PIONEER NATURAL RESOURCES CO
10-Q, 1997-11-14
CRUDE PETROLEUM & NATURAL GAS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D. C. 20549


                                    FORM 10-Q



 / x /          Quarterly Report Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934

                For the quarterly period ended September 30, 1997

                                       or

 /   /          Transition Report Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934
               For the transition period from _______ to ________


                           Commission File No. 1-13245


                        PIONEER NATURAL RESOURCES COMPANY
             (Exact name of Registrant as specified in its charter)


             Delaware                                        75-2702753
 (State or other jurisdiction of                          (I.R.S. Employer
  incorporation or organization)                       Identification Number)

1400 Williams Square West, 5205 N. O'Connor Blvd., Irving, Texas       75039
           (Address of principal executive offices)                  (Zip code)

       Registrant's Telephone Number, including area code : (972) 444-9001

                                 Not applicable
              (Former name, former address and former fiscal year,
                          if changed since last report)

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

                                Yes / x / No / /

Number of shares of Common Stock outstanding as of
  October 31, 1997.................................................. 74,462,613


                               Page 1 of 36 pages.

                            Exhibit index on page 34.



<PAGE>



                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

                                TABLE OF CONTENTS




                                                                          Page

                          PART I. FINANCIAL INFORMATION

Item 1.    Financial Statements

           Consolidated Balance Sheets as of September 30, 1997 and
              December 31, 1996   ........................................  3

           Consolidated Statements of Operations for the three and nine
             months ended September 30, 1997 and 1996.....................  5

           Consolidated Statement of Stockholders' Equity for the nine
             months ended September 30, 1997..............................  6

           Consolidated Statements of Cash Flows for the three and nine
             months ended September 30, 1997 and 1996.....................  7

           Notes to Consolidated Financial Statements.....................  8

Item 2.    Management's Discussion and Analysis of Financial
             Condition and Results of Operations.......................... 17


                           PART II. OTHER INFORMATION

Item 1.    Legal Proceedings.............................................. 29

Item 4.    Submission of Matters to a Vote of Security Holders............ 29

Item 6.    Exhibits and Reports on Form 8-K............................... 30

           Signatures..................................................... 33

           Exhibit Index.................................................. 34


                                        2

<PAGE>



                          PART I. FINANCIAL INFORMATION

Item 1.    Financial Statements

                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

                           CONSOLIDATED BALANCE SHEETS
                        (in thousands, except share data)

                                                   September 30,   December 31,
                                                       1997            1996
                                                   ------------    -----------
                                                   (Unaudited)

                                     ASSETS
Current assets:
  Cash and cash equivalents                        $    40,631     $    18,711
  Restricted cash                                        1,716           1,749
  Accounts receivable:
    Trade, net                                          43,482          34,075
    Affiliates                                             578             434
    Oil and gas sales                                   84,033          48,459
  Inventories                                            6,839           3,644
  Deferred income taxes                                  3,600           7,400
  Other current assets                                   5,073           2,567
                                                    ----------      ----------
          Total current assets                         185,952         117,039
                                                    ----------      ----------
Property, plant and equipment, at cost:
  Oil and gas properties, using the
    successful efforts method of accounting:
       Proved properties                             3,994,707       1,419,051
       Unproved properties                              83,402           7,331
  Natural gas processing facilities                        -            59,276
  Accumulated depletion, depreciation and
    amortization                                      (554,132)       (445,238)
                                                    ----------      ----------
                                                     3,523,977       1,040,420
                                                    ----------      ----------
Other property and equipment, net                       35,736          27,779
Other assets, net                                       51,078          14,627
                                                    ----------      ----------
                                                   $ 3,796,743     $ 1,199,865
                                                    ==========      ==========

The financial information included as of September 30, 1997 has been prepared by
           management without audit by independent public accountants.

        The accompanying notes are an integral part of these consolidated
                             financial statements.

                                        3

<PAGE>



                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

                     CONSOLIDATED BALANCE SHEETS (continued)
                        (in thousands, except share data)

                                                   September 30,   December 31,
                                                       1997            1996
                                                   ------------    -----------
                                                   (Unaudited)

                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Current maturities of long-term debt            $    11,116     $     5,381
   Undistributed unit purchases                          1,716           1,749
   Accounts payable:
      Trade                                             74,152          56,713
      Affiliates                                         2,546           7,528
   Domestic and foreign income taxes                        52           1,743
   Other current liabilities                            46,995          17,856
                                                    ----------      ----------
            Total current liabilities                  136,577          90,970
                                                    ----------      ----------
Long-term debt, less current maturities              1,601,145         320,908
Other noncurrent liabilities                           127,614           8,071
Deferred income taxes                                  213,300          60,800

Preferred stock of subsidiary                              -           188,820

Stockholders' equity:
   Preferred stock, $.01 par value; 100,000,000
      shares authorized; none issued and
      outstanding                                          -               -
   Common stock, $.01 par value; 500,000,000 shares
      authorized; 74,449,446 and 36,899,618 shares
      issued at September 30, 1997 and December 31,
      1996, respectively                                   745             369
   Additional paid-in capital                        1,626,487         462,873
   Treasury stock, at cost; 1,833,383 shares at
      December 31, 1996                                    -           (31,528)
   Unearned compensation                               (17,316)         (1,625)
   Retained earnings                                   108,191         100,207
                                                    ----------      ----------
            Total stockholders' equity               1,718,107         530,296
                                                    ----------      ----------
Commitments and contingencies (Note F)
                                                   $ 3,796,743     $ 1,199,865
                                                    ==========      ==========

The financial information included as of September 30, 1997 has been prepared by
           management without audit by independent public accountants.

        The accompanying notes are an integral part of these consolidated
                             financial statements.

                                        4

<PAGE>



                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

                      CONSOLIDATED STATEMENTS OF OPERATIONS
                      (in thousands, except per share data)
                                   (Unaudited)

                                        Three months ended   Nine months ended
                                           September 30,       September 30,
                                        ------------------   ------------------
                                         1997      1996       1997       1996
                                        --------  --------   --------  --------
Revenues:
   Oil and gas                          $150,354  $ 91,313   $348,980  $283,327
   Natural gas processing                    -       5,706        -      16,810
   Interest and other                        816    12,573      3,649    14,996
   Gain on disposition of assets, net        108     1,638      2,745    96,887
                                         -------   -------    -------   -------
                                         151,278   111,230    355,374   412,020
                                         -------   -------    -------   -------
Costs and expenses:
   Oil and gas production                 42,003    24,829     91,674    82,233
   Natural gas processing                    -       3,088        -       9,123
   Depletion, depreciation and
     amortization                         67,388    26,590    126,897    86,228
   Exploration and abandonments           15,513     3,763     34,310    14,962
   General and administrative             16,779     6,430     31,769    19,420
   Interest                               24,110    10,053     44,264    36,105
   Other                                   2,533        12      2,982       918
                                         -------   -------    -------   -------
                                         168,326    74,765    331,896   248,989
                                         -------   -------    -------   -------
Income (loss) before income taxes
   and extraordinary item                (17,048)   36,465     23,478   163,031
Income tax benefit (provision)             6,000   (15,500)    (8,500)  (47,200)
                                         -------   -------    -------   -------
Income (loss) before extraordinary item  (11,048)   20,965     14,978   115,831
Extraordinary item - loss on early
   extinguishment of debt, net of tax     (1,518)      -       (1,518)      -
                                         -------   -------    -------   -------
Net income (loss)                       $(12,566) $ 20,965   $ 13,460  $115,831
                                         =======   =======    =======   =======
Income (loss) per share:
  Primary:
    Income (loss) before extraordinary
       item                             $   (.18) $    .58   $    .34  $   3.24
    Extraordinary item                      (.03)      -         (.03)      -
                                         -------   -------    -------   -------
    Net income (loss)                   $   (.21) $    .58   $    .31  $   3.24
                                         =======   =======    =======   =======
  Fully diluted:
    Income (loss) before extraordinary
       item                             $   (.18) $    .54   $    .34  $   2.86
    Extraordinary item                      (.03)      -         (.03)      -
                                         -------   -------    -------   -------
    Net income (loss)                   $   (.21) $    .54   $    .31  $   2.86
                                         =======   =======    =======   =======
Dividends declared per share            $    .05  $    .05   $    .10  $    .10
                                         =======   =======    =======   =======
Weighted average shares outstanding       59,543    35,881     43,453    35,763
                                        ========  ========   ========  ========

         The financial information included herein has been prepared by
           management without audit by independent public accountants.

        The accompanying notes are an integral part of these consolidated
                             financial statements.

                                        5

<PAGE>



<TABLE>
                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

                 CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
                        (in thousands, except share data)
                                   (Unaudited)

<CAPTION>
                                   Common
                                   Stock                 Additional                                           Total
                                   Shares      Common     Paid-in     Treasury     Unearned     Retained   Stockholders'
                                 Outstanding   Stock      Capital       Stock    Compensation   Earnings      Equity
                                 -----------   -------   ----------   --------   ------------   --------   ------------
<S>                              <C>           <C>       <C>          <C>        <C>            <C>        <C>
Balance as of January 1, 1997     35,066,235   $   369   $  462,873   $(31,528)   $  (1,625)    $100,207   $   530,296
Exercise of long-term
  incentive plan stock options       479,999         5       11,253        -            -            -          11,258
Acquisition of MESA Inc.          31,782,263       318      982,248        -            -            -         982,566
Cancellation of treasury shares          -         (19)     (34,441)    34,460          -            -             -
Exchange of Preferred Shares
  for common shares                6,713,683        67      182,909        -            -            -         182,976
Tax benefits related to stock
  options                                -         -          2,800        -            -            -           2,800
Purchase of treasury stock           (96,120)      -            -       (2,932)         -            -          (2,932)
Restricted shares awarded            503,386         5       18,845        -        (17,951)         -             899
Amortization of unearned
  compensation                           -         -            -          -          2,260          -           2,260
Net income                               -         -            -          -            -         13,460        13,460
Dividends ($.10 per share)               -         -            -          -            -         (5,476)       (5,476)
                                 -----------    ------    ---------    -------     --------      -------    ----------
Balance as of
  September 30, 1997              74,449,446   $   745   $1,626,487   $    -      $ (17,316)    $108,191   $ 1,718,107
                                 ===========    ======    =========    =======     ========      =======    ==========
<FN>
         The financial information included herein has been prepared by
           managementwithout audit by independent public accountants.

              The accompanying notes are an integral part of these
                       consolidated financial statements.
</FN>
</TABLE>
                                        6

<PAGE>


<TABLE>

                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                   (Unaudited)
<CAPTION>
                                                     Three months ended     Nine months ended
                                                        September 30,         September 30,
                                                     -------------------   ---------------------
                                                       1997       1996       1997        1996
                                                     --------   --------   ---------   ---------
<S>     <C>    <C>    <C>    <C>    <C>    <C>
Cash flows from operating activities:
  Net income (loss)                                  $(12,566)  $ 20,965   $  13,460   $ 115,831
  Adjustments to reconcile net income (loss) to net
     cash provided by operating activities:
       Depletion, depreciation and amortization        67,388     26,590     126,897      86,228
       Exploration expenses, including dry holes       11,390      2,139      25,581      10,386
       Deferred income taxes                           (4,800)    15,200       6,600      46,900
       Gain on disposition of assets, net                (108)    (1,638)     (2,745)    (96,887)
       Other noncash items                             10,720     (3,993)     12,900      (2,316)
  Change in operating assets and liabilities, net of
     effects from acquisitions and dispositions:
       Accounts receivable                             (3,032)     1,979       8,992      21,357
       Inventories                                        729      1,336      (1,122)        782
       Other current assets                              (544)       (66)        136          88
       Accounts payable                                (4,074)     7,953        (975)      4,941
       Accrued income taxes and other current
         liabilities                                  (10,628)    (1,622)    (10,656)      2,104
                                                      -------    -------    --------    --------
         Net cash provided by operating activities     54,475     68,843     179,068     189,414
                                                      -------    -------    --------    --------
Cash flows from investing activities:
  Payment for acquisition, net of cash acquired          (519)       -          (519)        -
  Proceeds from disposition of wholly-owned
     subsidiaries, net of cash disposed                   -        4,365         -       183,102
  Proceeds from disposition of assets                     560      5,317      12,838      51,194
  Additions to oil and gas properties                 (81,300)   (65,595)   (246,574)   (139,540)
  Other property additions, net                        (4,902)    (1,561)     (9,878)     (4,531)
                                                      -------    -------    --------    --------
         Net cash provided by (used in) investing
           activities                                 (86,161)   (57,474)   (244,133)     90,225
                                                      -------    -------    --------    --------
Cash flows from financing activities:
  Borrowings under long-term debt                      63,353        -       104,896         782
  Principal payments on long-term debt                 (5,477)      (523)    (18,279)   (229,806)
  Payments of other noncurrent liabilities             (1,775)    (1,646)     (2,482)     (2,035)
  Dividends                                            (3,722)    (1,780)     (5,476)     (3,550)
  Purchase of treasury stock                              -          (45)     (2,932)       (227)
  Exercise of long-term incentive plan stock options   10,095        198      11,258       2,757
  Other                                                   -          -           -          (151)
                                                      -------    -------    --------    --------
         Net cash provided by (used in) financing
           activities                                  62,474     (3,796)     86,985    (232,230)
                                                      -------    -------    --------    --------
Effect of exchange rate changes on cash and cash
  equivalents                                             -          -           -           290
Net increase in cash and cash equivalents              30,788      7,573      21,920      47,409
Cash and cash equivalents, beginning of period          9,843     60,066      18,711      19,940
                                                      -------    -------    --------    --------
Cash and cash equivalents, end of period             $ 40,631   $ 67,639   $  40,631   $  67,639
                                                      =======    =======    ========    ========
<FN>
         The financial information included herein has been prepared by
           management without audit by independent public accountants.

              The accompanying notes are an integral part of these
                       consolidated financial statements.
</FN>
</TABLE>

                                        7

<PAGE>



                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                               September 30, 1997
                                   (Unaudited)


NOTE A.     Organization and Nature of Operations

       Pioneer Natural Resources Company  ("Pioneer") is a Delaware  corporation
whose common stock is listed and traded on the New York Stock Exchange.  Pioneer
was formed in order to complete the merger  between  Parker & Parsley  Petroleum
Company  ("Parker & Parsley")  and MESA Inc.  ("Mesa").  Pioneer was  originally
created as a wholly-owned  subsidiary of Mesa, a Texas corporation,  the purpose
of which was to allow Mesa to reincorporate  into a Delaware  corporation and to
accomplish the merger with Parker & Parsley. Both Parker & Parsley and Mesa were
oil and gas exploration and production  concerns with ownership interests in oil
and gas properties  located  principally in the  MidContinent,  Southwestern and
onshore and offshore Gulf Coast regions of the United States.

       In accordance with the provisions of Accounting  Principles Board No. 16,
"Business Combinations", the merger has been accounted for as a purchase of Mesa
by Parker &  Parsley.  As a result,  the  historical  financial  statements  for
Pioneer  are those of  Parker &  Parsley,  and  Pioneer's  financial  statements
present the  addition of Mesa's  assets and  liabilities  as an  acquisition  by
Parker & Parsley in August 1997.  Specifically,  the  accompanying  Consolidated
Statements of Operations and  Consolidated  Statements of Cash Flows include the
financial results of Mesa beginning in August 1997.

NOTE B.     Summary of Significant Accounting Policies

       In the  opinion  of  management,  the  unaudited  consolidated  financial
statements of Pioneer as of September 30, 1997 and for the three and nine months
ended  September  30,  1997 and  1996  include  all  adjustments  and  accruals,
consisting only of normal recurring accrual adjustments, which are necessary for
a fair  presentation  of the  results  for the interim  periods.  These  interim
results  are not  necessarily  indicative  of results  for a full year.  Certain
amounts in the prior  period  financial  statements  have been  reclassified  to
conform to the current period presentation.

       Certain  information  and  footnote   disclosures  normally  included  in
financial  statements  prepared in accordance with generally accepted accounting
principles  have been  condensed  or omitted in this Form 10-Q  pursuant  to the
rules  and  regulations  of  the  Securities  and  Exchange  Commission.   These
consolidated  financial  statements  should  be  read  in  connection  with  the
consolidated  financial statements and notes thereto included in the 1996 Annual
Report on Form 10-K of Parker & Parsley.

NOTE C.     Merger with Mesa

        In August 1997,  the  shareholders  of Pioneer's  predecessor  entities,
Parker & Parsley and Mesa,  approved an Amended and Restated  Agreement and Plan
of Merger  (the  "Merger  Agreement")  by a  majority  vote of 76% by holders of
Parker & Parsley  common stock and 71%,  58%, and 100% by holders of Mesa common
stock,  Mesa  Series A  Preferred  Stock  and Mesa  Series  B  Preferred  Stock,
respectively.  Mesa was a publicly traded  independent oil and gas company based
in Irving,  Texas with  substantial  producing  properties and operations in the
MidContinent  region of the United States. The Merger Agreement provided for (i)
the merger of Mesa with and into Pioneer, a wholly-owned  subsidiary of Mesa, as
a result of which  Mesa,  which  was a Texas  corporation,  reincorporated  into
Delaware  and (ii) the merger of Parker & Parsley  with and into Mesa  Operating
Co., a  wholly-owned  subsidiary  of Mesa, as a result of which Parker & Parsley
became a wholly-owned subsidiary of Pioneer (items (i) and (ii) collectively the
"Mergers").  In accordance  with the Merger  Agreement,  (i) holders of Parker &
Parsley  common stock  received one share of Pioneer common stock for each share
held;  (ii)  holders of Mesa common stock  received one share of Pioneer  common
stock  for every  seven  shares  held;  and (iii)  holders  of Mesa  Series A 8%
Cumulative   Convertible  Preferred  Stock  and  Mesa  Series  B  8%  Cumulative
Convertible  Preferred  Stock  received 1.25 shares of Pioneer  common stock for
every seven shares held. No fractional shares were issued.

                                        8

<PAGE>



        The aggregate Pioneer purchase  consideration  related to the assets and
liabilities  of Mesa,  including  transaction  costs,  was $990.5  million.  The
following  table  represents  the  allocation  of the total  purchase  price (in
thousands) of Mesa to the acquired  assets and  liabilities  based upon the fair
values  assigned to each of the  significant  assets  acquired  and  liabilities
assumed.  Any future adjustments to the allocation of the purchase price are not
anticipated to be material to Pioneer's financial statements.

      Recorded amounts of assets acquired, including
         cash acquired of $7,398                            $2,496,579
      Liabilities assumed, including $152,500 of
         deferred taxes                                      1,506,096
                                                             ---------
                                                            $  990,483
                                                             =========
      Pioneer common stock consideration (31,782,263
         shares valued at $30.82 per share)                 $  982,566
      Transaction costs                                          7,917
                                                             ---------
      Aggregate purchase consideration                      $  990,483
                                                             =========

        The  liabilities  assumed  include  amounts  recorded for litigation and
certain other preacquisition contingencies of Mesa.

NOTE D.     Credit Facility Agreements

        On August 7, 1997, Pioneer Natural Resources USA, Inc. (the "Borrower"),
a  wholly-owned  subsidiary  of  Pioneer,   entered  into  two  Credit  Facility
Agreements  ("Credit  Facility  Agreements")  with a  syndicate  of  banks  (the
"Banks") that  refinanced the credit  facilities of Parker & Parsley and Mesa as
of the  date  of the  Mergers.  One  Credit  Facility  Agreement  (the  "Primary
Facility")  provides for a $1.1 billion credit  facility.  The maturity date for
the Primary  Facility is August 7, 2002.  The second Credit  Facility  Agreement
(the  "364-day  Facility")  provides for a $300 million  credit  facility with a
maturity  date of August  5,  1998.  The  Borrower  has the  option to renew the
364-day  Facility  for  another  period  of 364 days by  notifying  the Banks in
writing of such  election  not more than 60 days and not less than 45 days prior
to the maturity date.  The prior credit  agreements of Parker & Parsley and Mesa
were  paid in  full  following  the  Mergers  utilizing  proceeds  from  initial
borrowings under the new Primary Facility.

        Advances  on both  Credit  Facility  Agreements  bear  interest,  at the
Borrower's  option,  based on (a) the prime rate of NationsBank of Texas,  N.A.,
(b) a Eurodollar rate (substantially  equal to the London Interbank Offered Rate
("LIBOR")),  adjusted for the reserve  requirement as determined by the Board of
Governors  of the  Federal  Reserve  System  with  respect  to  transactions  in
Eurocurrency liabilities ("LIBOR Rate"), or (c) a competitive bid rate as quoted
by the Banks  electing to  participate  pursuant  to a request by the  Borrower.
Advances that are LIBOR Rate have periodic maturities, at the Borrower's option,
of one, two, three,  six, nine or twelve months.  Maturities of greater than six
months are subject to  availability  of such  deposits in the relevant  markets.
Advances  that  are  competitive  bid  rate  have  periodic  maturities,  at the
Borrower's option, of not less than 15 days nor more than 360 days. The interest
rates on LIBOR Rate advances  vary with  interest  rate margins  ranging from 18
basis points to 45 basis  points.  The interest  rate margin is  determined by a
grid based upon Pioneer's senior unsecured long-term public debt rating.

        The obligations of the Borrower under the Credit Facility Agreements are
guaranteed by Pioneer and certain of its  subsidiaries  unless and to the extent
any such subsidiary has been designated as an  "Unrestricted  Subsidiary" by the
Borrower pursuant to the Credit Facility Agreements. Certain subsidiaries of the
Borrower which have not been  designated as Unrestricted  Subsidiaries  have not
provided guaranties because either (a) such guaranty would result in adverse tax
consequences  pursuant to Section 956 of the Internal  Revenue Code of 1986,  as
amended, or (b) such subsidiary is prohibited from executing a guaranty pursuant
to  contractual  restrictions.  In these cases,  the Borrower and certain of its
subsidiaries have pledged a portion of the issued and outstanding  capital stock
of such  subsidiaries  as security for the obligations of the Borrower under the
Credit Facility Agreements.

        The Credit Facility Agreements contain various restrictive covenants and
compliance requirements,  which include (a) minimum financial requirements;  (b)
limits on the incurrence of additional indebtedness; (c) limitations on mergers;
and (d) limits on making certain restricted payments.

                                        9

<PAGE>




       As of September 30, 1997 and December 31, 1996,  long-term  debt consists
of the following:
                                                  September 30,   December 31,
                                                      1997            1996
                                                  ------------    -----------
                                                         (in thousands)

 Line of credit.................................. $   713,000     $     9,000
 8-7/8% senior notes due 2005....................     150,000         150,000
 8-1/4% senior notes due 2007 (net of discount)..     149,328         149,277
 10-5/8% senior subordinated notes due 2006
   (including premium)...........................     369,572             -
 11-5/8% senior subordinated notes discount due
   2006 (net of discount)........................     209,481             -
 Fixed rate building loan........................       9,336          10,121
 Other...........................................      11,544           7,891
                                                    ---------      ----------
                                                    1,612,261         326,289
 Less current maturities.........................      11,116           5,381
                                                    ---------      ----------
                                                  $ 1,601,145     $   320,908
                                                   ==========      ==========

        The accompanying Consolidated Statements of Operations for the three and
nine months ended September 30, 1997 include a $1.5 million  after-tax,  noncash
charge for an extraordinary loss on early  extinguishment of debt resulting from
the Mergers.  This  extraordinary  loss  relates to  capitalized  issuance  fees
associated  with Parker & Parsley's  previously  existing  bank credit  facility
which was replaced by the new Credit Facility Agreements for Pioneer.

NOTE E.     Conversion of Subsidiary Preferred Shares to Common Stock

        On July 28, 1997,  Pioneer exercised its right to require each holder of
its 6 1/4% Cumulative  Guaranteed  Monthly Income  Convertible  Preferred Shares
("Preferred Shares") to exchange all Preferred Shares for shares of common stock
of Pioneer.  The Preferred Shares were issued by Parker & Parsley Capital LLC, a
wholly-owned  finance subsidiary of Pioneer, in 1994. On or after April 1, 1997,
Pioneer had the option to exchange the Preferred Shares for Pioneer common stock
at a rate of 1.7778 shares of common stock for each  Preferred  Share,  provided
that, among other conditions,  the closing price of Pioneer common stock equaled
or exceeded 125% of the then applicable  conversion price for the 20 day trading
period before the date of conversion.  Subsequent to April 1, 1997,  125% of the
applicable  conversion  price  equaled  $35.16.  The closing  price of Pioneer's
common  stock for the period  from June 27,  1997 to July 25,  1997  ranged from
$35.38 to $39.50.

        On July 28, 1997,  Pioneer  issued 6.7 million shares of common stock in
exchange for the 3,776,400  Preferred Shares outstanding.  As a result,  Pioneer
will no longer incur interest  expense  associated with the Preferred  Shares of
approximately $12 million per year.

NOTE F.     Commitments and Contingencies

       Legal  Actions.  Pioneer is party to various legal actions  incidental to
its business,  including,  but not limited to, the proceedings  described below.
The majority of these lawsuits primarily involve claims for damages arising from
oil and gas leases and ownership  interest  disputes.  Pioneer believes that the
ultimate  disposition  of these legal  actions will not have a material  adverse
effect  on  Pioneer's  consolidated  financial  position,   liquidity,   capital
resources or future results of operations. Pioneer will continue to evaluate its
litigation matters on a quarter-by-quarter  basis and will adjust its litigation
reserve as appropriate to reflect the then current status of its litigation.

       Pioneer  believes that the costs for compliance with  environmental  laws
and  regulations  have  not and will not have a  material  effect  on  Pioneer's
financial position or results of operations.

Kansas Ad Valorem Tax

        The  Natural  Gas  Policy  Act of 1978  ("NGPA")  allows  a  "severance,
production  or  similar"  tax to be  included  as an add-on,  over and above the
maximum  lawful  price for natural  gas.  Based on a Federal  Energy  Regulatory
Commission  ("FERC")  ruling  that  Kansas ad valorem  tax was such a tax,  Mesa
collected the Kansas ad valorem tax in addition to the otherwise  maximum lawful
price.  The FERC's ruling was appealed to the United States Court of Appeals for
the District of Columbia ("D.C. Circuit"), which held in June 1988 that the FERC
failed to provide a reasoned basis for its findings and remanded the case to the
FERC for further consideration.

                                       10

<PAGE>



        On  December  1,  1993,  the FERC  issued an order  reversing  its prior
ruling,  but limiting the effect of its decision to Kansas ad valorem  taxes for
sales made on or after June 28, 1988.  The FERC  clarified the effective date of
its  decision  by an order  dated May 18,  1994.  The order  clarified  that the
effective date applies to tax bills rendered after June 28, 1988, not sales made
on or after that date.  Numerous  parties  filed appeals on the FERC's action in
the D.C. Circuit.  Various natural gas producers challenged the FERC's orders on
two  grounds:  (1) that the Kansas ad valorem  tax,  properly  understood,  does
qualify for  reimbursement  under the NGPA; and (2) the FERC's ruling should, in
any event, have been applied prospectively.  Other parties challenged the FERC's
orders  on  the  grounds  that  the  FERC's  ruling  should  have  been  applied
retroactively  to December 1, 1978,  the date of the  enactment  of the NGPA and
producers should have been required to pay refunds accordingly.

        The D.C. Circuit issued its decision on August 2, 1996, which holds that
producers  must make refunds of all Kansas ad valorem tax collected with respect
to production  since October 4, 1983 as opposed to June 28, 1988.  Petitions for
rehearing  were  denied on  November  6, 1996.  Various  natural  gas  producers
subsequently  filed a  petition  for writ of  certiori  with the  United  States
Supreme Court  seeking to limit the scope of the potential  refunds to tax bills
rendered on or after June 28, 1988 (the  effective date  originally  selected by
the FERC).  Williams  Natural Gas Company  filed a  cross-petition  for certiori
seeking to impose refund liability back to December 1, 1978. Both petitions were
denied on May 12, 1997.

        Pioneer and other producers filed petitions for adjustment with the FERC
on June 24, 1997. Pioneer is unable at this time to predict the final outcome of
this matter or the amount, if any, that will ultimately be refunded. Pioneer has
a $20  million  provision  recorded  for  such  litigation  in the  accompanying
Consolidated  Balance Sheet at September 30, 1997.  Pioneer is seeking waiver or
set-off from FERC with respect to that portion of the refund associated with (i)
non-recoupable  royalties,  (ii) non-recoupable  Kansas property taxes based, in
part, upon the higher prices collected,  and (iii) interest for all periods.  On
September 10, 1997, FERC denied this request,  and on October 10, 1997,  Pioneer
and other producers filed a request for rehearing.

Masterson

        In February 1992, the current  lessors of an oil and gas lease (the "Gas
Lease")  dated April 30,  1955,  between R.B.  Masterson et al., as lessor,  and
Colorado Interstate Gas Company ("CIG"), as lessee, sued CIG in Federal District
Court in Amarillo,  Texas,  claiming that CIG had underpaid  royalties due under
the Gas Lease. Under the agreements with CIG, Pioneer, as successor to Mesa, has
an entitlement  to gas produced from the Gas Lease.  In August 1992, CIG filed a
third-party  complaint against Pioneer for any such royalty  underpayment  which
may be allocable to Pioneer.  Plaintiffs  alleged that the  underpayment was the
result of CIG's use of an  improper  gas sales  price  upon  which to  calculate
royalties  and that the proper price should have been  determined  pursuant to a
"favored-nations" clause in a July 1, 1967, amendment to the Gas Lease (the "Gas
Lease  Amendment").  The plaintiffs also sought a declaration by the court as to
the proper price to be used for calculating future royalties.

        The plaintiffs  alleged  royalty  underpayments  of  approximately  $500
million  (including  interest at 10%)  covering the period from July 1, 1967, to
the  present.  In March  1995 the  court  made  certain  pretrial  rulings  that
eliminated  approximately  $400 million of the plaintiff's claims (which related
to  periods  prior to  October  1,  1989) , but which  also  reduced a number of
Pioneer's  defenses.  Pioneer and CIG filed  stipulations with the court whereby
Pioneer  would have been liable for between 50% and 60%,  depending  on the time
period  covered,  of an  adverse  judgment  against  CIG or  post-February  1988
underpayments of royalties.

        On March 22,  1995,  a jury  trial  began and on May 4,  1995,  the jury
returned its  verdict.  Among its  findings,  the jury  determined  that CIG had
underpaid  royalties  for the period after  September 30, 1989, in the amount of
approximately    $140,000.    Although   the   plaintiffs    argued   that   the
"favored-nations"  clause  entitled  them to be paid for all of their gas at the
highest price  voluntarily paid by CIG to any other lessor,  the jury determined
that the  plaintiffs  were estopped  from  claiming  that the  "favored-nations"
clause provides for other than a pricing-scheme to pricing-scheme comparison. In
light  of  this   determination,   and  the  plaintiff's   stipulation   that  a
pricing-scheme  to  pricing-scheme  comparison  would not result in any "trigger
prices" or damages,  defendants  asked the court for a judgment that  plaintiffs
take nothing. The court, on June 7, 1995, entered final judgment that plaintiffs
recover no monetary damages. The plaintiffs filed a motion for new trial on June
22, 1995. The court, on July 18, 1997, denied plaintiffs' motion. The plaintiffs
have appealed to the Fifth Circuit.

                                       11

<PAGE>



        On June 7, 1996,  the  plaintiffs  filed a separate suit against CIG and
Pioneer in state court in Amarillo,  Texas,  similarly claiming  underpayment of
royalties under the "favored-nations" clause, but based upon the above-described
pricing-scheme to pricing-scheme comparison on a well-by-well monthly basis. The
plaintiffs also claim  underpayment  of royalties since June 7, 1995,  under the
"favored-nations"  clause based upon either the pricing-scheme to pricing-scheme
method or their previously alleged higher price method.  Pioneer believes it has
several defenses to this action and intends to contest it vigorously. Pioneer is
not currently able to determine the range of reasonably possible losses, if any,
that would be payable if such action was determined adversely to Pioneer.

        The federal court in the above-referenced  first suit issued an order on
July 29, 1996,  which stayed the second suit pending the plaintiffs'  resolution
of the first suit.

        However, based on the jury verdict and final judgment,  Pioneer does not
currently  expect the ultimate  resolution of these  lawsuits to have a material
adverse effect on its financial position or results of operations.

Shareholder Litigation

        On July 3, 1995,  Robert  Strougo  filed a class  action and  derivative
action in the District Court of Dallas County,  Texas,  160th Judicial District,
against T. Boone Pickens,  Paul W. Cain, John L. Cox, John S. Herrington,  Wales
H. Madden, Jr., Fayez S. Sarofim,  Robert L. Stillwell and J. R. Walsh, Jr. (the
"Director  Defendants"),  each of whom was a former  director of Mesa. The class
action was  purportedly  brought on behalf of a class of Mesa  shareholders  and
alleges,  inter alia,  that the Mesa Board infringed upon the suffrage rights of
the class and  impaired  the  ability of the class to receive  tender  offers by
adoption of a shareholder rights plan. The lawsuit was also brought derivatively
on  behalf  of Mesa and  alleges,  inter  alia,  that the  Mesa  Board  breached
fiduciary duties to Mesa by adopting a shareholder rights plan and by failing to
consider the sale of Mesa.  The lawsuit seeks  unspecified  damages,  attorneys'
fees,  and  injunctive  and other  relief.  Two other  lawsuits  filed by Herman
Krangel, Lilian Krangel,  Jacquelyn A. Cady and William S. Montagne, Jr., in the
District  Court of Dallas County have been  consolidated  into this  lawsuit.  A
third lawsuit filed by Deborah M. Eigen and Adele Brody as a derivative  lawsuit
in the U.S. District Court for the Northern District of Texas,  Dallas Division,
intervened in this lawsuit.  In November 1997, the Court dismissed this lawsuit.

NOTE G.     Derivative Financial Instruments

        Commodity hedges.  Pioneer utilizes various swap and option contracts to
(i) reduce  the effect of the  volatility  of price  changes on the  commodities
Pioneer produces and sells,  (ii) support Pioneer's annual capital budgeting and
expenditure  plans and (iii) lock in prices to protect the economics  related to
certain capital projects.

        Crude Oil. All  material  purchase  contracts  governing  Pioneer's  oil
production are tied directly or indirectly to NYMEX prices.  The following table
sets forth Pioneer's  outstanding oil swap contracts and collar option contracts
as of September 30, 1997.
                        First    Second     Third      Fourth
                       Quarter   Quarter   Quarter     Quarter         Total
                       -------   -------   -------   ------------   ------------
Oil production:
 1997 - Swap Contracts
   Volume (MMBbl)          -         -         -               .9             .9
   Price per Bbl       $   -     $   -     $   -     $      18.93   $      18.93

 1997 - Collar Options
   Volume (MMBbl)          -         -         -               .1             .1
   Price per Bbl       $   -     $   -     $   -     $17.82-24.31   $17.82-24.31

 1998 - Swap Contracts
   Volume (MMBbl)           .8        .8        .8             .8            3.2
   Price per Bbl       $ 19.76   $ 19.76   $ 19.75   $      19.74   $      19.75

                                       12

<PAGE>



        Pioneer  reports average oil prices per Bbl including the effects of oil
quality,  gathering  and  transportation  costs  and the net  effect  of the oil
hedges.  During the three and nine months  ended  September  30,  1997,  Pioneer
reported average oil prices of $17.93 per Bbl and $18.70 per Bbl,  respectively,
while  realizing  an  average  price for  physical  oil sales  (excluding  hedge
results)   for  the  same  periods  of  $18.03  per  Bbl  and  $19.37  per  Bbl,
respectively.  The comparable average NYMEX prompt month closing per Bbl for the
three  and  nine  months  ended  September  30,  1997  was  $19.79  and  $20.83,
respectively.  Pioneer  recorded net reductions to oil revenues of $351 thousand
and $6.3  million  for the three  and nine  months  ended  September  30,  1997,
respectively, as a result of its oil price hedges.

