<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>h84262sc13ga.txt
<DESCRIPTION>BILLY F MITCHAM JR FOR MITCHAM INDUSTRIES INC
<TEXT>

<PAGE>   1


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G
                                (AMENDMENT NO. 4)


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934



                            MITCHAM INDUSTRIES, INC.
                                (Name of Issuer)


                                  COMMON STOCK
                         (Title of Class of Securities)


                                   606501 104
                                 (CUSIP Number)


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



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

         [ ]  Rule 13d-1(b)
         [ ]  Rule 13d-1(c)
         [X]  Rule 13d-1(d)

*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 6 Pages
<PAGE>   2

CUSIP No. 606501 104                    13G                    Page 2 of 6 Pages



--------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Billy F. Mitcham, Jr.
--------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS)
      (a) [ ]

      (b) [ ]
--------------------------------------------------------------------------------
 3    SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                               5     SOLE VOTING POWER

          NUMBER OF
                                     723,638(1)
           SHARES              -------------------------------------------------
                               6     SHARED VOTING POWER
        BENEFICIALLY

          OWNED BY                   N/A
                               ------------------------------------------------
            EACH               7     SOLE DISPOSITIVE POWER

          REPORTING
                                     260,000
           PERSON              ------------------------------------------------
                               8     SHARED DISPOSITIVE POWER
           WITH:

                                     N/A
-------------------------------------------------------------------------------
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


      723,638(1)
--------------------------------------------------------------------------------
10    CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
      (SEE INSTRUCTIONS)

                                                                             [ ]
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)


      7.8%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON


      IN
--------------------------------------------------------------------------------
(1) See Statement 1



                               Page 2 of 6 Pages

<PAGE>   3


Item 1(a).  Name of Issuer.

            The name of the Issuer is Mitcham Industries, Inc.

Item 1(b).  Address of Issuer's Principal Executive Offices.

            P. O. Box 1175, Huntsville, Texas 77342.

Item 2(a).  Name of Persons Filing.

            This statement is being filed on behalf of Billy F. Mitcham, Jr.

Item 2(b).  Address of Principal Business Office or, if none, Residence.

            P. O. Box 1175, Huntsville, Texas 77342.

Item 2(c).  Citizenship.

            Billy F. Mitcham, Jr. is a citizen of the United States.

Item 2(d).  Title of Class of Securities.

            This statement relates to shares of Common Stock of the Issuer
            (the "Common Stock").

Item 2(e).  CUSIP Number.

            The CUSIP No. for the shares of Common Stock of the Issuer is
            606501 104.

Item 3.     Not Applicable.

Item 4.     Ownership.

            (a)  Amount beneficially owed: 723,638
            (b)  Percent of class:         7.8%
            (c)  Number of shares as to which person has:
                 (i)   Sole power to vote or to direct the vote:   723,638
                 (ii)  Shared power to vote or to direct the vote: NONE
                 (iii) Sole power to dispose or to direct the disposition
                       of:   260,000
                 (iv)  Shared power to dispose or to direct the disposition
                       of:   NONE


                               Page 3 of 6 Pages

<PAGE>   4


Item 5.  Ownership of Five Percent or Less of a Class.

         Not applicable

Item 6.  Ownership of More than Five Percent on Behalf of Another Person.

         Other then as set forth on Statement 1, no person has the right to
         receive or the power to direct the receipt of dividends from, or the
         proceeds from the sale of the securities reported. No such person set
         forth in Statement 1 has such rights relating to more than five percent
         of the class of securities.

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 Group.

         Not applicable

                               Page 4 of 6 Pages


<PAGE>   5


CUSIP No. 606501 104               13G                         Page 5 of 6 Pages



         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:  February 14, 2001

                                       /s/ BILLY F. MITCHAM, JR.
                                       -----------------------------------------
                                       Billy F. Mitcham, Jr.


                               Page 5 of 6 Pages

<PAGE>   6


                                  STATEMENT 1
                               TO AMENDMENT NO. 4
                                TO SCHEDULE 13G
                            OF BILLY F. MITCHAM, JR.



         The number of shares with respect to which the named reporting person
has sole voting power (723,638) includes 260,000 shares which he directly owns
and an aggregate of 245,638 shares of the indicated class of equity securities
owned by Billy F. Mitcham, Sr. (95,040 shares), Paul C. Mitcham (89,930 shares)
and two trusts established for the benefit of the named reporting person's sons
(60,668 shares), as to which the named reporting person has voting rights under
a Voting Agreement.

         Also included in the total number of shares to which the named
reporting person has sole voting power, when acquired, is an aggregate of
218,000 shares underlying currently exercisable options, as follows: Billy F.
Mitcham, Jr. (71,000 shares), Billy F. Mitcham, Sr. (45,500 shares), Paul C.
Mitcham (101,500 shares). All shares underlying the above-described options
granted to persons other than Billy F. Mitcham, Jr. will, when issued, be
subject to the above-described Voting Agreement.


                               Page 6 of 6 Pages














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