APACHE CORP
DEF 14A, 1998-03-30
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
 
                                  SCHEDULE 14A
                                 (RULE 14A-101)
 
                    INFORMATION REQUIRED IN PROXY STATEMENT
 
                            SCHEDULE 14A INFORMATION
 
          PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES
                EXCHANGE ACT OF 1934 (AMENDMENT NO.           )
 
     Filed by the Registrant [X]
     Filed by a Party other than the Registrant [ ]
     Check the appropriate box:
     [ ] Preliminary Proxy Statement       [ ] Confidential, for Use of the
                                               Commission Only (as permitted by
                                               Rule 14a-6(e)(2))
     [X] Definitive Proxy Statement
     [ ] Definitive Additional Materials
     [ ] Soliciting Material Pursuant to sec. 240.14a-11(c) or sec. 240.14a-12


                               Apache Corporation
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified in its Charter)

 
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
     [X] No fee required.
     [ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(l) and
         0-11.
 
     (1) Title of each class of securities to which transaction applies:
 
- --------------------------------------------------------------------------------
     (2) Aggregate number of securities to which transaction applies:
 
- --------------------------------------------------------------------------------
     (3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee
is calculated and state how it was determined):
 
- --------------------------------------------------------------------------------
     (4) Proposed maximum aggregate value of transaction:
 
- --------------------------------------------------------------------------------
     (5) Total fee paid:
 
- --------------------------------------------------------------------------------
 
     [ ] Fee paid previously with preliminary materials.
 
     [ ] Check box if any part of the fee is offset as provided by Exchange Act
Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the Form or Schedule and the date of its filing.
 
     (1) Amount Previously Paid:
 
- --------------------------------------------------------------------------------
     (2) Form, Schedule or Registration Statement No.:
 
- --------------------------------------------------------------------------------
     (3) Filing Party:
 
- --------------------------------------------------------------------------------
     (4) Date Filed:
 
- --------------------------------------------------------------------------------
<PAGE>   2
 
                          [APACHE CORPORATION LOGO]
 
                              ONE POST OAK CENTRAL
                       2000 POST OAK BOULEVARD, SUITE 100
                           HOUSTON, TEXAS 77056-4400
 
                                                                  March 30, 1998
 
FELLOW SHAREHOLDERS:
 
     You are cordially invited to attend the annual meeting of shareholders of
Apache Corporation to be held on Thursday, April 30, 1998, at 10:00 a.m.
(Houston time), at the Doubletree Hotel at Post Oak, 2001 Post Oak Boulevard,
Houston, Texas.
 
     At the annual meeting, shareholders will be asked to vote upon the election
of four directors to the board of directors and approval of the 1998 Stock
Option Plan, and to transact any other business that may properly come before
the meeting. In addition to the scheduled items of business, management will
present a brief report to shareholders on the Company's results and direction. I
hope you will be able to attend.
 
     Whether or not you plan to be present at the annual meeting, please be sure
to date, sign and promptly return the enclosed proxy card or voting instruction
card, using the postage-paid business reply envelope provided, to ensure that
your shares will be voted in accordance with your wishes.
 
                                          /S/ RAYMOND PLANK
 
                                          RAYMOND PLANK
                                          Chairman of the Board
                                            and Chief Executive Officer
<PAGE>   3
 
                               APACHE CORPORATION
                              ONE POST OAK CENTRAL
                       2000 POST OAK BOULEVARD, SUITE 100
                           HOUSTON, TEXAS 77056-4400
 
                            ------------------------
 
                    NOTICE OF ANNUAL MEETING OF SHAREHOLDERS
                            ------------------------
 
TO THE SHAREHOLDERS OF APACHE CORPORATION:
 
     The 1998 annual meeting of shareholders of Apache Corporation, a Delaware
corporation, will be held on Thursday, April 30, 1998, at 10:00 a.m. (Houston
time), at the Doubletree Hotel at Post Oak, 2001 Post Oak Boulevard, Houston,
Texas, for the following purposes:
 
          1. To elect four directors to serve until the annual meeting of
     shareholders in 2001;
 
          2. To approve the 1998 Stock Option Plan; and
 
          3. To transact any other business that may properly come before the
     meeting or any adjournment thereof.
 
     The board of directors of the Company has fixed the close of business on
March 12, 1998, as the record date for the determination of shareholders
entitled to notice of, and to vote at, the annual meeting. Only holders of
record of the Company's common stock at the close of business on the record date
are entitled to notice of, and to vote at, the annual meeting. The Company's
stock transfer books will not be closed. A complete list of shareholders
entitled to vote at the annual meeting will be available for examination by any
Apache shareholder at 2000 Post Oak Boulevard, Suite 100, Houston, Texas, for
purposes pertaining to the annual meeting, during normal business hours for a
period of ten days prior to the meeting.
 
     You are cordially invited to attend the annual meeting. Whether or not you
expect to attend in person, you are urged to promptly sign, date and mail the
enclosed proxy card so that your shares may be represented and voted at the
annual meeting. You may revoke your proxy by following the procedures set forth
in the accompanying proxy statement.
 
                                          By order of the Board of Directors
 
                                          APACHE CORPORATION
 
                                          /s/ C. L. Peper
                                          C. L. PEPER
                                          Corporate Secretary
 
Houston, Texas
March 30, 1998
<PAGE>   4
 
                               APACHE CORPORATION
                              ONE POST OAK CENTRAL
                       2000 POST OAK BOULEVARD, SUITE 100
                           HOUSTON, TEXAS 77056-4400
 
                                                                  March 30, 1998
 
                                PROXY STATEMENT
 
     This proxy statement is being furnished in connection with the solicitation
of proxies by and on behalf of the board of directors of Apache Corporation (the
"Company"), a Delaware corporation, to be used at the 1998 annual meeting of
shareholders and at any adjournment or postponement thereof. This proxy
statement and the accompanying form of proxy were first mailed to the holders of
the Company's common stock, par value $1.25 per share, on or about March 30,
1998.
 
                           PURPOSE OF ANNUAL MEETING
 
     Shareholders of the Company are scheduled to take action on the following
items at the annual meeting:
 
          1. The election of four directors to serve until the annual meeting in
     2001;
 
          2. To approve the 1998 Stock Option Plan; and
 
          3. The transaction of any other business that may properly come before
     the meeting or any adjournment thereof.
 
     As of the date of this proxy statement, the Company is not aware of any
business to come before the annual meeting other than the election of directors
and approval of the 1998 Stock Option Plan.
 
                            QUORUM AND VOTING RIGHTS
 
     The presence, in person or by proxy, of the holders of a majority of the
votes represented by the outstanding shares of the Company's common stock is
necessary to constitute a quorum at the annual meeting. The record date for
determination of shareholders entitled to notice of and to vote at the annual
meeting is the close of business on March 12, 1998. As of the record date, there
were 98,583,981 shares of common stock issued and outstanding. Holders of shares
of common stock are entitled to one vote per share at the annual meeting and are
not allowed to cumulate votes in the election of directors. In accordance with
Delaware law, a shareholder entitled to vote for the election of directors can
withhold authority to vote for all nominees for directors or can withhold
authority to vote for certain nominees for directors.
 
     All shares of the Company's common stock represented by properly executed
proxies will be voted in accordance with the instructions indicated unless the
proxies have been previously revoked. Proxies on which no voting instructions
are indicated will be voted FOR the election of the nominees for directors, FOR
the approval of the 1998 Stock Option Plan, and in the best judgment of the
proxy holders on any other matter that may properly come before the annual
meeting. If a broker indicates on a proxy that it does not have discretionary
authority to vote certain shares on a particular matter, those shares of common
stock will not be considered present and entitled to vote with respect to that
matter. If a shareholder indicates on a proxy card that such shareholder
abstains from voting with respect to approval of the 1998 Stock Option Plan,
those shares will be considered as present and entitled to vote with respect to
that matter, and abstention will have the effect of a vote against approval of
the 1998 Stock Option Plan.
<PAGE>   5
 
                             REVOCABILITY OF PROXY
 
     Shareholders have the unconditional right to revoke their proxies at any
time prior to the voting of their proxies at the annual meeting by (i) filing a
written revocation with the corporate secretary of the Company at the address
set forth above, (ii) giving a duly executed proxy bearing a later date, or
(iii) attending the annual meeting and voting in person. Attendance by
shareholders at the annual meeting will not by itself revoke their proxies.
 
                            SOLICITATION OF PROXIES
 
     Solicitation of proxies for use at the annual meeting may be made in person
or by mail, telephone or telegram, by directors, officers and regular employees
of the Company. These persons will receive no special compensation for any
solicitation activities. The Company has requested banking institutions,
brokerage firms, custodians, trustees, nominees and fiduciaries to forward
solicitation materials to the beneficial owners of shares of the Company's
common stock for whom they are record holder, and the Company will, upon
request, reimburse reasonable forwarding expenses. The Company has retained
Georgeson & Company Inc. to assist in soliciting proxies from brokers, bank
nominees and other institutional holders for a fee not to exceed $7,500, plus
expenses. All costs of the solicitation will be borne by the Company.
 
                             ELECTION OF DIRECTORS
                         (PROPOSAL NO. 1 ON PROXY CARD)
 
     The Company's bylaws provide that the board of directors shall consist of a
minimum of seven and a maximum of 13 directors. The Company's certificate of
incorporation provides that, as nearly as numerically possible, one-third of the
directors shall be elected at each annual meeting of shareholders. Unless
directors earlier resign or are removed, their terms are for three years, and
continue thereafter until their successors are elected and qualify as directors.
The affirmative vote of the holders of a plurality of the shares of common stock
present, in person or represented by proxy, and entitled to vote at the annual
meeting is required to elect directors to the board of directors.
 
     The present terms of directors Eugene C. Fiedorek, W. Brooks Fields, Mary
Ralph Lowe, F. H. Merelli and Raymond Plank will expire at the 1998 annual
meeting. Mr. Merelli was appointed by the board of directors in July 1997, to
succeed Robert V. Gisselbeck who retired from the board in June 1997 after
fifteen years of service.
 
     Mr. Fields, who has served as a director of the Company since 1973, has
chosen not to stand for re-election and will retire from the board of directors
effective as of the date of the 1998 annual meeting. In accordance with the
Company's bylaws, the Company's board of directors will reduce the size of the
board from 13 to 12 members upon Mr. Fields' retirement.
 
     Each of Mr. Fiedorek, Ms. Lowe, Mr. Merelli and Mr. Plank has been
recommended by the Company's nominating committee and nominated by the board of
directors for election by the shareholders to an additional three-year term. If
elected, each will serve commencing upon his or her election and qualification
until the annual meeting of shareholders in 2001.
 
     Unless otherwise instructed, all proxies will be voted in favor of these
nominees. If one or more of the nominees is unwilling or unable to serve, the
proxies will be voted only for the remaining named nominees. Proxies cannot be
voted for more than four nominees. The board of directors knows of no proposed
nominee for director who is unwilling or unable to serve.
 
                                        2
<PAGE>   6
 
                         INFORMATION ABOUT NOMINEES FOR
                             ELECTION AS DIRECTORS
 
     Certain biographical information, including principal occupation and
business experience during the last five years, of each nominee for director is
set forth below. Unless otherwise stated, the principal occupation of each
nominee has been the same for the past five years.
 
<TABLE>
<CAPTION>
                                                              DIRECTOR
                                                               SINCE
                                                              --------
<S>                                                           <C>
EUGENE C. FIEDOREK, 66, has been the managing director of       1988
  EnCap Investments L.C., a Dallas, Texas energy investment
  banking firm, since 1988. Mr. Fiedorek was the managing
  director of the Energy Banking Group of First RepublicBank
  Corp. in Dallas, Texas from 1978 to 1987. He is a director
  of Energy Capital Investment Company, a U.S. oil and gas
  investment firm listed on the London Stock Exchange, and
  Aviva Petroleum Corporation, Dallas, Texas. Mr. Fiedorek
  is a member of the audit committee.
 
MARY RALPH LOWE, 51, has been president and chief executive     1996
  officer of Maralo, Inc., a Houston, Texas independent oil
  and gas exploration and production company, and ranching
  operation, since 1988, and a member of its board of
  directors since 1975. Ms. Lowe is a member of the audit
  committee and the nominating committee.
 
F. H. MERELLI, 61, joined the Company's board of directors      1997
  in July 1997. Since 1992, he has been chairman of the
  board, president and chief executive officer of Key
  Production Company, Inc., a Denver, Colorado independent
  oil and gas exploration and production company. Formerly,
  he served as the Company's president and chief operating
  officer from 1988 to 1991. Prior to that, he was president
  and chief executive officer of Terra Resources, Inc., a
  Tulsa, Oklahoma oil and gas company, from 1979 to 1988.
  Mr. Merelli is a member of the executive committee.
 
RAYMOND PLANK, 75, has been chairman of the board of            1954
  directors and chief executive officer of the Company since
  1979, and served as the Company's president from 1954 to
  1979. Mr. Plank is a member of the executive committee and
  the nominating committee.
</TABLE>
 
                                        3
<PAGE>   7
 
                               INFORMATION ABOUT
                              CONTINUING DIRECTORS
 
     Certain biographical information, including principal occupation and
business experience during the last five years, for each continuing member of
the board of directors whose term is not expiring at the 1998 annual meeting is
set forth below. Unless otherwise stated, the principal occupation of each
nominee has been the same for the past five years.
 
<TABLE>
<CAPTION>
                                                              DIRECTOR    TERM
                                                               SINCE     EXPIRES
                                                              --------   -------
<S>                                                           <C>        <C>
FREDERICK M. BOHEN, 60, has been executive vice president       1981      2000
  and chief operating officer of The Rockefeller University
  since 1990. He was senior vice president of Brown
  University from 1983 to 1990, and served as vice president
  of finance and operations at the University of Minnesota
  from 1981 to 1983. Mr. Bohen was with the U.S. Department
  of Health, Education and Welfare as assistant secretary
  for management and budget from 1977 to 1981. He is a
  director of the College Construction Loan Insurance
  Association (Connie Lee), a director of Oppenheimer and
  Company, and a director of the Mexico Equity Income Fund,
  Inc. Mr. Bohen is chairman of the management development
  and compensation committee and chairman of the stock
  option plan committee.
 