        During the three and nine  months  ended  September  30,  1996,  Pioneer
reported  average oil prices per Bbl of $20.34 and $19.62,  respectively,  while
realizing an average price for physical oil sales  (excluding hedge results) for
the same  periods  of  $21.63  per Bbl and  $20.39  per Bbl,  respectively.  The
comparable  average  NYMEX prompt  month  closing per Bbl for the three and nine
months ended  September  30, 1996 was $22.33 and $21.18,  respectively.  Pioneer
recorded net reductions to oil revenues of $3.3 million and $6.4 million for the
three and nine months ended September 30, 1996, respectively, as a result of its
oil price hedges.

        Natural Gas. Pioneer employs a policy of hedging gas production based on
the index  price upon which the gas is actually  sold in order to  mitigate  the
basis risk between  NYMEX prices and actual index prices.  The  following  table
sets forth Pioneer's outstanding gas swap contracts, collar option contracts and
put option contracts as of September 30, 1997.  Prices included herein represent
Pioneer's  weighted average index price per MMBtu for the swap contracts and put
option  contracts  and the  weighted  average  index  price range for the collar
option contracts and, as an additional point of reference,  the weighted average
NYMEX price.
                          First      Second     Third     Fourth
                         Quarter     Quarter   Quarter    Quarter       Total
                        ----------   -------   -------   ----------   ----------
Gas production:
 1997 - Swap Contracts
  Volume (Bcf)                 -         -         -           13.4         13.4
  Index price per MMBtu $      -     $   -     $   -     $     2.18   $     2.18
  NYMEX price per MMBtu $      -     $   -     $   -     $     2.34   $     2.34

 1997 - Collar Options
  Volume (Bcf)                 -         -         -            7.0          7.0
  Index price per MMBtu $      -     $   -     $   -     $2.13-2.67   $2.13-2.67

 1997 - Put Options
  Volume (Bcf)                 -         -         -             .2           .2
  Index price per MMBtu $      -     $   -     $   -     $     2.13   $     2.13

 1998 - Swap Contracts
  Volume (Bcf)                12.6       3.9       2.8          2.4         21.7
  Index price per MMBtu $     2.35   $  1.93   $  1.75   $     1.79   $     2.13
  NYMEX price per MMBtu $     2.48   $  2.22   $  2.22   $     2.22   $     2.39

 1998 - Collar Options
  Volume (Bcf)                 3.6       -         -            -            3.6
  Index price per MMBtu $2.50-3.44   $   -     $   -     $      -     $2.50-3.44

 1998 - Put Options
  Volume (Bcf)                  .3       2.5       3.0          1.1          6.9
  Index price per MMBtu $     2.50   $  1.83   $  1.83   $     1.85   $     2.08

 1999 - Swap Contracts
  Volume (Bcf)                 1.4        .4       -            -            1.8
  Index price per MMBtu $     1.58   $  1.86   $   -     $      -     $     1.65
  NYMEX price per MMBtu $     2.03   $  2.03   $   -     $      -     $     2.03

                                       13

<PAGE>



        In addition to the open  positions  above for the fourth quarter of 1997
and the first  quarter of 1998,  Pioneer  has sold short put options for 2.9 Bcf
and 3.9 Bcf, respectively.  Consequently, there is no effective minimum price to
be realized from the collar and put options if the NYMEX price falls below $2.45
and $2.37, respectively.

        Pioneer  reports average gas prices per Mcf including the effects of Btu
content,  gathering and  transportation  costs, gas processing and shrinkage and
the net  effect  of the gas  hedges.  During  the three  and nine  months  ended
September  30, 1997,  Pioneer  reported  average gas prices of $2.16 per Mcf and
$2.21 per Mcf,  respectively,  while realizing an average price for physical gas
sales  (excluding hedge results) for the same periods of $2.22 per Mcf and $2.32
per Mcf, respectively. The comparable average NYMEX prompt month closing per Mcf
for the three and nine  months  ended  September  30,  1997 was $2.49 and $2.33,
respectively.  Pioneer  recorded net  reductions to gas revenues of $1.8 million
and $7.9  million  for the three  and nine  months  ended  September  30,  1997,
respectively, as a result of its gas price hedges.

        During the three and nine  months  ended  September  30,  1996,  Pioneer
reported  average  gas prices per Mcf of $2.09 and  $2.12,  respectively,  while
realizing an average price for physical gas sales  (excluding hedge results) for
the  same  periods  of  $2.12  per Mcf and  $2.19  per  Mcf,  respectively.  The
comparable  average  NYMEX prompt  month  closing per Mcf for the three and nine
months  ended  September  30,  1996 was $2.17 and $2.33,  respectively.  Pioneer
recorded net  reductions  to gas revenues of $621  thousand and $3.7 million for
the three and nine months ended September 30, 1996, respectively, as a result of
its gas price hedges.

        Natural Gas  Liquids.  Pioneer  employs a policy of hedging  natural gas
liquids  based  on  actual  product  prices  in order  to  mitigate  some of the
volatility  associated  with NYMEX  pricing.  Natural gas liquids are sold under
long-term  contracts  which provide price  flexibility  and allow the company to
maximize prices between trading hubs.

                                 First    Second    Third     Fourth
                                Quarter   Quarter   Quarter   Quarter    Total
                                -------   -------   -------   -------   -------
Natural gas liquids production:
   1997 - Swap Contracts
     Volume (MMBbl)                 -          -         -         .1        .1
     Price per Bbl               $  -      $   -     $   -    $ 16.27   $ 16.27

        During the three and nine  months  ended  September  30,  1997,  Pioneer
reported average natural gas liquids prices of $12.89 per Bbl while realizing an
average price for physical sales (excluding hedge results) of $12.78 per Bbl and
recorded a net increase to natural gas liquids revenue of $124 thousand.

        Fair market value  adjustment.  During  December 1996, Mesa entered into
BTU swap agreements that cover 13,036 MMBTU per day from January 1, 1997 through
December  31,  2004.  The  agreements  require that from January 1, 1997 through
December 31, 1998,  Pioneer will receive a premium of $.52 per MMBTU over market
natural  gas  prices.  During the six year  period of  January  1, 1999  through
December  31,  2004,  Pioneer  will  receive  10% of the NYMEX oil price for the
volumes  covered.  On September  30,  1997,  Pioneer  recorded a  mark-to-market
adjustment to the carrying value of the BTU swap agreements that resulted in the
recognition  of a $2.1  million  noncash  pre-tax  charge to the results for the
third quarter of 1997. These contracts will continue to be  marked-to-market  at
the end of each reporting  period during their  respective lives and the effects
on Pioneer's results of operations in future periods could be significant.

        Interest rate swaps.  During the second quarter of 1996, Pioneer entered
into a series of interest rate swap  agreements for an aggregate  amount of $150
million with four counterparties.  These agreements,  which have a term of three
years,  effectively  convert a portion of Pioneer's  fixed-rate  borrowings into
floating-rate  obligations.  The weighted  average fixed rate being  received by
Pioneer over the term of these  agreements  is 6.62% while the weighted  average
variable rate paid by Pioneer for the three and nine months ended  September 30,
1997 was 5.94% and 5.75%, respectively,  and for the three and nine months ended
September  30, 1996,  the  weighted  average  variable  rate paid by Pioneer was
5.65%.  The variable rate will be  redetermined  approximately  every six months
based upon the London interbank offered rate at that point in time.

        In August 1996,  Mesa entered into an interest rate swap  agreement with
one counterparty for an aggregate amount of $250 million. This agreement,  which
has a term of two years,  effectively  converts a portion of Pioneer's  floating
rate  borrowings  into  fixed-rate  obligations.  The  economic  effect  of this
agreement,  given  Pioneer's  current  interest  rate  on  its  Credit  Facility
Agreements, is to fix the interest rate on $250 million of floating rate debt at
a rate of 6.51%.

                                       14

<PAGE>



        The accompanying Consolidated Statements of Operations for the three and
nine months ended September 30, 1997 include a reduction in interest  expense of
$5 thousand and $705 thousand, respectively, and a reduction in interest expense
of $350 thousand and $461 thousand for the three and nine months ended September
30, 1996, respectively, to account for the settlement of Pioneer's interest rate
swap agreements.

        In October 1997, Pioneer entered into two agreements with a counterparty
designated as forward U.S.  Treasury  interest rate locks.  In such  agreements,
Pioneer  agreed to sell U.S.  Treasury  securities at a designated  point in the
future.  This acts to lock in the interest  rate for  anticipated  future public
debt  issuances by Pioneer  which will be priced  based upon such U.S.  Treasury
securities.  The face amount of the U.S. Treasury  securities which were sold is
$300 million with maturities of the underlying U.S. Treasury  securities ranging
from 10 years to 30 years and the  associated  forward  U.S.  Treasury  interest
rates ranging from 6.00% to 6.30%. Such agreements expire in December 1997.

NOTE H.     Earnings per Share

        In February  1997,  the  Financial  Accounting  Standards  Board  issued
Statement of Financial Accounting Standards No. 128, "Earnings per Share" ("SFAS
128") which simplifies the existing  standards for computing  earnings per share
("EPS")  and makes  them  comparable  to  international  standards.  Pioneer  is
required  to adopt  SFAS 128 in its  year  ended  December  31,  1997  financial
statements  and all prior  period EPS  information  (including  interim  EPS) is
required to be restated at that time.  Early  implementation  is not  permitted.
Under SFAS 128, primary EPS is replaced by "basic" EPS, which excludes  dilution
and is computed by  dividing  income  available  to common  stockholders  by the
weighted average number of common shares  outstanding for the period.  "Diluted"
EPS, which is computed  similarly to fully-diluted  EPS,  reflects the potential
dilution that could occur if securities or other contracts to issue common stock
were  exercised  or  converted  into common stock or resulted in the issuance of
common stock that then shared in the earnings of the entity.

        If Pioneer  had  adopted  SFAS 128 as of the  beginning  of each  period
presented  below,  the  following  basic and diluted EPS amounts would have been
reported:
                                    Three months ended    Nine months ended
                                       September 30,         September 30,
                                    -------------------   ------------------
                                      1997       1996       1997      1996
                                    --------   --------   --------   -------
Income (loss) per share:
  Basic:
     Income (loss) before
       extraordinary item           $  (.18)   $    .59   $    .34   $  3.26
     Extraordinary item                (.03)        -         (.03)      -
                                     ------      ------     ------    ------
     Net income (loss)              $  (.21)   $    .59   $    .31   $  3.26
                                     ======     =======    =======    ======
  Diluted:
     Income (loss) before
       extraordinary item           $  (.18)   $    .54   $    .34   $  2.85
     Extraordinary item                (.03)        -         (.03)      -
                                     ------      ------     ------    ------
     Net income (loss)              $  (.21)   $    .54   $    .31   $  2.85
                                     ======     =======    =======    ======

NOTE I.     Subsequent Events

Acquisition of Chauvco

        On  September  3,  1997,   Pioneer   entered  into  an  agreement   (the
"Combination  Agreement")  to acquire the  Canadian  and  Argentine  oil and gas
business of Chauvco Resources Ltd.  ("Chauvco"),  a publicly traded  independent
oil and gas  company  based in  Calgary,  Canada,  and to  spin-off  to  Chauvco
shareholders  Chauvco's Gabonese oil and gas operations and other  international
interests through Chauvco's existing subsidiary, Chauvco Resources International
Ltd.  ("CRI").  Prior to the  consummation  of this  transaction,  Chauvco  will
distribute its 20% interest in the Alliance Pipeline project. In accordance with
the  Combination  Agreement,  holders of Chauvco  common shares will receive for
each Chauvco common share held (i) one share of CRI and (ii) a number of Pioneer
common shares or shares exchangeable into Pioneer shares ("Exchangeable Shares")
or a combination of both.  The number of Pioneer  common shares or  Exchangeable
shares to be issued is determined by an exchange  ratio which is dependent  upon
the price of Pioneer  common  stock.  The  exchange  ratio for shares of Chauvco
common stock into shares of Pioneer common stock or  Exchangeable  shares varies
between 0.493827 and 0.451467.

                                       15

<PAGE>



        The preliminary aggregate Pioneer purchase  consideration for the assets
and  liabilities to be acquired from Chauvco,  including  estimated  transaction
costs,  is $980.5  million.  The  following  table  represents  the  preliminary
allocation  of the total  purchase  price of Chauvco to the acquired  assets and
liabilities  based  upon the fair  values  assigned  to each of the  significant
assets  acquired  and  liabilities   assumed.  Any  future  adjustments  to  the
allocation of the purchase price are not anticipated to be material to Pioneer's
financial statements.
                                                         Allocation
                                                        of Aggregate
                                                          Purchase
                                                        Consideration
                                                        -------------
                                                        (in thousands)

       Net working capital                               $   (11,123)
       Property, plant and equipment                       1,444,049
       Other assets                                           28,785
       Long-term debt                                       (208,653)
       Other non-current liabilities,
         including deferred taxes                           (272,585)
                                                          ----------
                                                         $   980,473
                                                          ==========
       Pioneer common stock consideration                $   950,473
       Transaction costs                                      30,000
                                                           ---------
       Aggregate purchase consideration                  $   980,473
                                                          ==========
East Texas Basin Assets

        On October 23, 1997,  Pioneer  signed a Purchase  and Sale  Agreement to
acquire  substantial assets in the East Texas Basin from American Cometra,  Inc.
("ACI") and Rockland Pipe Co.  ("Rockland"),  both  subsidiaries  of Electrafina
S.A. of Belgium.  Purchase  consideration  consists of $85 million cash and 1.75
million  shares of Pioneer  common  stock.  Pioneer  will  acquire  all of ACI's
producing wells,  acreage (95,000 gross and 38,000 net), seismic data, royalties
and mineral interests and Rockland's  gathering system,  pipeline and Plum Creek
gas treating  facility.  It is anticipated  that this  transaction will close by
mid-December 1997.

Tender Offer

        On November 14, 1997, Pioneer's wholly-owned subsidiary, Pioneer Natural
Resources USA, Inc.,  formerly known as MOC ("Pioneer USA"),  initiated an offer
to  purchase  for  cash  (the  "Offer")  any  and  all  of its  11  5/8%  senior
subordinated  discount  notes  due 2006 (the "11 5/8%  Notes"),  and its 10 5/8%
senior subordinated notes due 2006 (the "10 5/8% Notes" and together with the 11
5/8% Notes,  the "Notes").  The purchase price offered by Pioneer USA for the 11
5/8% Notes and the 10 5/8% Notes is,  respectively,  $829.90 and  $1,171.40  per
$1,000 face amount tendered, plus any interest on the 10 5/8% Notes accrued from
July 1, 1997 to the expiration date of the Offer. Pioneer USA intends to pay for
the purchase price of the Notes tendered in the Offer with borrowings  under its
Credit  Facility  Agreements.  There  are  currently  outstanding  $264  million
aggregate  face amount of the 11 5/8% Notes (having an aggregate  accreted value
of $168 million as of July 1, 1997), and $325 million aggregate principal amount
of the 10 5/8% Notes.

        In  connection with the Offer,  Pioneer USA is  soliciting consents from
holders of record of the Notes at the close of business on November 14, 1997, to
approve amendments to the respective  indentures governing the Notes which would
eliminate  or  modify  most  of  the  restrictive  covenants  contained  in  the
indentures.  Such  amendments  would  become  effective  upon the closing of the
Offer.  A holder  of more  than 66 2/3% in  aggregate  principal  amount of each
outstanding issue of the Notes has agreed to consent to the proposed amendments,
thereby  assuring  that the proposed  amendments  would become  effective if the
Offer is completed.

        The Offer is expected to expire on December 15, 1997, and the closing of
the Offer is expected to occur three business days after the expiration date. If
the Offer is completed with 100% of the Notes tendered,  Pioneer expects to take
a charge to its fourth  quarter 1997 earnings of $12 million to $15 million (net
of tax benefit).

                                       16

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


Item 2.     Management's Discussion and Analysis of Financial Condition and
               Results of Operations(1)

The Formation of Pioneer

       Pioneer Natural Resources Company  ("Pioneer"),  a Delaware  corporation,
was  formed  by the  merger of Parker & Parsley  Petroleum  Company  ("Parker  &
Parsley")  and MESA Inc.  ("Mesa").  Pioneer is an oil and gas  exploration  and
production  company with ownership  interests in oil and gas properties  located
principally  in the  MidContinent,  Southwestern  and onshore and offshore  Gulf
Coast regions of the United States.

       Prior to the merger,  Parker & Parsley and Mesa,  as separate  companies,
had  complimentary  strategies  which  focused on  enhancing  shareholder  value
through  (i)  maximizing  the  value  of  existing  reserves  through  efficient
operating and marketing practices,  (ii) increasing production from existing oil
and gas  properties  by drilling  low-risk  development  wells,  (iii)  drilling
selective  exploratory wells with significant  production and reserve potential,
(iv) pursuing strategic  acquisitions which either complement the existing asset
base or provide  exploration and exploitation  opportunities and (v) maintaining
financial  flexibility  for  future  exploration,  development  and  acquisition
activities.  The merger  met the  strategic  objectives  of both  companies  and
positioned the newly created Pioneer to continue to pursue these strategies on a
larger scale.

       Combining the physical  assets and  management  teams of Parker & Parsley
and Mesa into Pioneer created a company with a solid  foundation of core assets.
This foundation includes three "crown jewels " (the Hugoton gas field located in
Southwest  Kansas,  the West Panhandle gas field located in the Texas panhandle,
and the Spraberry oil and gas field in West Texas) which provide  consistent and
dependable  production,  cash  flow and  ongoing  development  opportunities;  a
reserve portfolio which is balanced between oil and natural gas liquids and gas;
a portfolio  of  exciting  exploration  opportunities;  and a team of over 1,100
dedicated employees representing the professional disciplines and sciences which
will allow  Pioneer  to  continue  to provide  its  shareholders  with  superior
long-term value.

       In accordance with the provisions of Accounting  Principles Board No. 16,
"Business Combinations", the merger has been accounted for as a purchase of Mesa
by Parker &  Parsley.  As a result,  the  historical  financial  statements  for
Pioneer  are those of  Parker &  Parsley,  and  Pioneer's  financial  statements
present the  addition of Mesa's  assets and  liabilities  as an  acquisition  by
Parker & Parsley in August 1997.  Specifically,  the  accompanying  Consolidated
Statements of Operations and  Consolidated  Statements of Cash Flows include the
financial  results of Mesa  beginning in August  1997.  The  aggregate  purchase
consideration   related  to  the  assets  and  liabilities  of  Mesa,  including
transaction costs, is $990.5 million.

Financial Performance

       Pioneer  reported  a net loss of $12.6  million  ($.21 per share) and net
income of $13.5  million  ($.31 per share) for the three and nine  months  ended
September 30, 1997, respectively, as compared to net income of $21 million ($.58
per share) and $115.8  million  ($3.24 per share) for the same  periods in 1996.
The process of organizationally and operationally combining the two companies to
create  Pioneer  resulted  in $4.3  million of  relocation  expenses  and a $2.3
million  write-off  of  commitment  fees  related to Parker &  Parsley's  credit
facility  that was replaced  with a new Pioneer $1.4  billion  credit  agreement
during the three months ended  September 30, 1997.  The three month period ended
September  30,  1997 was also  negatively  impacted  by an  increase  in noncash
depletion  expense  that  resulted  from  the fair  value  allocated  to  Mesa's
long-lived,  low cost natural gas reserves.  As discussed more fully in "Results
of  Operations"  below,  Pioneer's  financial  performance  during 1997 has been
positively  affected by increases  in oil and gas  production  and  decreases in
production  costs  per BOE due to  ongoing  cost  reduction  efforts,  offset by
increases in exploration and general and administrative expenses and an increase
in interest  expense due to the  additional  debt  assumed  from Mesa.  The nine
months ended September 30, 1996 includes $75.9 million ($2.12 per share) related
to net  after-tax  gains  on  asset  dispositions  primarily  due to the sale of
Pioneer's Australasian subsidiaries.

                                       17

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


       Net cash provided by operating  activities decreased to $54.5 million and
$179.1  million  during the three and nine  months  ended  September  30,  1997,
respectively,  as compared to the net cash  provided by operating  activities of
$68.8 million and $189.4 million for the same periods in 1996.  These  decreases
are  primarily  attributable  to increases  in interest  expense and general and
administrative  expenses  and the payment of certain  liabilities  assumed  from
Mesa,  including  severance  payments made to former Mesa employees,  offset, to
some extent, by cash flows generated by the acquired oil and gas properties from
Mesa.

       Pioneer  strives to maintain its  outstanding  indebtedness at a moderate
level  in order to  provide  sufficient  financial  flexibility  to fund  future
opportunities.  Pioneer's  total book  capitalization  at September 30, 1997 was
$3.3  billion,   consisting  of  total   long-term  debt  of  $1.6  billion  and
stockholders'  equity  of $1.7  billion.  Debt as a  percentage  of  total  book
capitalization  was 48% at September 30, 1997, up from 31% at December 31, 1996.
The increase is primarily due to the total  long-term  debt assumed from Mesa of
$1.2 billion.

1998 Projections

         Pioneer expects to invest $600 million in capital projects during 1998.
This preliminary  capital budget is based on Pioneer's  current  projection that
its 1998  production  will be 72  million  barrels of oil  equivalents  (MMBOE),
versus previous analysts'  estimates of 76 to 80 MMBOE. The capital  expenditure
budget is divided  between  development  ($450  million) and  exploration  ($150
million) activities,  and is expected to result in the drilling of more than 900
wells. Pioneer expects to invest $170 million in West Texas, $150 million in the
Gulf Coast areas, $65 million in Canada, and $85 million in other areas of North
America.  Internationally,  Pioneer  expects to invest $100 million in Argentina
and $30 million in other areas.

         Pioneer's  revised production estimate includes an allowance for delays
in the  deployment of Pioneer's  cash flow caused by the  five-month  process of
merging  Mesa  with  Parker  &  Parsley,   as  well  as  equipment   procurement
difficulties that the entire oil and gas industry is currently experiencing.  In
addition,  Pioneer  has  recently  adopted  a new  strategy  to commit a greater
portion  of its  cash  flow  to  higher  growth  potential  projects,  including
significant 3D seismic  projects,  which will delay immediate oil production and
cash  flow.  Historically,  Mesa and  Parker &  Parsley  had each  spent a small
percentage  of its  respective  capital on  exploration  projects.  Pioneer  now
expects to spend  approximately  25% of its capital on exploration.  The forward
looking  statements  in these  projections,  including  statements  relating  to
capital budget, production,  cash flows and drilling activities are based upon a
number of  assumptions,  among others limited  changes in oil and gas prices and
the accuracy of reserve engineering studies.  These assumptions may prove not to
have been accurate. (1)

Acquisition Activities

Acquisition of Chauvco

       On September 3, 1997, Pioneer entered into an agreement (the "Combination
Agreement")  to acquire  the  Canadian  and  Argentine  oil and gas  business of
Chauvco Resources Ltd.  ("Chauvco"),  a publicly traded  independent oil and gas
company  based in  Calgary,  Canada  and to  spin-off  to  Chauvco  shareholders
Chauvco's  Gabonese oil and gas  operations  and other  international  interests
through Chauvco's  existing  subsidiary,  Chauvco Resources  International  Ltd.
("CRI"). Prior to the consummation of this transaction,  Chauvco will distribute
its 20%  interest in the  Alliance  Pipeline  project.  In  accordance  with the
Combination  Agreement,  holders of Chauvco  common shares will receive for each
Chauvco  common  share  held (i) one share of CRI and (ii) a number  of  Pioneer
common shares or shares exchangeable into Pioneer shares ("Exchangeable Shares")
or a combination of both.  The number of Pioneer  common shares or  Exchangeable
shares to be issued is determined by an exchange  ratio which is dependent  upon
the price of Pioneer  common  stock.  The  exchange  ratio for shares of Chauvco
common stock into shares of Pioneer common stock or  Exchangeable  shares varies
between 0.493827 and 0.451467.

       The  acquisition  of  Chauvco  will  meet  many  of  Pioneer's  strategic
objectives.  In addition to the proved producing assets of Chauvco, Pioneer will
be acquiring a substantial  inventory of unproved oil and gas  properties  which
will provide  Pioneer with many  exploration  opportunities  and  potential  for
significant  reserve  additions.  The  acquisition  of Chauvco  will also reduce
Pioneer's debt to total book capitalization ratio from 48% at September 30, 1997
to an anticipated level of 41% on a pro forma basis at September 30, 1997.

                                       18

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


       Although the acquisition of a portfolio of unproved properties represents
an  exciting   challenge  to  Pioneer's   team  of  engineers,   geologists  and
geophysicists,  such  opportunities  are not without  risk.  U.S.  GAAP requires
periodic evaluation of these costs on a  project-by-project  basis in comparison
to their  estimated  value.  These  evaluations  will be  affected by results of
exploration  activities,  future sales or expiration of all or a portion of such
projects.  If the quantity of proved reserves determined by such evaluations are
not  sufficient to fully recover the cost invested in each project,  Pioneer may
be required to recognize  significant  noncash charges to the earnings of future
periods.  There can be no assurance that economic reserves will be determined to
exist for such projects.

       Board  Recommendation.  The  Pioneer  Board of  Directors  (the  "Pioneer
Board") believes that the terms of the Combination Agreement and the acquisition
of Chauvco are fair to and in the best interest of Pioneer and its stockholders.
Accordingly,  the Pioneer Board has approved the  Combination  Agreement and the
acquisition of Chauvco and recommends that the Pioneer  stockholders approve the
Combination Agreement and the acquisition of Chauvco. The Pioneer Board believes
that  the  acquisition  of  Chauvco  will  have  numerous  benefits,   the  most
significant of which are described below.

       Establishment  of New  Core  Areas.  The  Pioneer  Board  considered  the
opportunities  presented by the  establishment  of two new core areas in western
Canada and  Argentina,  the benefits of owning  Canadian oil and gas reserves in
terms of the long-term  supply and demand  dynamics of the North American energy
markets, the attractive operating climate in Argentina and the similarity of the
reservoir characteristics in Argentina to Pioneer's domestic properties.

       Production Growth. The Pioneer Board considered that the expected oil and
gas production volumes for the Chauvco properties' reinvestment projects and the
net growth in production from the Chauvco  properties will accelerate  Pioneer's
expansion and growth strategies.

       Reserve  Growth  Potential.  The Pioneer Board  considered  the projected
reserves of the Chauvco  properties  based on an evaluation  by its  engineering
staff and  believed  that the  complementary  nature of the two  companies  will
provide  a  strong   foundation   for  growth  that  will  benefit  the  Pioneer
stockholders.

       Accretion to Cash Flow. The Pioneer Board  considered  that the projected
and  future  results  of  the  acquisition  of  Chauvco  will  be  accretive  to
discretionary cash flow by approximately 7% in 1998 and 15% in 1999.

       Improved  Balance Sheet.  Based upon June 30, 1997 financial information,
the  Pioneer  Board  considered  that  upon   consummation  of  the  Combination
Agreement, Pioneer's debt to book capitalization ratio will decrease from 46% to
40%,  which had been set as a target ratio, and that other  credit  ratios  will
approach their targets as well.

       Management.  The Pioneer Board also  considered  the depth and breadth of
management  experience of Guy Turcotte and James Baroffio,  members of Chauvco's
board of  directors,  who have each agreed to serve on the Pioneer  Board if the
acquisition of Chauvco is consummated.  Both of these individuals have extensive
experience and successful track records as builders of oil and gas companies and
operations in foreign lands.

Property Acquisitions

       Cotton  Valley.  In May of  1997,  Pioneer  acquired  a 35%  interest  in
approximately  375,000 acres within the Cotton  Valley  Pinnacle Reef Trend from
Union Pacific  Resources  Company  ("UPRC") for $26.9 million.  Pioneer and UPRC
have signed an  exploration  agreement to jointly  explore and develop this area
located in eastern Texas and plan to begin drilling the first  exploration  well
before the end of the year.

       On October 27,  1997,  Pioneer  signed a Purchase  and Sale  Agreement to
acquire  substantial assets in the East Texas Basin from American Cometra,  Inc.
("ACI") and Rockland Pipe Co.  ("Rockland"),  both  subsidiaries  of Electrafina
S.A. of Belgium.  Purchase  consideration  consists of $85 million cash and 1.75
million  shares of Pioneer  common  stock.  Pioneer  will  acquire  all of ACI's
producing wells,  acreage (95,000 gross and 38,000 net), seismic data, royalties
and mineral interests and Rockland's  gathering system,  pipeline and Plum Creek
gas treating facility. The acquired acreage is in Henderson, Freestone, Anderson

                                       19

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


and Leon counties.  The acquired wells are currently producing  approximately 25
MMcf per day and have significant  upside potential with the planned drilling of
additional  wells.  It is  anticipated  that  this  transaction  will  close  by
mid-December 1997.

       These two  acquisitions  combined  will make  Pioneer  one of the largest
acreage  holders in the East Texas Basin with total  holdings  of 650,000  gross
acres  (175,000  net).  Having  gained such  holdings,  Pioneer is  anticipating
developing these assets into a new core area.

       Maude Traylor.  In addition,  Pioneer's Gulf Coast Division completed the
acquisition of a majority interest in the Maude Traylor field in Calhoun County,
Texas  for  approximately  $8.8  million  in  February  1997.  This  acquisition
represented an average working interest of 87% in approximately  1,840 acres and
five wells which  produce from the upper and lower Frio  formations.  Pioneer is
currently  realizing gross gas production of 1.7 MMcf per day in this field, and
since Pioneer  assumed  operations the gross oil  production  rate has more than
tripled to 185 Bbls per day. The Gulf Coast Division is currently  completing an
exploratory  well in the Maude  Traylor field in the Deep Frio  formation  which
should be producing by  year-end.  Pioneer  anticipates  that  recently  upsized
mainline gas production piping will yield an increase in production in this area
of  approximately  5%. Pioneer plans to drill three additional wells during 1997
and  five  wells  in  1998  on  this  acreage  utilizing  existing  3-D  seismic
information.

       Guatemala. During May of 1997, Pioneer finalized negotiations with Triton
Energy for a 40% working interest in a joint  exploration  program of two blocks
in Guatemala's South Peten Basin. Drilling on the Piedras Blancas #1 is expected
to be completed by the end of the year at an estimated  total cost to Pioneer of
$3.7 million.

Drilling Activities

       Pioneer's  1997  capital  expenditure  budget has been  increased to $541
million from its initial budget of $270 million, reflecting planned expenditures
of $240  million  for  exploitation  activities,  $89  million  for  exploration
activities and $212 million for oil and gas property  acquisitions  in Pioneer's
core areas.  For the nine months ended  September 30, 1997,  costs incurred were
$267.3 million. During the first three quarters of 1997, Pioneer participated in
the completion of 413 gross  exploration  and development  wells,  including 239
wells in the Spraberry Division,  85 wells in the Permian Division,  43 wells in
the Gulf Coast Division,  40 wells in the MidContinent Division and six wells in
Argentina.  Of these wells,  76 were in progress at December  31,  1996.  Of the
total wells completed during the nine months ended September 30, 1997, 371 wells
were completed successfully which resulted in a 90% success rate. In addition to
the wells  completed in the first three quarters of 1997,  Pioneer had 138 wells
in progress at September 30, 1997. In total during 1997,  Pioneer plans to drill
approximately  610  development  wells and 90  exploratory  wells and to perform
recompletions on over 150 wells.

       During February 1997, the Texas Railroad  Commission (which regulates oil
and gas production in Texas) entered a favorable order on Pioneer's  application
to allow  administrative  approval of uncontested  applications  to increase the
density of the drilling in the Spraberry field from one well per 80 acres to one
well per 40 acres.  Pioneer  believes such reduced spacing may provide in excess
of 1,000  additional  drilling  locations  which  have the  potential  to add 70
million  equivalent  barrels to Pioneer's proved reserve base. Through September
30, 1997, the Spraberry  Division has drilled 40 wells under the reduced spacing
requirements  resulting in the addition of approximately  three million BOE's to
its reserve portfolio.  Additional drilling is planned for the fourth quarter of
1997 and during  fiscal  1998 that  should  add  additional  BOE's to  Pioneer's
reserve base. Future plans for the Spraberry Division include the implementation
of a field  demonstration  CO2  pilot in 1998 and a 3-D  seismic  study of a 100
square mile area under the major Spraberry  units looking for Strawn,  Atoka and
Devonian structures.

       Pioneer continues to develop the War-Wink field discovery in the Delaware
Basin.  The Permian  Division is currently  drilling two wells and  completing a
third  well in this  field  with  plans  to  drill an  additional  six  wells by
year-end.  Average daily gross  production  from the eight wells  producing from
this  formation  is up to a total of 1,547  Bbls of oil (580 Bbls net) and 1,723
Mcf of gas (650 Mcf net).

                                       20

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


Other Events

       Asset  Dispositions.  For the  nine  months  ended  September  30,  1997,
Pioneer's asset disposition  activity primarily consisted of the sale of certain
domestic  assets for proceeds of $11.2 million,  which resulted in a net gain of
$2.0 million and the sale of Pioneer's  subsidiary with an ownership interest in
oil and gas properties in Turkey for proceeds of $1.6 million, which resulted in
the  recognition  of a gain of $725  thousand.  During  the  nine  months  ended
September 30, 1996, Pioneer sold certain wholly-owned  Australasian subsidiaries
for proceeds of $183.1 million  resulting in a pre-tax gain of $83.2 million and
certain nonstrategic domestic assets for proceeds of $51.2 million that resulted
in the recognition of a pre-tax net gain of $13.7 million.

       During the fourth quarter of 1997,  Pioneer  anticipates  selling certain
nonstrategic domestic oil and gas properties for approximately $100 million.

       Conversion of Subsidiary  Preferred  Shares to Common Stock.  On July 28,
1997,  Pioneer  exercised  its  right  to  require  each  holder  of  its 6 1/4%
Cumulative  Guaranteed Monthly Income  Convertible  Preferred Shares ("Preferred
Shares") to exchange all Preferred  Shares for shares of common stock of Pioneer
(see Note E of Notes to Consolidated Financial  Statements included in  "Item 1.
Financial  Statements").  On July 28, 1997, Pioneer issued 6.7 million shares of
common stock in exchange for the 3,776,400  Preferred Shares  outstanding.  As a
result,  Pioneer  will no longer  incur  interest  expense  associated  with the
Preferred Shares of approximately $12 million per year.

