF
                                                   1-1-95

<TABLE>
<CAPTION>

AQUILA ENERGY RESOURCES CORPORATION INTEREST                                                          SUMMARY - ALL PROPERTIES
                                                                                                      AQUILA ENERGY RESOURCES CORP
                                                                                                      PROVED UNDEVELOPED RESERVES

                                                    PROVED UNDEVELOPED RESERVES

                                                           GROSS REVENUE
                                                       INCL PROD+ADVAL TAXES
PERIOD      GROSS      NET       GROSS      NET        ---------------------    PROD+AV    NET CAP   OPERATING     NET     CUM P.W.
ENDING    OIL/COND  OIL/COND      GAS       GAS        OIL      GAS     TOTAL     TAXES     INVSTNT    EXPENSE    REVENUE   10.000%
--------   MB-----  MB-----     MMF-----   MMF-----   M$----  M$-----  M$-----   M$-----    M$-----   M$----      M$-----  M$------
<S>       <C>       <C>        <C>        <C>        <C>      <C>      <C>       <C>        <C>       <C>         <C>       <C>
12-31-95   180.033   95.712     7893.166   3642.036   1531.6   6600.4   8132.0    211.8     12039.3    110.7      -4229.8   -4025.5 
12-31-96   135.901   79.900     8838.575   4167.488   1279.0   7467.8   8746.8    276.7      1362.0    281.4       6826.7    1941.2
12-31-97   382.173  105.712     8811.599   3645.659   1691.4   6545.7   8237.1    361.7      2016.5    364.9       5494.0    6242.1
12-31-98   403.281   93.739     7333.786   2730.287   1499.9   4873.4   6373.3    348.7         0.0    371.5       5653.1   10291.9
12-31-99   350.422   75.634     5791.841   2012.411   1210.2   3572.5   4782.7    301.0       100.0    380.1       4001.6   12900.0

12-31- 0   263.832   53.417     4195.722   1293.703    854.6   2258.7   3113.3    240.6        55.5    356.6       2460.6   14355.8
12-31- 1   246.528   49.716     3725.483   1149.988    795.5   2008.6   2804.1    217.8        28.7    339.2       2218.4   15549.9
12-31- 2   160.740   33.445     2876.443    964.493    535.1   1677.3   2212.4    166.2        33.3    337.4       1675.5   16369.9
12-31- 3   177.576   36.218     2683.362    882.615    579.5   1536.4   2115.9    162.7        28.7    329.5       1595.0   17078.8
12-31- 4   138.126   28.583     1852.155    681.264    457.3   1177.4   1634.7    126.5        44.4    263.1       1200.7   17564.3

12-31- 5     9.767    4.165      980.434    473.424     66.5    806.8    873.3     56.2         0.0    107.2        709.9   17825.2
12-31- 6     7.878    3.536      806.879    418.595     56.6    712.9    769.5     49.1         0.0     92.5        627.9   18035.0
12-31- 7     6.366    3.087      652.186    374.693     49.2    637.7    686.9     43.5         0.0     79.8        563.6   18206.3
12-31- 8     5.764    2.845      595.099    350.925     45.3    597.3    642.6     40.7         0.0     79.7        522.2   18350.6
12-31- 9     4.130    2.293      560.169    358.838     36.6    610.3    646.9     40.3     -1400.0    379.8       1626.8   18763.0

SUBTOTAL  2472.517  668.002    57596.899  23146.419  10688.3  41083.2  51771.5   2643.5     14308.4   3873.4      30946.2   18763.0

REMAING      3.004    1.333      449.872    213.569     21.3    363.6    384.9     24.3      1550.0    343.5      -1532.9   18411.7

TOTAL OF
17.2 YRS  2475.521  669.335    58046.771  23359.988  10709.6  41446.8  52156.4   2667.8     15858.4   4216.9      29413.3   18411.7

CUM PROD   266.890              7133.446

ULTIMATE  2742.411             65180.217

</TABLE>

ALL ESTIMATES HEREIN ARE PART OF THE NETHERLAND, SEWELL REPORT AND ARE SUBJECT 
TO ITS PARAMETERS AND CONDITIONS.

NETHERLAND, SEWELL & ASSOCIATES, INC. - DALLAS & HOUSTON


BASED ON CONSTANT PRICES AND COSTS

PRESENT WORTH PROFILE
FOR 12.00 PCT, PRESENT WORTH M$      16944.4
FOR 15.00 PCT, PRESENT WORTH M$      15040.1
FOR 18.00 PCT, PRESENT WORTH M$      13425.2
FOR 20.00 PCT, PRESENT WORTH M$      12480.9
FOR 25.00 PCT, PRESENT WORTH M$      10487.6

Table IV


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