NATURAL GAS PARTNERS II LP
SC 13D/A, 2000-04-10
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                 Schedule 13D/A


          Under the Securities Exchange Act of 1934 (Amendment No. 2)*



                               Prize Energy Corp.
- --------------------------------------------------------------------------------
                (formerly known as Vista Energy Resources, Inc.)
                                (Name of Issuer)

                     Common Stock, par value $.01 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    74267L106
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                              Richard L. Covington
                          125 E. John Carpenter Freeway
                                    Suite 600
                               Irving, Texas 75062
                                 (972) 432-1440
- --------------------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 March 31, 2000
- --------------------------------------------------------------------------------
                      (Date of Event which Requires Filing
                               of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Section 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box. [ ]

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Section 240.13d-7(b) for
other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 (the "Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).

<PAGE>   2

CUSIP NO. 74267L106                                               SCHEDULE 13D

<TABLE>
<S>       <C>                 <C>                                                               <C>
- --------------------------------------------------------------------------------------------------------------------
(1)   Names of Reporting Persons S.S. or I.R.S. Identification Nos. of Above Persons

          NATURAL GAS PARTNERS II, L.P.

- --------------------------------------------------------------------------------------------------------------------
(2)   Check the Appropriate Box if a Member of a Group (See Instructions)                                   (a)  [ ]
                                                                                                            (b)  [ ]
- --------------------------------------------------------------------------------------------------------------------
(3)   SEC Use Only
- --------------------------------------------------------------------------------------------------------------------
(4)   Source of Funds (See Instructions)                                                             OO (SEE ITEM 3)
- --------------------------------------------------------------------------------------------------------------------
(5)   Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)                        [ ]
- --------------------------------------------------------------------------------------------------------------------
(6)   Citizenship or Place of Organization      NATURAL GAS PARTNERS II, L.P. IS A LIMITED PARTNERSHIP
                                                FORMED UNDER THE LAWS OF THE STATE OF DELAWARE

- --------------------------------------------------------------------------------------------------------------------
      Number of            (7)      Sole Voting Power                                                        879,818
      Shares Bene-         -----------------------------------------------------------------------------------------
      ficially             (8)      Shared Voting Power                                                            0
      Owned by             -----------------------------------------------------------------------------------------
      Each                 (9)      Sole Dispositive Power                                                   879,818
      Reporting            -----------------------------------------------------------------------------------------
      Person With          (10)     Shared Dispositive Power                                                       0
- --------------------------------------------------------------------------------------------------------------------
(11)  Aggregate Amount Beneficially Owned by Each Reporting Person                                           879,818
- --------------------------------------------------------------------------------------------------------------------
(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)                        [ ]
- --------------------------------------------------------------------------------------------------------------------
(13) Percent of Class Represented by Amount in Row (11)                                                        6.5%*
- --------------------------------------------------------------------------------------------------------------------
(14) Type of Reporting Person (See Instructions)                                                                  PN
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

* Assumes the conversion of 3,984,197 shares of Series A 6% Convertible
Preferred Stock of the Company owned by Pioneer Natural Resources USA, Inc. into
3,984,197 shares of Common Stock of the Company and the purchase by the Company
of 1,346,482 of such shares of Common Stock.


                                     Page 2
<PAGE>   3
CUSIP NO. 74267L106                                               SCHEDULE 13D

<TABLE>
<S>                            <C>
- --------------------------------------------------------------------------------------------------------------------
(1)   Names of Reporting Persons S.S. or I.R.S. Identification Nos. of Above Persons

          G.F.W. ENERGY II, L.P.

- --------------------------------------------------------------------------------------------------------------------
(2)   Check the Appropriate Box if a Member of a Group (See Instructions)                                   (a)  [ ]
                                                                                                            (b)  [ ]
- --------------------------------------------------------------------------------------------------------------------
(3)   SEC Use Only
- --------------------------------------------------------------------------------------------------------------------
(4)   Source of Funds (See Instructions)                                                             OO (SEE ITEM 3)
- --------------------------------------------------------------------------------------------------------------------
(5)   Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)                        [ ]
- --------------------------------------------------------------------------------------------------------------------
(6)   Citizenship or Place of Organization      G.F.W. ENERGY II, L.P. IS A LIMITED PARTNERSHIP
                                                FORMED UNDER THE LAWS OF THE STATE OF DELAWARE
- --------------------------------------------------------------------------------------------------------------------
      Number of            (7)      Sole Voting Power                                                        879,818
      Shares Bene-         -----------------------------------------------------------------------------------------
      ficially             (8)      Shared Voting Power                                                            0
      Owned by             -----------------------------------------------------------------------------------------
      Each                 (9)      Sole Dispositive Power                                                   879,818
      Reporting            -----------------------------------------------------------------------------------------
      Person With          (10)     Shared Dispositive Power                                                       0
- --------------------------------------------------------------------------------------------------------------------
(11)  Aggregate Amount Beneficially Owned by Each Reporting Person                                           879,818
- --------------------------------------------------------------------------------------------------------------------
(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)                        [ ]
- --------------------------------------------------------------------------------------------------------------------
(13) Percent of Class Represented by Amount in Row (11)                                                        6.5%*
- --------------------------------------------------------------------------------------------------------------------
(14) Type of Reporting Person (See Instructions)                                                                  PN
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

* Assumes the conversion of 3,984,197 shares of Series A 6% Convertible
Preferred Stock of the Company owned by Pioneer Natural Resources USA, Inc. into
3,984,197 shares of Common Stock of the Company and the purchase by the Company
of 1,346,482 of such shares of Common Stock.