       Earnings per Share. In February 1997, the Financial  Accounting Standards
Board  ("FASB")  issued  Statement of  Financial  Accounting  Standards  No. 128
"Earnings per Share" ("SFAS 128") which  simplifies  the existing  standards for
computing  earnings per share ("EPS") and makes them comparable to international
standards. Pioneer does not anticipate that its EPS as calculated under SFAS 128
will differ significantly from its existing disclosures.  See Note H of Notes to
Consolidated Financial Statements included in "Item 1. Financial Statements" for
pro forma EPS amounts for the three and nine months ended September 30, 1997 and
1996.

       Reporting  Comprehensive  Income. In June 1997, the FASB issued Statement
of Financial  Accounting  Standards  No. 130  "Reporting  Comprehensive  Income"
("SFAS  130")  which   establishes   standards  for  reporting  and  display  of
comprehensive  income  and  its  components  in a full  set  of  general-purpose
financial  statements.  Specifically,  SFAS 130 requires that an enterprise  (i)
classify  items of other  comprehensive  income by their  nature in a  financial
statement and (ii) display the accumulated balance of other comprehensive income
separately from retained  earnings and additional  paid-in capital in the equity
section of a statement of financial  position.  This  statement is effective for
fiscal years beginning after December 15, 1997.

       Comprehensive  income  consists  of the  change in  equity of a  business
enterprise  during a period from transactions and other events and circumstances
from  nonowner  sources.  Specifically,  this  includes  net  income  and  other
comprehensive  income,  which  is made  up of  certain  changes  in  assets  and
liabilities  that are not reported in a statement of operations but are included
in the  balances  within a  separate  component  of  equity  in a  statement  of
financial  position.  Such changes include,  but are not limited to,  unrealized
gains  for  marketable   securities  and  future  contracts,   foreign  currency
translation adjustments and minimum pension liability adjustments.

       Segment  Reporting.  In June 1997, the FASB issued Statement of Financial
Accounting  Standards No. 131  "Disclosures  about Segments of an Enterprise and
Related  Information"  ("SFAS  131")  which  establishes  standards  for  public
business  enterprises  for reporting  information  about  operating  segments in
annual financial  statements and requires that such enterprises  report selected
information  about  operating  segments in interim  financial  reports issued to
shareholders.  This statement also establishes standards for related disclosures
about products and services,  geographic areas, and major customers. SFAS 131 is
effective for financial  statements  for periods  beginning  after  December 15,
1997.

       Pioneer  operates in the one product  line of oil and gas  production  in
limited geographic areas. This information and information about major customers
historically has been disclosed in Pioneer's annual financial statements.

                                       21

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


 Results of Operations

       A merger  between  two  companies  the size of Mesa and  Parker & Parsley
requires certain financial  reporting changes to conform the accounting policies
of the two companies to a consistent methodology. Two of these changes which are
apparent in the results of operations are the  accounting  treatment for natural
gas liquids revenues and the results of operations of the natural gas processing
facilities.  See "Oil and Gas  Revenues",  "Production  Costs" and  "Natural Gas
Processing" below for further discussion.

Oil and Gas Production.
                                   Three months ended       Nine months ended
                                     September 30,            September 30,
                                  ---------------------   ---------------------
                                    1997        1996        1997         1996
                                  ---------   ---------   ---------   ---------
                                     (in thousands, except per unit amounts)
Revenues:
   Oil and gas                    $ 150,354   $  91,313   $ 348,980   $ 283,327
   Gain on disposition of oil
     and gas properties, net (a)         (3)        186       1,068       7,939
                                   --------    --------    --------    --------
                                    150,351      91,499     350,048     291,266
                                   --------    --------    --------    --------
Costs and expenses:
   Oil and gas production           (42,003)    (24,829)    (91,674)    (82,233)
   Depletion                        (65,132)    (24,284)   (121,302)    (79,057)
   Exploration and abandonments      (8,442)     (2,163)    (20,073)     (7,187)
   Geological and geophysical        (7,071)     (1,600)    (14,237)     (6,451)
                                   --------    --------    --------    --------
                                   (122,648)    (52,876)   (247,286)   (174,928)
                                   --------    --------    --------    --------
    Operating profit (excluding
      general and administrative
      expenses and income taxes)  $  27,703   $  38,623   $ 102,762   $ 116,338
                                   ========    ========    ========    ========
- ---------------

(a)  The 1997  amounts do not include  the gain  related to the  disposition  of
     Pioneer's  subsidiary  which owned an interest in oil and gas properties in
     Turkey. The 1996 amounts do not include the gain related to the disposition
     of certain of Pioneer's wholly-owned Australasian subsidiaries.

   Production:
     Oil (MBbls)                      3,672       2,577       9,425       8,297
     Gas (MMcf)                      32,327      18,630      71,284      56,825
     Natural gas liquids (MBbls)      1,151         -         1,151         -
     Total (MBOE)                    10,211       5,682      22,457      17,768
   Average daily production:
     Oil (Bbls)                      39,912      28,008      34,525      30,282
     Gas (Mcf)                      351,384     202,497     261,113     207,392
     Natural gas liquids (Bbls)      12,506         -         4,214         -
   Average oil price (per Bbl)    $   17.93   $   20.34   $   18.70   $   19.62
   Average gas price (per Mcf)         2.16        2.09        2.21        2.12
   Average NGL price (per Bbl)        12.89         -         12.89         -
   Costs (per BOE):
     Lease operating expense      $    3.11   $    3.32   $    2.94   $    3.51
     Production taxes             $     .78   $     .91   $     .85   $     .83
     Workover costs               $     .22   $     .14   $     .29   $     .29
                                   --------    --------    --------    --------
        Total production costs    $    4.11   $    4.37   $    4.08   $    4.63
                                   ========    ========    ========    ========
     Depletion                    $    6.38   $    4.27   $    5.40   $    4.45


                                       22

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)



        Oil and Gas Revenues. Revenues from oil and gas operations increased 23%
during the nine  months  ended  September  30,  1997 to $349  million and 65% to
$150.4 million during the three months ended  September 30, 1997, as compared to
$283.3  million and $91.3 million  during the same periods in 1996. The increase
during the three and nine months ended  September  30, 1997 is primarily  due to
increases  in oil and gas  production  and an  increase in the average gas price
received,  offset by a decrease in the average price received per barrel of oil.
The majority of the  increased  production is a direct result of the oil and gas
properties acquired from Mesa.

        Parker &  Parsley  historically  accounted  for  processed  natural  gas
production as wellhead  production  on a wet gas basis while Mesa  accounted for
processed natural gas production in two components:  natural gas liquids and dry
residue gas. The combined  entities own three major gas  processing  facilities,
and the majority of the gas  processed by these  facilities  is owned by Pioneer
and produced by Pioneer operated properties.  Consequently, Pioneer now produces
a higher  proportion of processed  gas relative to total natural gas  production
and will account for natural gas production as processed natural gas liquids and
dry residue gas. As a result,  separate  product  volumes will not be comparable
for periods prior to September 30, 1997.

        On a BOE basis,  production  increased  by 80% and 26% for the three and
nine months ended  September  30, 1997, as compared to the same periods in 1996.
The additional  production volumes from the Mesa properties  contributed 71% and
22% to the  growth  for the three and nine  months  ended  September  30,  1997,
respectively.  The  remainder  of  the  increases  are a  direct  result  of the
successes of Pioneer's  exploration and  exploitation  efforts.  Such production
growth becomes  particularly  evident in light of the fact that a portion of the
average daily oil and gas  production  for the first nine months of 1996 related
to properties included in the 1996 sale of Pioneer's  Australasian  subsidiaries
and the 1996 sale of certain nonstrategic domestic assets.  Excluding production
associated  with assets sold  during  1996 and the Mesa  properties  acquired in
1997,  on a BOE basis,  production  increased 10% and 13% for the three and nine
months ended September 30, 1997 as compared to the same periods in 1996.

        The  average oil prices  received  per Bbl for the three and nine months
ended September 30, 1997 decreased 12% and 5% as compared to the same periods in
1996, respectively, from $20.34 during the three months ended September 30, 1996
to $17.93  during the same  period  ended 1997 and from $19.62 to $18.70 for the
nine months  ended  September  30,  1996 and 1997,  respectively.  However,  the
average gas price  received  per Mcf  increased 3% during the three months ended
September  30, 1997 to $2.16 from $2.09 during the three months ended  September
30, 1996 and 4% from $2.12 to $2.21 for the nine months ended September 30, 1996
and 1997,  respectively.  Natural gas liquids prices per barrel  averaged $12.89
during the three and nine months ended September 30, 1997.

        Hedging Activities

        The oil and gas  prices  that  Pioneer  reports  are based on the market
price received for the commodities  adjusted by the results of Pioneer's hedging
activities.  Pioneer utilizes commodity derivative contracts (swaps, futures and
options) in order to (i) reduce the effect of the volatility of price changes on
the  commodities  Pioneer  produces  and sells,  (ii) support  Pioneer's  annual
capital  budgeting and expenditure plans and (iii) lock in prices to protect the
economics related to certain capital projects.

        Crude Oil. All  material  purchase  contracts  governing  Pioneer's  oil
production  are tied directly or  indirectly  to NYMEX  prices.  The average oil
price  per Bbl  that  Pioneer  reports  includes  the  effects  of oil  quality,
gathering  and  transportation  costs  and the  net  effect  of the oil  hedges.
Pioneer's  average  realized  price  for  physical  oil sales  (excluding  hedge
results) for the three and nine months ended  September  30, 1997 was $18.03 per
Bbl and  $19.37  per Bbl,  respectively,  while,  as a point of  reference,  the
comparable  average  NYMEX prompt month closing per Bbl for the same periods was
$19.79 and $20.83, respectively. Pioneer recorded net reductions to oil revenues
of $351 thousand and $6.3 million for the three and nine months ended  September
30, 1997, respectively, as a result of its oil price hedges.

        During the three and nine  months  ended  September  30,  1996,  Pioneer
realized an average price for physical oil sales  (excluding  hedge  results) of
$21.63 per Bbl and $20.39 per Bbl, respectively, while, as a point of reference,
the  comparable  average NYMEX prompt month closing per Bbl for the same periods
was $22.33 and $21.18, respectively.

                                       23

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


Pioneer recorded net reductions to oil revenues of $3.3 million and $6.4 million
for the three and nine months  ended  September  30,  1996,  respectively,  as a
result of its oil price hedges.

        Natural Gas. Pioneer employs a policy of hedging gas production based on
the index  price upon which the gas is actually  sold in order to  mitigate  the
basis risk between NYMEX prices and actual index  prices.  The average gas price
per Mcf that Pioneer reports includes the effects of Btu content,  gathering and
transportation costs, gas processing and shrinkage and the net effect of the gas
hedges. Pioneer's average realized price for physical gas sales (excluding hedge
results)  for the three and nine months ended  September  30, 1997 was $2.22 per
Mcf and  $2.32  per  Mcf,  respectively,  while  as a point  of  reference,  the
comparable  average  NYMEX prompt month closing per Mcf for the same periods was
$2.49 and $2.33,  respectively.  Pioneer recorded net reductions to gas revenues
of $1.8 million and $7.9  million for the three and nine months ended  September
30, 1997, respectively, as a result of its gas price hedges.

        During the three and nine  months  ended  September  30,  1996,  Pioneer
realized an average price for physical gas sales  (excluding  hedge  results) of
$2.12 per Mcf and $2.19 per Mcf,  respectively,  while as a point of  reference,
the  comparable  average NYMEX prompt month closing per Mcf for the same periods
was $2.17 and  $2.33,  respectively.  Pioneer  recorded  net  reductions  to gas
revenues of $621  thousand  and $3.7 million for the three and nine months ended
September 30, 1996, respectively, as a result of its gas price hedges.

        Natural Gas  Liquids.  Pioneer  employs a policy of hedging  natural gas
liquids  based  on  actual  product  prices  in order  to  mitigate  some of the
volatility  associated  with NYMEX  pricing.  Natural gas liquids are sold under
long-term  contracts  which provide price  flexibility  and allow the company to
maximize  prices  between  trading hubs.  During the three and nine months ended
September 30, 1997,  Pioneer  realized an average  natural gas liquids price for
physical  sales  (excluding  hedge results) of $12.78 per Bbl and recorded a net
increase to natural gas liquids revenue of $124 thousand.

        See Note G of Notes to  Consolidated  Financial  Statements  included in
"Item 1. Financial  Statements" for information  concerning Pioneer's open hedge
positions at September 30, 1997 and the related prices to be realized.

        During  December 1996,  Mesa entered into BTU swap agreements that cover
13,036  MMBTU per day from  January  1, 1997  through  December  31,  2004.  The
agreements  require that from January 1, 1997 through December 31, 1998, Pioneer
will receive a premium of $.52 per MMBTU over market natural gas prices.  During
the six year period of January 1, 1999 through  December 31, 2004,  Pioneer will
receive 10% of the NYMEX oil price for the volumes  covered.  On  September  30,
1997, Pioneer recorded a mark-to-market  adjustment to the carrying value of the
BTU swap  agreements  that resulted in the recognition of a $2.1 million noncash
pre-tax charge to the results of the third quarter of 1997. These contracts will
continue to be marked-to-market at the end of each reporting period during their
respective  lives and the effects on Pioneer's  results of  operations in future
periods could be significant.

        Production Costs.  While total production costs per BOE decreased 12% to
$4.08 during the nine months ended  September 30, 1997 as compared to production
costs per BOE of $4.63 during the same period in 1996, the primary  component of
production costs, lease operating expense,  decreased 16% from $3.51 per BOE for
the nine months ended September 30, 1996 to $2.94 per BOE for the same period in
1997.  During the three months ended September 30, 1997 production costs per BOE
decreased  6% to $4.11 from $4.37  during the same period in 1996.  As discussed
more fully in "Natural Gas Processing"  below,  Pioneer has adopted a new method
of reporting the financial results of its natural gas processing  facilities and
is now presenting these results as oil and gas production  activities.  In 1997,
the operating  margin from  Pioneer's gas plants (i.e.,  third party  processing
revenues  less  processing  costs  and  expenses)  is  included  in oil  and gas
production  costs,  specifically  lease operating  expense,  which resulted in a
decrease in lease  operating  expense per BOE of $.26 and $.37 for the three and
nine months ended September 30, 1997, respectively. The additional reductions in
lease  operating  expense  during the nine months ended  September  30, 1997 are
primarily  due to  Pioneer's  concentrated  efforts to  evaluate  and reduce all
operating  costs and the sale of certain high operating cost  properties  during
1996.

                                       24

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


        Depletion  Expense.  Depletion  expense per BOE  increased  to $6.38 and
$5.40 during the three and nine months ended  September 30, 1997,  respectively,
as compared to $4.27 per BOE and $4.45 per BOE during the same  periods in 1996.
The increase is  primarily  associated  with the fair value  allocated to Mesa's
long-lived, low cost natural gas reserves.

        Exploration   and   Abandonments/Geological   and   Geophysical   Costs.
Exploration and abandonments/geological and geophysical costs increased to $15.5
million and $34.3 million  during the three and nine months ended  September 30,
1997,  respectively,  from  $3.8  million  and  $13.6  million  during  the same
respective  periods in 1996.  The  increase is largely  the result of  increased
domestic activity,  both in exploratory  drilling and geological and geophysical
activity, resulting from Pioneer's increased exploration activities.  During the
nine months ended  September 30, 1997, the domestic  exploratory  dry hole costs
were primarily  related to 16 unsuccessful  exploratory  wells in the Gulf Coast
Division,  12 unsuccessful  exploratory  wells in the Permian Division and seven
unsuccessful  wells  in the  MidContinent  Division,  at a total  cost of  $11.7
million,  $2.2 million and $2.2 million,  respectively,  and additional costs of
approximately  $830 thousand  associated  with wells which were determined to be
unsuccessful in 1996. The following table sets forth the components of Pioneer's
1997 and 1996 expense for the three and nine months ended September 30, 1997:

                                         Three months           Nine months
                                      ended September 30,   ended September 30,
                                      -------------------   -------------------
                                        1997       1996       1997       1996
                                      --------   --------   --------   --------
                                                    (in thousands)
    Exploratory dry holes:
      United States                   $  7,184   $  1,012   $ 16,885   $  1,736
      Foreign                               34        201        253        781
    Geological and geophysical costs:
      United States                      5,900      1,413     11,690      4,712
      Foreign                            1,171        187      2,547      1,739
    Leasehold abandonments and other     1,224        950      2,935      4,670
                                       -------    -------    -------    -------

                                      $ 15,513   $  3,763   $ 34,310   $ 13,638
                                       =======    =======    =======    ========

        Approximately  16% of  Pioneer's  1997  capital  budget will be spent on
exploratory  projects  (compared  to  16.7%  in 1996 and  13.3%  in  1995).  The
remainder of Pioneer's 1997 exploration efforts will be concentrated in the Gulf
Coast Division, the Permian Division, the MidContinent Division, Pioneer's newly
acquired  interests  in the  Cotton  Valley  Reef  Trend  and its  interests  in
Guatemala. Pioneer continues to review opportunities involving exploration joint
ventures in domestic or  international  areas  outside  Pioneer's  existing core
operating areas.

  Natural Gas Processing

        Pioneer  historically  has  reflected  its  ownership  interests  in and
revenues  and  expenses  related to its natural  gas  processing  facilities  as
separate  items in the  consolidated  financial  statements  while Mesa reported
revenues and expenses from its natural gas processing  facilities as oil and gas
production costs. During the last four years,  Pioneer has sold its interests in
12 natural gas processing  facilities and now owns interests in five  facilities
which  collectively  process an  insignificant  volume of third  party gas.  The
ownership interest in the remaining gas plant facilities and the related results
of  operations  are not material to  Pioneer's  financial  position.  Due to the
immateriality  of the  remaining  facilities  and to report  the  results of gas
processing activities consistently within the financial statements, during 1997,
Pioneer  reclassified  the natural gas  processing  facilities  into oil and gas
properties  for  financial  statement  purposes  and will report all third party
revenues and expenses from its natural gas processing  facilities in oil and gas
production costs.

        Natural gas processing  revenues were $5.7 million and $16.8 million for
the three and nine months ended  September 30, 1996,  respectively,  and natural
gas processing costs for the three and nine months ended September 30, 1996 were
$3.1 million and $9.1 million,  respectively. The average price per Bbl of NGL's
was  $14.79  per Bbl and  $13.77  per Bbl for the  three and nine  months  ended
September 30, 1996,  respectively,  and the average price per Mcf of residue gas
was $2.03 and $2.02 during the three and nine months ended  September  30, 1996,
respectively.

                                       25

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)



        During the nine months  ended  September  30, 1996,  Pioneer  recognized
noncash  pre-tax  charges of $1.3 million  related to abandonments of certain of
Pioneer's  gas  processing  facilities  and  the  cancellation  of  certain  gas
processing contracts.

  General and Administrative Expense

        General and  administrative  expense was $16.8 million and $31.8 million
for the three  and nine  months  ended  September  30,  1997,  respectively,  as
compared to $6.4  million and $19.4  million for the three and nine months ended
September 30, 1996, respectively. Aside from the additional costs resulting from
Pioneer's substantial growth in size, the increase for both periods is primarily
due to  $4.3  million  of  relocation  expenses  in the  third  quarter  of 1997
associated with moving Pioneer's corporate  headquarters from Midland,  Texas to
Dallas, Texas.

  Interest Expense

        During the three  months ended  September  30,  1997,  interest  expense
totaled  $24.1  million,  up from $10.1  million for the third  quarter of 1996.
Interest expense for the nine months ended September 30, 1997 increased to $44.3
million as compared to $36.1 million for the same period in 1996.  The increases
are primarily due to increases in the weighted  average  outstanding  balance of
Pioneer's  indebtedness  of $654.5  million and $118.8 million for the three and
nine months  ended  September  30, 1997,  respectively,  as compared to the same
periods in 1996. The increases in Pioneer's  weighted average  indebtedness were
primarily  the result of the debt  instruments  assumed from Mesa,  including 10
5/8%  and 11  5/8%  senior  subordinated  note  issuances  and  additional  bank
indebtedness,  which are included in Pioneer' indebtedness for the two months of
August and  September  1997.  The weighted  average  interest  rate on Pioneer's
indebtedness  during the three  months  ended  September  30,  1997 was 8.22% as
compared to the rate of 7.86% for the same period in 1996,  and the rate for the
nine months ended September 30, 1997 was 8.05% as compared to 7.82% for the same
period in 1996.

        During the three and nine  months  ended  September  30,  1997,  Pioneer
recorded a reduction  in  interest  expense of $5  thousand  and $705  thousand,
respectively,  related to interest rate swap agreements. During the same periods
in 1996,  such  agreements  resulted in reductions  in interest  expense of $350
thousand and $461 thousand,  respectively.  See Note G of Notes to  Consolidated
Financial Statements included in "Item 1. Financial  Statements" for information
concerning the fixed and variable interest rates in effect during these periods.

  Income Taxes

        Pioneer's income tax benefit of $6 million and provision of $8.5 million
for the three and nine  months  ended  September  30,  1997,  respectively,  and
provisions  of $15.5 and $47.2  million  for the  three  and nine  months  ended
September 30, 1996, respectively, reflect the net benefit or provision resulting
from the separate tax  calculation  prepared for each tax  jurisdiction in which
Pioneer is subject to income taxes.

  Capital Commitments, Capital Resources and Liquidity

        Capital   Commitments.   Pioneer's   primary  needs  for  cash  are  for
exploration,  development and acquisitions of oil and gas properties,  repayment
of  principal  and  interest on  outstanding  indebtedness  and working  capital
obligations.

        Pioneer's cash  expenditures  during the nine months ended September 30,
1997 for additions to oil and gas properties totaled $246.6 million. This amount
includes $36.5 million for the  acquisition of properties and $210.1 million for
development and exploratory drilling.  Pioneer's  acquisition  activities during
the nine months  ended  September  30,  1997  primarily  consisted  of (i) a 35%
interest in  approximately  375,000  acres  within the Cotton  Valley Reef Trend
acquired from UPRC for $26.9 million  funded by $11.1 million in cash and a note
payable  to UPRC of $15.8  million  and  (ii) an 87%  average  working  interest
acquired in the Maude Traylor field in Calhoun County,  Texas for  approximately
$8.8  million.  Significant  drilling  expenditures  in the  nine  months  ended
September  30,  1997  included  $77.8  million  in the  unitized  portion of the
Spraberry field  of the  Permian  Basin  (including  $35.5 million in the Driver

                                       26

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


unit,  $12.0 million in the North Pembrook  unit,  $10.3 million in the Merchant
unit, $9.4 million in the Preston unit, $7.3 million in the Shackelford unit and
$3.3  million in the  Midkiff  unit),  $11.7  million in other  portions  of the
Spraberry field,  $50.3 million in the onshore Gulf Coast region,  $33.8 million
in other areas of the Permian Basin,  $22.3 million in the MidContinent  region,
$6.8 million in the acquired Mesa properties and $7.4 million internationally in
Argentina and Guatemala.

        Pioneer's  1997 capital  expenditure  budget has been  increased to $541
million from its initial budget of $270 million, reflecting planned expenditures
of $240  million  for  exploitation  activities,  $89  million  for  exploration
activities and $212 million for oil and gas property  acquisitions  in Pioneer's
core  areas.  The  significant  increase in the  capital  expenditure  budget is
indicative  of  the  increased   exploration,   exploitation   and   acquisition
opportunities  available to Pioneer.  Funding for Pioneer's capital  expenditure
budget  will  be  primarily  provided  by  cash  flows  generated  by  operating
activities and by proceeds resulting from Pioneer's ongoing  divestiture program
for nonstrategic  assets . In addition,  Pioneer may borrow funds under its $1.4
billion bank facility in order to fund these commitments to the extent that they
exceed such internally-generated cash flows.

        Funding  for  Pioneer's  working  capital  obligations  is  provided  by
internally-generated  cash flows.  Funding for the  repayment of  principal  and
interest  on   outstanding   debt  may  be  provided  by  any   combination   of
internally-generated  cash flows,  proceeds from the disposition of nonstrategic
assets or  alternative  financing  sources as discussed  in "Capital  Resources"
below.

        Capital  Resources.  Pioneer's  primary  capital  resources are net cash
provided  by  operating  activities,  proceeds  from  financing  activities  and
proceeds from sales of nonstrategic assets. Pioneer expects that these resources
will be sufficient to fund its capital commitments in 1997.

        Operating  Activities.  Net cash  provided by operating  activities  was
$54.5  million  and  $179.1  million  during  the  three and nine  months  ended
September 30, 1997, respectively,  as compared to net cash provided by operating
activities of $68.8 million and $189.4 million for the same periods in 1996. The
decreases  during both  periods  are  primarily  attributable  to  increases  in
interest  and general  and  administrative  expenses  and the payment of certain
liabilities assumed from Mesa,  including severance payments made to former Mesa
employees,  offset,  to some extent, by cash flows generated by the acquired oil
and gas properties from Mesa.

        Financing  Activities.  As  described  more  fully in Note D of Notes to
Consolidated Financial Statements included in "Item 1. Financial Statements", on
August 7, 1997,  Pioneer  entered  into two credit  facility  agreements  with a
syndicate  of banks  which  provide  for a total bank  credit  facility  of $1.4
billion. Pioneer had an outstanding balance under its bank facility at September
30, 1997 of $743.6 million (including outstanding,  undrawn letters of credit of
$30.6 million),  leaving  approximately  $656.4 million of unused borrowing base
immediately available. At September 30, 1997, Pioneer has four other outstanding
debt  issuances.  Such debt  issuances  consist  of (i) $150  million  aggregate
principal  amount of 8 7/8% senior  notes issued by Parker & Parsley in 1995 and
due in 2005  (carrying  value of $150.0  million),  (ii) $150 million  aggregate
principal  amount of 8 1/4% senior  notes issued by Parker & Parsley in 1995 and
due in 2007 (carrying  value of $149.3  million),  (iii) $325 million  aggregate
principal amount of 10 5/8% senior subordinated notes issued by Mesa in 1996 and
due 2006  (carrying  value of $369.6  million) and (iv) $264  million  aggregate
principal amount of 11 5/8% senior subordinated discount notes issued by Mesa in
1996 and due 2006  (carrying  value of $209.5  million).  The  weighted  average
interest rate for the nine months ended  September  30, 1997 on Pioneer's  total
indebtedness  was 8.05% as compared to 7.82% for the nine months ended September
30, 1996 (taking into account the effect of interest rate swaps).

        Pioneer continues to review its capital structure and assess its options
with regard to the various debt instruments  currently in its capital structure.
With the  anticipated  acquisition  of Chauvco,  this review and  analysis  will
expand to include the debt obligations of Chauvco.

        Options   available  to  Pioneer   include  leaving  the  existing  debt
instruments in place,  refinancing with a similar debt instrument with a current
market rate, prepayments as allowed by the agreement governing such instruments,
refinancing with debt instruments  unlike the instrument being retired and other
options as either specified or allowed by the agreements or indentures governing

                                       27

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

the  respective  obligations.  Pioneer  anticipates  beginning  the  process  of
refinancing  certain of its debt instruments  during the fourth quarter of 1997.
With  respect  to the debt  obligations  of  Chauvco,  Pioneer  is  planning  to
refinance  such  debt  obligations  with a new  Canadian  credit  facility  (the
"Pioneer Canada Credit  Facility").  However,  Pioneer currently does not have a
commitment  from any lenders  providing for the Pioneer Canada Credit  Facility,
nor can there be any  assurance  that Pioneer will be able to obtain the Pioneer
Canada Credit Facility upon acceptable terms, or at all.

        As Pioneer  continues  to pursue its business  strategy,  it may utilize
alternative  financing  sources,  including  the issuance for cash of fixed rate
long-term public debt,  convertible  securities or preferred stock.  Pioneer may
also issue  securities  in exchange for oil and gas  properties,  stock or other
interests  in  other  oil  and  gas  companies  or  related  assets.  Additional
securities  may be of a class  preferred  to common  stock with  respect to such
matters as dividends and  liquidation  rights and may also have other rights and
preferences as determined by Pioneer's Board of Directors.

        On November 14, 1997, Pioneer's wholly-owned subsidiary, Pioneer Natural
Resources USA, Inc.,  formerly known as MOC ("Pioneer USA"),  initiated an offer
to  purchase  for  cash  (the  "Offer")  any  and  all  of its  11  5/8%  senior
subordinated  discount  notes  due 2006 (the "11 5/8%  Notes"),  and its 10 5/8%
senior subordinated notes due 2006 (the "10 5/8% Notes" and together with the 11
5/8% Notes,  the "Notes").  The purchase price offered by Pioneer USA for the 11
5/8% Notes and the 10 5/8% Notes is,  respectively,  $829.90 and  $1,171.40  per
$1,000 face amount tendered, plus any interest on the 10 5/8% Notes accrued from
July 1, 1997 to the expiration date of the Offer. Pioneer USA intends to pay for
the purchase price of the Notes tendered in the Offer with borrowings  under its
Credit  Facility  Agreements.  There  are  currently  outstanding  $264  million
aggregate  face amount of the 11 5/8% Notes (having an aggregate  accreted value
of $168 million as of July 1, 1997), and $325 million aggregate principal amount
of the 10 5/8% Notes.

        In  connection with the Offer,  Pioneer USA is  soliciting consents from
holders of record of the Notes at the close of business on November 14, 1997, to
approve amendments to the respective  indentures governing the Notes which would
eliminate  or  modify  most  of  the  restrictive  covenants  contained  in  the
indentures.  Such  amendments  would  become  effective  upon the closing of the
Offer.  A holder  of more  than 66 2/3% in  aggregate  principal  amount of each
outstanding issue of the Notes has agreed to consent to the proposed amendments,
thereby  assuring  that the proposed  amendments  would become  effective if the
Offer is completed.

        The Offer is expected to expire on December 15, 1997, and the closing of
the Offer is expected to occur three business days after the expiration date. If
the Offer is completed with 100% of the Notes tendered,  Pioneer expects to take
a charge to its fourth  quarter 1997 earnings of $12 million to $15 million (net
of tax benefit).

        Sales of Nonstrategic Assets. During the nine months ended September 30,
1997 and 1996,  proceeds from the sale of domestic  nonstrategic  assets totaled
$12.8  million and $51.2  million,  respectively.  In addition,  during the nine
months ended September 30, 1996, Pioneer sold certain Australasian  subsidiaries
resulting in cash proceeds of $183.1 million. The proceeds from these sales were
utilized  to reduce  Pioneer's  outstanding  bank  indebtedness  and for general
working  capital  purposes.  Pioneer  anticipates  that it will continue to sell
nonstrategic  properties  from  time  to  time  to  increase  capital  resources
available for other activities and to achieve administrative efficiencies.

        During the fourth quarter of 1997, Pioneer  anticipates  selling certain
nonstrategic oil and gas properties for approximately $100 million.

        Liquidity.  At September 30, 1997, Pioneer had $40.6 million of cash and
cash  equivalents  on hand,  compared  to $18.7  million at December  31,  1996.
Pioneer's  ratio of current assets to current  liabilities was 1.36 at September
30, 1997 and 1.29 at December 31, 1996.
- ---------------
(1)  The information in this document includes  forward-looking  statements that
     are  based on  assumptions  that in the  future  may prove not to have been
     accurate.  Those  statements,  and Pioneer's  business and  prospects,  are
     subject  to a  number  of risks  including  the  volatility  of oil and gas
     prices,  environmental risks, operating hazards and risks, risks associated
     with  natural gas  processing  plants,  risks  related to  exploration  and
     development   drilling,   uncertainties   about   estimates   of  reserves,
     competition, government regulation, and the ability of Pioneer to implement
     its  business  strategy.  These and other risks are  described  in Parker &
     Parsley's  1996  Annual  Report on Form 10-K  which is  available  from the
     United States Securities and Exchange Commission.

                                       28

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


                           PART II. OTHER INFORMATION

Item 1.     Legal Proceedings

Pioneer is party to various legal proceedings,  which are described under "Legal
Actions" in Note F of Notes to  Consolidated  Financial  Statements  included in
"Item 1.  Financial  Statements".  Pioneer  is also  party  to other  litigation
incidental to its business. The claims for damages from such other legal actions
are not in excess of 10% of Pioneer's  current assets and Pioneer  believes none
of these actions to be material.

Item 4.     Submission of Matters to a Vote of Security Holders

On August 7, 1997, Pioneer's  predecessor  entities,  Parker & Parsley and Mesa,
each held a Special Meeting for their respective  stockholders in Dallas, Texas.
At both meetings,  the following  three proposals were submitted for vote to the
stockholders:  (i) to approve and adopt an Amended and  Restated  Agreement  and
Plan of Merger, dated as of April 6, 1997 (the "Merger Agreement"), among Parker
& Parsley,  Mesa and its  subsidiaries,  Pioneer and Mesa Operating Co. ("MOC"),
which  provides for the business  combination of Parker & Parsley and Mesa (as a
result of the business  combination,  Mesa, which is a Texas  corporation,  will
reincorporate  to Delaware  by merging  into  Pioneer and Parker & Parsley  will
merge into MOC and thereby become a wholly-owned subsidiary of Pioneer), (ii) to
approve  the  adoption  of the  Pioneer  Long-Term  Incentive  Plan and (iii) to
approve the adoption  of the Pioneer  Employee Stock Purchase Plan.  Each of the
proposals was approved by stockholders as follows:

<TABLE>
Parker & Parsley
- ----------------
<CAPTION>

                                                                                     Broker
   Proposal                                    For         Against      Abstain     Non-Votes
   --------                                 ----------    ---------    ---------    ---------
<S>                                         <C>           <C>          <C>          <C>

Merger Agreement                            26,837,927      116,119      162,228        -
Long-Term Incentive Plan                    17,625,487    9,206,701      284,086        -
Employee Stock Purchase Plan                26,254,862      582,103      279,309        -
</TABLE>
<TABLE>
Mesa
- ----
<CAPTION>
                                                                                     Broker
   Proposal                                    For         Against      Abstain     Non-Votes
   --------                                 ----------    ---------    ---------    ---------
<S>     <C>    <C>    <C>    <C>    <C>    <C>
Merger Agreement
 Common stockholders of Mesa                45,946,840    1,068,821    2,259,454        -
 Preferred Series A stockholders of Mesa    36,054,385    8,953,770    4,125,626        -
 Preferred Series B stockholders of Mesa    62,424,436          -            -          -

Pioneer Long-Term Incentive Plan
 Common stockholders of Mesa                39,505,930    6,668,536    3,100,649        -
 Preferred Series A stockholders of Mesa    34,019,452    7,940,429    7,173,900        -
 Preferred Series B stockholders of Mesa    62,424,436          -            -          -

Employee Stock Purchase Plan
 Common stockholders of Mesa                43,605,373    2,614,233    3,055,509        -
 Preferred Series A stockholders of Mesa    38,146,770    3,797,918    7,189,093        -
 Preferred Series B stockholders of Mesa    62,424,436          -            -          -

Mesa Incentive Plan
 Common stockholders of Mesa                35,657,052   10,554,566    3,063,497        -
 Preferred Series A stockholders of Mesa    33,186,078    8,762,547    7,185,156        -
 Preferred Series B stockholders of Mesa    62,424,436          -            -          -
</TABLE>
                                       29

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


Item 6.     Exhibits and Reports on Form 8-K

Exhibits

    2.1     Amended and Restated Agreement and Plan of Merger, dated as of April
            6, 1997,  by and among Mesa,  MOC,  MXP  Reincorporation  Corp.  and
            Parker &  Parsley  (incorporated  by  reference  to  Exhibit  2.1 to
            Pioneer's  Registration  Statement on Form S-4, dated June 27, 1997,
            Registration No. 333-26951).