G. STEVEN FARRIS, 50, has been president and chief operating    1994      1999
  officer of the Company since May 1994, and was elected to
  the Company's board of directors in December 1994. He was
  senior vice president of the Company from 1991 to 1994,
  and vice president--exploration and production from 1988
  to 1991. Prior to that, Mr. Farris was vice president of
  finance and acquisitions for Terra Resources, Inc., a
  Tulsa, Oklahoma oil and gas company, from 1983 to 1988,
  and executive vice president for Robert W. Berry, Inc., a
  Tulsa, Oklahoma oil and gas company, from 1978 to 1983.
 
RANDOLPH M. FERLIC, 61, retired in December 1993 from his       1986      1999
  practice as a thoracic and cardiovascular surgeon. He is
  the founder of Surgical Services of the Great Plains,
  P.C., and served as its president from 1974 to 1991. Dr.
  Ferlic is a member of the audit committee, the executive
  committee, and the nominating committee.
 
A. D. FRAZIER, JR., 53, became, in April 1997, president and    1997      1999
  chief executive officer of INVESCO, Inc., a U.S. affiliate
  of AMVESCAP, PLC, a London-based independent global
  investment management firm. He joined INVESCO in November
  1996 as executive vice president and a director of
  INVESCO, PLC. Mr. Frazier was chief operating officer of
  the Atlanta Olympic Games Committee from 1991 to October
  1996, and served as executive vice president, North
  American Banking Group, of First Chicago Corporation and
  First National Bank of Chicago from 1982 to 1991. He is
  also a director of AMVESCAP, PLC, Magellan Health
  Services, Inc., Atlanta, Georgia, and Rock-Tenn Company, a
  Norcross, Georgia manufacturer of packaging and paperboard
  products. Mr. Frazier is a member of the management
  development and compensation committee and the stock
  option plan committee.
 
STANLEY K. HATHAWAY, 73, has been a senior partner in the       1997      2000
  law firm of Hathaway, Speight & Kunz LLC since 1976. From
  June through October 1975, he served as the U.S. Secretary
  of the Interior, and was Governor of the State of Wyoming
  from 1967 to 1975. Mr. Hathaway is chairman of the audit
  committee.
</TABLE>
 
                                        4
<PAGE>   8
 
<TABLE>
<CAPTION>
                                                              DIRECTOR    TERM
                                                               SINCE     EXPIRES
                                                              --------   -------
<S>                                                           <C>        <C>
JOHN A. KOCUR, 70, is engaged in the private practice of        1977      1999
  law. He served as vice chairman of the Company's board of
  directors from 1988 to 1991. Mr. Kocur was employed by the
  Company from 1969 until his retirement in 1991, and served
  as the Company's president from 1979 to 1988. He is
  chairman of the executive committee, chairman of the
  nominating committee, and a member of the management
  development and compensation committee.
 
GEORGE D. LAWRENCE JR., 47, is a private investor, and          1996      2000
  joined the Company's board of directors in May 1996.
  Formerly, he was president, chief executive officer and a
  director of The Phoenix Resource Companies, Inc. from 1990
  until May 1996, when Phoenix became a wholly-owned
  subsidiary of the Company. Mr. Lawrence is a member of the
  executive committee and the management development and
  compensation committee.
 
JOSEPH A. RICE, 73, retired in 1988 as chairman of the          1989      2000
  board, chief executive officer and a director of Irving
  Trust Company and Irving Bank Corporation, having served
  in those capacities since 1984. Mr. Rice served as
  president, chief operating officer and a director of those
  organizations from 1975 to 1984. He was a director of Avon
  Products, Inc. from 1982 to May 1997. Mr. Rice is a member
  of the management development and compensation committee
  and the stock option plan committee.
</TABLE>
 
                                        5
<PAGE>   9
 
               INFORMATION WITH RESPECT TO STANDING COMMITTEES OF
                      THE BOARD OF DIRECTORS AND MEETINGS
 
     The board of directors held five meetings during 1997. The board of
directors has an audit committee, a management development and compensation
committee, a stock option plan committee, an executive committee, and a
nominating committee. Actions taken by these committees are reported to the
board of directors at the next board meeting. During the last fiscal year, each
of the Company's directors attended at least 75 percent of all meetings of the
board of directors and of all committees of which they were members, except
Robert V. Gisselbeck who attended 20 percent prior to his retirement.
 
     The audit committee members are Stanley K. Hathaway, chairman, Randolph M.
Ferlic, Eugene C. Fiedorek, W. Brooks Fields (retiring) and Mary Ralph Lowe.
Also, Mr. Gisselbeck was a member of the audit committee prior to his retirement
in June 1997. The audit committee reviews with the independent accountants and
internal auditors of the Company their respective audit and review programs and
procedures, and the scope and results of their audits. It also examines
professional services provided by the Company's independent accountants and
evaluates their costs and related fees. Additionally, the audit committee
reviews the Company's financial statements and the adequacy of the Company's
system of internal accounting controls. The audit committee makes
recommendations to the board of directors concerning the Company's independent
accountants and their engagement or discharge. During the last fiscal year there
were six meetings of the audit committee.
 
     The management development and compensation committee members are Frederick
M. Bohen, chairman, A. D. Frazier, Jr., John A. Kocur, George D. Lawrence Jr.
and Joseph A. Rice. Also, Virgil B. Day was a member of the committee prior to
his retirement in May 1997. The committee reviews the Company's management
resources and structure, and administers the Company's compensation programs and
retirement, stock purchase and similar plans. The committee held six meetings
during 1997.
 
     The stock option plan committee members are Frederick M. Bohen, chairman,
A. D. Frazier, Jr. and Joseph A. Rice. The duties of the stock option plan
committee include the award and administration of option grants under the
Company's stock option plans and of conditional grants under the Company's 1996
Share Price Appreciation Plan. The committee met seven times during 1997.
 
     The executive committee members are John A. Kocur, chairman, Randolph M.
Ferlic, W. Brooks Fields (retiring), George D. Lawrence Jr., F. H. Merelli and
Raymond Plank. The executive committee is vested with the authority to exercise
the full power of the board of directors, within established policies, in the
intervals between meetings of the board of directors. In addition to the general
authority vested in it, the executive committee may be vested with specific
power and authority by resolution of the board of directors. During the last
fiscal year there were no meetings of the executive committee.
 
     The nominating committee members are John A. Kocur, chairman, Randolph M.
Ferlic, W. Brooks Fields (retiring), Mary Ralph Lowe and Raymond Plank. The
duties of the nominating committee include recommending to the board of
directors the slate of director nominees submitted to the shareholders for
election at the annual meeting, and proposing qualified candidates to fill
vacancies on the board of directors without regard to race, sex, age, religion
or physical disability. The nominating committee met twice during 1997.
 
     Shareholders wishing to recommend candidates for consideration by the
nominating committee should forward written recommendations, together with
appropriate biographical information and details of qualifications, to the
corporate secretary of the Company. In order to be considered, recommendations
must be received by the deadline for submitting shareholder proposals set forth
under the heading "Shareholder Proposals."
 
                                        6
<PAGE>   10
 
                             DIRECTOR COMPENSATION
 
     Employee directors do not receive additional compensation for serving on
the board of directors or any committee of the board. During 1997, non-employee
directors received an annual retainer of $25,000, of which $5,000 value was paid
in the form of shares of Apache common stock; plus $1,000 for each board of
directors or committee meeting attended, together with reimbursement of expenses
incurred in attending meetings. Non-employee directors receive an annual
retainer of $2,000 for each committee of which they are members. In addition,
the chairman of each committee receives $4,000 annually for chairing their
respective committees.
 
     Under the terms of the Company's non-employee directors' compensation plan
as amended in 1997, non-employee directors can elect to defer receipt of all or
any portion of their retainers or meeting attendance fees and, subject to
certain parameters, can defer such amounts in the form of cash or in the form of
shares of Apache common stock. Amounts deferred in the form of cash accrue
interest equal to the Company's rate of return on its short-term marketable
securities; amounts deferred in the form of Apache common stock accrue dividends
as if the stock was issued and outstanding when such dividends were payable. All
such deferred amounts, as well as accrued interest and dividends, are maintained
in a separate memorandum account for each participating non-employee director.
Amounts are paid out in cash and/or stock, as applicable, upon the non-employee
director's retirement or other termination of his or her directorship, or on a
specific date, in a lump sum or in annual installments over a ten-year (or
shorter) period. Two directors elected to defer a portion of their fees during
1997.
 
     An unfunded retirement plan for non-employee directors was established in
December 1992. The plan is administered by the management development and
compensation committee and pays retired non-employee directors benefits equal to
two-thirds of the annual retainer for a period based on length of service.
Payments are made on an annual basis, for a maximum of ten years, and are paid
from the general assets of the Company. In the event of the director's death
prior to receipt of all benefits payable under the plan, the remaining benefits
are payable to the director's surviving spouse or designated beneficiary until
the earlier of the termination of the payment period or the death of the
surviving spouse or designated beneficiary. Benefits were paid under this plan
to two former directors who retired from the Company's board of directors during
1997.
 
     The Company established an equity compensation plan for non-employee
directors in February 1994, which is administered by the management development
and compensation committee. Each non-employee director will be awarded 1,000
restricted shares of the Company's common stock every five years, beginning July
1, 1994. The shares vest at a rate of 200 shares annually, with unvested shares
forfeited at the time the non-employee director ceases to be a member of the
board. Awards are made from treasury stock and are automatic and
non-discretionary. New non-employee directors will receive 1,000-share awards on
the July 1 next succeeding their election to the board. All shares awarded under
the plan have full dividend and voting rights. The plan expires July 1, 2009,
with a maximum of 50,000 shares that may be awarded during the term of the plan.
On July 1, 1997, an award of 1,000 shares was made to one non-employee director
who joined the board in May 1997.
 
                                        7
<PAGE>   11
 
                    VOTING SECURITIES AND PRINCIPAL HOLDERS
 
     The following table sets forth, as of February 28, 1998, the beneficial
ownership of each director or nominee for director of the Company, the chief
executive officer, the four other most highly compensated executive officers,
and all directors and executive officers of the Company as a group. All
ownership information is based upon filings made by such persons with the
Securities and Exchange Commission (the "Commission") or upon information
provided to the Company.
 
<TABLE>
<CAPTION>
                                                                       AMOUNT AND          PERCENT OF
                                                                  NATURE OF BENEFICIAL        CLASS
 TITLE OF CLASS              NAME OF BENEFICIAL OWNER                 OWNERSHIP(1)         OUTSTANDING
 --------------              ------------------------             --------------------     -----------
<S>                <C>                                            <C>                      <C>
Common Stock, par
  value $1.25      Frederick M. Bohen...........................        4,151(2)(3)           *
                   G. Steven Farris.............................      148,803(4)(5)           *
                   Randolph M. Ferlic...........................      238,032(2)(3)(6)        *
                   Eugene C. Fiedorek...........................        4,132(2)(3)           *
                   W. Brooks Fields.............................       27,473(2)(3)(7)        *
                   A. D. Frazier, Jr. ..........................        1,348(2)(3)           *
                   Stanley K. Hathaway..........................        7,821(2)(3)           *
                   John A. Kocur................................       40,262(2)(3)(8)        *
                   George D. Lawrence Jr. ......................      219,503(2)(3)(9)        *
                   Mary Ralph Lowe..............................       32,032(2)(3)           *
                   F. H. Merelli................................        6,852(3)(5)           *
                   Raymond Plank................................      296,432(4)(5)           *
                   Joseph A. Rice...............................        5,132(2)(3)           *
                   Roger B. Plank...............................      142,433(4)(5)           *
                   Z. S. Kobiashvili............................       17,307(4)(5)           *
                   H. Craig Clark...............................       37,509(4)(5)           *
                   All directors, nominees, and executive
                   officers as a group (including the above
                   named persons)...............................    1,364,563(4)(5)           1.39
</TABLE>
 
- ---------------
 
 *  Represents less than one percent of the outstanding shares.
 
(1) All ownership is sole and direct unless otherwise noted. Inclusion of any
    shares not owned directly shall not be construed as an admission of
    beneficial ownership. Fractional shares have been rounded to the nearest
    whole share.
 
(2) Includes 1,000 shares of restricted stock awarded under the Company's equity
    compensation plan for non-employee directors.
 
(3) Includes the following shares issued for the portion of the annual retainer
    payable in stock: Mr. Merelli -- 122 shares; and each of the ten other
    non-employee directors -- 132 shares.
 
(4) Includes the following shares issuable upon the exercise of outstanding
    employee stock options which are exercisable within 60 days: Mr.
    Farris -- 75,975; Mr. Raymond Plank -- 98,700; Mr. Roger Plank -- 64,375;
    Mr. Kobiashvili -- 15,725; Mr. Clark -- 30,850; and all directors and
    executive officers as a group -- 389,550.
 
(5) Includes units held by the trustee of the Company's 401(k) Savings Plan
    equivalent to the following shares: Mr. Farris -- 16,828; Mr.
    Merelli -- 6,730; Mr. Raymond Plank -- 3,250; Mr. Roger Plank -- 13,726; Mr.
    Kobiashvili -- 1,582; Mr. Clark -- 6,659; and all directors and executive
    officers as a group -- 80,192.
 
(6) Includes 17,500 shares owned indirectly by Dr. Ferlic through his interest
    in Surgical Services of the Great Plains, P.C. Employee Benefit Trust, and
    6,000 shares owned directly by Ferlic Investments, Ltd. in which Dr. Ferlic
    owns a 36-percent interest. Also includes a total of 5,400 shares held by
    Dr. Ferlic's daughters, son and grandchildren, as to which he disclaims
    beneficial ownership.
 
(7) Includes 10,868 shares owned by Mrs. Fields.
 
(8) Includes 3,940 shares owned by Mrs. Kocur.
 
(9) Includes 185,625 shares issuable upon the exercise of outstanding stock
    options which are fully exercisable. See "Certain Business Relationships and
    Transactions".
 
