HANCOCK JOHN MUTUAL LIFE INSURANCE CO / MA
SC 13G/A, 1997-03-25
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                                                              


                                  SCHEDULE 13G




                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*


                             Kelley Oil & Gas Corp.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
                 $2.625 Convertible Exchangeable Preferred Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
                                    487906208
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


Check  the  here if a fee is  being  paid  with  this  statement:  (A fee is not
required  only if the  filing  person:  (1)  has a  previous  statement  on file
reporting  beneficial  ownership  of more  than  five  percent  of the  class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7).

*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 the
disclosures provided in a prior cover page.

The information required in 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 ("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 1 OF 7 PAGES
<PAGE>

- ---------------------                                      ---------------------
CUSIP No.   487906208                   13G                Page  2  of  7  Pages
- ---------------------                                      ---------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Mutual Life Insurance Company
          I.R.S. No. 04-1414660
- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)  |_|
                                                                        (b)  |_|
          N/A
- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

                   -------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

                   -------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

                   -------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None.
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.
- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          IC, BD, IA, HC
- --------------------------------------------------------------------------------










                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 2 OF 7 PAGES
<PAGE>

- ---------------------                                      ---------------------
CUSIP No.   487906208                   13G                Page  3  of  7  Pages
- ---------------------                                      ---------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Subsidiaries, Inc.
          I.R.S. No. 04-2687223
- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)  |_|
                                                                        (b)  |_|
          N/A
- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
- --------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

                   -------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

                   -------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

                   -------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None.
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.
- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          HC
- --------------------------------------------------------------------------------










                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 3 OF 7 PAGES
<PAGE>

     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 an executive
officer  or   general   partner  of  the   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.

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission.

     Attention:  Intentional  misstatements  or  omissions  of  fact  constitute
Federal criminal violations (See 18 U.S.C. 1001)


     Item 1(a)      Name of Issuer:
                    Kelley Oil & Gas Corp.

     Item 1(b)      Address of Issuer's Principal Executive Offices:
                    601 Jefferson, Suite 1100
                    Houston, TX 77002

     Item 2(a)      Name of Person Filing:
                    John Hancock Mutual Life Insurance Company ("JHMLICO"),  and
                    JHMLICO's    wholly   owned    subsidiary,    John   Hancock
                    Subsidiaries, Inc. ("JHSI").

     Item 2(b)      Address of the Principal Offices:
                    The  principal  business  offices  of  JHMLICO  and JHSI are
                    located at John  Hancock  Place,  P.O. Box 111,  Boston,  MA
                    02117.

     Item 2(c)      Citizenship:
                    JHMLICO  was  organized  and  exists  under  the laws of the
                    Commonwealth of Massachusetts. JHSI was organized and exists
                    under the laws of the State of Delaware.

     Item 2(d)      Title of Class of Securities:
                    $2.625 Convertible Exchangeable Preferred Stock

     Item 2(e)      CUSIP Number:
                    487906208

     Item 3         If the Statement is being filed  pursuant to Rule  13d-1(b),
                    or 13d-2(b), check whether the person filing is a:

                    JHMLICO:  (a) (X)   Broker or Dealer registered under ss.15 
                                        of the Act.

                              (c) (X)   Insurance Company as defined in 
                                        ss.3(a)(19) of the Act.

                              (e) (X)   Investment Adviser registered under
                                        ss.203 of the Investment Advisers Act of
                                        1940.

                    JHSI:     (g) (X)   Parent Holding Company, in accordance 
                                        with ss.240.13d-1(b)(ii)(G).









                                PAGE 4 OF 7 PAGES

<PAGE>

     Item 4         Ownership:

                    (a)    None

                    (b)    Percent of Class:   0.0%

                    (c)    (i)     sole power to vote or to direct the vote:
                                   -0-

                           (ii)    shared power to vote or to direct the vote: 
                                   -0-

                           (iii)   sole power to dispose or to direct the
                                   disposition of:  -0-

                           (iv)    shared power to dispose or to direct the 
                                   disposition of:  -0-

     Item 5         Ownership of Five Percent or Less of a Class:
                    With this filing,  the Reporting Persons state that they own
                    no shares of the class.

     Item 6         Ownership of More than Five Percent on Behalf of Another 
                    Person:
                    Not applicable.

     Item 7         Identification  and  Classification  of the Subsidiary which
                    Acquired  the  Security  Being  Reported  on by  the  Parent
                    Holding Company:
                    Not applicable.

     Item 8         Identification and Classification of Members of the Group:
                    Not applicable.

     Item 9         Notice of Dissolution of a Group:
                    Not applicable.

     Item 10        Certification:
                    By signing below the undersigned certifies that, to the best
                    of its  knowledge  and belief,  the  securities  referred to
                    above were  acquired in the ordinary  course of business and
                    were not  acquired  for the  purpose  of and do not have the
                    effect of changing or influencing  the control of the issuer
                    of such  securities and were not acquired in connection with
                    or as a participant in any  transaction  having such purpose
                    or effect. 























                                PAGE 5 OF 7 PAGES
<PAGE>

                                   SIGNATURE

     After reasonable inquiry and to the best of its knowledge and belief,  each
of the undersigned certifies that the information set forth in this statement is
true, complete and correct.


                                      John Hancock Mutual Life Insurance Company
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: March 24, 1997                 Title:   Senior Vice President & Treasurer


                                      John Hancock Subsidiaries, Inc.
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: March 24, 1997                 Title:   Senior Vice President & Treasurer




















































                                PAGE 6 OF 7 PAGES
<PAGE>

                                                                       EXHIBIT A
                             JOINT FILING AGREEMENT

     John Hancock Mutual Life Insurance Company, and John Hancock  Subsidiaries,
Inc.  hereby agree that the  Terminating  Schedule 13G Amendment No. 1, to which
this  Agreement is  attached,  relating to the $2.625  Convertible  Exchangeable
Preferred Stock, is filed on behalf of each of them.


                                      John Hancock Mutual Life Insurance Company
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: March 24, 1997                 Title:   Senior Vice President & Treasurer


                                      John Hancock Subsidiaries, Inc.
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: March 24, 1997                 Title:   Treasurer


















































                                PAGE 7 OF 7 PAGES




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