    2.2     Combination Agreement,  dated September 3, 1997, between Pioneer and
            Chauvco  (incorporated  by  reference  to Exhibit  2.1 to  Pioneer's
            Current Report on Form 8-K, File No.  001-13245,  filed with the SEC
            on October 2, 1997).

    2.3     Plan of Arrangement  under Section 186 of the Business  Corporations
            Act (Alberta) (incorporated by reference to Exhibit 2.1 to Pioneer's
            Current Report on Form 8-K, File No.  001-13245,  filed with the SEC
            on October 2, 1997).

    2.4     Form  of  Support  Agreement  between  Pioneer  and  Pioneer Natural
            Resources (Canada) Ltd.("Pioneer Canada") (incorporated by reference
            to  Exhibit  2.1 to  Pioneer's Current Report on Form 8-K,  File No.
            001-13245, filed with the SEC on October 2, 1997).

    2.5     Form of Voting and Exchange Trust Agreement  among Pioneer,  Pioneer
            Canada  and   Montreal   Trust   Company   of  Canada,   as  Trustee
            (incorporated by reference to Pioneer's  Current Report on Form 8-K,
            File No. 001-13245, filed with the SEC on October 2, 1997).

    2.6     Shareholders  Agreement,  dated  as of  September  3,  1997,  by and
            between  Pioneer and Guy J. Turcotte  (incorporated  by reference to
            Exhibit  2.2 to  Pioneer's  Current  Report  on Form  8-K,  File No.
            001-13245, filed with the SEC on October 2, 1997).

    2.7     Shareholders Agreement,  dated as of September 3, 1997, by and among
            Pioneer, Chauvco, DNR-MESA Holdings, L.P., Scott D. Sheffield and I.
            Jon Brumley  (incorporated  by reference to Exhibit 2.3 to Pioneer's
            Current Report on Form 8-K, File No.  001-13245,  filed with the SEC
            on October 2, 1997).

    2.8     Shareholders Agreement,  dated as of September 3, 1997, by and among
            Pioneer,   Trimac  Corporation  and  Gandis  Inc.  (incorporated  by
            reference  to Exhibit 2.4 to Pioneer's  Current  Report on Form 8-K,
            File No.
            001-13245, filed with the SEC on October 2, 1997).

    3.1     Restated  Certificate of  Incorporation of Pioneer  (incorporated by
            reference to Exhibit 3.1 to Pioneer's Registration Statement on Form
            S-4, Registration No.  333-26951).

    3.2     Restated Bylaws of Pioneer (incorporated by reference to Exhibit 3.2
            to Pioneer's  Registration  Statement on Form S-4,  Registration No.
            333-26951).

    3.3     Terms and  Conditions  of Pioneer  Special  Preferred  Voting  Stock
            (incorporated  by  reference  to Exhibit  2.1 to  Pioneer's  Current
            Report  on Form  8-K,  File  No.  001-13245,  filed  with the SEC on
            October 2, 1997).

    3.4     Exchangeable Share Provisions  (incorporated by reference to Exhibit
            2.1 to Pioneer's  Current  Report on Form 8-K,  File No.  001-13245,
            filed with the SEC on October 2, 1997).

    10.1*   First  Supplemental  Indenture,  dated as of April 15,  1997,  among
            Pioneer Natural Resources USA, Inc.  ("Pioneer USA") (formerly MOC),
            as Issuer, Mesa, the subsidiary  guarantors named therein,  Pioneer,
            and Harris Trust and Savings Bank, as Trustee,  with respect to that
            certain  Indenture,  dated as of July 2,  1996,  among  Pioneer  USA
            (formerly MOC), as Issuer, Pioneer (Mesa's successor), as Guarantor,
            and Harris Trust and Savings Bank, as Trustee, relating to Pioneer's
            11-5/8% Senior Subordinated Discount Notes Due 2006.

                                       30

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


    10.2*   Second  Supplemental  Indenture,  dated as of August 7, 1997,  among
            Pioneer  USA  (formerly  MOC),  as  Issuer,   Mesa,  the  subsidiary
            guarantors  named  therein,  Pioneer,  and Harris  Trust and Savings
            Bank, as Trustee,  with respect to that certain Indenture,  dated as
            of July 2,  1996,  among  Pioneer  USA  (formerly  MOC),  as Issuer,
            Pioneer  (Mesa's  successor),  as  Guarantor,  and Harris  Trust and
            Savings  Bank,  as Trustee,  relating to  Pioneer's  11-5/8%  Senior
            Subordinated Discount Notes Due 2006.

    10.3*   First  Supplemental  Indenture,  dated as of April 15,  1997,  among
            Pioneer  USA  (formerly  MOC),  as  Issuer,   Mesa,  the  subsidiary
            guarantors  named  therein,  Pioneer,  and Harris  Trust and Savings
            Bank, as Trustee,  with respect to that certain Indenture,  dated as
            of July 2,  1996,  among  Pioneer  USA  (formerly  MOC),  as Issuer,
            Pioneer  (Mesa's  successor),  as  Guarantor,  and Harris  Trust and
            Savings  Bank,  as Trustee,  relating to  Pioneer's  10-5/8%  Senior
            Subordinated Notes Due 2006.

    10.4*   Second  Supplemental  Indenture,  dated as of August 7, 1997,  among
            Pioneer  USA  (formerly  MOC),  as  Issuer,   Mesa,  the  subsidiary
            guarantors  named  therein,  Pioneer,  and Harris  Trust and Savings
            Bank, as Trustee,  with respect to that certain Indenture,  dated as
            of July 2,  1996,  among  Pioneer  USA  (formerly  MOC),  as Issuer,
            Pioneer  (Mesa's  successor),  as  Guarantor,  and Harris  Trust and
            Savings  Bank,  as Trustee,  relating to  Pioneer's  10-5/8%  Senior
            Subordinated Notes Due 2006.

    10.5*   First  Supplemental  Indenture,  dated as of August 7,  1997,  among
            Parker & Parsley,  The Chase Manhattan Bank, as Trustee, and Pioneer
            USA, with respect to that certain  Indenture,  dated as of April 12,
            1995, among Pioneer USA (successor to Parker & Parsley),  as Issuer,
            and The Chase Manhattan Bank (National Association), as Trustee.

    10.6*   Amendment  to  1990  Gathering  Agreement  Amendment,  dated  as  of
            September  1, 1997,  between  Colorado  Interstate  Gas  Company and
            Pioneer USA (formerly MOC).

    10.7*   Severance Agreement, dated as of August 8, 1997, between Pioneer and
            Scott  D.   Sheffield,   together   with  a   schedule   identifying
            substantially  identical  agreements between Pioneer and each of the
            other  named  executive  officers  identified  on Schedule I for the
            purpose  of  defining  the  payment  of  certain  benefits  upon the
            termination of the officer's employment under certain circumstances.

    10.8*   Indemnification  Agreement,  dated as of  August  8,  1997,  between
            Pioneer and Scott D. Sheffield, together with a schedule identifying
            substantially  identical  agreements  between  Pioneer  and  each of
            Pioneer's other directors and named executive officers identified on
            Schedule I.

    10.9    Pioneer  Natural   Resources   Company   Long-Term   Incentive  Plan
            (incorporated by reference to Exhibit 4.1 to Pioneer's  Registration
            Statement on Form S-8, Registration No. 333-35087).

    10.10   Pioneer  Natural  Resources  Company  Employee  Stock  Purchase Plan
            (incorporated by reference to Exhibit 4.1 to Pioneer's  Registration
            Statement on Form S-8, Registration No. 333-35165).

    10.11   Pioneer Natural Resources Company Deferred  Compensation  Retirement
            Plan   (incorporated  by  reference  to  Exhibit  4.1  to  Pioneer's
            Registration Statement on Form S-8, Registration No. 333-39153).

    10.12   Pioneer Natural Resources  USA, Inc.  401(k)  Plan  (incorporated by
            reference to Exhibit 4.1 to Pioneer's Registration Statement on Form
            S-8, Registration No.  333-39249).

    10.13   Credit Facility Agreement (Primary Facility),  dated as of August 7,
            1997,  between  Pioneer USA, as Borrower,  and NationsBank of Texas,
            N.A., as Administrative  Agent,  CIBC Inc., as Documentation  Agent,
            Morgan Guaranty Trust Company of New York, as  Documentation  Agent,
            The Chase  Manhattan Bank, as Syndication  Agent,  and the Co-Agents
            and other Lenders  signatory  thereto  (incorporated by reference to
            Exhibit 10.1 to Pioneer's Form 8-K,  dated August 7, 1997,  File No.
            333-26951).

                                       31

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)

    10.14   Credit Facility Agreement (365 Day Facility),  dated as of August 7,
            1997,  between  Pioneer USA, as Borrower,  and NationsBank of Texas,
            N.A., as Administrative  Agent,  CIBC Inc., as Documentation  Agent,
            Morgan Guaranty Trust Company of New York, as  Documentation  Agent,
            The Chase  Manhattan Bank, as Syndication  Agent,  and the Co-Agents
            and other Lenders  signatory  thereto  (incorporated by reference to
            Exhibit 10.2 to Pioneer's Form 8-K,  dated August 7, 1997,  File No.
            333-26951).

    10.15*  Gathering  Agreement,  dated May 29, 1987,  between  Mesa  Operating
            Limited Partnership and Colorado Interstate Gas Company.

    27.*     Financial Data Schedule.

* filed herewith

Reports on Form 8-K

During the quarter ended September 30, 1997, Pioneer filed the following Current
Reports on Form 8-K:

    (1)  On July 31, 1997, Pioneer filed a Current Report on Form 8-K dated July
         29, 1997 reporting under Item 5 (Other Events) the  announcement of its
         financial  results for the three and six months ended June 30, 1997 and
         reporting  under Item 7 (Financial  Statements  and Exhibits) the press
         release related to such announcement as an exhibit.

    (2)  On August 1,  1997,  Pioneer  filed a Current  Report on Form 8-K dated
         July 28, 1997  reporting  under Item 5 (Other Events) the conversion of
         its 6 1/4% Cumulative  Guaranteed Monthly Income Convertible  Preferred
         Shares to common stock and reporting under Item 7 (Financial Statements
         and  Exhibits)  the press  release  related  to such  conversion  as an
         exhibit.

    (3)  On August 21, 1997,  Pioneer  filed a Current  Report on Form 8-K dated
         August 7,  1997  reporting  (a) under  Item 1  (Change  in  Control  of
         Registrant),  the  formation of Pioneer to complete the merger  between
         Parker & Parsley and Mesa, (b) under Item 2 (Acquisition or Disposition
         of Assets) the  purchase of Mesa by Parker & Parsley to account for the
         merger and (c) under Item 7 (Financial  Statements  and  Exhibits)  pro
         forma financial information of Pioneer giving effect to the merger. The
         following unaudited pro forma consolidated information of Pioneer gives
         effect to (i) the  divestitures  of certain  wholly-owned  Australasian
         subsidiaries,  (ii) the  divestitures  of the  wholly-owned  subsidiary
         Bridge  Oil  Timor  Sea,  Inc.,   (iii)  the  divestitures  of  certain
         nonstrategic  domestic oil and gas properties,  gas plants, and related
         assets and contract  rights,  (iv) the  acquisition of Mesa by Parker &
         Parsley, (v) the 1996 recapitalization of Mesa's balance sheet and (vi)
         the  acquisition  of  all  of  the  outstanding   equity  of  Greenhill
         Corporation  and additional  borrowings to finance such  acquisition by
         Mesa.

         (a) Preliminary Statement
         (b) Unaudited  Pro Forma  Combined  Balance  Sheet for Pioneer  Natural
             Resources  Company  as of  June 30,  1997  (c)  Unaudited Pro Forma
             Combined  Statement  of  Operations for  Pioneer  Natural Resources
             Company for the six months ended June 30, 1997
         (d) Unaudited  Pro Forma  Combined  Statement of Operations for Pioneer
             Natural Resources Company for the year ended December 31, 1997
         (e) Unaudited  Pro Forma  Combined Statement of Operations for Parker &
             Parsley Petroleum Company for the year ended December 31, 1997
         (f) Unaudited Pro Forma Combined Statement of Operations for  Mesa Inc.
             for the year ended December 31, 1997
         (g) Notes to Unaudited Pro Forma Combined Financial Statements

    (4)  On October 2, 1997,  Pioneer  filed a Current  Report on Form 8-K dated
         September 3, 1997 reporting  under Item 5 (Other Events) the signing of
         a Combination  Agreement  with Chauvco  Resources Ltd. and under Item 7
         (Financial  Statements and Exhibits)  various documents related to such
         business combination as exhibits.

                                       32

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


                               S I G N A T U R E S



Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereto duly authorized.


                                              PIONEER NATURAL RESOURCES COMPANY





Date:    November 14, 1997                By:   /s/ Garrett Smith
                                              --------------------------------
                                                M. Garrett Smith
                                                Senior Vice President, Finance


                                       33

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


Exhibit Index                                                              Page

    2.1    Amended and Restated Agreement and  Plan of Merger,  dated as of
           April 6, 1997, by and among Mesa, MOC, MXP Reincorporation Corp.
           and Parker &  Parsley  (incorporated  by  reference  to  Exhibit
           2.1 to Pioneer's Registration Statement on Form S-4,  dated June
           27, 1997, Registration No. 333-26951).

    2.2    Combination Agreement,  dated September 3, 1997, between Pioneer
           and  Chauvco  (incorporated  by  reference  to  Exhibit  2.1  to
           Pioneer's Current Report on Form 8-K, File No. 001-13245,  filed
           with the SEC on October 2, 1997).

    2.3    Plan  of  Arrangement  under   Section  186  of   the   Business
           Corporations Act (Alberta) (incorporated by reference to Exhibit
           2.1 to Pioneer's Current Report on Form 8-K, File No. 001-13245,
           filed with the SEC on October 2, 1997).

    2.4    Form of Support Agreement  between  Pioneer and  Pioneer Natural
           Resources  (Canada)  Ltd. ("Pioneer  Canada")  (incorporated  by
           reference to  Exhibit  2.1  to Pioneer's Current  Report on Form
           8-K, File No. 001-13245, filed with the SEC on October 2, 1997).

    2.5    Form  of  Voting  and  Exchange  Trust Agreement  among Pioneer,
           Pioneer Canada and Montreal Trust Company of Canada,  as Trustee
           (incorporated by  reference to Pioneer's  Current Report on Form
           8-K, File No. 001-13245, filed with the SEC on October 2, 1997).

    2.6    Shareholders Agreement, dated  as of September 3,  1997,  by and
           between  Pioneer and Guy J. Turcotte  (incorporated by reference
           to Exhibit 2.2 to Pioneer's Current Report on Form 8-K, File No.
           001-13245, filed with the SEC on October 2, 1997).

    2.7    Shareholders Agreement,  dated as of September 3,  1997,  by and
           among  Pioneer,  Chauvco,  DNR-MESA  Holdings,  L.P.,  Scott  D.
           Sheffield  and  I.  Jon  Brumley  (incorporated  by reference to
           Exhibit 2.3  to  Pioneer's  Current Report on Form 8-K, File No.
           001-13245, filed with the SEC on October 2, 1997).

    2.8    Shareholders Agreement,  dated  as of  September 3, 1997, by and
           among Pioneer, Trimac Corporation and Gandis Inc.  (incorporated
           by reference  to Exhibit 2.4 to Pioneer's Current Report on Form
           8-K, File No. 001-13245, filed with the SEC on October 2, 1997).

    3.1    Restated  Certificate of Incorporation  of Pioneer (incorporated
           by reference to  Exhibit 3.1 to Pioneer's Registration Statement
           on Form S-4, Registration No. 333-26951).

    3.2    Restated Bylaws of Pioneer (incorporated by reference to Exhibit
           3.2  to   Pioneer's  Registration   Statement   on   Form   S-4,
           Registration No. 333-26951).

    3.3    Terms and Conditions of Pioneer Special Preferred  Voting  Stock
           (incorporated by reference to Exhibit  2.1 to  Pioneer's Current
           Report on Form 8-K,  File No. 001-13245,  filed  with the SEC on
           October 2, 1997).

    3.4    Exchangeable  Share  Provisions  (incorporated  by  reference to
           Exhibit 2.1 to Pioneer's  Current  Report on Form 8-K,  File No.
           001-13245, filed with the SEC on October 2, 1997).

    10.1*  First Supplemental Indenture, dated as of April 15, 1997,  among
           Pioneer  Natural  Resources USA, Inc.  ("Pioneer USA") (formerly
           MOC), as Issuer, Mesa,  the subsidiary guarantors named therein,
           Pioneer,  and Harris  Trust and Savings Bank,  as Trustee,  with
           respect  to  that certain  Indenture,  dated as of July 2, 1996,
           among  Pioneer  USA (formerly  MOC),  as Issuer, Pioneer (Mesa's
           successor), as Guarantor,  and Harris Trust and Savings Bank, as
           Trustee,  relating  to  Pioneer's  11-5/8%  Senior  Subordinated
           Discount Notes Due 2006.

                                       34

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


    10.2*   Second  Supplemental  Indenture,  dated  as  of August 7, 1997,
            among  Pioneer  USA  (formerly  MOC),  as  Issuer,   Mesa,  the
            subsidiary guarantors named therein, Pioneer,  and Harris Trust
            and  Savings  Bank,  as Trustee,  with respect  to that certain
            Indenture,  dated  as  of  July  2,  1996,  among  Pioneer  USA
            (formerly  MOC),  as Issuer,  Pioneer  (Mesa's  successor),  as
            Guarantor,  and  Harris  Trust  and Savings  Bank,  as Trustee,
            relating  to  Pioneer's  11-5/8%  Senior Subordinated  Discount
            Notes Due 2006.

    10.3*   First Supplemental Indenture, dated as of April 15, 1997, among
            Pioneer USA (formerly MOC),  as Issuer,  Mesa,  the  subsidiary
            guarantors named therein, Pioneer, and Harris Trust and Savings
            Bank, as Trustee, with respect to that certain Indenture, dated
            as of July 2,  1996,  among  Pioneer  USA  (formerly  MOC),  as
            Issuer, Pioneer (Mesa's  successor),  as Guarantor,  and Harris
            Trust and  Savings  Bank,  as Trustee,  relating  to  Pioneer's
            10-5/8% Senior Subordinated Notes Due 2006.

    10.4*   Second  Supplemental  Indenture,  dated  as of  August 7, 1997,
            among  Pioneer  USA  (formerly  MOC),  as  Issuer,   Mesa,  the
            subsidiary guarantors named therein, Pioneer,  and Harris Trust
            and Savings Bank,  as Trustee,  with  respect to  that  certain
            Indenture,  dated  as  of  July  2,  1996,  among  Pioneer  USA
            (formerly  MOC),  as  Issuer, Pioneer  (Mesa's  successor),  as
            Guarantor,  and  Harris  Trust and  Savings  Bank,  as Trustee,
            relating  to Pioneer's 10-5/8%  Senior  Subordinated  Notes Due
            2006.

    10.5*   First Supplemental Indenture, dated as of August 7, 1997, among
            Parker & Parsley,  The  Chase  Manhattan  Bank, as Trustee, and
            Pioneer USA, with respect to that certain  Indenture,  dated as
            of April 12,  1995,  among  Pioneer USA  (successor to Parker &
            Parsley),  as Issuer,  and  The Chase Manhattan Bank  (National
            Association), as Trustee.

    10.6*   Amendment to  1990 Gathering Agreement Amendment,  dated as  of
            September 1, 1997,  between Colorado Interstate Gas Company and
            Pioneer USA (formerly MOC).

    10.7*   Severance  Agreement,  dated  as of  August  8,  1997,  between
            Pioneer and Scott  D. Sheffield,   together  with  a   schedule
            identifying substantially  identical agreements between Pioneer
            and each of the other named executive  officers  identified  on
            Schedule I for the  purpose of  defining the payment of certain
            benefits upon the termination of the officer's employment under
            certain circumstances.

    10.8*   Indemnification Agreement, dated as of August 8, 1997,  between
            Pioneer  and  Scott D.  Sheffield,  together  with  a  schedule
            identifying substantially identical agreements between  Pioneer
            and  each of  Pioneer's  other  directors and  named  executive
            officers identified on Schedule I.

    10.9    Pioneer Natural  Resources  Company  Long-Term  Incentive  Plan
            (incorporated  by   reference  to   Exhibit  4.1  to  Pioneer's
            Registration Statement on Form S-8, Registration No. 333-35087).

    10.10   Pioneer Natural  Resources Company Employee Stock Purchase Plan
            (incorporated  by   reference  to   Exhibit  4.1  to  Pioneer's
            Registration Statement on Form S-8, Registration No. 333-35165).

    10.11   Pioneer  Natural   Resources  Company   Deferred   Compensation
            Retirement Plan  (incorporated by reference to Exhibit  4.1  to
            Pioneer's Registration Statement on Form S-8,  Registration No.
            333-39153).

    10.12   Pioneer Natural Resources USA,  Inc. 401(k) Plan  (incorporated
            by reference to Exhibit 4.1 to Pioneer's Registration Statement
            on Form S-8, Registration No. 333-39249).

                                       35

<PAGE>


                        PIONEER NATURAL RESOURCES COMPANY
                  (formerly Parker & Parsley Petroleum Company)


    10.13   Credit  Facility  Agreement  (Primary Facility),  dated  as  of
            August 7, 1997, between Pioneer USA, as Borrower,  and Nations-
            Bank of Texas, N.A., as  Administrative  Agent,  CIBC  Inc., as
            Documentation Agent, Morgan Guaranty Trust Company of New York,
            as  Documentation  Agent,   The   Chase   Manhattan   Bank,  as
            Syndication  Agent,   and  the  Co-Agents   and  other  Lenders
            signatory thereto (incorporated by reference to Exhibit 10.1 to
            Pioneer's Form 8-K,  dated August 7, 1997, File No. 333-26951).

    10.14   Credit  Facility  Agreement  (365  Day  Facility),  dated as of
            August 7, 1997,  between Pioneer USA, as Borrower, and Nations-
            Bank of  Texas, N.A., as  Administrative  Agent,  CIBC Inc., as
            Documentation Agent, Morgan Guaranty Trust Company of New York,
            as  Documentation   Agent,   The   Chase   Manhattan  Bank,  as
            Syndication  Agent,   and  the  Co-Agents   and  other  Lenders
            signatory thereto (incorporated by reference to Exhibit 10.2 to
            Pioneer's Form 8-K, dated August 7, 1997, File No. 333-26951).

    10.15*  Gathering Agreement, dated May 29, 1987, between Mesa Operating
            Limited Partnership and Colorado Interstate Gas Company.

    27.*    Financial Data Schedule.

* filed herewith


                                       36

<PAGE>




                                                                   EXHIBIT 10.1



                               MESA OPERATING CO.,
                                              Issuer

                                       and


                                   MESA INC.,

                         GREENHILL PETROLEUM CORPORATION

                                       and

                                WESTPAN NGL CO.,
                                            Guarantors


                                  $264,000,000


                   11 5/8% Senior Subordinated Discount Notes


                                due July 1, 2006


                          FIRST SUPPLEMENTAL INDENTURE


                           Dated as of April 15, 1997


                          HARRIS TRUST AND SAVINGS BANK
                                                   Trustee




<PAGE>



                          FIRST SUPPLEMENTAL INDENTURE


     THIS FIRST SUPPLEMENTAL  INDENTURE,  dated as of April 15, 1997, among MESA
OPERATING CO., a Delaware corporation ("MOC") (the "Issuer"), MESA INC., a Texas
corporation ("Mesa"),  GREENHILL PETROLEUM  CORPORATION,  a Delaware corporation
("Greenhill"), and WESTPAN NGL CO., a Delaware  corporation  ("Westpan")  (Mesa,
together with  Greenhill and Westpan,  the  "Guarantors"),  and HARRIS TRUST AND
SAVINGS BANK, a corporation  organized and existing  under the laws of the State
of Illinois, as trustee (the "Trustee").

     Intending to be legally bound hereby, each of the parties agrees as follows
for the benefit of the other  parties  and for the equal and ratable  benefit of
Holders of the Issuers' 11 5/8% Senior  Subordinated  Discount Notes due July 1,
2006 (the "Securities"):

     WHEREAS,  MOC, Mesa and the Trustee are parties to that certain  Indenture,
dated as of July 2, 1996 (the  "Indenture"),  pursuant  to which the  Securities
were issued; and

     WHEREAS,  MOC and Western Mining Corporation (USA), a Delaware  corporation
("Western"),  have entered into a Stock Purchase Agreement, dated as of February
7, 1997,  pursuant to which MOC will  purchase  from  Western all the issued and
outstanding capital stock of Greenhill; and

     WHEREAS,  upon completion of the acquisition,  Greenhill will be a Material
Restricted Subsidiary of the Issuer; and

     WHEREAS,  MOC  incorporated  a new  wholly-owned  subsidiary in the name of
Westpan, which is a Material Restricted Subsidiary; and

     WHEREAS,  Section 4.14 of the Indenture  provides that upon the acquisition
or  creation  of a  Material  Restricted  Subsidiary,  the  acquired  or created
Material  Restricted  Subsidiary shall be deemed to make the guarantee set forth
in Section 11.1 of the Indenture,  and MOC shall cause such Material  Restricted
Subsidiary to evidence such guarantee in the manner set forth in Section 11.2 of
the Indenture; and

     WHEREAS,  Section  11.2 of the  Indenture  provides  that  each  Subsidiary
Guarantor endorse a Guaranty and execute the Indenture; and

     WHEREAS,  capitalized  terms used herein and not otherwise defined are used
as defined in the Indenture;

     NOW,  THEREFORE,  in consideration of these premises and for other good and
valuable   consideration,   the  receipt   and   adequacy  of  which  is  hereby
acknowledged,  the Issuer and the Guarantors agree as follows for the benefit of
the Trustee and the Holders of the  Securities,  and hereby amend and supplement
the Indenture as follows:

                                        2

<PAGE>



     1. In accordance with the provisions of Sections 4.14, 11.1 and 11.2 of the
Indenture,  each of Greenhill and Westpan agrees to endorse each of the Notes as
Guarantor and to execute the Indenture.

     2. Upon the  execution and delivery of this First  Supplemental  Indenture,
the Indenture shall be modified to reflect the addition of Greenhill and Westpan
as Guarantors under the Indenture,  and this First Supplemental  Indenture shall
form a part of the  Indenture  for all purposes  and every Holder of  Securities
heretofore or hereinafter  authenticated and delivered  hereunder shall be bound
by the Indenture, as so modified.

     3.  Except  to the  extent  amended  by or  inconsistent  with  this  First
Supplemental Indenture, the Issuer, the Guarantors and the Trustee hereby ratify
and reconfirm the Indenture in its entirety.

     4. This  First  Supplemental  Indenture  may be  executed  in any number of
counterparts,  each of which so  executed  shall  be an  original,  but all such
counterparts shall together constitute but one and the same instrument.

     5. The laws of the State of New York  shall  govern  the  construction  and
interpretation  of  this  First  Supplemental   Indenture,   without  regard  to
principles of conflicts of laws.

                                        3

<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto  executed this First  Supplemental
Indenture as of the date first above written.

                                          MESA OPERATING CO.
Attest:

   /s/   Gary M. Prescott, III            By:         /s/   Stephen K. Gardner
- ------------------------------                     ---------------------------
Gary M. Prescott, III                              Stephen K. Gardner
Corporate Secretary                                Senior Vice President


                                          MESA INC.
Attest:

   /s/   Gary M. Prescott, III            By:         /s/   Stephen K. Gardner
- ------------------------------                     ---------------------------
Gary M. Prescott, III                              Stephen K. Gardner
Corporate Secretary                                Senior Vice President


                                          GREENHILL PETROLEUM CORPORATION
Attest:

   /s/   Gary M. Prescott, III            By:         /s/   Stephen K. Gardner
- ------------------------------                     ---------------------------
Gary M. Prescott, III                              Stephen K. Gardner
Corporate Secretary                                Senior Vice President


                                          WESTPAN NGL CO.
Attest:

   /s/   Gary M. Prescott, III            By:         /s/   Stephen K. Gardner
- ------------------------------                     ---------------------------
Gary M. Prescott, III                              Stephen K. Gardner
Corporate Secretary                                Senior Vice President


                                          HARRIS TRUST AND SAVINGS BANK,
                                          as Trustee
Attest:

   /s/   D. G. Donovan                    By:         /s/   J. Bartolini
- ------------------------------                     ---------------------------
D. G. Donovan                                      J. Bartolini
Assistant Secretary                                Vice President

                                        4

<PAGE>




                                                                   EXHIBIT 10.2




                               MESA OPERATING CO.,

                                   MESA INC.,

                            THE SUBSIDIARY GUARANTORS

                                       and

                        PIONEER NATURAL RESOURCES COMPANY


                                  $264,000,000


                   11 5/8% Senior Subordinated Discount Notes


                                due July 1, 2006


                          SECOND SUPPLEMENTAL INDENTURE


                           Dated as of August 7, 1997


                          HARRIS TRUST AND SAVINGS BANK
                                                   Trustee





<PAGE>



                          SECOND SUPPLEMENTAL INDENTURE


     THIS SECOND SUPPLEMENTAL INDENTURE,  dated as of August 7, 1997, among MESA
OPERATING CO., a Delaware corporation ("MOC") (the "Issuer"), MESA INC., a Texas
corporation ("Mesa"),  GREENHILL PETROLEUM  CORPORATION,  a Delaware corporation
("Greenhill"), WESTPAN NGL CO., a Delaware  corporation  ("Westpan" and together
with Greenhill,  the "Subsidiary Guarantors") PIONEER NATURAL RESOURCES COMPANY,
a Delaware  corporation  and  wholly-owned  subsidiary of Mesa  ("Pioneer")  and
HARRIS TRUST AND SAVINGS  BANK, a corporation  organized and existing  under the
laws of the State of Illinois, as trustee (the "Trustee").

     Intending to be legally bound hereby, each of the parties agrees as follows
for the benefit of the other  parties  and for the equal and ratable  benefit of
Holders of the Issuers' 11 5/8% Senior  Subordinated  Discount Notes due July 1,
2006 (the "Securities"):

     WHEREAS,  MOC, Mesa, the Subsidiary  Guarantors and the Trustee are parties
to that  certain  Indenture,  dated as of July 2, 1996,  as amended by the First
Supplemental Indenture,  dated as of April 15, 1997 (the "Indenture"),  pursuant
to which the Securities were issued; and

     WHEREAS,  pursuant to an Amended and Restated Agreement and Plan of Merger,
dated as of April 6, 1997 (the "Merger Agreement"), among Mesa, MOC, Pioneer and
Parker & Parsley Petroleum Company, a Delaware corporation ("Parker & Parsley"),
among other things, Mesa will be merged with and into Pioneer with Pioneer being
the surviving corporation (the "Reincorporation  Merger"),  and Parker & Parsley
will be merged with and into MOC with MOC being the surviving corporation; and

     WHEREAS, in connection with the Reincorporation  Merger, the Issuer,  Mesa,
the Subsidiary  Guarantors and Pioneer have duly determined to make, execute and
deliver to the Trustee  this Second  Supplemental  Indenture in order to reflect
the results of the Reincorporation Merger as required by the Indenture; and

     WHEREAS,  pursuant  to  Section  11.3  of the  Indenture,  Pioneer,  as the
survivor to the  Reincorporation  Merger,  is required to expressly assume, by a
supplemental  indenture to the Indenture,  the obligations of Mesa in respect of
the  Securities,  the  Indenture  and the guarantee of Mesa set forth in Section
11.1 of the Indenture; and

     WHEREAS,  capitalized  terms used herein and not otherwise defined are used
as defined in the Indenture;

     NOW,  THEREFORE,  in consideration of these premises and for other good and
valuable   consideration,   the  receipt   and   adequacy  of  which  is  hereby
acknowledged,  the Issuer, Mesa, the Subsidiary  Guarantors and Pioneer agree as
follows for the benefit of the  Trustee and the Holders of the  Securities,  and
hereby amend and supplement the Indenture as follows:

                                        2

<PAGE>



     1. The Issuer,  Mesa,  the Subsidiary  Guarantors,  Pioneer and the Trustee
hereby agree that as of the effective date of this Second Supplemental Indenture
and upon consummation of the Reincorporation  Merger,  Pioneer, as the surviving
corporation of the  Reincorporation  Merger,  shall become the successor to Mesa
for all purposes of the Indenture and hereby  expressly  assumes all obligations
of Mesa in respect to the Securities, the Indenture and Mesa's Guarantee.

     2. The Issuer, Mesa, the Subsidiary Guarantors and Pioneer hereby represent
that immediately after giving effect to the  Reincorporation  Merger, no Default
or Event of Default exists.

     3. The Issuer, Mesa, the Subsidiary Guarantors and Pioneer hereby represent
that the Reincorporation Merger does not violate any of Sections 4.3, 4.7., 4.8,
4.9, 4.10., 4.11, 4.12, 4.13, 4.14, 4.16 and 4.17.

     4. The Reincorporation Merger is permitted by Section 5.1 of the Indenture.

     5.  Except to the  extent  amended  by or  inconsistent  with  this  Second
Supplemental Indenture, the Issuer, Mesa, the Subsidiary Guarantors, Pioneer and
the Trustee hereby ratify and reconfirm the Indenture in its entirety.

     6. This  Second  Supplemental  Indenture  may be  executed in any number of
counterparts,  each of which so  executed  shall  be an  original,  but all such
counterparts shall together constitute but one and the same instrument.

     7. The laws of the State of New York  shall  govern  the  construction  and
interpretation  of  this  Second  Supplemental  Indenture,   without  regard  to
principles of conflicts of laws.

                                        3

<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto executed this Second  Supplemental
Indenture as of the date first above written.