                                        8
<PAGE>   12
 
     The following table sets forth the only persons known to the Company, as of
February 28, 1998, to be the owners of more than five percent of outstanding
shares of the Company's common stock, according to reports filed with the
Commission:
 
<TABLE>
<CAPTION>
                                                                   AMOUNT AND
                                                                     NATURE              PERCENT OF
                                                                  OF BENEFICIAL             CLASS
 TITLE OF CLASS        NAME AND ADDRESS OF BENEFICIAL OWNER         OWNERSHIP            OUTSTANDING
 --------------        ------------------------------------       -------------          -----------
<S>                <C>                                            <C>                    <C>
Common Stock, par
  value $1.25      The Equitable Companies Incorporated.........   10,461,016(1)            10.63
                   1290 Avenue of the Americas
                   New York, New York 10104
 
                   Princeton Services, Inc. ....................    8,638,026(2)             8.78
                   Merrill Lynch Asset Management, L.P.
                   800 Scudders Mill Road
                   Plainsboro, New Jersey 08536
 
                   College Retirement Equities Fund.............    5,890,288(3)             5.99
                   730 Third Avenue
                   New York, New York 10017
</TABLE>
 
- ---------------
 
(1) Per Schedule 13G filed with the Commission, dated February 10, 1998.
 
(2) Per Schedule 13G filed with the Commission, dated January 28, 1998.
 
(3) Per Schedule 13G filed with the Commission, dated February 2, 1998.
 
            SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
     Section 16(a) of the Securities Exchange Act of 1934, as amended, requires
the Company's directors and officers, as well as beneficial owners of ten
percent or more of the Company's common stock, to report their holdings and
transactions in the Company's securities. To the Company's knowledge, based on
information furnished to it and contained in reports provided pursuant to
Section 16(a), as well as written representations that no other reports were
required for 1997, it appears that Mr. Bohen and Mr. Frazier, directors of the
Company, each filed one late report relating to small purchases of shares made
with additional cash investments through the Company's dividend reinvestment
plan.
 
                                        9
<PAGE>   13
 
                       EXECUTIVE OFFICERS OF THE COMPANY
 
     Certain biographical information concerning the executive officers of the
Company is set forth below. Biographical information concerning Raymond Plank
and G. Steven Farris is set forth above under the captions "Information about
Nominees for Election as Directors" and "Information about Continuing
Directors."
 
MICHAEL S. BAHORICH, 41, was appointed vice president--exploration technology in
December 1997, having been the Company's chief geophysicist since 1996. From
1981 until he joined the Company, Mr. Bahorich held positions of increasing
responsibility at Amoco Corporation in Denver, Colorado and Tulsa, Oklahoma,
most recently as a resource manager for Amoco's mid-continent business unit.
 
H. CRAIG CLARK, 41, a vice president of the Company, has been on assignment
since October 1997, serving as chairman and chief executive officer of Producers
Energy Marketing, LLC (also known as ProEnergy), the joint-venture natural gas
marketing company in which the Company held an approximate 48-percent interest
as of year-end 1997. He became a vice president of the Company in 1994, with
responsibility for North American production from 1994 to 1996, and for North
American exploration and production from May 1996 through September 1997. Mr.
Clark was general manager of the Company's southern division from 1993 to 1994,
and production manager of the Company's Gulf Coast region from 1989 to 1993.
 
MATTHEW W. DUNDREA, 44, was appointed vice president and treasurer in July 1997,
having been the Company's treasurer since March 1996 and assistant treasurer
since 1994. Prior to that, he was assistant treasurer from 1991 to 1994,
manager--cash management from 1986 to 1991, and manager--economic analysis from
1984 to 1986, for Union Texas Petroleum Holdings, Inc., Houston, Texas.
 
ROBERT J. DYE, 43, was appointed vice president--investor relations in May 1997,
having been director of investor relations since 1995. Prior to that, Mr. Dye
held positions of increasing responsibility in the corporate planning area since
joining the Company in 1992. Formerly, he was planning manager for the offshore
division of BP Exploration, Houston, Texas, from 1988 to 1992.
 
LISA A. FLOYD, 40, has been vice president--business development since September
1997, having been vice president--technical services since January 1995, and
general manager--technical services since 1994. Ms. Floyd has held positions of
increasing responsibility in the reservoir engineering area since joining the
Company in 1984.
 
ZURAB S. KOBIASHVILI, 55, has been vice president and general counsel of the
Company since 1994. From 1991 through 1994, he was with Falcon Seaboard
Resources, Inc., a privately-held company involved in the development,
construction and operation of electric cogeneration power plants, and in oil and
gas exploration and production, initially as a legal consultant and from 1993 as
vice president and general counsel. Mr. Kobiashvili was vice president and
general counsel for Conquest Exploration Company, Houston, Texas, from 1984 to
1991.
 
ANTHONY R. LENTINI, JR., 48, has been vice president--public and international
affairs since January 1995. Prior to joining the Company, he was vice president
of public affairs for Mitchell Energy & Development Corp., The Woodlands, Texas,
from 1988 through 1994.
 
THOMAS L. MITCHELL, 37, was appointed vice president and controller in July
1997, having been the Company's controller and chief accounting officer since
February 1996. He held various positions in the Company's natural gas marketing
operation from 1990 through 1995, and served as accounting manager for the
Company's Gulf Coast operations from 1989 to 1990. Prior to joining the Company,
Mr. Mitchell was a manager with Arthur Andersen & Co., an independent public
accounting firm, from 1982 through 1988.
 
                                       10
<PAGE>   14
 
ROGER B. PLANK, 41, was appointed vice president and chief financial officer in
July 1997, having been vice president--planning and corporate development since
March 1996 and vice president--corporate planning since 1994. Prior to that, he
was the Company's vice president--external affairs from 1993 to 1994, vice
president--corporate communications from 1987 to 1993, and director--corporate
communications from 1985 to 1987. Roger Plank is the son of Raymond Plank.
 
FLOYD R. PRICE, 48, has been vice president--international exploration and
production since December 1994. He served as exploration manager from 1991 to
1994, and geologic manager from 1990 to 1991, for the Company's mid-continent
region. Prior to that, Mr. Price was vice president of exploration and
development from 1988 to 1989, and vice president of mid-continent exploration
from 1989 to 1990, for Pacific Enterprises Oil Company, Dallas, Texas.
 
DANIEL L. SCHAEFFER, 48, was appointed vice president--human resources in July
1997, having been director of human resources since 1990. He was director of
training and organizational development for the Company from 1987 to 1990.
 
CHERI L. PEPER, 44, was appointed corporate secretary of the Company in May
1995, having been assistant secretary since 1992. Prior to joining the Company,
she was assistant secretary for Panhandle Eastern Corporation (subsequently
PanEnergy Corp.) since 1988.
 
                                       11
<PAGE>   15
 
                           SUMMARY COMPENSATION TABLE
 
     The table below summarizes the annual and long-term compensation paid to
the individuals listed below for all services rendered to the Company and its
subsidiaries during the last three fiscal years, in accordance with Commission
rules relating to disclosure of executive compensation. The persons included in
this table are the Company's chief executive officer and the four other most
highly compensated executive officers who were serving as executive officers of
the Company at year-end 1997.
 
<TABLE>
<CAPTION>
                                                                                  LONG-TERM
                                                                                COMPENSATION
                                                  ANNUAL COMPENSATION          ---------------
                                            --------------------------------       AWARDS
                                                                   OTHER       ---------------
                                                                   ANNUAL        SECURITIES       ALL OTHER
                                            SALARY     BONUS    COMPENSATION     UNDERLYING      COMPENSATION
    NAME AND PRINCIPAL POSITION      YEAR     ($)     ($)(1)        ($)        OPTIONS/SARS(#)       ($)
    ---------------------------      ----   -------   -------   ------------   ---------------   ------------
<S>                                  <C>    <C>       <C>       <C>            <C>               <C>
Raymond Plank......................  1997   750,000   374,900          0           24,900(2)       138,708(4)
  Chairman of the Board and          1996   750,000   405,900          0           44,800(2)       112,464(3)
  Chief Executive Officer            1995   650,016   187,200          0           40,000(2)       120,422(3)
 
G. Steven Farris...................  1997   491,680   245,700      4,752(6)        16,600(2)        99,606(4)(5)
  President and Chief Operating      1996   450,000   243,500          0           26,900(2)        66,096(3)
  Officer                            1995   350,016   100,800          0           21,000(2)        61,274(3)
 
Roger B. Plank.....................  1997   226,670   113,300        902(6)        32,000(2)        42,490(4)(5)
  Vice President and                 1996   203,750   109,400          0           26,900(2)        32,646(3)
  Chief Financial Officer            1995   182,500    68,300          0            7,500(2)        33,540(3)
 
Z. S. Kobiashvili..................  1997   218,333   107,800      5,340(6)         7,000(2)        52,132(4)(5)
  Vice President and                 1996   205,000   109,500          0            6,900(2)        33,288(3)
  General Counsel                    1995   193,333    72,400          0            8,000(2)        33,820(3)
 
H. Craig Clark(7)..................  1997   213,333   107,000      1,234(6)         7,100(2)        42,957(4)(5)
  Vice President                     1996   195,000   120,000          0           26,400(2)        38,400(3)
                                     1995   182,500   125,000          0            8,500(2)        35,100(3)
</TABLE>
 
- ---------------
 
(1) Includes amounts awarded under the Company's incentive compensation plan for
    performance in the year indicated.
 
(2) Shares of the Company's common stock subject to options awarded during 1997,
    1996 and 1995. Such stock options were granted on July 17, 1997, May 1,
    1997, July 11, 1996, April 22, 1996, March 26, 1996 and August 23, 1995
    under the terms of the 1995 Stock Option Plan (the "1995 Plan"). There were
    no adjustments or amendments during the last fiscal year to the exercise
    price of stock options previously granted to any of the named executive
    officers.
 
(3) Represents Company contributions under the Company's Retirement/401(k)
    Savings Plan and related Non-Qualified Retirement/Savings Plan.
 
(4) Includes Company contributions under the Company's 401(k) Savings Plan, the
    Company's Money Purchase Retirement Plan, and related Non-Qualified
    Retirement/Savings Plan in the following amounts: Mr. Raymond
    Plank -- $138,708; Mr. Farris -- $88,222; Mr. Roger Plank -- $40,329; Mr.
    Kobiashvili -- $39,340; and Mr. Clark -- $40,000.
 
(5) Includes premium for executive life insurance benefits in the following
    amounts: Mr. Farris -- $11,384; Mr. Roger Plank -- $2,161; Mr.
    Kobiashvili -- $12,792; and Mr. Clark -- $2,957.
 
(6) Amounts reimbursed for the payment of taxes relating to executive life
    insurance benefits.
 
(7) Mr. Clark has been on assignment since October 1997, serving as chairman and
    chief executive officer of ProEnergy. See "Executive Officers of the
    Company" above.
 
                                       12
<PAGE>   16
 
                            OPTION/SAR GRANTS TABLE
 
     The table below provides supplemental information relating to the Company's
grants of options during 1997 to the executive officers named in the Summary
Compensation Table above, including the relative size of each grant, and each
grant's exercise price and expiration date. There were no stock appreciation
rights ("SARs") granted during the last fiscal year. Also included, in
compliance with Commission rules on disclosure of executive compensation, is
information relating to the estimated present value of the options granted,
based upon principles of the Black-Scholes option pricing model. The
Black-Scholes model utilizes numerous arbitrary assumptions about financial
variables such as interest rates, stock price volatility and future dividend
yield. Neither the option values reflected in the table nor the assumptions
utilized in arriving at the values should be considered indicative of future
stock performance.
 
                     OPTION/SAR GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                INDIVIDUAL GRANTS
                             -------------------------------------------------------
                              NUMBERS OF      PERCENT OF
                              SECURITIES        TOTAL
                              UNDERLYING     OPTIONS/SARS    EXERCISE
                             OPTIONS/SARS     GRANTED TO      OR BASE                   GRANT DATE
                               GRANTED       EMPLOYEES IN      PRICE      EXPIRATION      PRESENT
           NAME               (#)(1)(2)      FISCAL YEAR     ($/SH)(3)       DATE       VALUE($)(4)
           ----              ------------    ------------    ---------    ----------    -----------
<S>                          <C>             <C>             <C>          <C>           <C>
Raymond Plank..............    24,900/0         2.03/0        33.125      05/01/2007      306,768
G. Steven Farris...........    16,600/0         1.35/0        33.125      05/01/2007      204,512
Roger B. Plank.............     7,000/0         0.57/0        33.125      05/01/2007       86,240
                               25,000/0         2.04/0        34.125      07/17/2007      306,500
Z. S. Kobiashvili..........     7,000/0         0.57/0        33.125      05/01/2007       86,240
H. Craig Clark.............     7,100/0         0.58/0        33.125      05/01/2007       87,472
</TABLE>
 
- ---------------
 
(1) This column sets forth the number of shares of the Company's common stock
    subject to options granted May 1, 1997 and July 17, 1997, under the terms of
    the 1995 Plan. Options are generally nontransferable and become exercisable
    ratably over four years. The options were granted for a term of ten years,
    subject to earlier termination in certain events related to termination of
    employment, and are not intended to qualify as incentive stock options under
    Section 422 of the Internal Revenue Code. The exercise price and any
    withholding tax requirements may be paid by cash and/or delivery of
    already-owned shares of the Company's common stock. Options granted under
    the 1995 Plan are subject to appropriate adjustment in the event of a
    reorganization, stock split, stock dividend, combination of shares, merger,
    consolidation or other recapitalization of the Company. If there is a change
    in control of the Company, the stock option plan committee may accelerate
    the exercise date of any outstanding options; make any outstanding options
    fully vested and exercisable; grant a cash bonus award to any participant in
    an amount necessary to pay the exercise price of all or any portion of the
    options then held by the participant; pay cash to any or all participants
    (in exchange for the cancellation of their outstanding options) in an amount
    equal to the difference between the exercise price of the options and the
    greater of the tender offer price for the underlying stock or the fair
    market value of the stock on the date of the cancellations, or make any
    other adjustments or amendments to the outstanding options.
 
     A change in control occurs when a person, partnership or corporation acting
     in concert, or any or all of them, acquires more than 20 percent of the
     Company's outstanding voting securities. A change in control shall not
     occur if, prior to the acquisition of more than 20 percent of the Company's
     voting securities, the Company's board of directors by majority vote
     designates the person, partnership or corporation as an approved acquirer
     and resolves that a change in control will not have occurred.
 