                                     Page 3
<PAGE>   4
CUSIP NO. 74267L106                                               SCHEDULE 13D

<TABLE>

<S>                    <C>                                                                     <C>
- --------------------------------------------------------------------------------------------------------------------
(1)   Names of Reporting Persons S.S. or I.R.S. Identification Nos. of Above Persons

          GFW II, L.L.C.
- --------------------------------------------------------------------------------------------------------------------
(2)   Check the Appropriate Box if a Member of a Group (See Instructions)                                   (a)  [ ]
                                                                                                            (b)  [ ]
- --------------------------------------------------------------------------------------------------------------------
(3)   SEC Use Only
- --------------------------------------------------------------------------------------------------------------------
(4)   Source of Funds (See Instructions)                                                              OO (SEE ITEM 3)
- --------------------------------------------------------------------------------------------------------------------
(5)   Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)                        [ ]
- --------------------------------------------------------------------------------------------------------------------
(6)   Citizenship or Place of Organization      GFW II, L.L.C. IS A LIMITED LIABILITY COMPANY
                                                FORMED UNDER THE LAWS OF THE STATE OF DELAWARE
- --------------------------------------------------------------------------------------------------------------------
     Number of         (7)      Sole Voting Power                                                            879,818
      Shares           ---------------------------------------------------------------------------------------------
    Beneficially       (8)      Shared Voting Power                                                                0
   Owned by Each       ---------------------------------------------------------------------------------------------
    Reporting          (9)      Sole Dispositive Power                                                       879,818
     Person            ---------------------------------------------------------------------------------------------
      With             (10)     Shared Dispositive Power                                                           0
- --------------------------------------------------------------------------------------------------------------------
(11)  Aggregate Amount Beneficially Owned by Each Reporting Person                                           879,818
- --------------------------------------------------------------------------------------------------------------------
(12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See Instructions)                        [ ]
- --------------------------------------------------------------------------------------------------------------------
(13) Percent of Class Represented by Amount in Row (11)                                                        6.5%*
- --------------------------------------------------------------------------------------------------------------------
(14) Type of Reporting Person (See Instructions)                                                                  PN
- --------------------------------------------------------------------------------------------------------------------
</TABLE>

* Assumes the conversion of 3,984,197 shares of Series A 6% Convertible
Preferred Stock of the Company owned by Pioneer Natural Resources USA, Inc. into
3,984,197 shares of Common Stock of the Company and the purchase by the Company
of 1,346,482 of such shares of Common Stock.


                                     Page 4
<PAGE>   5
     This Amendment No. 2 amends the Schedule 13D filed on November 6, 1998, as
amended on February 17, 2000 (the "Schedule 13D"), and relates to shares of
common stock, par value $.01 per share ("Common Stock"), of Prize Energy Corp.
(formerly known as Vista Energy Resources, Inc.), a Delaware corporation (the
"Company"). The Company's principal executive offices are located at 3500
William D. Tate, Suite 200, Grapevine, Texas 76051. Capitalized terms used
without definition in this Amendment No. 2 shall have the respective meanings
ascribed to them in the Schedule 13D. Use of the words "herein" and "hereof" are
references to the Schedule 13D.

ITEM 1. SECURITY AND ISSUER

     No modification.

ITEM 2. IDENTITY AND BACKGROUND

     No modification.

ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION

     Item 3 of the Schedule 13D is hereby amended by adding the following to the
end thereof:

     On March 31, 2000, a change in the percentage ownership of the reporting
person occurred solely as a result of the conversion of 3,984,197 shares of
Series A 6% Convertible Preferred Stock of the Company owned by Pioneer Natural
Resources USA, Inc. into 3,984,197 shares of Common Stock and the purchase by
the Company of 1,346,482 of such shares of Common Stock. Therefore, no funds or
consideration were expended by the reporting person.

ITEM 4. PURPOSE OF THE TRANSACTION

     No modification.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER.

     Parts (a) and (b) of Item 5 of Schedule 13D are hereby replaced in their
entirety as follows:

     (a) and (b) Each of the Partnership, GFW Energy II and GFW II is the
beneficial owner of 879,818 shares of the Common Stock which represent 6.5% of
the outstanding shares of Common Stock. Such shares include 368,109 shares
subject to purchase upon exercise of warrants which are currently exercisable at
an exercise price of $28.00 per share. Each such reporting person has the sole
power to vote and dispose of such shares.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER

     No modification.


                                     Page 5
<PAGE>   6
ITEM 7. MATERIAL TO BE FILED AS EXHIBITS

     No modification.

                                   SIGNATURES

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

Date: April 7, 2000               NATURAL GAS PARTNERS II, L.P.

                                  By: G.F.W. Energy II, L.P., its Sole General
                                  Partner
                                  By: GFW II, L.L.C., its Sole General Partner


                                  By:  /s/ David R. Albin
                                       ---------------------------------
                                       David R. Albin, Authorized Member


Date: April 7, 2000               G.F.W. ENERGY II, L.P.

                                  By: GFW II, L.L.C., its Sole General Partner


                                  By:  /s/ David R. Albin
                                       ---------------------------------
                                       David R. Albin, Authorized Member


Date: April 7, 2000               GFW II, L.L.C.


                                  By:  /s/ David R. Albin
                                       ---------------------------------
                                       David R.Albin, Authorized Member


The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative (other than the executive
officer or general partner of this filing person), evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

     ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE
FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).


                                     Page 6


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