                                            MESA OPERATING CO.
Attest:

   /s/   Gary M. Prescott, III              By:   /s/   M. Garrett Smith
- ------------------------------                  ------------------------
Gary M. Prescott, III                           M. Garrett Smith
Corporate Secretary                             Vice President


                                            MESA INC.
Attest:

   /s/   Gary M. Prescott, III              By:   /s/   M. Garrett Smith
- ------------------------------                  ------------------------
Gary M. Prescott, III                           M. Garrett Smith
Corporate Secretary                             Vice President


                                            GREENHILL PETROLEUM CORPORATION
Attest:

   /s/   Gary M. Prescott, III              By:   /s/   M. Garrett Smith
- ------------------------------                  ------------------------
Gary M. Prescott, III                           M. Garrett Smith
Corporate Secretary                             Vice President


                                            WESTPAN NGL CO.
Attest:

   /s/   Gary M. Prescott, III              By:   /s/   M. Garrett Smith
- ------------------------------                  ------------------------
Gary M. Prescott, III                           M. Garrett Smith
Corporate Secretary                             Vice President


                                            PIONEER NATURAL RESOURCES
                                            COMPANY
Attest:

   /s/   Gary M. Prescott, III              By:   /s/   M. Garrett Smith
- ------------------------------                  ------------------------
Gary M. Prescott, III                           M. Garrett Smith
Corporate Secretary                             Vice President


                                            HARRIS TRUST AND SAVINGS BANK,
                                            as Trustee
Attest:

                                            By:   /s/   J. Bartolini
- ------------------------------                  ------------------------
D. G. Donovan                                   J. Bartolini
Assistant Secretary                             Vice President

                                        4

<PAGE>




                                                                   EXHIBIT 10.3





                               MESA OPERATING CO.,
                                              Issuer

                                       and


                                   MESA INC.,

                         GREENHILL PETROLEUM CORPORATION

                                       and

                                WESTPAN NGL CO.,
                                            Guarantors


                                  $325,000,000


                       10 5/8% Senior Subordinated Notes


                                due July 1, 2006


                          FIRST SUPPLEMENTAL INDENTURE


                           Dated as of April 15, 1997


                          HARRIS TRUST AND SAVINGS BANK
                                                   Trustee







<PAGE>



                          FIRST SUPPLEMENTAL INDENTURE


     THIS FIRST SUPPLEMENTAL  INDENTURE,  dated as of April 15, 1997, among MESA
OPERATING CO., a Delaware corporation ("MOC") (the "Issuer"), MESA INC., a Texas
corporation ("Mesa"),  GREENHILL PETROLEUM  CORPORATION,  a Delaware corporation
("Greenhill"), and WESTPAN NGL CO., a Delaware  corporation  ("Westpan")  (Mesa,
together with  Greenhill and Westpan,  the  "Guarantors"),  and HARRIS TRUST AND
SAVINGS BANK, a corporation  organized and existing  under the laws of the State
of Illinois, as trustee (the "Trustee").

     Intending to be legally bound hereby, each of the parties agrees as follows
for the benefit of the other  parties  and for the equal and ratable  benefit of
Holders of the Issuers' 10 5/8% Senior Subordinated  Notes due July 1, 2006 (the
"Securities"):

     WHEREAS,  MOC, Mesa and the Trustee are parties to that certain  Indenture,
dated as of July 2, 1996 (the  "Indenture"),  pursuant  to which the  Securities
were issued; and

     WHEREAS,  MOC and Western Mining Corporation (USA), a Delaware  corporation
("Western"), have entered into Stock Purchase Agreement, dated as of February 7,
1997,  pursuant  to which MOC will  purchase  from  Western  all the  issued and
outstanding capital stock of Greenhill; and

     WHEREAS,  upon completion of the acquisition,  Greenhill will be a Material
Restricted Subsidiary of the Issuer; and

     WHEREAS,  MOC  incorporated  a new  wholly-owned  subsidiary in the name of
Westpan, which is a Material Restricted Subsidiary; and

     WHEREAS,  Section 4.14 of the Indenture  provides that upon the acquisition
or  creation  of a  Material  Restricted  Subsidiary,  the  acquired  or created
Material  Restricted  Subsidiary shall be deemed to make the guarantee set forth
in Section 11.1 of the Indenture,  and MOC shall cause such Material  Restricted
Subsidiary to evidence such guarantee in the manner set forth in Section 11.2 of
the Indenture; and

     WHEREAS,  Section  11.2 of the  Indenture  provides  that  each  Subsidiary
Guarantor endorse a Guaranty and execute the Indenture; and

     WHEREAS,  capitalized  terms used herein and not otherwise defined are used
as defined in the Indenture;

     NOW,  THEREFORE,  in consideration of these premises and for other good and
valuable   consideration,   the  receipt   and   adequacy  of  which  is  hereby
acknowledged,  the Issuer and the Guarantors agree as follows for the benefit of
the Trustee and the Holders of the  Securities,  and hereby amend and supplement
the Indenture as follows:

                                        2

<PAGE>



     1. In accordance with the provisions of Sections 4.14, 11.1 and 11.2 of the
Indenture,  each of Greenhill and Westpan agrees to endorse each of the Notes as
Guarantor and to execute the Indenture.

     2. Upon the  execution and delivery of this First  Supplemental  Indenture,
the Indenture shall be modified to reflect the addition of Greenhill and Westpan
as Guarantors under the Indenture,  and this First Supplemental  Indenture shall
form a part of the  Indenture  for all purposes  and every Holder of  Securities
heretofore or hereinafter  authenticated and delivered  hereunder shall be bound
by the Indenture, as so modified.

     3.  Except  to the  extent  amended  by or  inconsistent  with  this  First
Supplemental Indenture, the Issuer, the Guarantors and the Trustee hereby ratify
and reconfirm the Indenture in its entirety.

     4. This  First  Supplemental  Indenture  may be  executed  in any number of
counterparts,  each of which so  executed  shall  be an  original,  but all such
counterparts shall together constitute but one and the same instrument.

     5. The laws of the State of New York  shall  govern  the  construction  and
interpretation  of  this  First  Supplemental   Indenture,   without  regard  to
principles of conflicts of laws.

                                        3

<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto  executed this First  Supplemental
Indenture as of the date first above written.

                                           MESA OPERATING CO.
Attest:

   /s/   Gary M. Prescott, III             By:         /s/   Stephen K. Gardner
- ------------------------------                      ---------------------------
Gary M. Prescott, III                               Stephen K. Gardner
Corporate Secretary                                 Senior Vice President


                                           MESA INC.
Attest:

   /s/   Gary M. Prescott, III             By:         /s/   Stephen K. Gardner
- ------------------------------                      ---------------------------
Gary M. Prescott, III                               Stephen K. Gardner
Corporate Secretary                                 Senior Vice President


                                           GREENHILL PETROLEUM CORPORATION
Attest:

   /s/   Gary M. Prescott, III             By:         /s/   Stephen K. Gardner
- ------------------------------                      ---------------------------
Gary M. Prescott, III                               Stephen K. Gardner
Corporate Secretary                                 Senior Vice President


                                           WESTPAN NGL CO.
Attest:

   /s/   Gary M. Prescott, III             By:         /s/   Stephen K. Gardner
- ------------------------------                      ---------------------------
Gary M. Prescott, III                               Stephen K. Gardner
Corporate Secretary                                 Senior Vice President


                                           HARRIS TRUST AND SAVINGS BANK,
                                           as Trustee
Attest:

   /s/   D. G. Donovan                     By:         /s/   J. Bartolini
- ------------------------------                      ---------------------------
D. G. Donovan                                       J. Bartolini
Assistant Secretary                                 Vice President

                                        4

<PAGE>




                                                                   EXHIBIT 10.4





                               MESA OPERATING CO.,

                                   MESA INC.,

                            THE SUBSIDIARY GUARANTORS

                                       and

                        PIONEER NATURAL RESOURCES COMPANY


                                  $325,000,000


                        10 5/8% Senior Subordinated Notes


                                due July 1, 2006


                          SECOND SUPPLEMENTAL INDENTURE


                           Dated as of August 7, 1997


                          HARRIS TRUST AND SAVINGS BANK
                                                   Trustee







<PAGE>



                          SECOND SUPPLEMENTAL INDENTURE


     THIS SECOND SUPPLEMENTAL INDENTURE,  dated as of August 7, 1997, among MESA
OPERATING CO., a Delaware corporation ("MOC") (the "Issuer"), MESA INC., a Texas
corporation ("Mesa"),  GREENHILL PETROLEUM  CORPORATION,  a Delaware corporation
("Greenhill"), WESTPAN NGL CO., a Delaware  corporation  ("Westpan" and together
with Greenhill,  the "Subsidiary Guarantors") PIONEER NATURAL RESOURCES COMPANY,
a Delaware  corporation  and  wholly-owned  subsidiary of Mesa  ("Pioneer")  and
HARRIS TRUST AND SAVINGS  BANK, a corporation  organized and existing  under the
laws of the State of Illinois, as trustee (the "Trustee").

     Intending to be legally bound hereby, each of the parties agrees as follows
for the benefit of the other  parties  and for the equal and ratable  benefit of
Holders of the Issuers' 10 5/8% Senior Subordinated  Notes due July 1, 2006 (the
"Securities"):

     WHEREAS,  MOC, Mesa, the Subsidiary  Guarantors and the Trustee are parties
to that  certain  Indenture,  dated as of July 2, 1996,  as amended by the First
Supplemental Indenture,  dated as of April 15, 1997 (the "Indenture"),  pursuant
to which the Securities were issued; and

     WHEREAS,  pursuant to an Amended and Restated Agreement and Plan of Merger,
dated as of April 6, 1997 (the "Merger Agreement"), among Mesa, MOC, Pioneer and
Parker & Parsley Petroleum Company, a Delaware corporation ("Parker & Parsley"),
among other things, Mesa will be merged with and into Pioneer with Pioneer being
the surviving corporation (the "Reincorporation  Merger"),  and Parker & Parsley
will be merged with and into MOC with MOC being the surviving corporation; and

     WHEREAS, in connection with the Reincorporation  Merger, the Issuer,  Mesa,
the Subsidiary  Guarantors and Pioneer have duly determined to make, execute and
deliver to the Trustee  this Second  Supplemental  Indenture in order to reflect
the results of the Reincorporation Merger as required by the Indenture; and

     WHEREAS,  pursuant  to  Section  11.3  of the  Indenture,  Pioneer,  as the
survivor to the  Reincorporation  Merger,  is required to expressly assume, by a
supplemental  indenture to the Indenture,  the obligations of Mesa in respect of
the  Securities,  the  Indenture  and the guarantee of Mesa set forth in Section
11.1 of the Indenture; and

     WHEREAS,  capitalized  terms used herein and not otherwise defined are used
as defined in the Indenture;

     NOW,  THEREFORE,  in consideration of these premises and for other good and
valuable   consideration,   the  receipt   and   adequacy  of  which  is  hereby
acknowledged,  the Issuer, Mesa, the Subsidiary  Guarantors and Pioneer agree as
follows for the benefit of the  Trustee and the Holders of the  Securities,  and
hereby amend and supplement the Indenture as follows:

                                        2

<PAGE>



     1. The Issuer,  Mesa,  the Subsidiary  Guarantors,  Pioneer and the Trustee
hereby agree that as of the effective date of this Second Supplemental Indenture
and upon consummation of the Reincorporation  Merger,  Pioneer, as the surviving
corporation of the  Reincorporation  Merger,  shall become the successor to Mesa
for all purposes of the Indenture and hereby  expressly  assumes all obligations
of Mesa in respect to the Securities, the Indenture and Mesa's Guarantee.

     2. The Issuer, Mesa, the Subsidiary Guarantors and Pioneer hereby represent
that immediately after giving effect to the  Reincorporation  Merger, no Default
or Event of Default exists.

     3. The Issuer, Mesa, the Subsidiary Guarantors and Pioneer hereby represent
that the Reincorporation Merger does not violate any of Sections 4.3, 4.7., 4.8,
4.9, 4.10., 4.11, 4.12, 4.13, 4.14, 4.16 and 4.17.

     4. The Reincorporation Merger is permitted by Section 5.1 of the Indenture.

     5.  Except to the  extent  amended  by or  inconsistent  with  this  Second
Supplemental Indenture, the Issuer, Mesa, the Subsidiary Guarantors, Pioneer and
the Trustee hereby ratify and reconfirm the Indenture in its entirety.

     6. This  Second  Supplemental  Indenture  may be  executed in any number of
counterparts,  each of which so  executed  shall  be an  original,  but all such
counterparts shall together constitute but one and the same instrument.

     7. The laws of the State of New York  shall  govern  the  construction  and
interpretation  of  this  Second  Supplemental  Indenture,   without  regard  to
principles of conflicts of laws.



                                        3

<PAGE>


     IN WITNESS  WHEREOF,  the parties hereto executed this Second  Supplemental
Indenture as of the date first above written.

                                           MESA OPERATING CO.
Attest:

   /s/   Gary M. Prescott, III             By:   /s/   M. Garrett Smith
- ------------------------------                 ------------------------
Gary M. Prescott, III                          M. Garrett Smith
Corporate Secretary                            Vice President


                                           MESA INC.
Attest:

   /s/   Gary M. Prescott, III             By:   /s/   M. Garrett Smith
- ------------------------------                 ------------------------
Gary M. Prescott, III                          M. Garrett Smith
Corporate Secretary                            Vice President


                                           GREENHILL PETROLEUM CORPORATION
Attest:

   /s/   Gary M. Prescott, III             By:   /s/   M. Garrett Smith
- ------------------------------                 ------------------------
Gary M. Prescott, III                          M. Garrett Smith
Corporate Secretary                            Vice President


                                           WESTPAN NGL CO.
Attest:

   /s/   Gary M. Prescott, III             By:   /s/   M. Garrett Smith
- ------------------------------                 ------------------------
Gary M. Prescott, III                          M. Garrett Smith
Corporate Secretary                            Vice President


                                           PIONEER NATURAL RESOURCES
                                           COMPANY
Attest:

   /s/   Gary M. Prescott, III             By:   /s/   M. Garrett Smith
- ------------------------------                 ------------------------
Gary M. Prescott, III                          M. Garrett Smith
Corporate Secretary                            Vice President


                                           HARRIS TRUST AND SAVINGS BANK,
                                           as Trustee
Attest:

                                           By:   /s/   J. Bartolini
- ------------------------------                 ------------------------
D. G. Donovan                                  J. Bartolini
Assistant Secretary                            Vice President

                                        4

<PAGE>




                                                                   EXHIBIT 10.5


                          FIRST SUPPLEMENTAL INDENTURE

     FIRST  SUPPLEMENTAL  INDENTURE  dated as of  August 7,  1997,  by and among
Parker & Parsley  Petroleum  Company,  a corporation duly organized and existing
under  the  laws of the  State of  Delaware  ("Parker  &  Parsley"),  The  Chase
Manhattan Bank, an association duly  incorporated and existing under the Federal
laws of the United States, as Trustee (the "Trustee"), and MESA Operating Co., a
corporation  duly organized and existing under the laws of the State of Delaware
("MOC").

                                    RECITALS

     A. Parker & Parsley  executed  and  delivered  to the Trustee an  indenture
dated as of April 12, 1995 (the "Indenture")  pursuant to which Parker & Parsley
has issued  $150,000,000  principal amount of 8 7/8%  Senior  Notes Due 2005 and
$150,000,000 principal amount of 8 1/4% Senior Notes Due 2007, both of which are
Debt Securities (as such term is defined in the Indenture).

     B.  Article  IX of the  Indenture  provides  that  Parker &  Parsley,  when
authorized  by a resolution  of the Board of Directors of Parker & Parsley,  and
the Trustee may,  without the consent of the holders of the Notes,  enter into a
supplemental indenture (the "Supplemental Indenture") to evidence the succession
pursuant  to  Article X of the  Indenture  of  another  corporation  to Parker &
Parsley and the assumption by such  successor of the  covenants,  agreements and
obligations of Parker & Parsley in the Indenture and in the Debt Securities.

     C. Parker & Parsley has entered into an Amended and Restated  Agreement and
Plan of Merger dated as of April 6, 1997 (the "Merger Agreement"),  by and among
MESA Inc., a Texas  corporation  ("Mesa"),  MOC, which is a direct  wholly-owned
subsidiary  of  Mesa,  and  Pioneer  Natural  Resources   Company,   a  Delaware
corporation  ("Pioneer") pursuant to which (i) Mesa will be merged with and into
Pioneer,  as a result of which Mesa will reincorporate  into Delaware,  and (ii)
Parker & Parsley will be merged with and into MOC, as a result of which Parker &
Parsley will become a wholly-owned subsidiary of Pioneer (the "Mergers"). In the
Mergers, the name of MOC will be changed to Pioneer Natural Resources USA, Inc.

     D.  Parker & Parsley and MOC desire to amend the  Indenture  to provide for
the assumption by MOC of the covenants,  agreements and  obligations of Parker &
Parsley in the Indenture and in the Debt Securities.

     E. Parker & Parsley and MOC each have duly  authorized  the  execution  and
delivery of this First Supplemental Indenture.


<PAGE>



                                   AGREEMENTS

     NOW, THEREFORE, in consideration of the mutual agreements and covenants set
forth  herein,  the  parties  hereto  hereby  agree,  subject  to the  terms and
conditions hereinafter set forth, as follows:

     Section 1.  Confirmation  of  Original  Indenture.  Except as  amended  and
supplemented hereby, the Indenture is hereby ratified,  confirmed and reaffirmed
in all respects.  The Indenture and this  Supplemental  Indenture shall be read,
taken and construed as one and the same instrument.

     Section 2. Successor Corporation Substituted.  In accordance with Article X
of the Indenture, upon consummation of the Mergers, MOC shall succeed to, and be
substituted  for,  and may exercise  every right and power of,  Parker & Parsley
under the Debt  Securities  and the Indenture with the same effect as if MOC had
been named therein as Parker & Parsley.

     Section 3. Assumption of Obligations. Upon consummation of the Mergers, MOC
hereby  assumes all of the  obligations  of Parker & Parsley under the Indenture
and the Debt Securities with the same effect as if MOC had been named therein as
Parker & Parsley.

     Section 4. Miscellaneous.

          (a) Execution as Supplemental  Indenture.  This Supplemental Indenture
     is executed  and shall be construed  as an  indenture  supplemental  to the
     Indenture and, as provided in the Indenture,  this  Supplemental  Indenture
     forms a part of the Indenture.

          (b) Counterparts.  This Supplemental  Indenture may be executed in any
     number  of  counterparts,  each of  which  shall be an  original,  but such
     counterparts shall together constitute but one and the same instrument.

          (c) Effect of Headings.  The headings  contained in this  Supplemental
     Indenture  are for  convenience  only and shall not be deemed to affect the
     meaning or construction of any of the provisions hereof.



<PAGE>


          IN WITNESS WHEREOF, Parker & Parsley,  the Trustee and MOC have caused
this  Supplemental  Indenture  to be  signed  on  their  behalf  by  their  duly
authorized representatives, all as of the date first above written.

                                            PARKER & PARSLEY PETROLEUM COMPANY



                                            By:   /s/   Mark L. Withrow
                                            -------------------------------
                                            Name:    Mark L. Withrow
                                            Title:   Senior Vice President


                                            THE CHASE MANHATTAN BANK



                                            By:   /s/   P. J. Gilkeson
                                            -------------------------------
                                            Name:    P. J. Gilkeson
                                            Title:   Vice President


                                            MESA OPERATING CO.



                                            By:   /s/   M. Garrett Smith
                                            -------------------------------
                                            Name:    M. Garrett Smith
                                            Title:   Vice President



<PAGE>




                                                                   EXHIBIT 10.6


                 AMENDMENT TO 1990 GATHERING AGREEMENT AMENDMENT


     This  Amendment to 1990 Gathering  Agreement  Amendment  ("Amendment"),  is
entered into between COLORADO INTERSTATE GAS COMPANY ("CIG") and Pioneer Natural
Resources USA, Inc. f/k/a Mesa Operating Co. ("PNRUSA"),  and is dated September
1, 1997, but effective as provided below.  CIG and PNRUSA are referred to herein
individually as "Party" or collectively as the "Parties."

     WHEREAS,  the Parties'  predecessors  entered  into that certain  Agreement
dated January 3, 1928, as amended, commonly known as the 'B' Contract;

     WHEREAS,   CIG's  and   PNRUSA's   predecessor   entered  into  an  Amended
Supplemental  Stipulation  and  Agreement  dated June 19, 1991,  approved by the
Federal Energy Regulatory Commission ("FERC") in Docket Nos. RP79-59 and RP90-69
("ASSA"), which modified the 'B' Contract as set forth therein;

     WHEREAS,  CIG and PNRUSA's  predecessor entered into that certain Gathering
Agreement,  dated May 29, 1987, as amended  ("1987 GA"), the provisions of which
superseded certain provisions of the 'B' Contract;

     WHEREAS,  certain provisions of the Amendment to Gathering  Agreement dated
July 15, 1990, as heretofore amended ("1990 GA Amendment") are tied, in part, to
the term and other provisions of the ASSA;

     WHEREAS, the Parties have entered into an ASSA Termination  Agreement dated
September 1, 1997, which - upon taking effect - will terminate the ASSA, and the
Parties  wish to  provide  for the  impact  of  termination  of the ASSA on such
provisions of the 1990 GA Amendment;

     NOW, THEREFORE, in consideration of the covenants and obligations set forth
herein and other good and valuable consideration, the sufficiency and receipt of
which is hereby acknowledged, CIG and PNRUSA agree as follows:

     1. This Amendment shall not become effective,  and shall be of no force and
effect,  unless and until the ASSA Termination  Agreement  becomes  effective in
accordance  with the provisions  thereof.  This Amendment  shall,  upon the ASSA
Termination  Agreement so becoming  effective,  take effect October 1, 1997, and
shall  remain in effect  until the 1990 GA  Amendment  (as  amended  hereby)  is
terminated in accordance with its terms.

     2. All references to "Mesa Operating Limited Partnership" and "MESA" in the
1990 GA Amendment are hereby deleted and "Pioneer  Natural  Resources USA, Inc."
(or "PNRUSA") substituted therefor.


                                        1

<PAGE>



     3.  The last  textual  paragraph  of  numbered  paragraph  2 of the 1990 GA
Amendment is deleted and replaced with the following:

     CIG  and PNRUSA  agree that CIG will  provide  PNRUSA with a minimum of 100
     psig delivery  pressure  at  the outlet  of CIG's  meter  station  at Field
     Station 20 on as  consistent a  basis  as is  practicable in  light  of the
     prudent operation of the Gathering System. If CIG's failure to do so is the
     cause  for  PNRUSA  being  unable  to take  the volume of  Net 'B' Contract
     Production  to  which  PNRUSA  is  entitled  pursuant  to the 'B'  Contract
     Production Allocation Agreement dated January 1, 1991, as amended  ("PAA"),
     PNRUSA  shall  have  the  right  to reduce  the maximum number of Peak Days
     described  in the Amended Peak Day Gas Purchase Agreement,  dated  June 19,
     1991, as amended ("1991  PDGPA") as follows.  PNRUSA may reduce the maximum
     number of Peak Days in a Fiscal  Year (as such term is defined  in the 1991
     PDGPA)  by  one day for  each day  in such  Fiscal Year that CIG  failed to
     comply with the  foregoing delivery pressure obligation,  until the maximum
     number of Peak Days has  been reduced to zero.  Provided,  however,  PNRUSA
     shall  provide written notice to CIG describing the alleged  failure of CIG
     to comply  with such delivery pressure obligation as soon as possible after
     the alleged occurrence.  Further, as set forth in Paragraph 2 of the Letter
     Agreement between  the Parties dated  December 12, 1996,  and in the Letter
     Agreement  between  the  Parties  dated  April 23, 1997,  CIG  shall  be in
     compliance  with the foregoing delivery pressure  obligation so long as CIG
     is in compliance (or deemed  to be in compliance) with the  obligations set
     forth in Section 2.1 of the 1996 Fain Gas Processing Agreement.  Such right
     by PNRUSA to reduce the  maximum number of Peak Days shall be PNRUSA's sole
     remedy  in the  event  CIG fails  to  comply  with  the foregoing  delivery
     pressure  obligation. CIG and  PNRUSA further agree that  the  facility and
     operating  costs associated  with any new facilities  required to meet such
     delivery  pressure  obligation  shall be  treated in accordance  with  this
     Gathering Agreement, as amended.

     4.  Numbered  Paragraph 4 of the 1990 GA  Amendment,  as amended by section
12.14 of the 'B' Contract Production Allocation Agreement dated January 1, 1991,
is deleted in its entirety and replaced with the following:

     This  July 15,  1990,  Amendment to Gathering Agreement,  as amended, shall
     continue  in  full  force  and effect  from July 15,  1990,  until the ASSA
     Termination Agreement dated September 1, 1997, is  terminated in accordance
     with its terms.  Upon  such  termination,  the terms and  provisions of the
     Gathering Agreement, as otherwise amended, shall remain as if this July 15,
     1990 Amendment to Gathering Agreement was never entered into.

     5. The terms and  provisions of the 'B'  Contract,  the 1987 GA and 1990 GA
Amendment, as previously amended and as amended by this Amendment,  shall remain
in full force and effect.

                                        2

<PAGE>


     IN  WITNESS  WHEREOF,  the  Parties  hereto  have  hereunto  executed  this
Amendment.

COLORADO INTERSTATE GAS COMPANY



By:   /s/   C. Scott Hobbs
      ---------------------------
         C. Scott Hobbs
         Chief Operating Officer and
         Executive Vice President


PIONEER NATURAL RESOURCES USA INC.



By:   /s/   Dennis E. Fagerstone
      ---------------------------
         Dennis E. Fagerstone
         Executive Vice President


                                        3

<PAGE>




                                                                   EXHIBIT 10.7

                        PIONEER NATURAL RESOURCES COMPANY
                               SEVERANCE AGREEMENT


     This Severance  Agreement  (this  "Agreement")  is entered into,  effective
August  8,  1997,   between  Pioneer  Natural  Resources   Company,  a  Delaware
corporation ("Parent"),  and Scott D. Sheffield (the "Officer"). As used in this
Agreement,  the term "Company"  shall be deemed to include Parent and its direct
or indirect wholly-owned subsidiaries.

                                    Recitals

     A. Officer is currently serving as an officer of Parent. Parent and Officer
desire  to  enter  into an  agreement  governing  certain  matters  relating  to
Officer's employment with the Company,  including compensation  arrangements and
restrictions on Officer's use of Company information.

     B.  Parent  acknowledges  that  Officer is a  significant  employee  of the
Company,  possessing skills and knowledge instrumental to the successful conduct
of the  Company's  business.  Parent  is  willing  to  enter  into  a  severance
arrangement  with  Officer  in order to better  ensure  itself of the  continued
management  services of Officer for itself and its subsidiaries and, in part, to
induce  Officer to continue to provide  those  services  and subject  himself to
certain restrictions regarding the use of Company information.

     C.  Officer is willing to  subject  himself to the  restrictions  mentioned
above in part to induce  Parent to enter into a  compensation  arrangement  that
provides  for,  among other  things,  the payment of certain  benefits  upon the
termination of Officer's employment under certain circumstances.

     Now,  therefore,  for and in  consideration  of the  mutual  covenants  and
agreements set forth herein and for other good and valuable  consideration,  the
receipt and  sufficiency of which are hereby  acknowledged,  the parties to this
Agreement hereby agree as follows:

     1.  Position and Duties.  Officer shall serve Parent as President and Chief
Executive Officer, and, in so doing, shall report to Parent's Board of Directors
(the   "Board").   Officer  shall  have   supervision   and  control  over,  and
responsibility  for, such  management and  operational  functions of the Company
currently  assigned  to such  position,  and shall have such other or  different
powers  and  duties  (including  holding  officer  positions  with  one or  more
subsidiaries of Parent), as may from time to time be prescribed by the Board, so
long as such  functions,  powers and duties are  reasonable  and customary for a
President  and Chief  Executive  Officer  serving an  enterprise  comparable  to
Parent.

     2.  Devotion of  Efforts.  So long as Officer is serving the Company in the
capacities  described  in  Section 1, he shall  devote his full time,  skill and
attention and his best efforts during normal  business hours to the business and
affairs of the  Company to the extent  necessary  to  discharge  faithfully  and
efficiently his duties and  responsibilities  described in Section 1, except for
usual,  ordinary and customary periods of vacation and absence due to illness or
other  disability  or such  periods of  leave as are  approved in writing by the

                                        1

<PAGE>



Board.  The provisions of this Section shall not be construed to prevent Officer
from making  investments  in other  businesses or  enterprises,  so long as such
investments  do not violate  the  Company's  conflict  of  interest  policies or
require the provision of services by Officer to such  businesses or  enterprises
to an extent that would  interfere in any material  respect with the performance
of Officer's duties and responsibilities to the Company.

     3.  Compensation.

     (a) Base Salary. As compensation for Officer's services,  the Company shall
pay Officer an annualized base salary of a specified amount per annum (the "Base
Salary").  The Base Salary shall be payable in substantially  equal semi-monthly
installments.  The  Compensation  Committee  of  the  Board  (the  "Compensation
Committee")  may  review  the  Base  Salary  periodically  and  may  grant  such
increases,  or effect such  reductions,  in the Base Salary as the  Compensation
Committee considers appropriate in accordance with such compensation  guidelines
and policies as it may establish from time to time.  The Base Salary  applicable
from  time to time for any  period of  Officer's  employment  with the  Company,
commencing  on the  effective  date of this  Agreement,  shall be  identified on
Schedule A attached hereto,  which shall be amended  periodically to reflect any
increases or reductions effected by the Compensation Committee.

     (b) Bonuses.  Officer shall be entitled to receive (in addition to the Base
Salary) such annual or other  periodic bonus as the  Compensation  Committee may
award in accordance  with such  compensation  guidelines  and policies as it may
establish from time to time.

     (c) Other Benefits. Officer shall be entitled to participate in, or receive
benefits under,  any employee  benefit plan or other  arrangement made available
now or in the  future by the  Company  to the  officers  of  Parent (a  "Benefit
Plan"),  subject to the terms,  conditions  and overall  administration  of such
Benefit Plan.  Officer's  participation  in, or receipt of benefits  under,  any
Benefit Plan shall be in addition to (and not in lieu of) the Base Salary.

     (d) Vacations and Holidays. Officer shall be entitled to the number of paid
vacation days in each  calendar year  determined by Parent from time to time for
its officers and shall be entitled to all paid holidays  given by the Company to
its employees in general.

     4.  Relocation.  Officer  shall be  required  to  perform  his  duties  and
responsibilities  hereunder at Parent's offices located in Irving, Texas. If the
Company  requires  Officer to perform  his  duties and  responsibilities  at any
location that is more than 50 miles from the nearest border of Irving,  Texas (a
"New  Location") and,  within 30 days after  receiving  notice thereof,  Officer
accepts such relocation  rather than terminating his employment with the Company
pursuant to Section 5(a), the Company shall pay to Officer,  or shall  reimburse
Officer for (upon submission of reasonably detailed evidence thereof), such sums
as are  provided  for  under the  Relocation  Policy  for  Exempt  Employees  as
established by Parent.

                                        2

<PAGE>



     5.  Termination of Employment.

     (a) Right to Terminate.  Officer's  employment with the Company  (including
his officer position with Parent) shall be terminated upon the death, Disability
(as  defined in  subsection  (f)(3) of this  Section) or Normal  Retirement  (as
defined in subsection (f)(6) of this Section) of Officer. In addition, Officer's
employment with the Company  (including his officer position with Parent) may be
terminated  at any time and for any reason as a result of a  dismissal  or other
action by the Company or as a result of a voluntary action by Officer.  Any such
termination  of  employment  is  referred  to  herein  as  a   "Termination   of
Employment."

     (b)  Notice of Termination.

     (1)  Any  Termination  of  Employment  that  is  the  result  of  Officer's
          Disability  shall be  communicated  by the  Company  to  Officer  in a
          written notice  thereof.  Such notice shall state that, in the opinion
          of the  Board,  Officer  is  suffering  from  a  Disability  and  such
          Disability is the reason for the Termination of Employment.

     (2)  Any Termination of Employment  that is the result of Officer's  Normal
          Retirement  shall be  communicated  by  Officer to Parent by a written
          notice  thereof.  Such notice shall state that Officer is retiring and
          shall specify the date of such Termination of Employment,  which shall
          be not less than 30 days following the date such notice is received by
          Parent.

     (3)  Any  Termination  of  Employment  that is the result of a dismissal or
          other  action  by the  Company  (but is not the  result  of  Officer's
          Disability)  shall be  communicated  by the  Company  to  Officer by a
          written notice thereof. Such notice shall state whether or not (in the
          Company's  opinion)  the  Termination  of  Employment   constitutes  a
          Termination  for  Cause  (as  defined  in  subsection  (f)(7)  of this
          Section)  and, if so, shall set forth in  reasonable  detail facts and
          circumstances constituting a basis for such Termination for Cause.

     (4)  Any Termination of Employment that is the result of a voluntary action
          by Officer  (but is not the  result of  Officer's  Normal  Retirement)
          shall be  communicated by Officer to Parent by written notice thereof.
          Such notice  shall state  whether or not (in  Officer's  opinion)  the
          Termination  of Employment  constitutes a Termination  for Good Reason
          (as defined in  subsection  (f)(8) of this  Section) and, if so, shall
          set forth in reasonable detail the facts and circumstances  claimed as
          the basis for such Termination for Good Reason. Such notice shall also
          specify  the date of such  Termination  of  Employment,  which (if the
          Termination of Employment  does not constitute a Termination  for Good
          Reason) shall be not less than 30 days  following the date such notice
          is received by Parent.

     (c) Date of Termination of Employment.  For purposes of this Agreement, the
date  of a  Termination  of  Employment  shall  be  (1) if  the  Termination  of
Employment is the result of Officer's  death, the date of such death, (2) if the
Termination  of  Employment is the result of Officer's  Disability,  the date on
which the notice  described in subsection (b) (1) of this Section is received by

                                        3

<PAGE>



Officer,  (3) if the Termination of Employment is the result of Officer's Normal
Retirement,  the date specified in the notice described in subsection  (b)(2) of
this Section,  (4) if the Termination of Employment is the result of a dismissal
or other action by the Company (but is not the result of Officer's  Disability),
the date on which the notice  described in subsection  (b)(3) of this Section is
received by the Officer,  and (5) if the Termination of Employment is the result
of a  voluntary  action by Officer  (but is not the result of  Officer's  Normal
Retirement),  the date specified in the notice described in subsection (b)(4) of
this Section.

     (d)  Payments  Due  Upon  Termination  of  Employment.  The  provisions  of
subsections  (d)(1) and (d)(3) of this Section shall apply to any Termination of
Employment,  whether occurring prior to, at the time of or at any time following
a Change in Control (as defined in subsection  (f)(2) of this Section);  and the
provisions  of  subsection  (d)(2)  of  this  Section  shall  apply  only to any
Termination of Employment prior to a Change in Control.

     (1)  Death,  Disability  or  Normal  Retirement.   If  the  Termination  of
          Employment  is the result of  Officer's  death,  Disability  or Normal
          Retirement, the Company shall pay the following amounts to Officer (or
          his estate or personal representative):

          (A)  The  Base  Salary  (at the  rate in  effect  on the  date of such
               Termination of  Employment,  as identified on Schedule A) through
               and including the date of such Termination of Employment,  to the
               extent not already  paid,  which  amount shall be paid in cash on
               the  first   normal   semi-monthly   Base  Salary   payment  date
               immediately   succeeding   the  date  of  such   Termination   of
               Employment;

          (B)  Any amounts arising from Officer's  participation in, or benefits
               under,  any Benefit Plan through and  including  the date of such
               Termination  of  Employment,  which  amounts  shall be payable in
               accordance  with the terms and  conditions  of such Benefit Plan;
               and

          (C)  An amount  equal to one full  year's  Base Salary (at the rate in
               effect  on  the  date  of  such  Termination  of  Employment,  as
               identified  on Schedule  A),  which  amount shall be paid in cash
               within  30  days  following  the  date  of  such  Termination  of
               Employment.