(2)  There were no SARs granted during 1997. There were no adjustments or
     amendments during 1997 to the exercise price of stock options previously
     granted to any of the named executive officers.
 
                                         (footnotes continued on following page)
                                       13
<PAGE>   17
 
(3)  The exercise price is the closing price per share of the Company's common
     stock on the date of grant, as reported on The New York Stock Exchange,
     Inc. Composite Transactions Reporting System.
 
(4)  The grant date present value is based on the Black-Scholes option pricing
     model adapted for use in valuing executive stock options, using the
     following assumptions for the grants made May 1, 1997 and July 17, 1997,
     respectively: volatility -- 32.19 and 31.34 percent; risk free rate of
     return -- 6.53 and 6.10 percent; dividend yield -- 0.85 and 0.82 percent;
     and expected option life -- five years. There were no adjustments made to
     the model for non-transferability or risk of forfeiture. The actual value,
     if any, an executive may realize will depend on the excess of the market
     price over the exercise price on the date the option is exercised. There is
     no assurance the value realized by an executive will be at or near the
     value estimated by the Black-Scholes model.
 

                                       14
<PAGE>   18
 
                 OPTION/SAR EXERCISES AND YEAR-END VALUE TABLE
 
     The table below provides supplemental information relating to the value
realized upon the exercise of stock options during the last fiscal year by the
executive officers named in the Summary Compensation Table above and the number
and intrinsic value of stock options held at year-end. Year-end values are based
arbitrarily on the closing price of the Company's common stock for December 31,
1997, do not reflect the actual amounts, if any, which may be realized upon the
future exercise of remaining stock options, and should not be considered
indicative of future stock performance.
 
              AGGREGATED OPTION/SAR EXERCISES IN LAST FISCAL YEAR
                     AND FISCAL YEAR-END OPTION/SAR VALUES
 
<TABLE>
<CAPTION>
                                                                       NUMBER OF           VALUE OF
                                                                       SECURITIES         UNEXERCISED
                                                                       UNDERLYING        IN-THE-MONEY
                                                                      UNEXERCISED        OPTIONS/SARS
                                                                      OPTIONS/SARS         AT FY-END
                                                                    AT FY-END(#)(3)     ---------------
                               SHARES ACQUIRED                      ----------------     EXERCISABLE/
                                 ON EXERCISE      VALUE REALIZED      EXERCISABLE/       UNEXERCISABLE
            NAME                   (#)(1)             ($)(2)         UNEXERCISABLE         ($)(3)(4)
            ----               ---------------    --------------    ----------------    ---------------
<S>                            <C>                <C>               <C>                 <C>
Raymond Plank................         0                 0            98,700/86,000      732,056/301,600
G. Steven Farris.............         0                 0            75,975/63,525      572,692/268,677
Roger B. Plank...............         0                 0            59,375/57,725      859,311/208,408
Z. S. Kobiashvili............         0                 0            13,225/18,675      108,552/ 75,468
H. Craig Clark...............         0                 0            25,850/32,900      250,934/166,700
</TABLE>
 
- ---------------
 
(1)  Number of shares with respect to which stock options were exercised during
     1997.
 
(2)  Fair market value on date of exercise minus the exercise price of stock
     options.
 
(3)  There were no SARs settled or outstanding at any time during the last
     fiscal year for any of the named executive officers.
 
(4)  Based on the closing price of $35.0625 per share of the Company's common
     stock as reported on The New York Stock Exchange, Inc. Composite
     Transactions Reporting System for December 31, 1997.
 
                                       15
<PAGE>   19
 
             THE MANAGEMENT DEVELOPMENT AND COMPENSATION COMMITTEE
                        REPORT ON EXECUTIVE COMPENSATION
 
     This report is issued by the management development and compensation
committee of the board of directors to set out the executive compensation
policies and programs of the Company.
 
     The objective of the Company's executive compensation program is to attract
and retain executives capable of leading the Company in a complex, competitive
and changing industry. A capable, highly-motivated senior management is an
integral part of the Company's continued success. The Company's financial
performance is in large part due to the talent and efforts of the Company's
executive officers. The program ties a significant portion of executive
compensation to the Company's success, and is primarily comprised of a base
salary, an incentive bonus, and a long-term incentive component.
 
BASE SALARY
 
     The committee believes that the most effective way to compete in the
executive labor market is to offer executives a competitive base salary. To
achieve this balance, the committee analyzes each executive's compensation using
a four-step process. First, the key executive positions within the Company are
defined carefully in terms of scope and responsibility, job complexity,
knowledge and experience required, and other relevant factors. Second, the
positions are ranked internally on the basis of these definitions to establish a
logical relationship among them. Third, the committee identifies the Company's
direct competitors which it believes share comparable operations, employee
composition, and capitalization, and obtains comparative compensation data about
the identified companies from independent, national executive compensation
consultants with expertise in salary and incentive plan structure. Finally,
easily-compared positions are priced in terms of salary ranges by reviewing the
comparative industry data and other surveys, to establish relative salary ranges
for all key executive positions in the Company. Base salaries are targeted to
fall within the 50th to 75th percentiles of executive salaries paid by
comparable companies, and for 1997 they generally correspond to that range. The
committee sets each executive's salary within this range, taking into account
the individual's contribution to the Company's success, how well the
individual's responsibilities are fulfilled, the individual's specific
performance, growth in qualifications for the individual's job, and other
relevant aspects of performance.
 
     Base salaries of all executives are generally reviewed every 12 to 24
months. Salary adjustments are made within updated, market-confirmed salary
ranges according to the committee's assessment of the executive's individual
performance and the performance of the Company as a whole. However, changes in
the circumstances of a particular executive can prompt an interim compensation
adjustment. In 1995, the committee retained the services of an outside
compensation consultant, who was proposed by management and approved by the
committee, to review the base salaries of the Company's executives and confirm
that the salaries correspond to the 50th to 75th percentile target ranges of
comparable companies. Such review included comparative data from part but not
all of the companies comprising the Secondary Oils Index reflected in the stock
performance chart set forth below, as some of those companies have integrated
operations or operate in diversified industries. The committee intends to retain
a consultant during 1998 to update this executive compensation data.
 
     Based on the factors discussed above and taking into consideration the
outside consultant's October 1995 report on their review, plus additional
compensation data available to the Company from other sources, eleven of the
Company's officers received increases in compensation during 1997 to reflect
market changes and increased responsibilities resulting from internal corporate
restructuring. Each of the executives named in the Summary Compensation Table,
except Raymond Plank, received an increase in base salary during 1997.
 
                                       16
<PAGE>   20
 
INCENTIVE BONUS
 
     Executives are eligible to receive an annual incentive bonus tied directly
to the Company's annual financial performance and achievement of the executive's
personal objectives. In the early months of each year, the committee establishes
specific annual corporate performance factors, and the executive officers submit
personal goals relating to cost reduction, operational improvements or other
objectively determinable goals. Personal goals must be approved by the
executive's superior and the corporate performance factors are approved by both
the committee and the full board of directors. In 1997, 75 percent of each
executive's bonus depended upon the Company's achievement of the specified
corporate performance factors, with intermediate factors ranging from zero if
the minimum factors established were not met, to 125 percent if the maximum
performance factors were achieved. The remaining 25 percent of each executive's
bonus depended upon the percentage of the executive's personal goals which were
successfully accomplished, as well as the Company's achievement of the corporate
performance factors. The Company's incentive compensation plans effectively
correlate a large portion of executive compensation to predetermined,
objectively determinable financial and managerial goals designed to translate
into shareholder value. Committee policy provides for bonuses targeted at 50
percent of each executive's base salary, subject to corporate performance.
 
     Executive bonuses paid in 1998 were based on management's achievement
during 1997 of the corporate performance factors established by the committee
relating to earnings per share, cash flow per share and other
performance-related measures. The committee set the performance factors for an
achievement level of 100 percent as follows: $1.68 per share for earnings per
share; $6.53 per share for cash flow per share; and reserves and production per
barrel of oil equivalent ("boe") of 6.27 and .70 per share, respectively. The
Company reported earnings of $1.71 per share, cash flow of $6.74 per share,
reserves at year-end 1997 of 6.28 boe per share, and production for 1997 of .69
boe per share. Management's achievement of these corporate performance factors
during the year represented attainment of 99.96 percent of the corporate
performance factors.
 
     In addition to the Company's regular incentive compensation plan, the
committee may elect to award a special achievement bonus to an executive officer
who has rendered services during the year that substantially exceed those
normally required. Special achievement bonuses reflect the committee's decision
to reward any executive who, through extraordinary effort, has substantially
benefited the Company and its shareholders during the year. The bonuses are
awarded only in exceptional circumstances and are in amounts relative to the
benefit provided to the Company. No special achievement bonuses were awarded or
paid during 1997 to any of the Company's executive officers.
 
LONG-TERM INCENTIVE
 
     Long-term incentives in forms relating to the Company's common stock serve
to align the interests of executive officers with the Company's shareholders by
tying a significant portion of each executive's total long-term compensation to
the continued growth of the Company and appreciation of its common stock. In
1997, the Company's executive officers received stock option grants under the
Company's 1995 Stock Option Plan. The grants of stock options made in 1997 to
the Company's officers named in the Summary Compensation Table presented above
are reflected in the Option/SAR Grants Table. In May 1997, the Company's
shareholders approved the 1996 Share Price Appreciation Plan (the "Appreciation
Plan"), under which conditional grants were made to the Company's executive
officers in October 1996.
 
     Stock options and conditional grants awarded to executives are
proportionate to each officer's base salary and benefit them only if
shareholders also benefit from appreciating stock prices. Individual stock
option grants are targeted at the 50th percentile of similar plans maintained by
comparable companies, taking into account options previously granted, vest over
four years, and have an exercise price equal to the per share closing price of
the Company's common stock on the date of grant. The conditional grants made in
October 1996 under the Appreciation Plan are intended to provide specific
individual incentives to focus on achieving significant share price appreciation
for the balance of the decade. Benefits are payable under the conditional grants
only if the Company's common stock attains price goals based on $50 and $60 per
share, respectively, prior to January 1, 2000.
 
                                       17
<PAGE>   21
 
CHIEF EXECUTIVE OFFICER
 
     Raymond Plank, the Company's chief executive officer, directs Apache's
intensive, on-going programs to monitor, analyze and respond creatively to the
changes and new requirements in the oil and gas industry. His activities include
leadership in implementing the Company's capital expenditure programs, and
maintenance of sound business relationships with the management of many of the
nation's large oil and gas companies. These relationships are important to
Apache's strategic alliances and the Company's acquisition approach, which
emphasizes privately negotiated transactions that develop and achieve mutual
business benefits. Mr. Plank has also been responsible for the Company's
developing interest and successful exploration efforts going forward in
international areas such as Egypt, Australia, Poland and China. As an active
chief executive, he oversees all of the Company's major business units and
guides and develops Apache's senior management. Reporting directly to Mr. Plank
are the president, the vice president and chief financial officer, and the vice
president and general counsel.
 
     Mr. Plank's base salary, incentive bonus and long-term incentives are
determined in the same manner as is the compensation for the Company's other
executive officers and are reflected in the Summary Compensation Table above.
His last base salary adjustment was effective January 1, 1996; and his bonus
paid in 1998 was based on the Company's 1997 performance, as discussed above.
Mr. Plank, as the Company's most senior executive officer, prepares his personal
goals with the consultation of the committee, and periodically reports to the
committee on his progress toward the achievement of those goals. Mr. Plank's
employment agreement prohibits the reduction of his salary below a specified
amount. See "Employment Contracts and Termination of Employment and
Change-in-Control Arrangements."
 
     Mr. Plank's 1997 base salary was within the committee's percentile targets
and took into account the following: Mr. Plank's active role in the Company's
management and leadership of successful acquisitions; the Company's financial
performance during 1996; the challenges and expectations for the Company in
1997; Mr. Plank's recognized stature as a spokesman for the oil and gas
industry; and his role as a Company founder and 43 years of service as the
Company's senior executive officer. Mr. Plank's bonus paid in 1998 represented
99.96 percent of his eligible bonus amount under the incentive compensation
plan, reflecting the Company's overall achievement of 99.96 percent of corporate
performance factors for 1997 and the achievement of 100 percent of his personal
goals.
 
OMNIBUS BUDGET RECONCILIATION ACT OF 1993
 
     The Omnibus Budget Reconciliation Act of 1993 ("OBRA") imposes a limit,
with certain exceptions, on the amount that a publicly held corporation may
deduct in any tax year commencing on or after January 1, 1994, for the
compensation paid or accrued with respect to its chief executive officer and its
four most highly compensated executive officers (other than the chief executive
officer). In December 1995, the Internal Revenue Service issued final
regulations implementing the legislation, with the regulations effective as of
January 1, 1994. Certain performance-based compensation is specifically exempt
from the limit if it meets the requirements contained in these final
regulations. The committee continues to review the Company's compensation plans
based upon these regulations and, from time to time, determines what further
actions or changes to the Company's compensation plans, if any, are appropriate.
The Company anticipates no significant loss of deductibility attributable to
compensation paid or accrued in 1997.
 
     Grants of stock options made under the Company's 1990 Stock Incentive Plan
or 1995 Stock Option Plan qualify as "performance-based" under the regulations.
Conditional awards made under the Appreciation Plan also qualify as
performance-based. The Company's existing incentive compensation plans and
special achievement bonuses do not currently meet the requirements of the
regulations, although they are designed to reward the contribution and
performance of employees and to provide a meaningful incentive for achieving the
Company's goals, which in turn enhances shareholder value. While the committee
cannot predict with certainty how the Company's compensation policies may be
further impacted by OBRA, it is anticipated that executive compensation paid or
accrued pursuant to any of the Company's compensation plans which do not meet
the requirements of the regulations will not result in any significant loss of
tax deductions in the foreseeable future.
 
                                       18
<PAGE>   22
 
SUMMARY
 
     According to information provided to the committee in October 1995 by its
independent compensation consultant, the amount of the Company's cash
compensation paid to all of its executive officers during 1997 was in
approximately the 70th percentile of all comparable companies. As shown on the
Performance Graph following this report, the shareholders have enjoyed a
rewarding cumulative annual return with the Company's common stock outperforming
the Dow Jones Secondary Oil Stock Index over the last five years, and
outperforming or substantially equaling the Standard & Poor's Composite 500
Stock Index over four of the last five years. These are visible measures of
management's enhancement of shareholder value. Viewed in light of the Company's
performance, the committee believes that its current executive compensation
policy is successful in providing shareholders with talented, dedicated
executives at competitive compensation levels.
 
