3DX TECHNOLOGIES INC
SC 13G/A, 1998-02-17
CRUDE PETROLEUM & NATURAL GAS
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                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC 20549

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

                                 SCHEDULE 13G
                                (RULE 13d-102)

                   INFORMATION TO BE INCLUDED IN STATEMENTS
                   FILED PURSUANT TO RULES 13D-1(b) AND (c)
                AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2

   
                             (AMENDMENT NO. 1  )*
    

                             3DX TECHNOLOGIES INC.

                               (Name of Issuer)

                    COMMON STOCK, PAR VALUE $.01 PER SHARE

                        (Title of Class of Securities)

                                  08554G 10 9

                                (CUSIP Number)



            *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 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).


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<PAGE>



- ------------------------------------         -----------------------------------
CUSIP NO. 88554G 10 9                  13G    PAGE    2    OF      5       PAGES
                                                    -----        -----      
- ------------------------------------         -----------------------------------


- --------------------------------------------------------------------------------
1       NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

        Douglas C. Nester

- --------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)  [   ]
                                                                      (b)  [   ]


- --------------------------------------------------------------------------------
3       SEC USE ONLY


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

        U.S.
- --------------------------------------------------------------------------------
                       
              5     SOLE VOTING POWER
NUMBER OF           377,592
SHARES        ------------------------------------------------------------------
BENEFI-       6     SHARED VOTING POWER
CIALLY              0
OWNED BY      ------------------------------------------------------------------
EACH          7     SOLE DISPOSITIVE POWER
REPORTING           377,592
PERSON        ------------------------------------------------------------------
WITH          8     SHARED DISPOSITIVE POWER
                    0
- --------------------------------------------------------------------------------
9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
        377,592
    
- --------------------------------------------------------------------------------
10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
        CERTAIN SHARES*                                                   |_|

- --------------------------------------------------------------------------------
11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
   
        5.2%
    
- --------------------------------------------------------------------------------
12      TYPE OF REPORTING PERSON*


        IN
- --------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



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<PAGE>



ITEM 1.

            (A)  NAME OF ISSUER.

            3DX Technologies Inc., a Delaware corporation (the "Issuer").

            (B)  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES.

            The  Issuer's  principal  executive  offices  are  located  at 12012
Wickchester, Suite 250, Houston, Texas 77079.

ITEM 2.

            (A) NAME OF PERSON FILING.

            This statement is filed by Douglas C. Nester ("Nester").

            (B)  ADDRESS OF PRINCIPAL BUSINESS OFFICE.

            The principal business office  of Nester is 12012 Wickchester, Suite
250, Houston, Texas 77079.

            (C)  CITIZENSHIP.

            Nester is a U.S. citizen.

            (D) TITLE OF CLASS OF SECURITIES.

            This statement relates to shares of Common Stock, par value $.01 per

share (the "Common Stock"), of the Issuer.

            (E)  CUSIP NUMBER.

            88554G 10 9

ITEM 3.     This statement is  not  being  filed   pursuant  to Rule 13d-1(b) or

13d-2(b).

ITEM 4.     OWNERSHIP.

            (A)  AMOUNT BENEFICIALLY OWNED.

   
            Nester beneficially owns 377,592 shares of Common Stock.
    


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<PAGE>



            (B)  PERCENT OF CLASS.1

   
            5.2%.
    

            (C)  POWER TO VOTE OR  DIRECT  THE  VOTE  AND  DISPOSE OR DIRECT THE

DISPOSITION OF SECURITIES.

   
            Nester  has sole  power to vote or  dispose or to direct the vote or
            disposition of the 377,592 shares of Common Stock beneficially owned
            by him. Of the 377,592 shares of Common Stock  beneficially owned by
            Nester,  20,144 shres of Common Stock are issuable  upon exercise of
            an option held by Nester.
    

ITEM 5.     OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

            If this  statement  is being filed to report the fact that as of the
            date  hereof the  reporting  person has ceased to be the  beneficial
            owner of more than five  percent of the class of  securities,  check
            the following [ ]

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 GROUP.

            Not applicable.

ITEM 10.    CERTIFICATION.

            Not applicable.

- --------
1           According to the most recently  available filing with the Securities
            and  Exchange  Commission  in which such  number is  required  to be
            indicated.


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<PAGE>


                                   SIGNATURE

            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.




Dated:  February 13, 1998                       /S/ DOUGLAS C. NESTER
                                          --------------------------------------
                                                    Douglas C. Nester




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