     (2)  Termination  for Good Reason or Not for Cause.  If the  Termination of
          Employment  (i) is the result of a  dismissal  or other  action by the
          Company (but is not the result of Officer's  Disability)  and does not
          constitute  a  Termination  for  Cause  or  (ii)  is the  result  of a
          voluntary action by Officer (but is not the result of Officer's Normal
          Retirement) and constitutes a Termination for Good Reason, the Company
          shall pay the following amounts, and provide the following benefits to
          Officer:

          (A)  The  Base  Salary  (at the  rate in  effect  on the  date of such
               Termination of  Employment,  as identified on Schedule A) through
               and including the date of such  Termination of Employment,  which
               amount shall be paid in cash on the date of such  Termination  of
               Employment;

                                        4

<PAGE>




          (B)  Any amount arising from Officer's  participation  in, or benefits
               under,  any Benefit Plan through and  including  the date of such
               Termination  of  Employment,  which  amounts  shall be payable in
               accordance with the terms and conditions of such Benefit Plan;

          (C)  An amount  equal to one full  year's  Base Salary (at the rate in
               effect  on  the  date  of  such  Termination  of  Employment,  as
               identified  on Schedule A), which amount shall be paid in cash on
               the date of such Termination of Employment;

          (D)  For a period of one year  following the date of such  Termination
               of Employment,  a continuation of all health  insurance  coverage
               applicable  at the  time of such  Termination  of  Employment  to
               Officer and his immediate family under any Benefit Plan; and

          (E)  With respect to a Termination of Employment  described in Section
               5(d)(2)(i),   an  amount  equal  to  one-twelfth  (1/12)  of  the
               Officer's Base Salary,  which amount shall be paid in cash on the
               date of such Termination of Employment.

     (3)  Termination  for Cause or Not for Good Reason.  If the  Termination of
          Employment  (i) is the result of a  dismissal  or other  action by the
          Company  (but  is  not  the  result  of  Officer's   Disability)   and
          constitutes  a  Termination  for  Cause  or  (ii) is the  result  of a
          voluntary action by Officer (but is not the result of Officer's Normal
          Retirement) and does not constitute a Termination for Good Reason, the
          Company shall pay the following amounts to Officer:

          (A)  The  Base  Salary  (at the  rate in  effect  on the  date of such
               Termination of  Employment,  as identified on Schedule A) through
               and including the date of such  Termination of Employment,  which
               amount  shall be paid in cash on the  first  normal  semi-monthly
               Base Salary payment date immediately  succeeding the date of such
               Termination of Employment; and

          (B)  Any amounts arising from Officer's  participation in, or benefits
               under,  any Benefit Plan through and  including  the date of such
               Termination  of  Employment,  which  amounts  shall be payable in
               accordance with the terms and conditions of such Benefit Plan.

     (4)  Payment Contingent on Release. If Officer's  Termination of Employment
          is prior to a Change in Control (and only in that event),  and Officer
          is otherwise  entitled to the payment provided in subsection (d)(2) of
          this Section,  then such payment  shall be subject to, and  contingent
          upon,  Officer's  execution of a General Release Agreement in favor of
          the  Company  in  substantially  the  form  and  substance  as the one
          attached hereto as Schedule B.

                                        5

<PAGE>



     (e)  Additional   Provisions  Applicable  Upon  Termination  of  Employment
Concurrent with or Following Change in Control.  The following  provisions shall
apply to any Termination of Employment  occurring at the time of, or at any time
within one year following, a Change in Control.

     (1)  Termination  for Good Reason or Not for Cause.  If the  Termination of
          Employment  (i) is the result of a  dismissal  or other  action by the
          Company (but is not the result of Officer's  Disability)  and does not
          constitute  a  Termination  for  Cause,  or  (ii) is the  result  of a
          voluntary action by Officer (but is not the result of Officer's Normal
          Retirement) and constitutes a Termination for Good Reason, the Company
          shall pay the following amounts,  and provide the following  benefits,
          to Officer:

          (A)  The  Base  Salary  (at the  rate in  effect  on the  date of such
               Termination of  Employment,  as identified on Schedule A) through
               and including the date of such  Termination of Employment,  which
               amount shall be paid in cash on the date of such  Termination  of
               Employment;

          (B)  A lump sum in cash equal to 2.99  times the sum of (i)  Officer's
               Base  Salary  (at  the  rate  in  effect  on  the  date  of  such
               Termination  of  Employment,  as  identified on Schedule A), plus
               (ii) the greater of the then  current  year's  targeted  bonus or
               actual  bonus award (if  applicable)  for  Officer,  which amount
               shall  be  paid  in cash  on the  date  of  such  Termination  of
               Employment;

          (C)  Any amount arising from Officer's  participation  in, or benefits
               under,  any Benefit Plan through and  including  the date of such
               Termination  of  Employment,  which  amounts  shall be payable in
               accordance with the terms and conditions of such Benefit Plan;

          (D)  For a period of one year  following the date of such  Termination
               of Employment,  a continuation of all health  insurance  coverage
               applicable  at the  time of such  Termination  of  Employment  to
               Officer and his immediate family under any Benefit Plan; and

          (E)  With respect to a Termination of Employment  described in Section
               5(e)(1)(i),   an  amount  equal  to  one-twelfth  (1/12)  of  the
               Officer's Base Salary,  which amount shall be paid in cash on the
               date of such Termination of Employment.

     (2)  Voluntary  Termination  Not for Good  Reason.  If the  Termination  of
          Employment  is the result of a voluntary  action by Officer,  does not
          constitute  a  Termination  for Good  Reason  and either (A) occurs at
          least six  months,  but not more than one year,  following a Change in
          Control or (B)  occurs at the time of, or at any time  within one year
          following,  a Change in Control and following the Company's  requiring
          the Officer to perform his duties and responsibilities  hereunder at a
          New Location,  which  relocation is not accepted by Officer  within 30
          days after  receiving  notice  thereof,  then the Company shall pay to
          Officer  all  amounts  that would be payable  pursuant  to  subsection
          
                                        6

<PAGE>



         (d)(2) of this Section  had such  Termination  of  Employment  occurred
         prior to the Change in  Control and  constituted a Termination for Good
         Reason.

     (3)  Excise Tax and Gross-Up Payment.

          (A)  If any  portion  of such  compensation  constitutes  a  parachute
               payment   (a   "Payment"   and  is  subject  to  the  Excise  Tax
               (hereinafter  defined),   then  Company  shall,  in  addition  to
               providing   such   compensation,   pay   the   Gross-Up   Payment
               (hereinafter  defined) to Officer in the manner  described below.
               For purposes of this  Agreement,  (i) "Excise Tax" shall mean the
               tax imposed pursuant to section 4999 of the Code and any interest
               or penalties  incurred by the Officer with respect to such Excise
               Tax, and (ii) "Gross-Up  Payment" shall mean, with respect to any
               compensation  provided  to  the  Officer  by  Company  (including
               without limitation the payments provided for under this Agreement
               and any payments to the Officer under any employee  benefit plan,
               including without  limitation the Company's  Long-term  Incentive
               Plan, or other arrangement) that is subject to the Excise Tax, an
               amount  that,  after  reduction  of the  amount of such  Gross-Up
               Payment for all  federal,  state,  and local tax  (including  any
               interest  or  penalties  imposed  with  respect to such taxes) to
               which the Gross-Up  Payment is subject  (including the Excise Tax
               to which the Gross-Up Payment is subject), is equal to the amount
               of the Excise  Tax to which such  compensation  is  subject.  For
               purposes  of  determining  the  amount of any  Gross-Up  Payment,
               Officer  shall  be  deemed  to pay  federal  income  taxes at the
               highest  marginal rate of taxation and state and local taxes,  if
               applicable, at the highest marginal rate of taxation in the state
               and  locality  of  residence  of  the  Officer  on  the  Date  of
               Termination, net of the maximum reduction in federal income taxes
               that could be  obtained  from  deduction  of such state and local
               taxes, if any.

          (B)  Subject  to  the   provisions  of  subsection   5(e)(3)(C),   all
               determinations required to be made under this subsection 5(e)(3),
               including  whether and when a Gross-Up  Payment is required,  the
               amount  of  such  Gross-Up  Payment  and  the  assumptions  to be
               utilized in arriving at such determination,  shall be made by the
               accounting  firm which performed the audit of the Company for the
               year  preceding the year in which the Change in Control  occurred
               (the "Accounting  Firm") which shall provide detailed  supporting
               calculations  both to the  Company  and  the  Officer  within  15
               business  days of the  receipt of notice  from the  Officer  that
               there has been a Payment, or such earlier time as is requested by
               the Company.  In the event that the Accounting Firm is serving as
               accountant  or  auditor  for  the  individual,  entity  or  group
               effecting  the  Change in  Control,  the  Officer  shall  appoint
               another  nationally   recognized  accounting  firm  to  make  the
               determinations  required  hereunder (which  accounting firm shall
               then be referred to as the Accounting Firm  hereunder).  All fees
               and expenses of the Accounting  Firm shall be borne solely by the
               Company.  Any Gross-Up  Payment,  as determined  pursuant to this
               subsection  5(e)(3),  shall be paid by the Company to the Officer
               within  five  days  of  the  receipt  of  the  Accounting  Firm's
               determination.  If the Accounting  Firm determines that no Excise
               Tax is payable by the Officer,  it shall furnish the Officer with
               a written  opinion  that  failure to report the Excise Tax on the

                                        7

<PAGE>



               Officer's  applicable federal  income or excise tax  return would
               not result in the imposition of a negligence or  similar penalty.
               Any  determination  by the Accounting Firm shall be binding  upon
               the Company and the Officer.

          (C)  The Officer  shall  notify the Company in writing of any claim by
               the Internal  Revenue Service that, if successful,  would require
               the  payment  by  the  Company  of  the  Gross-Up  Payment.  Such
               notification shall be given no later than ten business days after
               the Officer is  informed  in writing of such  claim.  The Officer
               shall not pay such claim  prior to the  expiration  of the 30-day
               period  following  the date on which it gives such  notice to the
               Company  (or such  shorter  period  ending  on the date  that any
               payment  of taxes  with  respect  to such  claim is due).  If the
               Company  notifies the Officer in writing prior to the  expiration
               of such  period that it desires to contest  such  claim,  (i) the
               Officer  shall accept legal  representation  with respect to such
               claim by an attorney  reasonably  selected by the  Company,  (ii)
               cooperate  with the Company in good faith in order to effectively
               contest such claim,  and (iii) permit the Company to  participate
               in any proceedings relating to such claim; provided, however, the
               Company  shall  bear and pay  directly  all  costs  and  expenses
               (including legal and accounting fees and additional  interest and
               penalties)  incurred in  connection  with such  contest and shall
               indemnify and hold the Officer  harmless,  on an after-tax basis,
               for  any  Excise  Tax  or  income  tax  (including  interest  and
               penalties  with  respect  thereto)  imposed  as a result  of such
               representation  and  payment of costs and  expenses.  The Company
               shall  control  all  proceedings  taken in  connection  with such
               contest  to the extent  relating  to issues  impacting  whether a
               Gross-Up  Payment  is payable  hereunder.  The  Officer  shall be
               entitled  to settle  or  contest,  as the case may be,  any other
               issue raised by the Internal  Revenue Service or any other taxing
               authority in connection with such contest.

          (D)  If any such claim referred to in subsection 5(e)(3)(C) is made by
               the Internal Revenue Service and the Company does not request the
               Officer to contest the claim within the 30-day  period  following
               notice of the claim,  the  Company  shall pay to the  Officer the
               amount  of any  Gross-Up  Payment  owed to the  Officer,  but not
               previously  paid pursuant to subsection  5(e)(3)(B),  immediately
               upon the expiration of such 30-day  period.  If any such claim is
               made by the Internal Revenue Service and the Company requests the
               Officer to  contest  such  claim,  the  Company  shall pay to the
               Officer the amount of any  Gross-Up  Payment owed to the Officer,
               but not  previously  paid  under  the  provisions  of  subsection
               5(e)(3)(B),  within  five  days of a Final  Determination  of the
               liability  of the Officer for such  Excise Tax.  For  purposes of
               this Agreement,  a "Final Determination" shall be deemed to occur
               with  respect to a claim when (i) there is a decision,  judgment,
               decree  or other  order by any court of  competent  jurisdiction,
               which decision, judgment, decree or other order has become final,
               i.e.,  all allowable  appeals have been exhausted by either party
               to the  action,  (ii)  there is a closing  agreement  made  under
               Section  7121 of the Code,  or (iii) the time for  instituting  a
               claim for refund has expired,  or if a claim was filed,  the time
               for instituting suit with respect thereto has expired.

                                        8

<PAGE>




     (4)  Letter of Credit.  Following  a Change in Control,  Parent  (within 10
          days following receipt of Officer's written request therefor),  at its
          sole cost and expense, shall post an irrevocable letter of credit with
          a banking  institution  reasonably  acceptable to Officer in an amount
          equal to the maximum  amount of the aggregate cash payments that would
          be made to Officer pursuant to the provisions of paragraph (1) of this
          subsection if the provisions of paragraph (1) of this  subsection were
          to become  applicable.  Such letter of credit shall contain provisions
          making the funds available  thereunder to Officer by Officer's  drafts
          drawn at sight at any  time  and from  time to time.  Such  provisions
          shall permit Officer to present drafts  (including  drafts for partial
          draws)  drawn at sight by  presentation  by Officer to the  applicable
          banking  institution  of a written  statement  to the effect  that the
          Company is in default on a payment to be made to Officer  pursuant  to
          the terms of this Agreement  (setting forth the amount of such payment
          in  default)  and that  Officer is not in default  under,  and has not
          breached the terms of, this  Agreement.  Parent shall continue to keep
          such  letter of credit in place  until the  expiration  of at least 60
          days following the date of a Termination of Employment occurring after
          the Change in Control.

     (5)  Retirement Benefits Funded. Upon a Change in Control,  any accrued but
          unfunded  retirement  benefit  obligations  to Officer  under any then
          existing  retirement  plan shall be fully  funded to a Rabbi Trust for
          the benefit of such Officer, which amount shall be paid in cash on the
          date of such Change in Control.

     (f)  Certain  Definitions.  As used in the Section  and  elsewhere  in this
Agreement, the following terms shall have the respective meanings indicated:

     (1)  "Across-the-Board Salary Reduction" shall mean a reduction in the Base
          Salary  that  is a  part of,  and is  at a  rate  consistent  with,  a
          reduction in  the base salaries paid to substantially  all officers of
          Parent.

     (2)  "Change in Control"  shall mean the occurrence of any of the following
          events:

          (A)  The  acquisition by any  individual,  entity or group (within the
               meaning  of  Section  13(d)(3)  or  14(d)(2)  of  the  Securities
               Exchange Act of 1934, as amended (the"Exchange Act")) (a"Person")
               of  beneficial  ownership  (within  the  meaning  of  Rule  13d-3
               promulgated  under the Exchange Act) of 20% or more of either (x)
               the  then   outstanding   shares  of   common   stock  of  Parent
               (the"Outstanding Parent Common Stock") or (y) the combined voting
               power  of  the  then  outstanding  voting  securities  of  Parent
               entitled  to  vote   generally   in  the  election  of  directors
               (the"Outstanding Parent Voting Securities");  provided,  however,
               that  for  purposes  of  this   subsection   (A),  the  following
               acquisitions  shall not  constitute a Change of Control:  (i) any
               acquisition directly from Parent, (ii) any acquisition by Parent,
               (iii) any  acquisition  by any employee  benefit plan (or related
               trust)  sponsored  or  maintained  by Parent  or any  corporation
               controlled by  Parent or  (iv) any acquisition by any corporation

                                        9

<PAGE>



               pursuant to a  transaction  which complies with clauses (i), (ii)
               and (iii) of paragraph (C) below; or

          (B)  Members of the Incumbent Board cease for any reason to constitute
               at least a majority of the Board; or

          (C)  Consummation of a reorganization, merger or consolidation or sale
               or other disposition of all or substantially all of the assets of
               Parent  or  an  acquisition  of  assets  of  another  corporation
               (a"Business  Combination"),  in each case, unless, following such
               Business  Combination,  (i)  all  or  substantially  all  of  the
               individuals   and  entities  who  were  the  beneficial   owners,
               respectively,   of  the  Outstanding   Parent  Common  Stock  and
               Outstanding  Parent Voting  Securities  immediately prior to such
               Business  Combination  beneficially  own, directly or indirectly,
               more than 50% of,  respectively,  the then outstanding  shares of
               common  stock  and  the   combined   voting  power  of  the  then
               outstanding  voting securities  entitled to vote generally in the
               election  of  directors,  as the case may be, of the  corporation
               resulting  from such  Business  Combination  (including,  without
               limitation,  a corporation  which as a result of such transaction
               owns Parent or all or substantially all of Parent's assets either
               directly or through one or more  subsidiaries)  in  substantially
               the same  proportions as their  ownership,  immediately  prior to
               such Business  Combination of the Outstanding Parent Common Stock
               and  Outstanding  Parent Voting  Securities,  as the case may be,
               (ii) no Person  (excluding any employee  benefit plan (or related
               trust) of Parent or the corporation  resulting from such Business
               Combination)  beneficially owns,  directly or indirectly,  20% or
               more of,  respectively,  the then  outstanding  shares  of common
               stock of the corporation resulting from such Business Combination
               or the  combined  voting  power  of the then  outstanding  voting
               securities  of such  corporation  except to the extent  that such
               ownership  results  solely from  ownership of Parent that existed
               prior to the Business  Combination  and (iii) at least a majority
               of the  members  of the  board of  directors  of the  corporation
               resulting  from such  Business  Combination  were  members of the
               Incumbent  Board  at the  time of the  execution  of the  initial
               agreement,  or of the  action of the  Board,  providing  for such
               Business Combination; or

          (D)  Approval by the shareholders of Parent of a complete  liquidation
               or dissolution of Parent; or

          (E)  Consummation of a Business Combination not otherwise constituting
               a Change of Control but,  pursuant to which the Person serving as
               Chief  Executive  Officer  at the  time of the  execution  of the
               initial  agreement is removed from, or replaced in, such capacity
               with  respect to the  corporation  resulting  from such  Business
               Combination.

     (3)  "Disability"  shall mean  Officer's  physical or mental  impairment or
          incapacity  of sufficient severity  that, in the opinion of the Board,
          either (A) Officer is  unable  to continue  to perform  his duties and

                                       10

<PAGE>



          responsibilities hereunder or (B) Officer's condition  entitles him to
          disability  benefits  under any Benefit Plan providing for the payment
          thereof.

     (4)  "Excessive  Salary  Reduction"  shall mean (A) a reduction in the Base
          Salary that is not an Across-the-Board Salary Reduction (as defined in
          paragraph (1) of this subsection) and that, when combined with the net
          effect of all prior increases and reductions in the Base Salary (other
          than prior reductions that were Across-the-Board  Salary  Reductions),
          results in  the  Base Salary  being less than 80% of the  highest Base
          Salary to  which  Officer  has  ever  been  subject  pursuant to  this
          Agreement (as identified on Schedule A) or (B) a reduction in the Base
          Salary  (whether  or nor an  Across-the-Board  Salary Reduction) that,
          when combined  with  the  net  effect  of  all  prior   increases  and
          reductions in the Base Salary  (whether or not Across-the-Board Salary
          Reductions),  results in  the Base Salary  being less than  65% of the
          highest Base Salary to which Officer has ever been subject pursuant to
          this Agreement (as identified on Schedule A).

     (5)  "Incumbent  Board" means the  individuals  who, as of the date of this
          Agreement, constitute the Board and any other individual who becomes a
          director of Parent  after that date and whose  election or  nomination
          for  election by Parent's  shareholders  was  approved by a vote of at
          least a majority of the directors then comprising the Incumbent Board,
          but excluding,  for this purpose,  any such  individual  whose initial
          assumption  of office  occurs  as a result of an actual or  threatened
          election  contest with respect to the election or removal of directors
          or other actual or threatened  solicitation  of proxies or consents by
          or on behalf of a Person other than the Incumbent  Board.

     (6)  "Normal  Retirement"  shall  have the  meaning  given to such  term in
          Section 1.27 of the Long-term Incentive Plan.

     (7)  "Termination  for Cause" shall mean a  Termination  of Employment as a
          result of a dismissal  or other  action by the Company  following  (A)
          Officer's  continued  failure to substantially  perform his duties and
          responsibilities  as  described  in  Section  1  (other  than any such
          failure  resulting  from  Officer's  physical or mental  impairment or
          incapacity)  after  written  demand  for  substantial  performance  is
          delivered  by the Board or the Chief  Executive  Officer  specifically
          identifying  the  manner in which  the  Board or the  Chief  Executive
          Officer,  as the case may be, believes  Officer has not  substantially
          performed such duties and responsibilities,  (B) Officer's engaging in
          misconduct that is materially injurious to the Company,  monetarily or
          otherwise, or (C) a material violation by Officer of the provisions of
          Section 6. For  purposes of clause (B) of this  paragraph,  an act, or
          failure to act, on Officer's part shall be  considered"misconduct"  if
          done, or omitted,  by Officer not in good faith and without reasonable
          belief that such act, or failure to act,  was in the best  interest of
          the Company.

     (8)  "Termination  for Good Reason" shall mean a Termination  of Employment
          as a result of  voluntary  action  by  Officer  within  30 days  after
          receiving  notice of (A) the  demotion  of the  Officer  to an officer
          position junior to the officer position specified in Section 1 or to a
          non-officer position, (B) an Excessive Salary Reduction (as defined in

                                       11

<PAGE>



         paragraph  (4)  of  this  subsection),  or (C) the failure by Parent to
         obtain the assumption  agreement described in Section 7(f)  on or prior
         to a succession described in Section 7(f).

     6.  Nonpublic Information.

     (a) Officer  hereby  acknowledges  that, in connection  with his employment
with the  Company,  he has  received,  and will  continue  to  receive,  various
information regarding the Company and its business,  operations and affairs. All
such information, to the extent not publicly available other than as a result of
a disclosure by Officer in violation of this Agreement, is referred to herein as
the"Nonpublic Information."

     (b)  Officer  hereby  agrees  that,  from and  after  the date  hereof  and
continuing until three (3) years following a Termination of Employment,  he will
keep all  Nonpublic  Information  confidential  and will not,  without the prior
written consent of the Board,  disclose any Nonpublic  Information in any manner
whatsoever or use any Nonpublic  Information  other than in connection  with the
performance of his services to the Company hereunder;  provided,  however,  that
the provisions of this subsection  shall not prevent Officer from (1) disclosing
any  Nonpublic  Information  to any  other  employee  of the  Company  or to any
representative  or agent of the  Company  (such  as an  independent  accountant,
engineer,  attorney or financial  advisor)  when such  disclosure  is reasonably
necessary  or  appropriate  (in  Officer's  judgment)  in  connection  with  the
performance  by  Officer of his duties  and  responsibilities  hereunder  or (2)
disclosing  any  Nonpublic  Information  as required by  applicable  law,  rule,
regulation or legal process (but only after  compliance  with the  provisions of
subsection (c) of this Section).

     (c) If Officer is requested  pursuant to, or required by,  applicable  law,
rule, regulation or legal process to disclose any Nonpublic Information, Officer
will notify Parent  promptly so that the Company may seek a protective  order or
other appropriate remedy or, in the Company's sole discretion,  waive compliance
with the terms of this Section,  and Officer will fully cooperate in any attempt
by the Company to obtain any such protective  order or other remedy.  If no such
protective order or other remedy is obtained,  or the Company waives  compliance
with the terms of this  Section,  Officer  will  furnish or  disclose  only that
portion of the Nonpublic  Information  as is legally  required and will exercise
all reasonable efforts to obtain reliable assurance that confidential  treatment
will be accorded the Nonpublic Information that is so disclosed.

     7.  Miscellaneous Provisions.

     (a) Mitigation. Officer shall not be required to mitigate the amount of any
payment provided for in this Agreement by seeking other employment or otherwise,
and the  amount  of any  payment  provided  for in this  Agreement  shall not be
reduced by any  compensation  earned by Officer as the result of  employment  by
another employer after the date of any Termination of Employment or otherwise.

                                       12

<PAGE>



     (b) Interest.  Until paid, all past due amounts  required to be paid by the
Company to Officer under any provision of this Agreement  shall bear interest at
the highest  non-usurious rate permitted by applicable  federal,  state or local
law.

     (c) Equitable Relief Available.  Officer  acknowledges that remedies at law
may be inadequate to protect the Company against any actual or threatened breach
of the provisions of Section 6 by Officer. Accordingly, without prejudice to any
other rights or remedies otherwise available to the Company, Officer agrees that
the Company shall have the right to equitable and  injunctive  relief to prevent
any breach of the  provisions  of Section 6, as well as to such damages or other
relief as may be  available  to the Company by reason of any such breach as does
occur.

     (d) Breach Not a Defense.  The representations and covenants on the part of
Officer  contained  in  Section  6  shall  be  construed  as  ancillary  to  and
independent of any other provision of this  Agreement,  and the existence of any
claim or cause  of  action  of  Officer  against  the  Company  or any  officer,
director,  stockholder or representative of the Company,  whether  predicated on
this Agreement or otherwise,  shall not constitute a defense to the  enforcement
by the Company of the covenants on the part of Officer contained in Section 6.

     (e) Notices.  Any notice or other communication  called for by the terms of
this  Agreement  shall be in  writing  and  either  delivered  personally  or by
registered or certified mail (postage prepaid and return receipt  requested) and
shall be deemed given when received at the following addresses (or at such other
address for a party as shall be specified by like notice):

     (1)  If to Parent or the Company,  1400  Williams  Square West,  5205 North
          O'Connor Boulevard, Irving, Texas 75039, Attention: General Counsel.

     (2)  If to  Officer,  the  address of  Officer  set forth  below  Officer's
          signature   on   the   signature   page   of   this   Agreement,   and
          marked"Confidential."

     (f)  Assumption by Successor of Parent.  Parent shall require any successor
(whether  direct or  indirect)  to all or  substantially  all of the business or
assets of Parent (whether by purchase of securities, merger, consolidation, sale
of  assets  or  otherwise),  by  a  written  agreement  in  form  and  substance
satisfactory  to  Officer,   to  expressly  assume  and  agree  to  perform  the
obligations to be performed by Parent or the Company under this Agreement in the
same manner and to the same extent that Parent or the Company  would be required
to perform if no such succession had taken place.

     (g)  Assignment.

     (1)  Except  pursuant  to  an  assumption  by  a  successor   described  in
          subsection  (f) of this  Section,  the rights and  obligations  of the
          Company pursuant to this Agreement may not be assigned, in whole or in
          part, by the Company to any other person or entity without the express
          written consent of Officer.

                                       13

<PAGE>



     (2)  The rights and  obligations of Officer  pursuant to this Agreement may
          not be assigned,  in whole or in part,  by Officer to any other person
          or entity without the express written consent of the Board.

     (h) Successors.  This Agreement shall be binding on, and shall inure to the
benefit of, the  Company,  Officer and their  respective  successors,  permitted
assigns, personal and legal representatives,  executors, administrators,  heirs,
distributees, devisees and legatees, as applicable.

     (i) Amendment and Waivers.  Except as hereinafter provided, no provision of
this Agreement may be amended or otherwise  modified,  and no right of any party
to this Agreement may be waived,  unless such amendment,  modification or waiver
is agreed to in a written instrument signed by Officer and Parent (and any dated
and signed  Schedule A, as described in subsection  (o) of this  Section,  shall
constitute such an instrument).  Beginning on the fifth  anniversary of the date
hereof,  unless a Change  of  Control  shall  have  occurred  or be  pending  or
contemplated, Parent may amend, modify, or waive any provision of, or terminate,
this  Agreement  upon sixty (60) days  notice  without  the  consent of Officer;
provided that any such amendment,  modification,  waiver or termination shall be
made to all  severance  agreements  of Parent  covering  all  officers of Parent
similarly  situated  to  Officer.  No  waiver  by  either  party  hereto  of, or
compliance with, any condition or provision of this Agreement to be performed by
the  other  party  hereto  shall be  deemed a waiver of  similar  or  dissimilar
provisions or conditions at the same or at any prior or subsequent time.

     (j) Complete  Agreement.  The provisions of this  Agreement  constitute the
complete  understanding  and  agreement  among the parties  with  respect to the
subject matter hereof, and no agreements or representations,  oral or otherwise,
express or implied,  with respect to the subject matter hereof have been made by
either party which are not set forth expressly in this Agreement.

     (k)  Governing  Law.  THIS  AGREEMENT IS BEING MADE AND EXECUTED IN, AND IS
INTENDED  TO BE  PERFORMED  IN,  THE  STATE OF  TEXAS  AND  SHALL  BE  GOVERNED,
CONSTRUED,  INTERPRETED AND ENFORCED IN ACCORDANCE WITH THE SUBSTANTIVE  LAWS OF
THE STATE OF TEXAS.

     (l) Attorney  Fees.  All legal fees and other costs  incurred by Officer in
connection  with  the  resolution  of any  dispute  or  controversy  under or in
connection with this Agreement shall be reimbursed by the Company to Officer, if
such dispute or controversy  is resolved in favor of Officer.  The Company shall
be  responsible  for, and shall pay, all legal fees and other costs  incurred by
the Company in  connection  with the  resolution  of any dispute or  controversy
under or in connection with this  Agreement,  regardless of whether such dispute
or controversy is resolved in favor of the Company or Officer.

     (m) Counterparts.  This Agreement may be executed in several  counterparts,
each of which shall be deemed to be an original,  but all of which together will
constitute one and the same agreement.

                                       14

<PAGE>



     (n) Construction.  The captions of the Sections, subsections and paragraphs
of this  Agreement  have been inserted as a matter of  convenience  of reference
only and shall not affect the  meaning  or  construction  of any of the terms or
provisions of this Agreement.  Unless  otherwise  specified,  references in this
Agreement  to  a"Section,""subsection,""paragraph,""subparagraph"   or"Schedule"
shall be considered to be references  to the  appropriate  Section,  subsection,
paragraph, subparagraph or Schedule, respectively, of this Agreement. Unless the
context otherwise requires, all words used in this Agreement in any gender shall
include the  masculine,  feminine and neuter  gender,  all singular  words shall
include the plural and all plural words shall include the  singular.  As used in
this Agreement, the term"including" shall mean"including, but not limited to."

     (o)  Schedule  A.  Schedule A may be  replaced at any time and from time to
time to reflect a change in the Base Salary; provided, however, that no Schedule
A  attached  hereto  shall be  effective  unless it  contains a date and bears a
signature of approval on behalf of Officer and a signature of approval on behalf
of Parent; and provided further,  however, that if at any time two or more dated
and signed  copies of Schedule A conflict  with each  other,  the later dated of
such copies shall control.

     (p) Validity and  Severability.  If any term or provision of this Agreement
is held to be illegal, invalid or unenforceable under the present or future laws
effective during the term of this Agreement, (1) such term or provision shall be
fully  severable,  (2) this Agreement shall be construed and enforced as if such
term or  provision  had never  comprised  a part of this  Agreement  and (3) the
remaining  terms and provisions of this Agreement shall remain in full force and
effect and shall not be affected by the illegal,  invalid or unenforceable  term
or provision or by its severance from this  Agreement.  Furthermore,  in lieu of
such illegal,  invalid or unenforceable term or provision,  there shall be added
automatically  as a part of this  Agreement,  a term or  provision as similar to
such illegal,  invalid or unenforceable term or provision as may be possible and
be legal, valid and enforceable.

     (q) Execution by Parent.  The  execution of this  Agreement by Parent shall
constitute  an  acceptance  of, and an  agreement  to be bound by, the terms and
provisions  of this  Agreement  by Parent and each of its  direct  and  indirect
wholly-owned subsidiaries,  and Parent hereby agrees to cause each of its direct
and indirect wholly-owned  subsidiaries,  now and in the future, to fully comply
with all  obligations  applicable  to the Company  pursuant to the terms of this
Agreement.

     (r) Effect on Other Rights.  Parker & Parsley Petroleum Company, a Delaware
corporation  ("PPPC"),  and Officer  have  previously  entered into that certain
Severance   Agreement   effective  January  1,  1996   (the"Original   Severance
Agreement"). Effective as of the date hereof, PPPC has merged with and into MESA
Operating Co., a Delaware  corporation  and a direct wholly owned  subsidiary of
Parent ("Merger Sub"), with Merger Sub being the surviving entity of such merger
(the"Merger").  Parent  hereby  expressly  assumes and agrees to perform  PPPC's
obligations under Section 5(e) of the Original  Severance  Agreement in the same
manner and to the same  extent  that PPPC  would be  required  to  perform  such
obligations, and Officer hereby acknowledges that the form and substance of such
assumption  is  satisfactory  to  Officer.  Each of Parent  and  Officer  hereby
acknowledges,  covenants and agrees that (i) the Merger constitutes  a"Change in
Control" (as such term is defined  in the  Original  Severance  Agreement), (ii)

                                       15

<PAGE>



the terms and  provisions of this  Agreement are not intended to, shall not, and
shall not be deemed to,  supersede,  limit or in any way affect any of Officer's
rights under Section 5(e) of the Original Severance Agreement to receive certain
payments  as a  result  of a  termination  of  Officer's  employment  with  PPPC
occurring  within  one year after  consummation  of the  Merger  (a"MESA  Merger
Termination"), and (iii) other than as set forth in Section 5(e) of the Original
Severance Agreement,  Officer shall not be entitled to receive any payment under
this  Agreement  as a result of a MESA  Merger  Termination.  Parent and Officer
hereby agree that,  except for the rights,  duties and obligations of Parent and
Officer arising as a result of a MESA Merger Termination as set forth in Section
5(e) of the Original Severance  Agreement,  the Original Severance  Agreement is
hereby completely and irrevocably terminated in all respects effective as of the
date hereof,  and all terms and provisions of the Original  Severance  Agreement
other than Section 5(e) as such section  relates to the MESA Merger  Termination
are replaced and  superseded in all respects by the terms and provisions of this
Agreement.



                            (SIGNATURE PAGE ATTACHED)

                                       16

<PAGE>



     In witness whereof,  the parties have executed this Agreement  effective as
of the date first written above.

                                    PIONEER NATURAL RESOURCES COMPANY



                                    By:        /s/ Mark L. Withrow
                                             -------------------------
                                    Name:    Mark L. Withrow
                                    Title:   Executive Vice President


                                    OFFICER:



                                               /s/ Scott D. Sheffield
                                             -------------------------
                                    Printed Name:

                                    Address:

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





              [Signature Page - Severance Agreement - Page 1 of 1]

<PAGE>





                 CONSENT OF PIONEER NATURAL RESOURCES USA, INC.

     Pioneer Natural Resources USA, Inc., a Delaware  corporation formerly named
MESA  Operating  Co. into which Parker & Parsley  Petroleum  Company was merged,
hereby consents to the partial termination,  replacement and supersession of the
Original  Severance  Agreement  (as  defined  in Section  7(r) of the  foregoing
Severance  Agreement)  to the extent  provided in Section 7(r) of the  foregoing
Severance Agreement.

                                    PIONEER NATURAL RESOURCES USA, INC.