March 17, 1998                              Management Development and
                                              Compensation Committee
 
                                            Frederick M. Bohen
                                            A. D. Frazier, Jr.
                                            John A. Kocur
                                            George D. Lawrence Jr.
                                            Joseph A. Rice
 
                                       19
<PAGE>   23
 
                               PERFORMANCE GRAPH
 
     The following stock price performance graph is included in accordance with
the Commission's executive compensation disclosure rules and is intended to
allow shareholders to review the Company's executive compensation policies in
light of corresponding shareholder returns, expressed in terms of the
appreciation of the Company's common stock relative to two broad-based stock
performance indices. The information is included for historical comparative
purposes only and should not be considered indicative of future stock
performance. The graph compares the yearly percentage change in the cumulative
total shareholder return on the Company's common stock with the cumulative total
return of the Standard & Poor's Composite 500 Stock Index and of the Dow Jones
Secondary Oils Stock Index from December 31, 1992 through December 31, 1997.
 
                COMPARISON OF FIVE YEAR CUMULATIVE TOTAL RETURN
                      FOR THE YEAR ENDED DECEMBER 31, 1997
 
<TABLE>
<S>                                <C>              <C>             <C>             
                                                       S & P'S       DJ SECONDARY
                                        APACHE       COMPOSITE 500    OILS STOCK 
YEAR ENDED DECEMBER 31,               CORPORATION     STOCK INDEX       INDEX
1992                                     100             100             100
1993                                     126             110             111
1994                                     136             112             107
1995                                     162             153             124
1996                                     195             189             153
1997                                     196             252             163
</TABLE>
 
                                       20
<PAGE>   24
 
                    EMPLOYMENT CONTRACTS AND TERMINATION OF
                 EMPLOYMENT AND CHANGE-IN-CONTROL ARRANGEMENTS
 
     Mr. Raymond Plank serves the Company under an employment agreement entered
into in December 1975, amended and restated in December 1990, and amended in
April 1996. The agreement has an undefined term and is terminable at will by the
Company's board of directors. Mr. Plank's annual compensation under the
agreement is determined by the board of directors, but may not be less than
$450,000. If his service as director and chief executive officer is terminated
by the board of directors, Mr. Plank will serve as advisor and consultant to the
Company for the remainder of his life at annual compensation equal to 50 percent
of his then-current annual compensation and will receive health, dental and
vision benefits for himself, his spouse and his eligible dependents during the
remainder of his life. Pursuant to the agreement, and in exchange for
surrendering life insurance coverage, an annuity was purchased for Mr. Plank
which pays $31,500 annually until 2008. Mr. Plank has agreed not to render
service to any of the Company's competitors for the entire period covered by the
agreement. Upon Mr. Plank's death, a total of $750,000 shall be paid to (i) his
designee in equal monthly installments over ten years, or (ii) if he has made no
designation, in a lump sum to his estate.
 
     Mr. Farris serves the Company pursuant to an employment agreement, dated
June 6, 1988, under which he receives a current annual salary of $500,000. The
agreement has an undefined term and may be terminated by either the Company or
Mr. Farris on 30 days advance written notice. If Mr. Farris' employment is
terminated without cause, or if he terminates his employment within 30 days of a
reduction in his salary without a proportionate reduction in the salaries of all
other Company executives, Mr. Farris will receive, for 36 months thereafter, (i)
an amount equal to his base salary as it existed 60 days prior to termination
and (ii) 50 percent of the maximum amount for which he qualified under the
Company's incentive compensation plan, calculated on his base compensation as it
existed 60 days prior to termination. In the event of Mr. Farris' death during
the 36-month period, the amounts described above shall be paid to his heirs or
estate. Mr. Farris has agreed not to render service to any of the Company's
competitors for the term of his employment or, unless he is terminated without
cause, for 36 months thereafter.
 
     In addition to the foregoing, the Company has established an income
continuance plan. The plan provides that all officers of the Company, including
the officers named in the Summary Compensation Table, and all employees who have
either reached the age of 40, served the Company for more than ten years, or
have been designated for participation based upon special skills or experience,
will receive monthly payments approximating their monthly income and continued
medical and health benefits from the Company for up to two years, if their
employment is terminated as a result of a "change in control" of the Company, as
defined in the plan.
 
                       COMPENSATION COMMITTEE INTERLOCKS
                           AND INSIDER PARTICIPATION
 
     Frederick M. Bohen, John A. Kocur and Joseph A. Rice served on the
management development and compensation committee of the Company's board of
directors for all of 1997. Virgil B. Day served on the committee until his
retirement from the board in May 1997, and A. D. Frazier, Jr. and George D.
Lawrence Jr. were each appointed to the committee in May 1997.
 
     Mr. Kocur, a member of the committee since September 1991 and a director of
the Company since 1977, retired as an executive officer in June 1991. Pursuant
to the terms of an employment agreement in place at the time of his retirement,
Mr. Kocur and his spouse receive health, dental and vision benefits throughout
his life.
 
     Mr. Lawrence, a member of the committee since May 1997 and a director of
the Company since May 1996, is the former president and chief executive officer
of The Phoenix Resource Companies, Inc. ("Phoenix"), a wholly-owned subsidiary
of the Company. See "Certain Business Relationships and Transactions." Pursuant
to the terms of his employment agreement with Phoenix, Mr. Lawrence received
medical and dental benefits through December 1997.
 
                                       21
<PAGE>   25
 
                CERTAIN BUSINESS RELATIONSHIPS AND TRANSACTIONS
 
     The law firm of Vedder, Price, Kaufman, Kammholz & Day ("Vedder, Price")
was retained by the Company to provide certain legal services and was paid
approximately $66,000 by the Company during 1997. Virgil B. Day, a member of the
Company's board of directors until May 1997, was a senior partner of Vedder,
Price through June 1997.
 
     George D. Lawrence Jr., a member of the Company's board of directors and
the former president and chief executive officer of Phoenix, joined Apache's
board in conjunction with the Company's acquisition of Phoenix by a merger (the
"Merger") on May 20, 1996, through which Phoenix became a wholly-owned
subsidiary of Apache. Merger consideration totaled $396.3 million, consisting of
approximately 12,190,000 shares of the Company's common stock valued at $26.00
per share, $14.9 million of net value associated with Phoenix stock options
assumed by Apache, and $64.5 million in cash.
 
     Upon consummation of the Merger, Apache assumed certain Phoenix stock
options that remained outstanding on May 20, 1996, including those granted to
Mr. Lawrence pursuant to Phoenix's 1990 Employee Stock Option Plan. As of
February 28, 1998, there are options outstanding and exercisable by Mr. Lawrence
covering a total of 185,625 shares of Apache common stock at prices ranging from
$3.46 to $24.83 per share.
 
     In the normal course of business, Apache paid to Maralo, Inc. ("Maralo")
during 1997 approximately $694,800 for Apache's proportionate share of drilling
and workover costs and routine expenses relating to nine oil and gas wells in
which Apache owns interests and for which Maralo is operator, and the Company
received approximately $482,000 in 1997 for its proportionate share of revenues
from such wells, of which approximately $105,000 was paid directly to Apache by
Maralo or related entities. During 1997, Apache paid approximately $7,500 to
Maralo relating to seven oil and gas wells in which Maralo owns royalty
interests and for which the Company is operator. Mary Ralph Lowe, a member of
the Company's board of directors, is president, chief executive officer and sole
shareholder of Maralo.
 
     In the normal course of business, Key Production Company, Inc. ("Key") paid
to Apache during 1997 approximately $6.5 million for Key's proportionate share
of drilling and workover costs and routine expenses relating to 360 oil and gas
wells in which Key owns interests and for which Apache is the operator. Key
received approximately $14.3 million in 1997 for its proportionate share of
revenues from such interests, of which approximately $6.1 million was paid
directly to Key by Apache or related entities. F. H. Merelli, a member of the
Company's board of directors since July 1997, is chairman of the board,
president and chief executive officer of Key.
 
     As noted above under "Executive Officers of the Company," Mr. Clark was
assigned to ProEnergy in October 1997, as chairman and chief executive officer.
In October 1995, wholly-owned affiliates of each of the Company, Oryx Energy
Company and Parker & Parsley Petroleum Company formed ProEnergy, a natural gas
marketing company designed to sell producer-owned gas directly into the
marketplace. ProEnergy purchases and markets substantially all of the Company's
domestic natural gas production, pursuant to a gas purchase agreement dated
March 1, 1996, having an initial term of ten years, subject to earlier
termination following specified events.
 
                                       22
<PAGE>   26
 
                                  APPROVAL OF
                           THE 1998 STOCK OPTION PLAN
 
                         (PROPOSAL NO. 2 ON PROXY CARD)
 
     The board of directors recommends that the shareholders of the Company vote
FOR the proposal to approve the 1998 Stock Option Plan (the "1998 Plan"). The
affirmative vote of the holders of a majority of the shares of the Company's
common stock voted, in person or by proxy, and entitled to vote at the annual
meeting is required to approve the 1998 Plan.
 
     The 1998 Plan was adopted by the board of directors on February 6, 1998,
subject to approval by shareholders at the next annual meeting. Shareholder
approval of the 1998 Plan is necessary to allow the stock option plan committee
of the board of directors (the "Committee") continued flexibility to use stock
options in the Company's overall compensation program, as the number of shares
of the Company's common stock remaining available for the grant of stock options
under the existing 1995 Stock Option Plan will not be adequate to meet the
Company's expected needs beyond mid-1998.
 
     The 1998 Plan provides for the grant of stock options to eligible employees
of the Company. The material features of the 1998 Plan are described below;
however, such description is entirely subject to the detailed provisions of the
1998 Plan included herein as Appendix A.
 
PURPOSES OF THE 1998 PLAN
 
     The board of directors believes that the Company's long-term success is
dependent upon the ability of the Company to attract and retain outstanding
individuals and to motivate them to exert their best efforts on behalf of the
Company's interests, and that stock option plans constitute an important part of
the Company's compensation of its officers and other eligible employees. See
"The Management Development and Compensation Committee Report on Executive
Compensation."
 
     The 1998 Plan provides eligible employees selected by the Committee for
participation in the 1998 Plan with added incentives to continue in the
long-term service of the Company. It creates in the employees a more direct
interest in the future success of the operations of the Company by relating
incentive compensation to the Company's long-term performance and shareholder
value, as reflected in the value of the Company's common stock. The 1998 Plan is
also designed to retain and motivate participating employees by providing an
opportunity for investment in the Company.
 
     Substantially all of the Company's employees are eligible for consideration
by the Committee for grants under the 1998 Plan. Mr. Plank and Mr. Farris, both
of whom serve as officers and directors of the Company, as well as each of the
Company's other officers named in the Summary Compensation Table presented
above, are eligible to receive future grants under the proposed 1998 Plan.
 
ADMINISTRATION
 
     The 1998 Plan is administered by the Committee, which is composed of
outside, non-employee directors. The Committee selects the participants who will
receive grants pursuant to the 1998 Plan, is authorized to adopt rules,
guidelines and practices governing the 1998 Plan, and is authorized to interpret
the provisions of the 1998 Plan and any related agreements. The decisions of the
Committee are final.
 
     The 1998 Plan empowers the Committee, from time to time during a period of
five years following February 6, 1998, unless earlier terminated by the board of
directors, to grant stock options to eligible employees of the Company and its
subsidiaries. The 1998 Plan authorizes 2,500,000 shares of the Company's common
stock for issuance. The maximum number of shares available for issuance under
the 1998 Plan is subject to appropriate adjustment in the event of a
reorganization, stock split, stock dividend, combination of shares, merger,
consolidation or other recapitalization of the Company.
 
                                       23
<PAGE>   27
 
ELEMENTS OF THE 1998 PLAN
 
     The 1998 Plan provides for grants of stock options which allow the
participant the right to purchase a specified number of shares of the Company's
common stock at some time in the future at a price of not less than the fair
market value of the stock on the date the option is granted. The terms and
conditions of grants under the 1998 Plan, including number of options granted,
number of shares subject to each option, expiration and exercise price, are
determined by the Committee at the time of grant. The 1998 Plan, however,
establishes that no eligible employee may be granted options which in the
aggregate pertain to in excess of 25 percent of the shares of the Company's
common stock authorized for issuance under the 1998 Plan. Except if there is a
reorganization, liquidation or a change in control as defined in the 1998 Plan,
each option granted under the 1998 Plan becomes exercisable in 25-percent
increments on each of the next four anniversaries of the date the option is
granted. Each 25-percent increment becomes exercisable only if the participant
has been continuously employed by the Company from the date the option is
granted through the date on which each additional 25-percent increment becomes
exercisable. Options are generally nontransferable and are designated as
non-qualified stock options under Section 422 of the Internal Revenue Code of
1986, as amended (the "Internal Revenue Code"). Options may be exercisable for a
maximum of ten years from the date of grant. The exercise price is payable in
either cash, by delivery of already-owned shares of the Company's common stock
with a fair market value equal to the exercise price, or a combination thereof.
 
     A change in control occurs when a person, partnership or corporation acting
in concert, or any or all of them, acquires more than 20 percent of the
Company's outstanding voting securities. A change in control shall not occur if,
prior to the acquisition of more than 20 percent of the Company's voting
securities, the Company's board of directors by majority vote designates the
person, partnership or corporation as an approved acquirer and resolves that a
change in control will not have occurred.
 
     If there is a change in control, the Committee may accelerate the exercise
date of any outstanding options; make any outstanding options fully vested and
exercisable; grant a cash bonus award to any participant in an amount necessary
to pay the exercise price of all or any portion of the options then held by the
participant; pay cash to any or all participants (in exchange for the
cancellation of their outstanding options) in an amount equal to the difference
between the exercise price of the options and the greater of the tender offer
price for the underlying stock or the fair market value of the stock on the date
of the cancellations; or make any other adjustments or amendments to the
outstanding options. The change in control provisions may in certain
circumstances discourage a takeover of the Company or make it more difficult,
and may have a similar effect on removal of incumbent management. The change in
control provisions are not the result of management's knowledge of any specific
efforts to accumulate shares of the Company's common stock or to obtain control
of the Company by means of a merger, tender offer, solicitation of proxies or
consents or otherwise, nor are they part of a plan to implement a series of
anti-takeover measures.
 