                                    By:        /s/ Mark L. Withrow
                                             ------------------------
                                    Name:    Mark L. Withrow
                                    Title:   Executive Vice President






              [Signature Page - Severance Agreement - Page 1 of 1]

<PAGE>



                                   Schedule A

                     Attached to Severance Agreement between

                      Pioneer Natural Resources Company and
                               Scott D. Sheffield




BASE Salary:

         Effective Date                               Amount

         August 8, 1997                               $600,000
















Dated and Approved as of  8/8/97 :

PIONEER NATURAL RESOURCES                   OFFICER:
COMPANY


By:    /s/ Mark L. Withrow                     /s/ Scott D. Sheffield
   ---------------------------              --------------------------------
Name:    Mark L. Withrow                    Printed Name:
Title:   Executive Vice President                        -------------------



                                       A-1

<PAGE>



                                   Schedule B

                            GENERAL RELEASE AGREEMENT


NOTICE:  Various  state and federal  laws and  regulations  prohibit  employment
discrimination  based on age,  race,  color,  religion,  sex,  national  origin,
disability,  citizenship,  and  membership or  application  for  membership in a
uniformed  service.  These  laws  are  enforced  through  the  Equal  Employment
Opportunity  Commission,  U.S.  Department of Labor,  Texas  Commission on Human
Rights,  and other federal and state  agencies.  You are advised to discuss this
release  with your  attorney.  In any event,  you should  thoroughly  review and
understand the effect of this document before signing it. Therefore, please take
this General Release Agreement home and carefully  consider it for at least five
days before signing it. In accordance with the requirements of the Older Workers
Benefit  Protection  Act, you are allowed at least 45 days from the date of your
receipt of this document and the accompanying explanatory letter to consider the
offer  made to you and to  return  an  executed  copy of this  form to the  Vice
President Administration.  Additionally,  after you have executed this form, you
have seven days to reconsider and revoke your agreement.

GENERAL RELEASE:  In consideration of my acceptance of the payments and benefits
offered to me under  Section  5(d)(2)(c) of the  Severance  Agreement,  I hereby
release and discharge Pioneer Natural Resources Company and its subsidiaries and
affiliates  (the"Company"),  and the  officers,  directors,  employees,  agents,
successors,  and assigns of such entities  (collectively  the"Released Parties")
from any and all claims,  liabilities,  demands,  and causes of action, known or
unknown, fixed or contingent,  which I have or claim against them as a result of
the  termination of my  employment,  including but not limited to claims arising
under  federal,  state,  or local laws  prohibiting  employment  discrimination,
including the Age Discrimination in Employment Act, or claims growing out of any
legal  restrictions,  contractual  or  otherwise,  on  the  Company's  right  to
terminate the employment of its  employees,  and I do hereby agree not to file a
lawsuit to assert such claims. I further acknowledge and agree that by accepting
the  Severance  Agreement  benefits,  I have  given  up my  right  to  file  any
complaint,  lawsuit,  or other legal action against any of the Released  Parties
growing out of,  connected  with, or relating in any way to my employment or the
termination of my employment with the Company.  Further in  consideration of the
payments and benefits offered to me under the Severance Agreement, I acknowledge
and agree that the  Released  Parties  may recover  from me any loss,  including
attorney's  fees and costs of  defending  against any claim  brought by me, that
they may suffer arising out of my breach of this General Release Agreement.

     I understand that this General Release Agreement is final and binding,  and
I  agree  not  to  challenge   its   enforceability.   If  I  do  challenge  the
enforceability of this General Release Agreement, I agree initially to tender to
the Company all money received pursuant to the Severance  Agreement,  and invite
the  Company  to retain  such  money and agree  with me to cancel  this  General
Release  Agreement.  In the event the Company  accepts  this offer,  the Company
shall retain such money and this General Release  Agreement will be void. In the
event the Company  does not accept such offer,  the Company  shall so notify me,
and  shall  place such money in an  interest-bearing  escrow account pending the

                                       B-1

<PAGE>



resolution of any dispute as to whether this General Release  Agreement shall be
set aside and/or otherwise be rendered unenforceable.

     I acknowledge and agree that the Company has no legal obligation to provide
the payment under Section  5(d)(2)(c) of the Severance  Agreement offered to me,
and my  acceptance  of the  obligations  and  attendant  additional  payment  as
described therein constitutes my agreement to all terms and conditions set forth
in this General Release Agreement,  and are in consideration of the promises and
undertakings  of the Company  pursuant  to the  Severance  Agreement.  I further
acknowledge and agree that for unemployment  compensation purposes, the payments
I receive under the Severance Agreement shall be considered  additional wages in
lieu  of  notice;  and  that,  accordingly,  I  may  be  ineligible  to  receive
unemployment compensation benefits for an equivalent period of time.

     This General Release  Agreement does not have any effect on any claim I may
have against the Released Parties  unrelated to the termination of my employment
or with  respect  to any  rights  or claims  that may arise  after the date this
General Release Agreement is executed.

     I have  carefully  read and fully  understand all of the provisions of this
General Release.  I further  acknowledge that entering into this General Release
Agreement is knowing and voluntary on my part, that I have had a reasonable time
to deliberate regarding its terms, and that I have had the right to consult with
an attorney if I so desired.

     I  acknowledge  that I  initially  executed  a General  Release  Agreement,
containing the same terms and conditions as this General Release Agreement, more
than seven days prior to the date appearing below and placed the General Release
Agreement in the mail  addressed to the Company.  I further  acknowledge  that I
have had at least  seven  days  since the date of  execution  of the  originally
executed  General  Release  Agreement  in  which to  reconsider  and  revoke  my
agreement  to the  terms  and  conditions  set  forth  in this  General  Release
Agreement.

Date signed:  -----------------                   -----------------------------
                                                     Signature of Officer

Date signed:  -----------------                   -----------------------------
                                                     Signature of Officer


                                       B-2

<PAGE>


                                   Schedule I




I. Jon Brumley
Timothy L. Dove
Dennis E. Fagerstone
Mel Fischer
Mark L. Withrow
Lon C. Kile
M. Garrett Smith



                                       B-3

<PAGE>




                                                                   EXHIBIT 10.8

                        PIONEER NATURAL RESOURCES COMPANY

                            INDEMNIFICATION AGREEMENT


     This Agreement  ("Agreement") is made and entered into as of the 8th day of
August,  1997 (the "Effective  Date"),  by and between Pioneer Natural Resources
Company,  a  Delaware  corporation  (the  "Company"),  and  Scott  D.  Sheffield
("Indemnitee").

                                    RECITALS

     A. Highly competent and experienced  persons are becoming more reluctant to
serve  corporations  as  directors,  executive  officers or in other  capacities
unless they are provided with adequate protection through insurance and adequate
indemnification  against  inordinate  risks of claims and actions  against  them
arising out of their service to and activities on behalf of the Company.

     B. The Board of Directors of the Company (the "Board") has determined  that
the  inability to attract and retain such persons  would be  detrimental  to the
best interests of the Company and its  stockholders  and that the Company should
act to assure  such  persons  that there  will be  increased  certainty  of such
protection in the future.

     C. The  Board  has  also  determined  that it is  reasonable,  prudent  and
necessary for the Company,  in addition to purchasing and maintaining directors'
and  officers'   liability   insurance  (or  otherwise  providing  for  adequate
arrangements of  self-insurance),  contractually to obligate itself to indemnify
such persons to the fullest extent permitted by applicable law so that they will
serve or continue to serve the Company  free from undue  concern  that they will
not be so indemnified.

     D.  Indemnitee  is  willing  to  serve,  continue  to serve  and to take on
additional  service for or on behalf of the Company on the condition  that he be
so indemnified to the fullest extent permitted by law.

     E. Article Twelfth of the Amended and Restated Certificate of Incorporation
of  the  Company   provides  for   indemnification,   advancement  of  expenses,
arrangements of insurance and  self-insurance  and  specifically  authorizes the
Company to enter into indemnification  agreements that contractually  provide to
indemnitees  the  benefits  of the  provisions  of  Article  Twelfth  and  other
indemnification protections to the fullest extent permitted by law.

     In   consideration  of  the  foregoing  and  the  mutual  covenants  herein
contained,  and other  good and  valuable  consideration,  the  sufficiency  and
receipt of which are hereby acknowledged, the parties hereby agree as follows:



<PAGE>



                                    ARTICLE I

                               Certain Definitions

     As used  herein,  the  following  words and terms shall have the  following
respective meanings (whether singular or plural):

     "Acquiring Person" means any person other than (i) the Company, (ii) any of
the Company's Subsidiaries, (iii) any employee benefit plan of the Company or of
a Subsidiary of the Company or of a Company owned  directly or indirectly by the
stockholders  of the  Company in  substantially  the same  proportions  as their
ownership  of  stock of the  Company,  or (iv) any  trustee  or other  fiduciary
holding  securities  under  an  employee  benefit  plan of the  Company  or of a
Subsidiary  of the Company or of a Company  owned  directly or indirectly by the
stockholders  of the  Company in  substantially  the same  proportions  as their
ownership of stock of the Company.

     "Change in Control" means the occurrence of any of the following events:

     (i) The  acquisition  by any person of  beneficial  ownership  (within  the
meaning  of Rule 13d-3  promulgated  under the  Exchange  Act) of 20% or more of
either  (x) the then  outstanding  shares of Common  Stock of the  Company  (the
"Outstanding Company Common Stock") or (y) the combined voting power of the then
outstanding  voting  securities of the Company entitled to vote generally in the
election of directors (the "Outstanding Company Voting  Securities");  provided,
however, that for purposes of this Subparagraph (i), the following  acquisitions
shall not constitute a Change of Control:  (A) any acquisition directly from the
Company, (B) any acquisition by the Company, (C) any acquisition by any employee
benefit plan (or related  trust)  sponsored or  maintained by the Company or any
corporation  controlled by the Company or (D) any acquisition by any corporation
pursuant to a  transaction  which  complies  with  clauses  (A),  (B) and (C) of
paragraph (iii) below; or

     (ii) Members of the  Incumbent  Board cease for any reason to constitute at
least a majority of the Board; or

     (iii) Consummation of a reorganization,  merger or consolidation or sale or
other disposition of all or substantially all of the assets of the Company or an
acquisition of assets of another corporation (a "Business Combination"), in each
case, unless, following such Business Combination,  (A) all or substantially all
of the individuals and entities who were the beneficial owners, respectively, of
the Outstanding  Company Common Stock and Outstanding  Company Voting Securities
immediately  prior to such Business  Combination  beneficially  own, directly or
indirectly,  more  than 50% of,  respectively,  the then  outstanding  shares of
common  stock  and the  combined  voting  power of the then  outstanding  voting
securities entitled to vote generally in the election of directors,  as the case
may be, of the corporation resulting from such Business Combination  (including,
without limitation, a corporation which as a result of such transaction owns the
Company  or all or substantially all  of the Company's assets either directly or
through one or more subsidiaries) in substantially the same proportions as their
ownership,  immediately  prior to such Business  Combination of the  Outstanding
Company Common Stock and Outstanding Company Voting Securities,  as the case may



<PAGE>



be, (B) no person (excluding any employee benefit plan (or related trust) of the
Company  or  the   corporation   resulting   from  such  Business   Combination)
beneficially owns,  directly or indirectly,  20% or more of,  respectively,  the
then outstanding  shares of common stock of the corporation  resulting from such
Business Combination or the combined voting power of the then outstanding voting
securities of such corporation  except to the extent that such ownership results
solely  from  ownership  of the  Company  that  existed  prior  to the  Business
Combination and (C) at least a majority of the members of the board of directors
of the corporation  resulting from such Business Combination were members of the
Incumbent Board at the time of the execution of the initial agreement, or of the
action of the Board, providing for such Business Combination; or

     (iv) Approval by the stockholders of the Company of a complete  liquidation
or dissolution of the Company.

     "Claim" means an actual or threatened  claim or request for relief which is
or may be made by reason of anything  done or not done by  Indemnitee  in, or by
reason of any event or occurrence related to, Indemnitee's Corporate Status.

     "Corporate  Status"  means the status of a person who is,  becomes or was a
director, officer, employee, agent or fiduciary of the Company or is, becomes or
was  serving at the  request of the  Company as a  director,  officer,  partner,
venturer, proprietor, trustee, employee, agent, fiduciary or similar functionary
of another foreign or domestic  corporation,  partnership,  joint venture,  sole
proprietorship,  trust, employee benefit plan or other enterprise.  For purposes
of this Agreement,  the Company agrees that Indemnitee's service on behalf of or
with  respect  to any  Subsidiary  of the  Company  shall be deemed to be at the
request of the Company.

     "DGCL" means the Delaware General Corporation Law and any successor statute
thereto, as either of them may from time to time be amended.

     "Disinterested  Director"  with  respect to any request by  Indemnitee  for
indemnification  hereunder,  means a director  of the Company who at the time of
the vote is not a named  defendant or respondent in the Proceeding in respect of
which indemnification is sought by Indemnitee.

     "Expenses" means all attorneys' fees,  retainers,  court costs,  transcript
costs,  fees of experts,  witness  fees,  travel  expenses,  duplicating  costs,
printing and binding costs,  telephone charges,  postage,  delivery service fees
and all other disbursements, costs or expenses of the types customarily incurred
in connection with prosecuting,  defending  (including  affirmative defenses and
counterclaims),  preparing  to prosecute  or defend,  investigating  or being or
preparing to be a witness in, or participating in or preparing to participate in
(including on appeal), a Proceeding.

     "Incumbent  Board"  means  the  individuals  who,  as of the  date  of this
Agreement,  constitute the Board and any other individual who becomes a director
of the Company after that date and whose election or appointment by the Board or
nomination for election by the Corporation's stockholders was approved by a vote
of at least a majority of the directors then comprising the Incumbent Board, but
excluding,  for this purpose,  any such individual  whose initial  assumption of
office  occurs  as a result of an actual or  threatened  election  contest  with
respect  to the election or  removal of directors  or other actual or threatened

<PAGE>



solicitation  of proxies or consents by or on behalf of a person  other than the
Incumbent Board.

     "Independent  Counsel" means a law firm, or a member of a law firm, that is
experienced in matters of corporation law and neither  contemporaneously is, nor
in the five years theretofore has been,  retained to represent:  (a) the Company
or  Indemnitee  in any  matter  material  to either  such party  (other  than as
Independent  Counsel under this Agreement or similar  agreements,  (b) any other
party to the Proceeding giving rise to a claim for indemnification  hereunder or
(c) the beneficial owner,  directly or indirectly,  of securities of the Company
representing 40% or more of the combined voting power of the Corporation's  then
outstanding  voting  securities  (other than, in each such case, with respect to
matters  concerning the rights of Indemnitee  under this Agreement,  or of other
indemnitees  under  similar  indemnification  agreements).  Notwithstanding  the
foregoing,  the term  "Independent  Counsel"  shall not  include any person who,
under the applicable  standards of professional  conduct then prevailing,  would
have a conflict of interest in representing  either the Company or Indemnitee in
an action to determine Indemnitee's rights under this Agreement.

     "person"  means any  individual,  entity or group  (within  the  meaning of
Sections 13(d)(3) and 14(d)(2) of the Exchange Act).

     "Potential  Change in Control"  shall be deemed to have occurred if (i) the
Company enters into an agreement,  the consummation of which would result in the
occurrence  of a Change in  Control;  (ii) any person  (including  the  Company)
publicly  announces an intention to take or consider  taking  actions  that,  if
consummated,  would  constitute a Change in Control;  (iii) any Acquiring Person
who is or  becomes  the  beneficial  owner  (within  the  meaning  of Rule 13d-3
promulgated  under the Exchange Act) of  securities of the Company  representing
10% or more of the combined voting power of the then Outstanding  Company Voting
Securities  increases his beneficial  ownership of such securities by 5% or more
over the percentage so owned by the person on the date hereof; or (iv) the Board
adopts a  resolution  to the effect  that,  for  purposes of this  Agreement,  a
Potential Change of Control has occurred.

     "Proceeding"  means any  threatened,  pending or  completed  action,  suit,
arbitration,    investigation,    alternate   dispute   resolution    mechanism,
administrative hearing or any other proceeding  (including,  without limitation,
any securities laws action,  suit,  arbitration,  alternative dispute resolution
mechanism,  hearing  or  procedure)  whether  civil,  criminal,  administrative,
arbitrative or investigative and whether or not based upon events occurring,  or
actions taken,  before the date hereof, and any appeal in or related to any such
action, suit, arbitration,  investigation, hearing or proceeding and any inquiry
or investigation (including discovery),  whether conducted by the Company or any
other party,  that Indemnitee in good faith believes could lead to any appeal in
or  related  to,  any  such  action,  suit,  arbitration,   alternative  dispute
resolution mechanism, hearing or other proceeding.

     "Subsidiary"  means,  with respect to any person,  any corporation or other
entity of which a majority of the voting power of the voting  equity  securities
or equity interest is owned, directly or indirectly, by that person.


<PAGE>



     "Voting  Securities"  means  any  securities  that  vote  generally  in the
election of directors, in the admission of general partners, or in the selection
of any other similar governing body.

                                   ARTICLE II

                             Services by Indemnitee

     Indemnitee is serving as Director,  President & Chief Executive  Officer of
the  Company.  Indemnitee  may from  time to time also  agree to  serve,  as the
Company  may  request  from time to time,  in another  capacity  for the Company
(including  another  officer or director  position)  or as a director,  officer,
partner,  venturer,  proprietor,  trustee, employee, agent, fiduciary or similar
functionary  of another  foreign or  domestic  corporation,  partnership,  joint
venture, sole proprietorship,  trust, employee benefit plan or other enterprise.
Indemnitee  and the Company  each  acknowledge  that they have entered into this
Agreement as a means of inducing  Indemnitee to serve, or continue to serve, the
Company in such capacities. Indemnitee may at any time and for any reason resign
from such position or positions (subject to any other contractual  obligation or
any  obligation  imposed  by  operation  of  law).  The  Company  shall  have no
obligation  under this Agreement to continue  Indemnitee in any such position or
positions.

                                   ARTICLE III

                                 Indemnification

     Section 3.1 General.  Subject to the provisions set forth in Article V, the
Company  shall  indemnify,  and advance  Expenses to,  Indemnitee to the fullest
extent  permitted  by  applicable  law in effect on the date  hereof and to such
greater extent as applicable law may  thereafter  from time to time permit.  The
other  provisions set forth in this Agreement are provided in addition to and as
a means of  furtherance  and  implementation  of, and not in limitation  of, the
obligations  expressed  in this  Article  III. No  requirement,  condition to or
limitation of any right to  indemnification  III, or to  advancement of Expenses
under this Article III,  shall in any way limit the rights of  Indemnitee  under
Section 7.3.

     Section  3.2  Additional  Indemnity  of the  Company.  Indemnitee  shall be
entitled  to  indemnification  pursuant  to this  Section  3.2 if,  by reason of
anything  done or not  done by  Indemnitee  in,  or by  reason  of any  event or
occurrence  related to,  Indemnitee's  Corporate  Status,  Indemnitee is, was or
becomes,  or is  threatened  to be  made,  a  party  to,  or  witness  or  other
participant in any Proceeding. Pursuant to this Section 3.2, Indemnitee shall be
indemnified against any and all Expenses, judgments, penalties (including excise
or similar taxes), fines and amounts paid in settlement (including all interest,
assessments  and other charges paid or payable in connection  with or in respect
of  any  such  Expenses,  judgments,   penalties,  fines  and  amounts  paid  in
settlement)  actually  and  reasonably  incurred  by  him or on  his  behalf  in
connection  with  such  Proceeding  or  any  Claim,  issue  or  matter  therein.
Notwithstanding the foregoing, the obligations of the Company under this Section
3.2 shall be subject to the condition that no determination  (which, in any case
in  which Independent  Counsel is  involved,  shall  be in  a form of  a written


<PAGE>



opinion) shall have been made pursuant to Article V that Indemnitee would not be
permitted to be indemnified  under  applicable law.  Nothing in this Section 3.2
shall limit the benefits of Section 3.1 or any other Section hereunder.

     Section 3.3  Advancement of Expenses.  The Company shall pay all reasonable
Expenses  incurred by or on behalf of Indemnitee  (or, if applicable,  reimburse
Indemnitee  for any and all  Expenses  reasonable  incurred  by  Indemnitee  and
previously  paid by  Indemnitee)  in  connection  with any Claim or  Proceeding,
whether  brought by the Company or  otherwise,  in advance of any  determination
respecting  entitlement to indemnification  pursuant to Article IV hereof within
10  days  after  the  receipt  by the  Company  of (a) a  written  request  from
Indemnitee  requesting such payment or payments from time to time, whether prior
to or after final disposition of such Proceeding,  and (b) a written affirmation
from Indemnitee of his good faith belief that he has met the standard of conduct
necessary for Indemnitee to be permitted to be indemnified under applicable law.
Such statement or statements shall reasonably  evidence the Expenses incurred by
Indemnitee.  Any such payment by the Company is referred to in this Agreement as
an "Expense Advance." In connection with any request for an Expense Advance,  if
requested by the Company,  Indemnitee or Indemnitee's  counsel shall also submit
an affidavit stating that the Expenses incurred were reasonable.  Any dispute as
to the  reasonableness  of any Expense shall not delay an Expense Advance by the
Company,  and the Company  agrees that any such dispute  shall be resolved  only
upon  the  disposition  or  conclusion  of  the  underlying  Claim  against  the
Indemnitee. Indemnitee hereby undertakes and agrees (which agreement shall be an
unsecured obligation of Indemnitee) that he will reimburse and repay the Company
without interest for any Expenses Advance to the extent that it shall ultimately
be determined (in a final adjudication by a court from which there is no further
right of appeal or in a final adjudication of an arbitration pursuant to Section
5.1 if  Indemnitee  elects  to seek such  arbitration)  that  Indemnitee  is not
entitled to be indemnified by the Company against such Expenses.

     Section 3.4  Indemnification  for  Additional  Expenses.  The Company shall
indemnity   Indemnitee  against  any  and  all  costs  and  expenses  (including
attorneys' and expert  witnesses' fees) and,  if requested by Indemnitee,  shall
(within two business days of that  request)  advance those costs and expenses to
Indemnitee,  that are  incurred  by  Indemnitee  in  connection  with any  claim
asserted against or action brought by Indemnitee for (i)  indemnification  or an
Expense  Advance by the Company under this  Agreement or any other  agreement or
provision of the  Corporation's  Certificate of  Incorporation or  Bylaws now or
hereafter in effect relating to any Claim or Proceeding,  or (ii) recovery under
any  directors' and officers'  liability  insurance  policies  maintained by the
Company,  regardless  of  whether  Indemnitee  ultimately  is  determined  to be
entitled  to  that  indemnification,   advance  expense  payment,  or  insurance
recovery, as the case may be.

     Section  3.5  Partial  Indemnity.  If  Indemnitee  is  entitled  under  any
provision  of this  Agreement  to  indemnification  by the Company for some or a
portion of the  Expenses,  judgments,  fines,  penalties,  and  amounts  paid in
settlement  of a Claim or  Proceeding  but not,  however,  for all of the  total
amount  thereof,  the Company shall  nevertheless  indemnify  Indemnitee for the
portion thereof to which Indemnitee is entitled.  Moreover,  notwithstanding any
other  provision  of this  Agreement,  to the extent  that  Indemnitee  has been
successful  on the  merits  or  otherwise  in  defense  of any or all  Claims or
Proceedings,  or in defense of any issue or matter therein,  including dismissal

<PAGE>



without prejudice, Indemnitee shall be indemnified against all Expenses incurred
in connection therewith.

                                   ARTICLE IV

                   Procedure for Determination of Entitlement
                               to Indemnification

     Section 4.1 Request by  Indemnitee.  To obtain  indemnification  under this
Agreement,  Indemnitee shall submit to the Company a written request,  including
therein  or  therewith  such  documentation  and  information  as is  reasonably
available to Indemnitee and is reasonably  necessary to determine whether and to
what extent  Indemnitee  is entitled to  indemnification.  The  Secretary  or an
Assistant  Secretary  of the  Company  shall,  promptly  upon  receipt of such a
request for  indemnification,  advise the Board in writing that  Indemnitee  has
requested indemnification.

     Section 4.2  Determination  of Request.  Upon written request by Indemnitee
for  indemnification  pursuant to the first  sentence  of Section 4.1 hereof,  a
determination, if required by applicable law, with respect to whether Indemnitee
is permitted under applicable law to be indemnified  shall be made in accordance
with the terms of Section 4.5(b), in the specific case as follows:

(a)  If a  Potential  Change  in  Control  or a Change  in  Control  shall  have
     occurred,  by Independent Counsel (selected in accordance with Section 4.3)
     in a written opinion to the Board and Indemnitee,  unless  Indemnitee shall
     request that such determination be made by the Board, or a committee of the
     Board, in which case by the person or persons or in the manner provided for
     in clause (i) or (ii) of paragraph (b) below; or

(b)  If a  Potential  Change in Control  or a Change in  Control  shall not have
     occurred,  (i) by the  Board by a  majority  vote of a quorum  of the Board
     consisting   of   Disinterested   Directors,   or  (ii)  if  there  are  no
     Disinterested  Directors,  or  if a  quorum  of  the  Board  consisting  of
     Disinterested  Directors  is  not  obtainable,  by  a  majority  vote  of a
     committee of the Board  designated  to act in the matter by a majority vote
     of the  entire  Board,  consisting  solely  of two  or  more  Disinterested
     Directors,  or (iii) by  Independent  Counsel  selected  by the  Board or a
     committee  of the  Board by a vote as set forth in  clauses  (i) or (ii) of
     this paragraph (b), or if such quorum is not obtainable or such a committee
     cannot be  established,  by a majority  vote of all  directors,  or (iv) if
     Indemnitee and the Company agree,  by the  stockholders of the Company in a
     vote that excludes the shares held by directors  who are not  Disinterested
     Directors.

If it is so  determined  that  Indemnitee is permitted to be  indemnified  under
applicable  law,  payment to Indemnitee  shall be made within 10 days after such
determination.  Nothing  contained  in this  Agreement  shall  require  that any
determination  be made  under  this  Section  4.2  prior to the  disposition  or
conclusion of a Claim or Proceeding against the Indemnitee;  provided,  however,
that Expense  Advances shall continue to be made by the Company pursuant to, and
to the  extent required by,  the provisions  of Article  III.   Indemnitee shall


<PAGE>



cooperate with the person or persons making such  determination  with respect to
Indemnitee's entitlement to indemnification,  including providing to such person
upon reasonable  advance request any  documentation  or information  that is not
privileged  or  otherwise  protected  from  disclosure  and  that is  reasonably
available to Indemnitee  and  reasonably  necessary to such  determination.  Any
costs  or expenses  (including  attorneys' fees and  disbursements)  incurred by
Indemnitee  in  so   cooperating   with  the  person  or  persons   making  such
determination  shall be borne by the Company  (irrespective of the determination
as to  Indemnitee's  entitlement  to  indemnification)  and  the  Company  shall
indemnify and hold harmless Indemnitee therefrom.

     Section 4.3  Independent  Counsel.  If a  Potential  Change in Control or a
Change in Control shall not have occurred and the  determination  of entitlement
to indemnification is to be made by Independent Counsel, the Independent Counsel
shall be selected by (a) a majority vote of the  Disinterested  Directors,  even
though  less than a quorum  of the  Board or (b) if there  are no  Disinterested
Directors,  by a majority vote of the Board,  and the Company shall give written
notice  to  Indemnitee,   within  10  days  after  receipt  by  the  Company  of
Indemnitee's request for indemnification, specifying the identity and address of
the  Independent  Counsel so  selected.  If a  Potential  Change in Control or a
Change in Control shall have occurred and the  determination  of  entitlement to
indemnification is to be made by Independent  Counsel,  the Independent  Counsel
shall be selected by Indemnitee, and Indemnitee shall give written notice to the
Company,   within  10  days  after   submission  of  Indemnitee's   request  for
indemnification,  specifying the identity and address of the Independent Counsel
so selected (unless  Indemnitee shall request that such selection be made by the
Disinterested  Directors or a committee of the Board, in which event the Company
shall  give  written  notice to  Indemnitee  within  10 days  after  receipt  of
Indemnitee's request for the Board or a committee of the Disinterested Directors
to make such  selection,  specifying the identity and address of the Independent
Counsel so  selected).  In either  event,  (i) such notice to  Indemnitee or the
Company,  as the case may be, shall be accompanied  by a written  affirmation of
the  Independent  Counsel so selected that it satisfies the  requirements of the
definition of "Independent  Counsel" in Article I and that it agrees to serve in
such  capacity  and (ii)  Indemnitee  or the  Company,  as the case may be, may,
within seven days after such written notice of selection  shall have been given,
deliver to the Company or to Indemnitee, as the case may be, a written objection
to such selection. Any objection to selection of Independent Counsel pursuant to
this Section 4.3 may be asserted only on the ground that the Independent Counsel
so selected does not meet the  requirements  of the  definition of  "Independent
Counsel" in Article I, and the objection shall set forth with  particularity the
factual basis of such assertion.  If such written  objection is timely made, the
Independent  Counsel so selected may not serve as Independent Counsel unless and
until a court of competent  jurisdiction  (the "Court") has determined that such
objection  is without  merit.  In the event of a timely  written  objection to a
choice of Independent  Counsel,  the party originally  selecting the Independent
Counsel  shall have seven days to make an  alternate  selection  of  Independent
Counsel and to give written notice of such  selection to the other party,  after
which time such other party shall have five days to make a written  objection to
such alternate selection.  If, within 30 days after submission of Indemnitee's s
request for  indemnification  pursuant to Section  4.1, no  Independent  Counsel
shall have been  selected and not objected to,  either the Company or Indemnitee
may petition the Court for resolution of any objection that shall have been made
by the  Company or  Indemnitee to  the other's selection  of Independent Counsel

<PAGE>



and/or for the  appointment as Independent  Counsel of a person  selected by the
Court or by such other person as the Court shall designate,  and the person with
respect to whom an objection is so resolved or the person so appointed shall act
as  Independent  Counsel  under  Section 4.2. The Company  shall pay any and all
reasonable fees and expenses incurred by such Independent  Counsel in connection
with acting  pursuant to Section 4.2, and the Company  shall pay all  reasonable
fees and expenses incident to the procedures of this Section 4.3,  regardless of
the manner in which such Independent Counsel was selected or appointed. Upon the
due commencement of any judicial  proceeding or arbitration  pursuant to Section
5.1,  Independent  Counsel  shall be  discharged  and  relieved  of any  further
responsibility  in  such  capacity  (subject  to  the  applicable  standards  of
professional conduct then prevailing).

     Section 4.4 Establishment of a Trust. In the event of a Potential Change in
Control or a Change in Control,  the Company shall,  upon written request by the
Indemnitee,  create a trust for the benefit of the Indemnitee  (the "Trust") and
from time to time upon written request of the Indemnitee shall fund the Trust in
an amount sufficient to satisfy any and all Expenses  reasonably  anticipated at
the time of each such request to be incurred in connection  with  investigating,
preparing  for,  and  defending  any Claim,  and any and all  judgments,  fines,
penalties,  and  settlement  amounts  of any and all  Claims  from  time to time
actually paid or claimed,  reasonably  anticipated,  or proposed to be paid. The
amount to be deposited in the Trust pursuant to the foregoing funding obligation
shall be determined by the Independent  Counsel (or other  person(s)  making the
determination of whether Indemnitee is permitted to be indemnified by applicable
law). The terms of the Trust shall provide that,  upon a Change in Control,  (i)
the Trust shall not be revoked or the  principal  thereof  invaded,  without the
written consent of the Indemnitee;  (ii) the trustee of the Trust shall advance,
within ten  business  days of a request by  Indemnitee,  any and all  reasonable
Expenses to Indemnitee, any required determination concerning the reasonableness
of the Expenses to be made by the  Independent  Counsel (and  Indemnitee  hereby
agrees to reimburse the Trust under the  circumstances in which Indemnitee would
be required to reimburse the Company for Expenses  Advances under Section 3.3 of
this  Agreement);  (iii) the Trust shall continue to be funded by the Company in
accordance with the funding  obligation set forth above; (iv) the trustee of the
Trust shall promptly pay to Indemnitee all amounts for which Indemnitee shall be
entitled to indemnification  pursuant to this Agreement;  and (v) all unexpended
funds in the Trust shall revert to the Company upon a final determination by the
Independent  Counsel or a court of competent  jurisdiction,  as the case may be,
that  Indemnitee has been fully  indemnified  under the terms of this Agreement.
The  trustee  of the  Trust  shall  be  chosen  by  Indemnitee  and  shall be an
institution that is not affiliated with the Indemnitee.  Nothing in this Section
4.4 shall relieve the Company of any of its obligations under this Agreement.

     Section 4.5  Presumptions and Effect of Certain Proceedings.

     i.   The  Indemnitee  shall be presumed  to be entitled to  indemnification
          under this Agreement upon submission of a request for  indemnification
          under  Section 4.1, and the Company  shall have the burden of proof in
          overcoming that  presumption in reaching a  determination  contrary to
          that  presumption.  Such  presumption  shall  be used  by  Independent
          Counsel  (or  other  person  or  persons  determining  entitlement  to

<PAGE>



          indemnification)  as a basis  for  a determination  of  entitlement to
          indemnification unless  the Company provides information sufficient to
          overcome such  presumption by clear and  convincing evidence or unless
          the investigation, review and analysis of Independent Counsel (or such
          other  person  or  persons)  convinces  him  by  clear and  convincing
          evidence that the presumption should not apply.

     ii.  If the person or persons  empowered  or selected  under  Article IV of
          this  Agreement  to  determine  whether   Indemnitee  is  entitled  to
          indemnification  shall  not have made a  determination  within 60 days
          after  receipt by the Company of the request by  Indemnitee  therefor,
          the requisite determination of entitlement to indemnification shall be
          deemed to have  been made and  Indemnitee  shall be  entitled  to such
          indemnification,  absent (i) a knowing misstatement by Indemnitee of a
          material  fact, or knowing  omission of a material  fact  necessary to
          make Indemnitee's  statement not materially misleading,  in connection
          with the request for  indemnification,  or (ii) a prohibition  of such
          indemnification  under applicable law;  provided,  however,  that such
          60-day period may be extended for a reasonable  time, not to exceed an
          additional  30 days,  if the  person  making  the  determination  with
          respect to entitlement to  indemnification in good faith requires such
          additional  time for the  obtaining  or  evaluating  of  documentation
          and/or  information  relating  to such  determination;  and  provided,
          further,  that the 60-day  limitation set forth in this Section 4.5(b)
          shall not apply and such period shall be extended as necessary  (i) if
          within  30 days  after  receipt  by the  Company  of the  request  for
          indemnification  under  Section 4.1  Indemnitee  and the Company  have
          agreed, and the Board has resolved to submit such determination to the
          stockholders  of the  Company  pursuant  to  Section  4.2(b) for their
          consideration  at an annual meeting of  stockholders to be held within
          90 days after such agreement and such  determination  is made thereat,
          or a special  meeting of  stockholders  is called within 30 days after
          such  receipt  for the  purpose  of making  such  determination,  such
          meeting is held for such  purpose  within 60 days after having been so
          called  and  such  determination  is  made  thereat,  or  (ii)  if the
          determination  of  entitlement  to  indemnification  is to be  made by
          Independent  Counsel pursuant to Section 4.2(a) of this Agreement,  in
          which  case the  applicable  period  shall be as set forth in  Section
          5.1(c).

     iii. The termination of any Proceeding or of any Claim,  issue or matter by
          judgment,  order,  settlement (whether with or without court approval)
          or conviction,  or upon a plea of nolo  contendere or its  equivalent,
          shall not (except as otherwise  expressly  provided in this Agreement)
          by itself adversely affect the rights of Indemnitee to indemnification
          or create a presumption  that Indemnitee meet any particular  standard
          of  conduct  or  have  any  particular  belief  or  that a  court  has
          determined  that  indemnification  is not permitted by applicable law.
          Indemnitee shall be deemed to have been found liable in respect of any


<PAGE>



          Claim, issue or matter only after he shall  have  been so  adjudged by
          the Court after exhaustion of all appeals therefrom.


                                    ARTICLE V

                         Certain Remedies of Indemnitee

     Section 5.1 Indemnitee Entitled to Adjudication in an Appropriate Court. If
(a) a  determination  is made  pursuant  to  Article IV that  Indemnitee  is not
entitled to indemnification under this Agreement; (b) there has been any failure
by the  Company  to make  timely  payment  or  advancement  of any  amounts  due
hereunder;  or (c) the determination of entitlement to  indemnification is to be
made by Independent Counsel pursuant to Section 4.2 and such determination shall
not have been made and delivered in a written  opinion  within 90 days after the
latest of (i) such Independent Counsel's being appointed, (ii) the overruling by
the Court of objections to such counsel's  selection or (iii)  expiration of all
periods for the Company or  Indemnitee  to object to such  counsel's  selection,
Indemnitee  shall be entitled to commence an action seeking an  adjudication  in
the Court of his entitlement to such indemnification or advancement of Expenses.
Alternatively, Indemnitee, at his option, may seek an award in arbitration to be
conducted by a single arbitrator pursuant to the commercial arbitration rules of
the American  Arbitration  Association.  Indemnitee  shall  commence such action
seeking an adjudication or an award in arbitration within 180 days following the
date on which Indemnitee first has the right to commence such action pursuant to
this Section 5.1, or such right shall expire.  The Company  agrees not to oppose
Indemnitee's right to seek any such adjudication or award in arbitration.

     Section 5.2 Adverse Determination Not to Affect any Judicial Proceeding. If
a  determination  shall have been made pursuant to Article IV that Indemnitee is
not entitled to indemnification under this Agreement, any judicial proceeding or
arbitration  commenced  pursuant  to this  Article V shall be  conducted  in all
respects as a de novo trial or arbitration on the merits,  and Indemnitee  shall
not be  prejudiced  by  reason of such  initial  adverse  determination.  In any
judicial  proceeding  or  arbitration  commenced  pursuant  to this  Article  V,
Indemnitee shall be presumed to be entitled to indemnification or advancement of
Expenses,  as the case may be, under this  Agreement  and the Company shall have
the  burden of proof in  overcoming  such  presumption  and to show by clear and
convincing  evidence  that  Indemnitee  is not  entitled to  indemnification  or
advancement of Expenses, as the case may be.

     Section 5.3 Company Bound by  Determination  Favorable to Indemnitee in any
Judicial  Proceeding or Arbitration.  If a determination shall have been made or
deemed to have been made  pursuant to Article IV that  Indemnitee is entitled to
indemnification, the Company shall be irrevocably bound by such determination in
any judicial proceeding or arbitration commenced pursuant to this Article V, and
shall be precluded from asserting that such  determination  has not been made or
that the procedure by which such  determination  was made is not valid,  binding
and  enforceable,  in each  such  case  absent  (a) a  knowing  misstatement  by
Indemnitee  of a  material  fact,  or a  knowing  omission  of a  material  fact
necessary to  make a  statement by  Indemnitee  not  materially  misleading,  in

<PAGE>



connection  with the request for  indemnification  or (b) a prohibition  of such
indemnification under applicable law.

     Section 5.3 Company Bound by the Agreement.  The Company shall be precluded
from asserting in any judicial  proceeding or arbitration  commenced pursuant to
this Article V that the  procedures and  presumptions  of this Agreement are not
valid,  binding and  enforceable and shall stipulate in any such court or before
any such  arbitrator  that the  Company is bound by all the  provisions  of this
Agreement.

     Section 5.4  Indemnitee  Entitled to  Expenses of Judicial  Proceeding.  If
Indemnitee  seeks a  judicial  adjudication  of or an  award in  arbitration  to
enforce his rights under,  or to recover  damages for breach of, this Agreement,
Indemnitee shall be entitled to recover from the Company,  and the Company shall
indemnify  Indemnitee  against,  any and all expenses (of the types described in
the definition of Expenses in Article I) actually and reasonably incurred by him
in such judicial  adjudication  or arbitration  but only if Indemnitee  prevails
therein. If it shall be determined in such judicial  adjudication or arbitration
that  Indemnitee is entitled to receive part but not all of the  indemnification
or advancement  of expenses or other benefit  sought,  the expenses  incurred by
Indemnitee in connection with such judicial adjudication or arbitration shall be
equitably  allocated  between the Company and  Indemnitee.  Notwithstanding  the
foregoing,  if a Change in Control  shall  have  occurred,  Indemnitee  shall be
entitled  to  indemnification  under  this  Section  5.5  regardless  of whether
Indemnitee ultimately prevails in such judicial adjudication or arbitration.


                                   ARTICLE VI

                                  Contribution

     Section  6.1  Contribution  Payment.  To  the  extent  the  indemnification
provided for under any provision of this  Agreement is determined (in the manner
hereinabove  provided)  not to be permitted  under  applicable  law, then in the
event Indemnitee was, is, or becomes a party to or witness or other  participant
in, or is threatened to be made a party to or witness or other participant in, a
Proceeding  by  reason of (or  arising  in part out of)  Indemnitee's  Corporate
Status, the Company, in lieu of indemnifying Indemnitee, shall contribute to the
amount of any and all Expenses,  judgments, fines, or penalties assessed against
or incurred or paid by Indemnitee on account of such  Proceeding and any and all
amounts  paid  in  settlement  of  that  Proceeding   (including  all  interest,
assessments,  and other charges paid or payable in connection with or in respect
of such Expenses,  judgments,  fines,  penalties, or amounts paid in settlement)
for which such  indemnification is not permitted  ("Contribution  Amounts"),  in
such  proportion as is appropriate to reflect the relative fault with respect to
the subject matter of the Proceeding giving rise to the Contribution  Amounts of
Indemnitee,  on the one hand,  and of the Company and any and all other  parties
(including  officers and directors of the Company other than Indemnitee) who may
be at fault with respect to such matter  (collectively,  including  the Company,
the "Third Parties") on the other hand.



<PAGE>



     Section 6.2 Relative Fault. The relative fault of the Third Parties and the
Indemnitee  shall  be  determined  (i) by  reference  to the  relative  fault of
Indemnitee as determined by the court or other governmental agency assessing the
Contribution  Amounts  or (ii) to the extent  such  court or other  governmental
agency does not apportion  relative fault,  by the Independent  Counsel (or such
other party which makes a determination under Article IV after giving effect to,
among other things, the relative intent, knowledge,  access to information,  and
opportunity  to prevent or correct the  subject  matter of the  Proceedings  and
other  relevant  equitable   considerations  of  each  party.  The  Company  and
Indemnitee  agree  that it  would  not be just  and  equitable  if  contribution
pursuant to this Section 6.2 were  determined  by pro rata  allocation or by any
other  method  of   allocation   which  does  take  account  of  the   equitable
considerations referred to in this Section 6.2.


                                   ARTICLE VII

                                  Miscellaneous

     Section  7.1   Non-Exclusivity.   The  rights  of   Indemnitee  to  receive
indemnification  and  advancement of Expenses  under this Agreement  shall be in
addition to, and shall not be deemed  exclusive of, any other rights  Indemnitee
shall have under the DGCL or other  applicable law, the charter or bylaws of the
Company, any other agreement, vote of stockholders or a resolution of directors,
or otherwise. No amendment or alteration of the charter or bylaws of the Company
or any provision  thereof shall adversely affect  Indemnitee's  rights hereunder
and such rights shall be in addition to any rights Indemnitee may have under the
charter,  Bylaws and the DGCL or other  applicable law. To the extent that there
is a change in the DGCL or other  applicable law (whether by statute or judicial
decision)  that  allows  greater  indemnification  by  agreement  than  would be
afforded currently under the Corporation's charter or bylaws and this Agreement,
it is the intent of the parties hereto that the Indemnitee shall enjoy by virtue
of this Agreement the greater benefit so afforded by such change.

     Section 7.2   Insurance and Subrogation.

(a)  To the extent that the Company  maintains an  insurance  policy or policies
     providing liability insurance for directors, officers, employees, agents or
     fiduciaries of the Company or for individuals serving at the request of the
     Company as directors, officers, partners, venturers, proprietors, trustees,
     employees,  agents, fiduciaries or similar functionaries of another foreign
     or domestic corporation,  partnership,  joint venture, sole proprietorship,
     trust,  employee  benefit  plan or other  enterprise,  Indemnitee  shall be
     covered by such policy or policies in accordance with its or their terms to
     the  maximum  extent  of the  coverage  available  for any  such  director,
     officer, employee, agent or fiduciary under such policy or policies.

(b)  In the event of any  payment  by the  Company  under  this  Agreement,  the
     Company  shall be  subrogated  to the extent of such  payment to all of the
     rights of recovery of Indemnitee, who shall execute all papers required and
     take all action  necessary  to secure such rights,  including  execution of
     such  documents  as are  necessary  to enable the  Company to bring suit to
     enforce such rights.


<PAGE>



(c)  The Company shall not be liable under this Agreement to make any payment of
     amounts  otherwise  indemnifiable  hereunder  if  and to  the  extent  that
     Indemnitee  has  otherwise   actually   received  such  payment  under  the
     Corporation's  charter  or  bylaws  or  any  insurance  policy,   contract,
     agreement or otherwise.

     Section 7.3 Self Insurance of the Company; Other Arrangements.  The parties
hereto  recognize  that the Company  may,  but is not  required  to,  procure or
maintain  insurance or other similar  arrangements,  at its expense,  to protect
itself and any  person,  including  the  Indemnitee,  who is or was a  director,
officer, employee, agent or fiduciary of the Company or who is or was serving at
the  request  of  the  Company  as  a  director,   officer,  partner,  venturer,
proprietor,  trustee,  employee,  agent,  fiduciary  or similar  functionary  of
another  foreign or  domestic  corporation,  partnership,  joint  venture,  sole
proprietorship,  trust,  employee benefit plan or other  enterprise  against any
expense,  liability or loss asserted against or incurred by such person, in such
a  capacity  or arising  out of his status as such a person,  whether or not the
Company  would have the power to indemnify  such person  against such expense or
liability or loss.

     In considering the cost and  availability  of such  insurance,  the Company
(through the exercise of the business  judgment of its  directors  and officers)
may,  from time to time,  purchase  insurance  which  provides  for  certain (i)
deductibles, (ii) limits on payments required to be made by the insurer or (iii)
coverage  which  may not be as  comprehensive  as that  previously  included  in
insurance  purchased  by  the  Company  or its  predecessors.  The  purchase  of
insurance with deductibles,  limits on payments and coverage exclusions, even if
in the best  interest  of the  Company,  may not be in the best  interest of the
Indemnitee. As to the Company, purchasing insurance with deductibles,  limits on
payments and coverage  exclusions  is similar to the  Corporation's  practice of
self-insurance  in other  areas.  In  order  to  protect  Indemnitee  who  would
otherwise be more fully or entirely  covered  under such  policies,  the Company
shall,  to the maximum extent  permitted by applicable  law,  indemnify and hold
Indemnitee  harmless  to the  extent  (i) of such  deductibles,  (ii) of amounts
exceeding  payments  required  to be made by an  insurer  or  (iii)  that  prior
policies of officer's and director's  liability insurance held by the Company or
its predecessors would have provided for payment to Indemnitee,  if by reason of
his  Corporate  Status  he  is or is  threatened  to be  made  a  party  to  any
Proceeding.  The  obligation of the Company in the preceding  sentence  shall be
without  regard to whether the Company would  otherwise be required to indemnify
such officer or director under the other provisions of this Agreement,  or under
any law,  agreement,  vote of  stockholders  or directors or other  arrangement.
Without  limiting  the  generality  of any  provision  of  this  Agreement,  the
procedures in Article IV hereof  shall,  to the extent  applicable,  be used for
determining entitlement to indemnification under this Section 7.3.

     Section  7.4  Certain  Settlement  Provisions.  The  Company  shall have no
obligation  to indemnify  Indemnitee  under this  Agreement  for amounts paid in
settlement  of a Proceeding  or Claim  without the  Corporation's  prior written
consent. The Company shall not settle any Proceeding or Claim in any manner that
would impose any fine or other  obligation  on Indemnitee  without  Indemnitee's
prior written  consent.  Neither the Company nor Indemnitee  shall  unreasonably
withhold their consent to any proposed settlement.


<PAGE>




     Section 7.5 Exculpation of Directors. If Indemnitee is or was a director of
the  Company,  he shall not in that  capacity  be liable to the  Company  or its
stockholders  for  monetary  damages  for  an act or  omission  in  Indemnitee's
capacity  as a  director,  except  that  Indemnitee's  liability  shall  not  be
eliminated or limited for: (a) any breach of Indemnitee's duty of loyalty to the
Company  or its  stockholders;  (b) any acts or  omissions  not in good faith or
which involve  intentional  misconduct or a knowing  violation of the law; (c) a
transaction from which Indemnitee  received an improper benefit,  whether or not
the  benefit  resulted  from an action  taken  within the scope of  Indemnitee's
office;  or (d) an act or omission  for which the  liability  of  Indemnitee  is
expressly provided for by statute.

     Section 7.6 Duration of Agreement.  This  Agreement  shall  continue for so
long as Indemnitee serves as a director,  officer,  employee, agent or fiduciary
of the  Company  or, at the  request of the  Company,  as a  director,  officer,
partner,  venturer,  proprietor,  trustee, employee, agent, fiduciary or similar
functionary  of another  foreign or  domestic  corporation,  partnership,  joint
venture, sole proprietorship,  trust, employee benefit plan or other enterprise,
and thereafter shall survive until and terminate upon the later to occur of: (a)
the  expiration  of 20 years  after the latest date that  Indemnitee  shall have
ceased to serve in any such capacity;  (b) the final  termination of all pending
Proceedings in respect of which Indemnitee is granted rights of  indemnification
or  advancement  of  Expenses  hereunder  and of  any  proceeding  commenced  by
Indemnitee pursuant to Article IV relating thereto; or (c) the expiration of all
statutes of limitation applicable to possible Claims arising out of Indemnitee's
Corporate Status.

     Section  7.7 Notice by Each Party.  Indemnitee  shall  promptly  notify the
Company in writing  upon being  served  with any  summons,  citation,  subpoena,
complaint,  indictment,  information or other document or communication relating
to  any   Proceeding  or  Claim  for  which   Indemnitee   may  be  entitled  to
indemnification or advancement of Expenses hereunder;  provided,  however,  that
any failure of Indemnitee  to so notify the Company  shall not adversely  affect
Indemnitee's  rights under this Agreement except to the extent the Company shall
have been materially  prejudiced as a direct result of such failure. The Company
shall promptly notify Indemnitee in writing as to the pendency of any Proceeding
or Claim that may involve a claim against the  Indemnitee  for which  Indemnitee
may be entitled to indemnification or advancement of Expenses hereunder.

     Section 7.8 Amendment. This Agreement may not be modified or amended except
by a written instrument executed by or on behalf of each of the parties hereto.

     Section 7.9 Waivers.  The  observance of any term of this  Agreement may be
waived (either generally or in a particular instance and either retroactively or
prospectively)  by the party  entitled  to  enforce  such term only by a writing
signed  by the  party  against  which  such  waiver  is to be  asserted.  Unless
otherwise expressly provided herein, no delay on the part of any party hereto in
exercising  any right,  power or privilege  hereunder  shall operate as a waiver
thereof,  nor shall any  waiver  on the part of any party  hereto of any  right,
power or privilege  hereunder  operate as a waiver of any other right,  power or
privilege hereunder nor shall any single or partial exercise of any right, power

<PAGE>



or privilege  hereunder  preclude any other or further  exercise  thereof or the
exercise of any other right, power or privilege hereunder.

     Section 7.10 Entire Agreement.  This Agreement and the documents  expressly
referred to herein  constitute the entire  agreement  between the parties hereto
with  respect  to  the  matters   covered   hereby,   and  any  other  prior  or
contemporaneous oral or written understandings or agreements with respect to the
matters covered hereby are expressly superseded by this Agreement.

     Section 7.11  Severability.  If any provision of this Agreement  (including
any provision within a single section, paragraph or sentence) or the application
of such provision to any person or circumstance, shall be judicially declared to
be invalid,  unenforceable  or void,  such  decision will not have the effect of
invalidating   or  voiding  the  remainder  of  this  Agreement  or  affect  the
application  of such provision to other persons or  circumstances,  it being the
intent and agreement of the parties that this Agreement  shall be deemed amended
by modifying  such provision to the extent  necessary to render it valid,  legal
and  enforceable  while  preserving its intent,  or if such  modification is not
possible,  by substituting  therefor another provision that is valid,  legal and
unenforceable  and  that  achieves  the same  objective.  Any  such  finding  of
invalidity  or  unenforceability  shall  not  prevent  the  enforcement  of such
provision  in  any  other  jurisdiction  to  the  maximum  extent  permitted  by
applicable law.

     Section 7.12 Notices. All notices and other communications  hereunder shall
be in writing and shall be deemed given upon (a) transmitter's confirmation of a
receipt  of a  facsimile  transmission,  (b)  confirmed  delivery  of a standard
overnight  courier  or when  delivered  by hand  or (c) the  expiration  of five
business  days after the date mailed by  certified  or  registered  mail (return
receipt  requested),  postage prepaid, to the parties at the following addresses
(or at such other addresses for a party as shall be specified by like notice):

                  If to the Company, to it at:

                           Pioneer Natural Resources Company
                           1400 Williams Square West
                           5205 North O'Connor Blvd.
                           Irving, Texas  75039-3746

                           Attn: Chief Financial Officer

                  If to Indemnitee, to him at:

                           Scott D. Sheffield
                           Pioneer Natural Resources Company
                           1400 Williams Square West
                           5205 N. O'Connor Blvd.
                           Irving, Texas 75039



<PAGE>



or to such other  address or to such other  individuals  as any party shall have
last  designated  by  notice  to  the  other  parties.  All  notices  and  other
communications  given to any party in  accordance  with the  provisions  of this
Agreement  shall be deemed  to have been  given  when  delivered  or sent to the
intended  recipient  thereof in accordance  with the  provisions of this Section
7.12.

     Section 7.13 Governing Law. This Agreement shall be construed in accordance
with and  governed  by the laws of the State of Delaware  without  regard to the
principles of conflict of laws.



<PAGE>



     Section 7.14  Certain Construction Rules.

(a)  The  article and  section  headings  contained  in this  Agreement  are for
     reference  purposes  only and shall not  affect in any way the  meaning  or
     interpretation  of  this  Agreement.  As used  in  this  Agreement,  unless
     otherwise provided to the contrary,
                (1)  all  references  to  days  shall  be deemed  references  to
                     calendar days and any reference to a "Section" or "Article"
                     shall be  deemed to refer to a section or  article of  this
                     Agreement. The words "hereof," "herein" and "hereunder" and
                     words of similar import  referring to  this Agreement refer
                     to  this  Agreement as a whole  and  not to any  particular
                     provision of this Agreement.  Whenever the words "include,"
                     "includes" or "including"  are used in this Agreement, they
                     shall  be  deemed  to  be followed  by  the words  "without
                     limitation."  Unless  otherwise  specifically  provided for
                     herein,  the term "or" shall not be deemed to be exclusive.
                     Whenever the context may require,  any pronoun used in this
                     Agreement  shall   include   the  corresponding  masculine,
                     feminine or neuter  forms,  and the singular form of nouns,
                     pronouns and verbs shall include the plural and vice versa.

(b)  For purposes of this  Agreement,  references to "other  enterprises"  shall
     include  employee  benefit  plans;  references to "fines" shall include any
     excise  taxes  assessed on a person with  respect to any  employee  benefit
     plan;  references to "serving at the request of the Company"  shall include
     any service as a director,  officer, employee or agent of the Company which
     imposes  duties  on, or  involves  services  by,  such  director,  nominee,
     officer,  employee or agent with respect to an employee  benefit plan,  its
     participants or beneficiaries.

     Section 7.15  Counterparts.  This  Agreement may be executed in two or more
counterparts,  each of which shall be deemed to be an original  and all of which
together shall be deemed to be one and the same instrument, notwithstanding that
both parties are not signatories to the original or same counterpart.

     Section   7.16   Certain   Persons   Not   Entitled   to   Indemnification.
Notwithstanding  any other provision of this Agreement,  Indemnitee shall not be
entitled to indemnification or advancement of Expenses hereunder with respect to
any Proceeding or any Claim,  issue or matter  therein,  brought or made by such
person against the Company,  except as  specifically  provided in Article III or
Article IV hereof.

     Section 7.17 Indemnification for Negligence, Gross Negligence, etc. Without
limiting the  generality  of any other  provision  hereunder,  it is the express
intent of this Agreement that Indemnitee be indemnified and Expenses be advanced
regardless of Indemnitee's acts of negligence,  gross negligence, intentional or

<PAGE>



willful  misconduct  to the  extent  that  indemnification  and  advancement  of
Expenses is allowed pursuant to the terms of this Agreement and under applicable
law.

     Section  7.18  Mutual  Acknowledgment.  Both  the  Company  and  Indemnitee
acknowledge  that in  certain  instances,  applicable  law or public  policy may
prohibit the Company  from  indemnifying  the  directors,  officers,  employees,
agents  or  fiduciaries  of the  Company  under  this  Agreement  or  otherwise.
Indemnitee  understands and acknowledges  that the Company has undertaken or may
be  required  in the  future  to  undertake  with the  Securities  and  Exchange
Commission  to submit  the  question  of  indemnification  to a court in certain
circumstances for a determination of the Corporation's right under public policy
to indemnify Indemnitee.

     Section 7.19  Enforcement.  The Company  agrees that its  execution of this
Agreement shall constitute a stipulation by which it shall be irrevocably  bound
in any court or arbitration in which a proceeding by Indemnitee for  enforcement
of his rights hereunder shall have been commenced,  continued or appealed,  that
its  obligations  set forth in this  Agreement are unique and special,  and that
failure of the  Company to comply with the  provisions  of this  Agreement  will
cause irreparable and irremediable  injury to Indemnitee,  for which a remedy at
law will be inadequate. As a result, in addition to any other right or remedy he
may  have  at law or in  equity  with  respect  to  breach  of  this  Agreement,
Indemnitee  shall be  entitled  to  injunctive  or  mandatory  relief  directing
specific performance by the Company of its obligations under this Agreement.

     Section 7.20  Successors  and Assigns.  All of the terms and  provisions of
this Agreement shall be binding upon, shall inure to the benefit of and shall be
enforceable  by the parties  hereto and their  respective  successors,  assigns,
heirs, executors, administrators, legal representatives.

     Section 7.21 Period of Limitations. No legal action shall be brought and no
cause  of  action  shall be  asserted  by or on  behalf  of the  Company  or any
affiliate of the Company  against  Indemnitee  or  Indemnitee's  spouse,  heirs,
executors,  or personal or legal  representatives  after the expiration of three
years from the date of  accrual of that cause of action,  and any claim or cause
of action of the  Company  or its  affiliate  shall be  extinguished  and deemed
released  unless  asserted by the timely  filing of a legal  action  within that
three-year period; provided, however, that, if any shorter period of limitations
is otherwise  applicable to any such cause of action,  the shorter  period shall
govern.


<PAGE>



     IN WITNESS WHEREOF,  this Agreement has been duly executed and delivered to
be effective as of the date first above written.

                              PIONEER NATURAL RESOURCES COMPANY



                              By:      /s/ Mark L. Withrow
                                     --------------------------
                              Name:    Mark L. Withrow
                              Title:   Executive Vice President


                              INDEMNITEE:


                             /s/ Scott D. Sheffield
                             ----------------------------------      
                             Scott D. Sheffield





<PAGE>


                                   Schedule I


I. Jon Brumley
Timothy L. Dove
Dennis E. Fagerstone
Mel Fischer
Mark L. Withrow
Lon C. Kile
M. Garrett Smith
R. Hartwell Gardner
John S. Herrington
Kenneth A. Hersh
James L. Houghton
Jerry P. Jones
Boone Pickens
Richard E. Rainwater
Charles E. Ramsey, Jr.
Arthur L. Smith
Philip B. Smith
Robert L. Stillwell
Michael D. Wortley




<PAGE>




                                                                     EXHIBIT 15

                               GATHERING AGREEMENT


     This  Agreement is made and entered into this 29th day of May, 1987, by and
between Mesa Operating Limited Partnership  ("Mesa") and Colorado Interstate Gas
Company ("CIG"), to be effective August 1, 1987.

     WHEREAS, Mesa and CIG have been involved in various disputes concerning the
operation of and the charges made to Mesa by CIG  regarding  the West  Panhandle
Field Gathering System (the "Gathering System"), through which natural gas which
is produced under the agreement, as amended and supplemented, entered on January
3, 1928, between Canadian River Gas Company,  as predecessor in interest to CIG,
and  Amarillo  Oil  Company,  as  predecessor  in  interest  to Mesa  (the  "'B'
Contract") is gathered and delivered; and

     WHEREAS,  the parties have resolved their disputes and have agreed upon the
appropriate  gathering  fees  to be  charged  in the  past,  and the  method  of
calculating  such fees in the future,  for  gathering  and  delivering  such gas
through the Gathering System; and

     WHEREAS,  the parties have agreed upon certain procedures to be followed in
order to avoid the recurrence of certain disputes regarding the operation of the
Gathering System in the future;

     NOW,  THEREFORE,  Mesa  and  CIG,  in  consideration  of  mutual  promises,
covenants, releases and agreements contained herein, do agree as follows:

                                       I.

     For all natural gas delivered  through the Gathering  System to Mesa or its
predecessor,  Amarillo  Oil  Company,  under  the 'B'  Contract  for the  period
commencing October 1, 1984,  through the Settlement Date as determined  pursuant
to  the  Agreement  of  Compromise  and  Settlement  between  the  parties  (the
"Settlement  Date"),  the amounts  which Mesa or its  predecessor,  Amarillo Oil
Company,  has  paid  to  CIG  shall  be  considered  to  be  full  and  complete
compensation for such gathering services. No further amounts shall be payable by
Mesa, nor shall any refunds be owed by CIG, for such gathering  services  during
such period, except for volumes delivered prior to the Settlement Date for which
payment  has not been made by that date.  Mesa and CIG agree that Mesa shall pay
CIG, as full and complete  compensation for such volumes delivered,  at the same
rate per Mcf that Mesa has been paying for  deliveries  during  prior  months in
1987, without regard to amounts invoiced by CIG.


                                       -1-

<PAGE>



                                       II.

     CIG shall deliver to Mesa at the inlet to the Fain Processing Plant or such
alternate delivery point as Mesa shall request (subject to CIG's right to reject
such request,  in whole or in part, in the reasonable exercise of its discretion
giving due consideration to the interests of both parties), the natural gas Mesa
is entitled to receive under the 'B' Contract.  For all such  deliveries to Mesa
for the period from the Settlement Date through December 31, 1989, the gathering
fee payable by Mesa to CIG shall be 44 cents per Mcf.


                                      III.

     For all natural gas produced  under the 'B' Contract and delivered  through
the Gathering System to Mesa on and after January 1, 1990, CIG shall calculate a
gathering fee which will be based upon its annual costs,  which shall be the sum
of (a) its  actual,  direct  out-of-pocket  expenses  (including  all  taxes not
related to income taxes) reasonably  incurred in operating the Gathering System;
(b) 20% of such actual,  direct  out-of-pocket  expenses to  compensate  CIG for
general and  administrative  expenses;  (c) depreciation on the original cost of
the  Gathering  System  at  the  applicable   depreciation  rate  for  gathering
facilities  owned by CIG, as  approved  in a final  order of the Federal  Energy
Regulatory  Commission (the "FERC"),  with such  depreciation  not to accumulate
beyond the gross  plant  cost;  and (d) a return  (including  taxes  relating to
return on equity) on net book value (original cost less accumulated depreciation
for the Gathering  System) at the applicable  overall rate of return provided to
CIG  in a  final  order  of the  FERC.  Items  (c)  and  (d)  will  be  adjusted
retroactively,  as appropriate,  to reflect the effect of any final order of the
FERC. Mesa shall provide its prorata share of fuel actually used at its own cost
(including any necessary  facilities)  for the gathering of all gas delivered to
Mesa,  and  such  fuel so  provided  by Mesa  shall  not be  included  in  CIG's
calculations  of cost in  operating  the  Gathering  System.  Mesa and CIG shall
pursue with  diligence the obtaining of any  necessary  regulatory  approvals to
carry out the terms of this Article III. CIG shall  calculate and Mesa shall pay
to CIG  each  month a  gathering  fee for the  volumes  gathered  for  Mesa  and
redelivered  from the  Gathering  System during that month.  Such  gathering fee
shall be  estimated  for each Mcf so  delivered on the basis of the prior year's
actual costs,  as set forth above,  divided by the total volumes of gas gathered
and redelivered  through the Gathering  System for the prior year. Such estimate
shall take into account any significant known and measurable changes expected to
occur  during  the next  billing  year,  if so  agreed to by both  parties.  The
estimated  billing basis will be furnished to Mesa on or before November 20th of
the prior year. On or before the April 30th  succeeding  each billing year,  CIG
shall account to Mesa for actual costs and volumes,  with any necessary  payment
by one party to the other party due 30 days after such accounting is received by
Mesa.

                                       IV.

     In the event that the FERC shall allocate or assign costs, by a final order
in any proceeding  involving  rates charged by CIG, to deliveries of natural gas
to Mesa through the  Gathering  System,  or otherwise  treat the  gathering  fee
payable by Mesa, as if the gathering fee were greater than the amount  otherwise
payable by Mesa to CIG, Mesa shall increase as of the effective date of the FERC

                                       -2-

<PAGE>



action the fee payable to CIG by an amount equal to 50 percent of the  increase,
as allocated to Mesa in the determination of CIG's rates. In the event that such
final order of the FERC shall have the effect of treating the  gathering  fee as
if it were greater than 20 cents per Mcf more than the  gathering  fee otherwise
payable by Mesa to CIG under this  Agreement,  then Mesa,  upon  request by CIG,
agrees to meet with CIG and enter into good-faith negotiations to determine what
new  arrangements,  if any, are equitable and reasonable under the circumstances
in existence.


                                       V.

     CIG shall operate the Gathering  System in a fair and equitable manner as a
prudent  operator and without undue  discrimination  so as to reasonably  assure
that Mesa  receives in the natural gas and drip  liquids,  if any,  delivered to
Mesa an average Btu content ("Delivered Btu")  representative of the average Btu
content found in the natural gas produced from all wells committed under the 'B'
Contract ("'B' Contract Btu").  In the event that the  Delivered  Btu during any
fiscal year exceeds two percent  (2%)  greater or less than the 'B' Contract Btu
during that fiscal year, CIG shall correct the imbalance in the Delivered Btu to
the  extent  such imbalance  exceeds two  percent  greater  or less than the 'B'
Contract Btu by delivering  natural gas containing a higher or lower average Btu
content than that contained  in the 'B' Contract Btu during the next fiscal year
and thereafter  until such time as the imbalance has been reduced to within such
two  percent  of the  average.  To the  extent  any  additional  facilities  are
reasonably  necessary to correct such  imbalance,  Mesa shall have the option to
request  the  installation  of such  facilities,  provided  that Mesa  agrees to
reimburse CIG for all costs  reasonably  incurred in constructing and installing
same.  If Mesa chooses not to request  installation  of such  facilities,  CIG's
obligation  to Mesa,  if any, to deliver  natural gas  containing  Delivered Btu
within two percent (2%) of the 'B' Contract Btu shall be suspended to the extent
such additional facilities are necessary.


                                       VI.

     CIG  acknowledges  that  Mesa is  involved  in a  pending  lawsuit.  (Mapco
Westpan, Inc. v. Pioneer Corp., Case No. 62,922-A, 47th Judicial District Court,
Potter  County,  Texas).  CIG agrees,  based upon Mesa's  claims of ownership to
certain drip liquids asserted in such lawsuit, to collect such drips, over which
it has  control,  on a monthly  basis,  and to use  reasonable  efforts  for the
marketing of such drips to achieve the highest net value.  As soon as reasonably
possible, CIG agrees to file with the District Court of Potter County, Texas, an
appropriate  interpleader  action wherein CIG shall tender on a continuing basis
the net revenues  attributable  to the sale of such drips,  into the registry of
such Court;  and petition such Court to ascertain the lawful owner of such drips
and the revenues  attributable  thereto.  In  consideration  of CIG's filing the
interpleader suit as required herein,  Mesa hereby agrees to defend,  indemnify,
and hold CIG  harmless  from and against any and all  claims,  damages,  losses,
causes of  actions,  judgments  or other  actions,  including  costs of suit and
attorneys fees, if any, which may arise directly from the  interpleader  suit to
be filed by CIG,  and which may be  brought  about,  through  and by virtue  of,
claims and/or demands with Mapco Westpan,  Inc., its predecessors and successors
in  interest  allege to have  suffered  as a result  of the  denial to it of the
possession of the drips as aforesaid.  Upon the conclusion of such  interpleader
action,  CIG  and  Mesa  shall  enter  into a new  arrangement,  if  applicable,
consistent with the court's judgment.

                                       -3-

<PAGE>



                                      VII.

     CIG and  Mesa  shall  keep  records  sufficient  to  document  requests  or
nominations by Mesa for gas deliveries  from CIG, and deliveries by CIG to Mesa.
Each party  shall have the right at all  reasonable  times to examine the books,
records  and  charts of the other  party to the extent  necessary  to verify the
accuracy  of any  request  or  nomination,  statement,  payment  calculation  or
determination  made pursuant to the provisions of this  Agreement.  If any error
shall be discovered,  proper adjustment and correction thereof shall be made and
any refunds due shall be made as promptly as practicable thereafter.

     IN WITNESS  WHEREOF,  the parties  hereto have caused these  presents to be
executed by their duly authorized  representatives  as of the date first written
above.

                                      MESA OPERATING LIMITED PARTNERSHIP

                                      By:      Pickens Operating Co.,
                                               General Partner



                                      By:   /s/   Paul W. Cain
                                            ----------------------------
                                               Paul W. Cain
                                               President


                                      COLORADO INTERSTATE GAS COMPANY



                                      By:   /s/   Michael Morris
                                            ----------------------------
                                               Michael Morris
                                               President


                                       -4-

<PAGE>




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<CIK> 0001038357
<NAME> PNRCO.
<MULTIPLIER> 1,000
       
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<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1997
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                                          0
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