AMENDMENT, MODIFICATION AND TERMINATION OF THE 1998 PLAN
 
     The board of directors may at any time terminate, and may from time to time
amend or modify the 1998 Plan. No amendment or modification may become effective
without approval by the shareholders, if shareholder approval is required by
statutes or regulations, or if the Company, on advice of counsel, determines
that shareholder approval is otherwise necessary or desirable. No amendment,
modification or termination will in any manner adversely affect any outstanding
option without the consent of the participant holding the option. Unless earlier
terminated, options may be granted under the 1998 Plan until February 6, 2003.
 
FEDERAL INCOME TAX CONSEQUENCES
 
     The Company has been advised by its tax counsel that stock option grants
made under the 1998 Plan will give rise to the following tax events for U.S.
citizens and residents under U.S. federal income tax law.
 
     All options granted under the 1998 Plan are non-qualified (non-statutory)
options. The participants will not be subject to tax upon the grant of the
option and the Company will not be entitled to a federal income tax deduction by
reason of a grant. When a participant exercises an option granted under the 1998
Plan, the excess
                                       24
<PAGE>   28
 
of the fair market value of the shares on the date of exercise over the option
exercise price will be treated as taxable compensation to the participant, and
the total of such compensation will be subject to applicable tax withholding.
The Company will be entitled to a federal income tax deduction equal to the
amount of the participant's taxable compensation.
 
     The 1998 Plan and the stock options granted thereunder are structured to
qualify as "performance-based" pursuant to the regulations relating to Section
162(m) of the Internal Revenue Code as amended by the Omnibus Budget
Reconciliation Act of 1993.
 
BENEFITS UNDER THE 1998 PLAN
 
     The benefits to be received by participants under the terms of the 1998
Plan are not yet determinable. Such benefits are subject to the discretion and
approval of the Committee as described above.
 
RECOMMENDATION AND REQUIRED AFFIRMATIVE VOTE
 
     The affirmative vote of the holders of a majority of the shares of the
Company's common stock voted, in person or by proxy, and entitled to vote at the
1998 annual meeting is required to approve the 1998 Plan. The 1998 Plan and any
stock options granted thereunder are conditional upon and of no force or effect
unless the 1998 Plan receives approval by the requisite vote of shareholders.
 
     THE BOARD OF DIRECTORS RECOMMENDS THAT SHAREHOLDERS VOTE "FOR" THE PROPOSAL
TO APPROVE THE 1998 STOCK OPTION PLAN.
 
                                       25
<PAGE>   29
 
                         INDEPENDENT PUBLIC ACCOUNTANTS
 
     Arthur Andersen LLP was the Company's independent public accounting firm
for the fiscal year 1997 and has been selected to continue in that capacity for
1998. Representatives of Arthur Andersen LLP will be present at the annual
meeting and will have an opportunity to make a statement if they desire to do so
and to respond to appropriate questions.
 
                             SHAREHOLDER PROPOSALS
 
     Shareholders are entitled to submit proposals on matters appropriate for
shareholder action consistent with regulations of the Securities and Exchange
Commission and the Company's bylaws. Should a shareholder wish to have a
proposal appear in the Company's proxy statement for next year's annual meeting,
under the regulations of the Securities and Exchange Commission, it must be
received by the Company's corporate secretary (at 2000 Post Oak Boulevard, Suite
100, Houston, Texas 77056-4400) on or before November 30, 1998.
 
                                 OTHER BUSINESS
 
     All items of business intended to be brought before the meeting are set
forth in this proxy statement. Management knows of no other business to be
presented. If other matters of business not presently known to management are
properly raised at the meeting, the proxies will vote on the matters in
accordance with the best judgment of the proxy holders.
 
                                          By order of the Board of Directors
 
                                          APACHE CORPORATION
 
                                          /s/ C. L. Peper

                                          C. L. PEPER
                                          Corporate Secretary
 
     NOTE: Shareholders are requested to complete, sign, date and promptly
return the enclosed proxy card, using the postage-paid business reply envelope
provided.
 
                                       26
<PAGE>   30
 
                                                                     APPENDIX A
 
                               APACHE CORPORATION
 
                             1998 STOCK OPTION PLAN
 
                                       A-1
<PAGE>   31
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                             PAGE
                                                                             ----
<S>      <C>   <C>                                                           <C>
Section  1 -- Introduction.................................................  A-3
         1.1   Establishment...............................................  A-3
         1.2   Purposes....................................................  A-3
         1.3   Effective Date..............................................  A-3
Section  2 -- Definitions..................................................  A-3
         2.1   Definitions.................................................  A-3
         2.2   Headings; Gender and Number.................................  A-4
Section  3 -- Plan Administration..........................................  A-4
Section  4 -- Stock Subject to the Plan....................................  A-5
         4.1   Number of Shares............................................  A-5
         4.2   Other Shares of Stock.......................................  A-5
         4.3   Adjustments for Stock Split, Stock Dividend, Etc. ..........  A-5
         4.4   Dividend Payable in Stock of Another Corporation, Etc. .....  A-5
         4.5   Other Changes in Stock......................................  A-5
         4.6   Rights to Subscribe.........................................  A-5
         4.7   General Adjustment Rules....................................  A-6
         4.8   Determination by the Committee, Etc. .......................  A-6
Section  5 -- Reorganization or Liquidation................................  A-6
Section  6 -- Participation................................................  A-6
Section  7 -- Stock Options................................................  A-7
         7.1   Grant of Stock Options......................................  A-7
         7.2   Stock Option Agreements.....................................  A-7
         7.3   Stockholder Privileges......................................  A-10
Section  8 -- Change in Control............................................  A-10
         8.1   In General..................................................  A-10
         8.2   Limitation on Payments......................................  A-10
         8.3   Definition..................................................  A-10
Section  9 -- Rights of Employees, Participants............................  A-10
         9.1   Employment..................................................  A-10
         9.2   Nontransferability..........................................  A-10
Section  10 -- General Restrictions........................................  A-11
         10.1  Investment Representations..................................  A-11
         10.2  Compliance with Securities Laws.............................  A-11
Section  11 -- Other Employee Benefits.....................................  A-11
Section  12 -- Plan Amendment, Modification and Termination................  A-11
Section  13 -- Withholding.................................................  A-12
         13.1  Withholding Requirement.....................................  A-12
         13.2  Withholding With Stock......................................  A-12
Section  14 -- Requirements of Law.........................................  A-12
         14.1  Requirements of Law.........................................  A-12
         14.2  Federal Securities Laws Requirements........................  A-12
         14.3  Governing Law...............................................  A-12
Section  15 -- Duration of the Plan........................................  A-13
</TABLE>
 
                                       A-2
<PAGE>   32
 
                               APACHE CORPORATION
 
                             1998 STOCK OPTION PLAN
 
                                   SECTION 1
 
                                  INTRODUCTION
 
     1.1  Establishment. Apache Corporation, a Delaware corporation (hereinafter
referred to, together with its Affiliated Corporations (as defined in Section
2.1 hereof) as the "Company" except where the context otherwise requires),
hereby establishes the Apache Corporation 1998 Stock Option Plan (the "Plan")
for Eligible Employees (as defined in Section 2.1 hereof). The Plan permits the
grant of stock options to Eligible Employees selected by the Committee (as
defined in Section 2.1 hereof).
 
     1.2  Purposes. The purposes of the Plan are to provide the Eligible
Employees designated by the Committee for participation in the Plan with added
incentives to continue in the long-term service of the Company and to create in
such employees a more direct interest in the future success of the operations of
the Company by relating incentive compensation to increases in stockholder
value, so that the income of those employees is more closely aligned with the
interests of the Company's stockholders. The Plan is also designed to attract
outstanding individuals and to retain and motivate Eligible Employees by
providing an opportunity for investment in the Company.
 
     1.3  Effective Date. The Effective Date of the Plan (the "Effective Date")
shall be February 6, 1998. This Plan and each option granted hereunder is
conditioned on and shall be of no force or effect until approval of the Plan by
the holders of the shares of voting stock of the Company unless the Company, on
the advice of counsel, determines that stockholder approval is not necessary.
The Committee may grant options the exercise of which shall be expressly subject
to the condition that the Plan shall have been approved by the stockholders of
the Company.
 
                                   SECTION 2
 
                                  DEFINITIONS
 
     2.1  Definitions. The following terms shall have the meanings set forth
below:
 
          (a) "Affiliated Corporation" means any corporation or other entity
     (including but not limited to a partnership) which is affiliated with
     Apache Corporation through stock ownership or otherwise and is treated as a
     common employer under the provisions of Sections 414(b) and (c) or any
     successor section(s) of the Internal Revenue Code.
 
          (b) "Board" means the Board of Directors of the Company.
 
          (c) "Committee" means the Stock Option Plan Committee of the Board,
     which is empowered hereunder to take actions in the administration of the
     Plan. The Committee shall be constituted at all times as to permit the Plan
     to comply with: (i) Rule 16b-3 or any successor rule(s) promulgated under
     the Securities Exchange Act of 1934, as amended (the "1934 Act"), and (ii)
     Section 162(m) or any successor section(s) of the Internal Revenue Code and
     the regulations promulgated thereunder.
 
          (d) "Eligible Employees" means those full-time employees (including,
     without limitation, officers and directors who are also employees) of the
     Company or any division thereof, upon whose judgment, initiative and
     efforts the Company is, or will become, largely dependent for the
     successful conduct of its business.
 
          (e) "Fair Market Value" means the closing price of the Stock as
     reported on the New York Stock Exchange, Inc. Composite Transactions
     Reporting System for a particular date. If there are no Stock transactions
     on such date, the Fair Market Value shall be determined as of the
     immediately preceding date on which there were Stock transactions.
 
                                       A-3
<PAGE>   33
 
          (f) "Internal Revenue Code" means the Internal Revenue Code of 1986,
     as it may be amended from time to time.
 
          (g) "Option" means a right to purchase Stock at a stated price for a
     specified period of time. All Options granted under the Plan shall be
     Options which are not "incentive stock options" as described in Section 422
     or any successor section(s) of the Internal Revenue Code.
 
          (h) "Option Price" means the price at which shares of Stock subject to
     an Option may be purchased, determined in accordance with subsection 7.2(b)
     hereof.
 
          (i) "Participant" means an Eligible Employee designated by the
     Committee from time to time during the term of the Plan to receive one or
     more Options under the Plan.
 
          (j) "Stock" means the $1.25 par value Common Stock of the Company.
 
     2.2  Headings; Gender and Number. The headings contained in the Plan are
for reference purposes only and shall not affect in any way the meaning or
interpretation of the Plan. Except when otherwise indicated by the context, the
masculine gender shall also include the feminine gender, and the definition of
any term herein in the singular shall also include the plural.
 
                                   SECTION 3
 
                              PLAN ADMINISTRATION
 
     The Plan shall be administered by the Committee. In accordance with the
provisions of the Plan, the Committee shall, in its sole discretion, select the
Participants from among the Eligible Employees, determine the Options to be
granted pursuant to the Plan, the number of shares of Stock to be issued
thereunder, the time at which such Options are to be granted, fix the Option
Price, and establish such other terms and requirements as the Committee may deem
necessary or desirable and consistent with the terms of the Plan. The Committee
shall determine the form or forms of the agreements with Participants which
shall evidence the particular provisions, terms, conditions, rights and duties
of the Company and the Participants with respect to Options granted pursuant to
the Plan, which provisions need not be identical except as may be provided
herein. The Committee may from time to time adopt such rules and regulations for
carrying out the purposes of the Plan as it may deem proper and in the best
interests of the Company. The Committee may correct any defect, supply any
omission or reconcile any inconsistency in the Plan, or in any agreement entered
into hereunder, in the manner and to the extent it shall deem expedient and it
shall be the sole and final judge of such expediency. No member of the Committee
shall be liable for any action or determination made in good faith. The
determination, interpretations and other actions of the Committee pursuant to
the provisions of the Plan shall be binding and conclusive for all purposes and
on all persons.
 
     The Plan is intended to comply with the requirements of Section 162(m) or
any successor section(s) of the Internal Revenue Code ("Section 162(m)") as to
any "covered employee" as defined in Section 162(m), and shall be administered,
interpreted and construed consistently therewith. In accordance with this
intent, the amount of compensation a Participant may receive from Options
granted under the Plan shall be based solely on an increase in the value of the
Stock after the date of the grant of the Option, or such other bases as may be
permitted by applicable law. The Committee is authorized to take such additional
action, if any, that may be required to ensure that the Plan satisfies the
requirements of Section 162(m) and the regulations promulgated or revenue
rulings published thereunder.
 
                                       A-4
<PAGE>   34
 
                                   SECTION 4
 
                           STOCK SUBJECT TO THE PLAN
 
     4.1  Number of Shares. Subject to Section 7.1 and to adjustment pursuant to
Section 4.3 hereof, two million five hundred thousand (2,500,000) shares of
Stock are authorized for issuance under the Plan in accordance with the
provisions of the Plan and subject to such restrictions or other provisions as
the Committee may from time to time deem necessary. This authorization may be
increased from time to time by approval of the Board and the stockholders of the
Company if, in the opinion of counsel for the Company, such stockholder approval
is required. Shares of Stock which may be issued upon exercise of Options shall
be applied to reduce the maximum number of shares of Stock remaining available
for use under the Plan. The Company shall at all times during the term of the
Plan and while any Options are outstanding retain as authorized and unissued
Stock, or as Stock in the Company's treasury, at least the number of shares from
time to time required under the provisions of the Plan, or otherwise assure
itself of its ability to perform its obligations hereunder.
 
     4.2  Other Shares of Stock. Any shares of Stock that are subject to an
Option which expires, is forfeited, is cancelled, or for any reason is
terminated unexercised, and any shares of Stock that for any other reason are
not issued to a Participant or are forfeited shall automatically become
available for use under the Plan.
 
     4.3  Adjustments for Stock Split, Stock Dividend, Etc. If the Company shall
at any time increase or decrease the number of its outstanding shares of Stock
or change in any way the rights and privileges of such shares by means of the
payment of a Stock dividend or any other distribution upon such shares payable
in Stock, or through a Stock split, subdivision, consolidation, combination,
reclassification or recapitalization involving the Stock, then in relation to
the Stock that is affected by one or more of the above events, the numbers,
rights and privileges of the following shall be increased, decreased or changed
in like manner as if they had been issued and outstanding, fully paid and
nonassessable at the time of such occurrence: (i) the shares of Stock as to
which Options may be granted under the Plan; and (ii) the shares of the Stock
then included in each outstanding Option granted hereunder.
 
     4.4  Dividend Payable in Stock of Another Corporation, Etc. If the Company
shall at any time pay or make any dividend or other distribution upon the Stock
payable in securities or other property (except money or Stock), a proportionate
part of such securities or other property shall be set aside and delivered to
any Participant then holding an Option for the particular type of Stock for
which the dividend or other distribution was made, upon exercise thereof. Prior
to the time that any such securities or other property are delivered to a
Participant in accordance with the foregoing, the Company shall be the owner of
such securities or other property and shall have the right to vote the
securities, receive any dividends payable on such securities, and in all other
respects shall be treated as the owner. If securities or other property which
have been set aside by the Company in accordance with this Section are not
delivered to a Participant because an Option is not exercised, then such
securities or other property shall remain the property of the Company and shall
be dealt with by the Company as it shall determine in its sole discretion.
 
     4.5  Other Changes in Stock. In the event there shall be any change, other
than as specified in Sections 4.3 and 4.4 hereof, in the number or kind of
outstanding shares of Stock or of any stock or other securities into which the
Stock shall be changed or for which it shall have been exchanged, and if the
Committee shall in its discretion determine that such change equitably requires
an adjustment in the number or kind of shares subject to outstanding Options or
which have been reserved for issuance pursuant to the Plan but are not then
subject to an Option, then such adjustments shall be made by the Committee and
shall be effective for all purposes of the Plan and on each outstanding Option
that involves the particular type of stock for which a change was effected.
 
     4.6  Rights to Subscribe. If the Company shall at any time grant to the
holders of its Stock rights to subscribe pro rata for additional shares thereof
or for any other securities of the Company or of any other corporation, there
shall be reserved with respect to the shares then under Option to any
Participant of the particular class of Stock involved the Stock or other
securities which the Participant would have been entitled
 
                                       A-5
<PAGE>   35
 
to subscribe for if immediately prior to such grant the Participant had
exercised his entire Option. If, upon exercise of any such Option, the
Participant subscribes for the additional shares or other securities, the Option
Price shall be increased by the amount of the price that is payable by the
Participant for such additional shares or other securities.
 
     4.7  General Adjustment Rules. No adjustment or substitution provided for
in this Section 4 shall require the Company to sell a fractional share of Stock
under any Option, or otherwise issue a fractional share of Stock, and the total
substitution or adjustment with respect to each Option shall be limited by
deleting any fractional share. In the case of any such substitution or
adjustment, the total Option Price for the shares of Stock then subject to the
Option shall remain unchanged but the Option Price per share under each such
Option shall be equitably adjusted by the Committee to reflect the greater or
lesser number of shares of Stock or other securities into which the Stock
subject to the Option may have been changed.
 
     4.8  Determination by the Committee, Etc. Adjustments under this Section 4
shall be made by the Committee, whose determinations with regard thereto shall
be final and binding upon all parties thereto.
 
                                   SECTION 5
 
                         REORGANIZATION OR LIQUIDATION
 
     In the event that the Company is merged or consolidated with another
corporation and the Company is not the surviving corporation, or if all or
substantially all of the assets or more than 20 percent of the outstanding
voting stock of the Company is acquired by any other corporation, business
entity or person, or in case of a reorganization (other than a reorganization
under the United States Bankruptcy Code) or liquidation of the Company, and if
the provisions of Section 8 hereof do not apply, the Committee, or the board of
directors of any corporation assuming the obligations of the Company, shall, as
to the Plan and outstanding Options either (i) make appropriate provision for
the adoption and continuation of the Plan by the acquiring or successor
corporation and for the protection of any such outstanding Options by the
substitution on an equitable basis of appropriate stock of the Company or of the
merged, consolidated or otherwise reorganized corporation which will be issuable
with respect to the Stock, provided that no additional benefits shall be
conferred upon the Participants holding such Options as a result of such
substitution, and the excess of the aggregate Fair Market Value of the shares
subject to the Options immediately after such substitution over the Option Price
thereof is not more than the excess of the aggregate Fair Market Value of the
shares subject to such Options immediately before such substitution over the
Option Price thereof, or (ii) upon written notice to the Participants, provide
that all unexercised Options shall be exercised within a specified number of
days of the date of such notice or such Options will be terminated. In the
latter event, the Committee shall accelerate the exercise dates of outstanding
Options so that all Options become fully vested prior to any such event.
 
                                   SECTION 6
 
                                 PARTICIPATION
 
     Participants in the Plan shall be those Eligible Employees who, in the
judgment of the Committee, are performing, or during the term of their incentive
arrangement will perform, vital services in the management, operation and
development of the Company or an Affiliated Corporation, and significantly
contribute, or are expected to significantly contribute, to the achievement of
the Company's long-term corporate economic objectives. Participants may be
granted from time to time one or more Options; provided, however, that the grant
of each such Option shall be separately approved by the Committee, and receipt
of one such Option shall not result in automatic receipt of any other Option.
Upon determination by the Committee that an Option is to be granted to a
Participant, written notice shall be given to such person, specifying the terms,
conditions, rights and duties related thereto. Each Participant shall, if
required by the Committee, enter into an agreement with the Company, in such
form as the Committee shall determine and which is consistent with the
provisions of the Plan, specifying such terms, conditions, rights and duties.
Options shall be deemed to be granted as of the date specified in the grant
resolution of the Committee, which date shall be the date of any
 
                                       A-6
<PAGE>   36
 
related agreement with the Participant. In the event of any inconsistency
between the provisions of the Plan and any such agreement entered into
hereunder, the provisions of the Plan shall govern.
 
                                   SECTION 7
 
                                 STOCK OPTIONS
 
     7.1  Grant of Stock Options. Coincident with or following designation for
participation in the Plan, an Eligible Employee may be granted one or more
Options. Grants of Options under the Plan shall be made by the Committee. In no
event shall the exercise of one Option affect the right to exercise any other
Option or affect the number of shares of Stock for which any other Option may be
exercised, except as provided in subsection 7.2(j) hereof. During the life of
the Plan, no Eligible Employee may be granted Options which in the aggregate
pertain to in excess of 25 percent of the total shares of Stock authorized under
the Plan.
 
     7.2  Stock Option Agreements. Each Option granted under the Plan shall be
evidenced by a written stock option agreement which shall be entered into by the
Company and the Participant to whom the Option is granted (the "Stock Option
Agreement"), and which shall contain the following terms and conditions, as well
as such other terms and conditions, not inconsistent therewith, as the Committee
may consider appropriate in each case.
 
          (a) Number of Shares. Each Stock Option Agreement shall state that it
     covers a specified number of shares of Stock, as determined by the
     Committee.
 
          (b) Price. The price at which each share of Stock covered by an Option
     may be purchased shall be determined in each case by the Committee and set
     forth in the Stock Option Agreement, but in no event shall the price be
     less than the Fair Market Value of the Stock on the date the Option is
     granted.
 
          (c) Duration of Options; Employment Required For Exercise. Each Stock
     Option Agreement shall state the period of time, determined by the
     Committee, within which the Option may be exercised by the Participant (the
     "Option Period"). The Option Period must end, in all cases, not more than
     ten years from the date an Option is granted. Except as otherwise provided
     in Sections 5 and 8 and subsection 7.2(d)(iv) hereof, each Option granted
     under the Plan shall become exercisable in increments such that 25 percent
     of the Option will become exercisable on each of the four subsequent
     one-year anniversaries of the date the Option is granted, but each such
     additional 25-percent increment shall become exercisable only if the
     Participant has been continuously employed by the Company from the date the
     Option is granted through the date on which each such additional 25-percent
     increment becomes exercisable.
 
          (d) Termination of Employment, Death, Disability, Etc. Each Stock
     Option Agreement shall provide as follows with respect to the exercise of
     the Option upon termination of the employment or the death of the
     Participant:
 
             (i) If the employment of the Participant by the Company is
        terminated within the Option Period for cause, as determined by the
        Company, the Option shall thereafter be void for all purposes. As used
        in this subsection 7.2(d), "cause" shall mean a gross violation, as
        determined by the Company, of the Company's established policies and
        procedures, provided that the effect of this subsection 7.2(d) shall be
        limited to determining the consequences of a termination and that
        nothing in this subsection 7.2(d) shall restrict or otherwise interfere
        with the Company's discretion with respect to the termination of any
        employee.
 
             (ii) If the Participant retires from employment by the Company on
        or after attaining age 65, the Option may be exercised by the
        Participant within 36 months following his or her retirement (provided
        that such exercise must occur within the Option Period), but not
        thereafter. In the event of the Participant's death during such 36-month
        period, each Option may be exercised by those entitled to do so in the
        manner referred to in (iv) below. In any such case the Option may be
        exercised only as to the shares as to which the Option had become
        exercisable on or before the date of the Participant's retirement.
                                       A-7
<PAGE>   37
 
             (iii) If the Participant becomes disabled (as determined pursuant
        to the Company's Long-Term Disability Plan or any successor plan),
        during the Option Period while still employed, or within the three-month
        period referred to in (v) below, or within the 36-month period referred
        to in (ii) above, the Option may be exercised by the Participant or by
        his or her guardian or legal representative, within twelve months
        following the Participant's disability, or within the 36-month period
        referred to in (ii) above if applicable and if longer (provided that
        such exercise must occur within the Option Period), but not thereafter.
        In the event of the Participant's death during such twelve-month period,
        each Option may be exercised by those entitled to do so in the manner
        referred to in (iv) below. In any such case, the Option may be exercised
        only as to the shares of Stock as to which the Option had become
        exercisable on or before the date of the Participant's disability.
 
             (iv) In the event of the Participant's death while still employed
        by the Company, each Option of the deceased Participant may be exercised
        by those entitled to do so under the Participant's will or under the
        laws of descent and distribution within twelve months following the
        Participant's death (provided that in any event such exercise must occur
        within the Option Period), but not thereafter, as to all shares of Stock
        which are subject to such Option, including each 25-percent increment of
        the Option, if any, which has not yet become exercisable at the time of
        the Participant's death. In the event of the Participant's death within
        the 36-month period referred to in (ii) above or within the twelve-month
        period referred to in (iii) above, each Option of the deceased
        Participant that is exercisable at the time of death may be exercised by
        those entitled to do so under the Participant's will or under the laws
        of descent and distribution within twelve months following the
        Participant's death or within the 36-month period referred to in (ii)
        above, if applicable and if longer (provided that in any event such
        exercise must occur within the Option Period). The provisions of this
        paragraph (iv) of subsection 7.2(d) shall be applicable to each Stock
        Option Agreement as if set forth therein word for word. Each Stock
        Option Agreement executed by the Company prior to the adoption of this
        provision shall be deemed amended to include the provisions of this
        paragraph and all Options granted pursuant to such Stock Option
        Agreements shall be exercisable as provided herein.
 
             (v) If the employment of the Participant by the Company is
        terminated (which for this purpose means that the Participant is no
        longer employed by the Company or by an Affiliated Corporation) within
        the Option Period for any reason other than cause, the Participant's
        retirement on or after attaining age 65, the Participant's disability or
        death, the Option may be exercised by the Participant within three
        months following the date of such termination (provided that such
        exercise must occur within the Option Period), but not thereafter. In
        any such case, the Option may be exercised only as to the shares as to
        which the Option had become exercisable on or before the date of
        termination of the Participant's employment.
 
          (e) Transferability. Each Stock Option Agreement shall provide that
     the Option granted therein is not transferable by the Participant except by
     will or pursuant to the laws of descent and distribution, and that such
     Option is exercisable during the Participant's lifetime only by him or her,
     or in the event of the Participant's disability or incapacity, by his or
     her guardian or legal representative.
 
          (f) Agreement to Continue in Employment. Each Stock Option Agreement
     shall contain the Participant's agreement to remain in the employment of
     the Company, at the pleasure of the Company, for a continuous period of at
     least one year after the date of such Stock Option Agreement, at the salary
     rate in effect on the date of such agreement or at such changed rate as may
     be fixed, from time to time, by the Company.
 
          (g) Exercise, Payments, Etc.
 
             (i) Each Stock Option Agreement shall provide that the method for
        exercising the Option granted therein shall be by delivery to the Office
        of the Secretary of the Company of written notice specifying the number
        of shares of Stock with respect to which such Option is exercised and
        payment of the Option Price. Such notice shall be in a form satisfactory
        to the Committee and shall
 
                                       A-8
<PAGE>   38
 
        specify the particular Options (or portions thereof) which are being
        exercised and the number of shares of Stock with respect to which the
        Options are being exercised. The exercise of the Option shall be deemed
        effective on the date such notice is received by the Office of the
        Secretary and payment is made to the Company of the Option Price (the
        "Exercise Date"). If requested by the Company, such notice shall contain
        the Participant's representation that he or she is purchasing the Stock
        for investment purposes only and his or her agreement not to sell any
        Stock so purchased in any manner that is in violation of the Securities
        Act of 1933, as amended, or any applicable state law. Such restriction,
        or notice thereof, shall be placed on the certificates representing the
        Stock so purchased. The purchase of such Stock shall take place at the
        principal offices of the Company upon delivery of such notice, at which
        time the Option Price shall be paid in full by any of the methods or any
        combination of the methods set forth in (ii) below. A properly executed
        certificate or certificates representing the Stock shall be issued by
        the Company and delivered to the Participant. If certificates
        representing Stock are used to pay all or part of the Option Price,
        separate certificates for the same number of shares of Stock shall be
        issued by the Company and delivered to the Participant representing each
        certificate used to pay the Option Price, and an additional certificate
        shall be issued by the Company and delivered to Participant representing
        the additional shares of Stock, in excess of the Option Price, to which
        the Participant is entitled as a result of the exercise of the Option.
 
             (ii) the Option Price shall be paid by any of the following methods
        or any combination of the following methods:
 
                (A) in cash;
 
                (B) by personal, certified or cashier's check payable to the
           order of the Company;
 
                (C) by delivery to the Company of certificates representing a
           number of shares of Stock then owned by the Participant, the Fair
           Market Value of which equals the Option Price of the Stock purchased
           pursuant to the Option, properly endorsed for transfer to the
           Company; provided however, that shares of Stock used for this purpose
           must have been held by the Participant for such minimum period of
           time as may be established from time to time by the Committee; for
           purposes of this Plan, the Fair Market Value of any shares of Stock
           delivered in payment of the Option Price upon exercise of the Option
           shall be the Fair Market Value as of the Exercise Date; the Exercise
           Date shall be the day of delivery of the certificates for the Stock
           used as payment of the Option Price; or
 
                (D) by delivery to the Company of a properly executed notice of
           exercise together with irrevocable instructions to a broker to
           deliver to the Company promptly the amount of the proceeds of the
           sale of all or a portion of the Stock or of a loan from the broker to
           the Participant necessary to pay the Option Price.
 
          (h) Date of Grant. An Option shall be considered as having been
     granted on the date specified in the grant resolution of the Committee.
 
          (i) Tax Withholding. Each Stock Option Agreement shall provide that,
     upon exercise of the Option, the Participant shall make appropriate
     arrangements with the Company to provide for the amount of additional tax
     withholding required by Sections 3102 and 3402 or any successor section(s)
     of the Internal Revenue Code and applicable state income tax laws,
     including payment of such taxes through delivery of shares of Stock or by
     withholding Stock to be issued under the Option, as provided in Section 13
     hereof.
 
          (j) Adjustment of Options. Subject to the limitations contained in
     Sections 7 and 12 hereof, the Committee may make any adjustment in the
     Option Price, the number of shares of Stock subject to, or the terms of an
     outstanding Option and a subsequent granting of an Option, by amendment or
     by substitution for an outstanding Option. Such amendment, substitution, or
     regrant may result in terms and conditions (including Option Price, number
     of shares of Stock covered, vesting schedule or Option
 
                                       A-9
<PAGE>   39
 
     Period) that differ from the terms and conditions of the original Option.
     The Committee may not, however, adversely affect the rights of any
     Participant to previously granted Options without the consent of such
     Participant. If such action is effected by amendment, the effective date of
     grant of such amendment will be the date of grant of the original Option.
 
     7.3  Stockholder Privileges. No Participant shall have any rights as a
stockholder with respect to any shares of Stock covered by an Option until the
Participant becomes the holder of record of such Stock. Except as provided in
Section 4 hereof, no adjustments shall be made for dividends or other
distributions or other rights as to which there is a record date preceding the
date on which such Participant becomes the holder of record of such Stock.
 
                                   SECTION 8
 
                               CHANGE IN CONTROL
 
     8.1  In General. In the event of a change in control of the Company as
defined in Section 8.3 hereof, then the Committee may, in its sole discretion,
without obtaining stockholder approval, to the extent permitted in Section 12
hereof, take any or all of the following actions: (a) accelerate the dates on
which any outstanding Options become exercisable or make all such Options fully
vested and exercisable; (b) grant a cash bonus award to any Participant in an
amount necessary to pay the Option Price of all or any portion of the Options
then held by such Participant; (c) pay cash to any or all Participants in
exchange for the cancellation of their outstanding Options in an amount equal to
the difference between the Option Price of such Options and the greater of the
tender offer price for the underlying Stock or the Fair Market Value of the
Stock on the date of the cancellation of the Options; and (d) make any other
adjustments or amendments to the outstanding Options.
 
     8.2  Limitation on Payments. If the provisions of this Section 8 would
result in the receipt by any Participant of a payment within the meaning of
Section 280G or any successor section(s) of the Internal Revenue Code, and the
regulations promulgated thereunder, and if the receipt of such payment by any
Participant would, in the opinion of independent tax counsel of recognized
standing selected by the Company, result in the payment by such Participant of
any excise tax provided for in Sections 280G and 4999 or any successor
section(s) of the Internal Revenue Code, then the amount of such payment shall
be reduced to the extent required, in the opinion of independent tax counsel, to
prevent the imposition of such excise tax; provided, however, that the
Committee, in its sole discretion, may authorize the payment of all or any
portion of the amount of such reduction to the Participant.
 
     8.3  Definition. For purposes of the Plan, a "change in control" shall mean
any of the events specified in the Company's Income Continuance Plan or any
successor plan which constitute a change in control within the meaning of such
plan.
 
                                   SECTION 9
 
                       RIGHTS OF EMPLOYEES, PARTICIPANTS
 
     9.1  Employment. Nothing contained in the Plan or in any Option granted
under the Plan shall confer upon any Participant any right with respect to the
continuation of his or her employment by the Company or any Affiliated
Corporation, or interfere in any way with the right of the Company or any
Affiliated Corporation, subject to the terms of any separate employment
agreement to the contrary, at any time to terminate such employment or to
increase or decrease the level of the Participant's compensation from the level
in existence at the time of the grant of an Option. Whether an authorized leave
of absence, or absence in military or government service, shall constitute a
termination of employment shall be determined by the Committee at the time.
 
     9.2  Nontransferability. No right or interest of any Participant in an
Option granted pursuant to the Plan shall be assignable or transferable during
the lifetime of the Participant, either voluntarily or involuntarily, or
 
                                      A-10
<PAGE>   40
 
subjected to any lien, directly or indirectly, by operation of law, or
otherwise, including execution, levy, garnishment, attachment, pledge or
bankruptcy. In the event of a Participant's death, a Participant's rights and
interests in Options shall, to the extent provided in Section 7 hereof, be
transferable by testamentary will or the laws of descent and distribution, and
payment of any amounts due under the Plan shall be made to, and exercise of any
Options may be made by, the Participant's legal representatives, heirs or
legatees. If in the opinion of the Committee a person entitled to payments or to
exercise rights with respect to the Plan is disabled from caring for his or her
affairs because of mental condition, physical condition or age, payment due such
person may be made to, and such rights shall be exercised by, such person's
guardian, conservator or other legal personal representative upon furnishing the
Committee with evidence satisfactory to the Committee of such status.
 
                                   SECTION 10
 
                              GENERAL RESTRICTIONS
 
     10.1  Investment Representations. The Company may require a Participant, as
a condition of exercising an Option, to give written assurances in substance and
form satisfactory to the Company and its counsel to the effect that such person
is acquiring the Stock subject to the Option for his own account for investment
and not with any present intention of selling or otherwise distributing the
same, and to such other effects as the Company deems necessary or appropriate in
order to comply with federal and applicable state securities laws.
 
     10.2  Compliance with Securities Laws. Each Option shall be subject to the
requirement that, if at any time counsel to the Company shall determine that the
listing, registration or qualification of the shares of Stock subject to such
Option upon any securities exchange or under any state or federal law, or the
consent or approval of any governmental or regulatory body, is necessary as a
condition of, or in connection with, the issuance or purchase of shares of Stock
thereunder, such Option may not be accepted or exercised in whole or in part
unless such listing, registration, qualification, consent or approval shall have
been effected or obtained on conditions acceptable to the Committee. Nothing
herein shall be deemed to require the Company to apply for or to obtain such
listing, registration, qualification, consent or approval.
 
                                   SECTION 11
 
                            OTHER EMPLOYEE BENEFITS
 
     The amount of any compensation deemed to be received by a Participant as a
result of the exercise of an Option shall not constitute "earnings" with respect
to which any other employee benefits of such Participant are determined,
including without limitation benefits under any pension, profit sharing, life
insurance or salary continuation plan.
 
                                   SECTION 12
 
                  PLAN AMENDMENT, MODIFICATION AND TERMINATION
 
     The Board may at any time terminate, and from time to time may amend or
modify the Plan provided, however, that no amendment or modification may become
effective without approval of the amendment or modification by the Company's
stockholders if stockholder approval is required to enable the Plan to satisfy
any applicable statutory or regulatory requirements, or if the Company, on the
advice of counsel, determines that stockholder approval is otherwise necessary
or desirable.
 
     No amendment, modification or termination of the Plan shall in any manner
adversely affect any Option theretofore granted under the Plan, without the
consent of the Participant holding such Option.
 
                                      A-11
<PAGE>   41
 
                                   SECTION 13
 
                                  WITHHOLDING
 
     13.1  Withholding Requirement. The Company's obligations to deliver shares
of Stock upon the exercise of an Option shall be subject to the Participant's
satisfaction of all applicable federal, state and local income and other tax
withholding requirements.
 
     13.2  Withholding With Stock. At the time the Committee grants an Option,
it may, in its sole discretion, grant the Participant an election to pay all
such amounts of tax withholding, or any part thereof, by the transfer to the
Company, or to have the Company withhold from shares of Stock otherwise issuable
to the Participant upon the exercise of an Option, shares of Stock having a
value equal to the amount required to be withheld or such lesser amount as may
be elected by the Participant. All such elections shall be subject to the
approval or disapproval of the Committee. The value of shares of Stock to be
withheld shall be based on the Fair Market Value of the Stock on the Exercise
Date. Any such elections by Participants to have shares of Stock withheld for
this purpose will be subject to the following restrictions:
 
          (a) All elections shall be made on or prior to the Exercise Date
 
          (b) All elections shall be irrevocable.
 
          (c) If the Participant is an officer or director of the Company within
     the meaning of Section 16 or any successor section(s) of the 1934 Act
     ("Section 16"), the Participant must satisfy the requirements of such
     Section 16 and any applicable rules and regulations thereunder with respect
     to the use of Stock to satisfy such tax withholding obligation.
 
                                   SECTION 14
 
                              REQUIREMENTS OF LAW
 
     14.1 Requirements of Law. The issuance of Stock and the payment of cash
pursuant to the Plan shall be subject to all applicable laws, rules and
regulations.
 
     14.2 Federal Securities Laws Requirements. If a Participant is an officer
or director of the Company within the meaning of Section 16, Options granted
hereunder shall be subject to all conditions required under Rule 16b-3, or any
successor rule(s) promulgated under the 1934 Act, to qualify the Option for any
exception from the provisions of Section 16 available under such Rule. Such
conditions are hereby incorporated herein by reference and shall be set forth in
the agreement with the Participant which describes the Option.
 
     14.3 Governing Law. The Plan and all Stock Option Agreements hereunder
shall be construed in accordance with and governed by the laws of the State of
Texas.
 
                                      A-12
<PAGE>   42
 
                                   SECTION 15
 
                              DURATION OF THE PLAN
 
     The Plan shall terminate at such time as may be determined by the Board,
and no Option shall be granted after such termination. If not sooner terminated
under the preceding sentence, the Plan shall fully cease and expire at midnight
on February 6, 2003. Options outstanding at the time of the Plan termination
shall continue to be exercisable in accordance with the Stock Option Agreement
pertaining to such Option.
 
     Dated: February 6, 1998
 
<TABLE>
<S>                                                    <C>
ATTEST:                                                APACHE CORPORATION
 
                 /s/ CHERI L. PEPER                                   /s/ DANIEL L. SCHAEFFER
- -----------------------------------------------------  -----------------------------------------------------
                   Cheri L. Peper                                       Daniel L. Schaeffer
                 Corporate Secretary                                      Vice President
</TABLE>
 
                                      A-13
<PAGE>   43
 
================================================================================
 
                            NOTICE OF ANNUAL MEETING
 
                                OF SHAREHOLDERS
 
                                 APRIL 30, 1998
 
                              AND PROXY STATEMENT
 

                          [APACHE CORPORATION LOGO]

 
                              ONE POST OAK CENTRAL
 
                       2000 POST OAK BOULEVARD, SUITE 100
 
                           HOUSTON, TEXAS 77056-4400
 
                                      [RECYCLE LOGO]  Printed on recycled paper.
================================================================================
<PAGE>   44
- -------------------------------------------------------------------------------

                         APACHE CORPORATION - 1998 PROXY

          THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS.

     The undersigned appoints John A. Kocur, George D. Lawrence Jr. and 
Randolph M. Ferlic as Proxies, with the power of substitution, and authorizes
them to represent the undersigned at the annual meeting of shareholders to be
held April 30, 1998, or any adjournment thereof, and to vote all the shares of
common stock of Apache Corporation held of record by the undersigned on March
12, 1998, as designated on the reverse side.

This Proxy, when properly executed, will be voted in the manner directed by the
undersigned shareholder. IF NO DIRECTION IS GIVEN, THIS PROXY WILL BE VOTED
"FOR" THE ELECTION OF DIRECTORS AND "FOR" APPROVAL OF THE APACHE CORPORATION
1998 STOCK OPTION PLAN.



                                                              SEE REVERSE SIDE
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<PAGE>   45

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                           (Continued from other side)

THE DIRECTORS RECOMMEND A VOTE "FOR" ITEMS 1 AND 2

1. Election of directors -- director nominees:
         01   Eugene C. Fiedorek               03  F. H. Merelli     
         02   Mary Ralph Lowe                  04  Raymond Plank.

   |_| FOR                               |_|  WITHHOLD AUTHORITY to vote
       all nominees listed above              for all nominees listed above

   (Instruction:  To withhold authority to vote for any individual nominee,
   write the number(s) of such nominee(s) in the box to the right.)
   
                                   __________________________________________

2. Proposal to approve the Apache Corporation 1998 Stock Option Plan.

                            |_|  FOR       |_|  AGAINST        |_|  ABSTAIN

3. The Proxies are authorized to vote in their best judgment upon such other
business as may properly come before the meeting.

PLEASE MARK, SIGN, DATE AND PROMPTLY RETURN THIS PROXY CARD USING THE ENCLOSED
ENVELOPE.

     Address Change?  Mark Box |_| Indicate change below:


                                         Date ______________________________


                                         ___________________________________  
                                         Signature(s)  In  Box                
                                         Please sign exactly as name appears  
                                         at the left. Joint owners should     
                                         each sign. If acting as attorney,    
                                         executor, trustee, or in any other   
                                         representative capacity, sign name   
                                         and title. If signer is a            
                                         corporation, please sign full name   
                                         by duly authorized officer.          
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