3DX TECHNOLOGIES INC
S-3, 1998-09-09
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>



    As filed with the Securities and Exchange Commission on September 9, 1998
                                                    Registration No. 333-_______
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  ____________

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933
                                  ____________

                              3DX TECHNOLOGIES INC.
               (Exact name of registrant as specified in charter)

        Delaware                                               76-0386601
(State or other jurisdiction of                             (I.R.S. employer
incorporation or organization)                            identification number)

                          12012 Wickchester, Suite 250
                              Houston, Texas 77079
                                 (281) 579-3398
   (Address, including zip code, and telephone number, including area code, of
                    registrant's principal executive offices)
                                  ____________

                                 Ronald P. Nowak
                      President and Chief Executive Officer
                          12012 Wickchester, Suite 250
                              Houston, Texas 77079
                                 (281) 579-3398
           (Name and address, including zip code and telephone number,
                   including area code, of agent for service)
                                  ____________
                                 with a copy to:
                             Jay R. Schifferli, Esq.
                            Kelley Drye & Warren LLP
                               Two Stamford Plaza
                              281 Tresser Boulevard
                           Stamford, Connecticut 06901
                                 (203) 324-1400

     Approximate  date of commencement of proposed sale of the securities to the
public: From time to time after this Registration Statement becomes effective.
     If the only  securities  being  registered  on this Form are being  offered
pursuant to dividend or interest  reinvestment plans, please check the following
box. |_|
     If any of the securities being registered on this form are to be offered on
a delayed or continuous  basis  pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. |X|
     If this form is filed to  register  additional  securities  for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering. |_| ____
     If this form is a  post-effective  amendment  filed pursuant to Rule 462(c)
under the  Securities  Act,  check the following box and list the Securities Act
registration  statement number of the earlier effective  registration  statement
for the same offering. |_| _________
     If delivery of the prospectus is expected to be made  pursuant to Rule 434,
please check the following box.  |_|



                         CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>

====================================================================================================================================

          Title of shares                 Amount to be       Proposed maximum offering      Proposed maximum            Amount of
         to be registered                  registered            price per share(1)        aggregate offering       registration fee
                                                                                                price(1)
- ------------------------------------------------------------------------------------------------------------------------------------

<S>                                      <C>                           <C>                     <C>                         <C>    
Common Stock, par value $.01 per         3,411,318                     $0.50(2)                $1,705,659                  $516.87
share
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
  
       (1) Estimated solely for the purpose  of calculating  the  registration
fee pursuant to Rule 457.
         (2) Based on the average of the  high  and the low prices of the Common
Stock on the Nasdaq  National  Market on September 8, 1998.
         The Registrant hereby amends this  Registration  Statement on such date
or dates as may be necessary to delay its  effective  date until the  Registrant
shall file a further amendment which specifically  states that this Registration
Statement shall  thereafter  become effective in accordance with Section 8(a) of
the Securities  Act of 1933 or until this  Registration  Statement  shall become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.

================================================================================

<PAGE>

INFORMATION   CONTAINED  HEREIN  IS  SUBJECT  TO  COMPLETION  OR  AMENDMENT.   A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.

<PAGE>
                 Subject to completion, dated September 9, 1998
PROSPECTUS

                               ___________ SHARES

                              3DX TECHNOLOGIES INC.
                          COMMON STOCK ($.01 PAR VALUE)

              This Prospectus relates to the offer and sale of __________ shares
(the "Shares") of common stock,  par value $.01 per share ("Common  Stock"),  of
3DX  Technologies  Inc.  ("3DX" or the  "Company")  by or on  behalf of certain
stockholders of the Company ("Selling Stockholders").

              The  Shares  may be  offered  and sold from time to time by one or
more of the Selling Stockholders, however, no Selling Stockholder is required to
offer or sell any of his or its  Shares.  The  Selling  Stockholders  anticipate
that,  if and when  offered  and sold,  the Shares  will be offered  and sold in
transactions  (which may  include  block  transactions)  effected  on the Nasdaq
National Market at the then prevailing market prices.  The Selling  Stockholders
reserve the right,  however,  to offer and sell the Shares on any other national
securities  exchange on which the Common Stock is or may become listed or in the
over-the-counter  market,  in each case at then prevailing  market prices, or in
privately negotiated  transactions as a price then to be negotiated.  All offers
and sales made on the Nasdaq  National  Market or any other national  securities
exchange or in the  over-the-counter  market will be made through or to licensed
brokers  and  dealers.  All  proceeds  from the sale of the Shares  will be paid
directly to the Selling  Stockholders  and will not be  deposited  in an escrow,
trust or other  similar  arrangement.  The  Company  will not receive any of the
proceeds from the sales by the Selling Stockholders.  No discounts,  commissions
or other compensation will be allowed or paid by the Selling Stockholders or the
Company in connection  with the offer and sale of the Shares,  except that usual
and customary brokers' commissions may be paid by the Selling Stockholders. Upon
any  sale  of  the  Shares  offered  hereby,   the  Selling   Stockholders   and
participating  agents,  brokers or dealers may be deemed to be  underwriters  as
that term is defined in the Securities Act of 1933, as amended (the  "Securities
Act"), and commissions or discounts or any profit realized on the resale of such
securities  purchased by them may be deemed to be  underwriting  commissions  or
discounts under the Securities Act.

              The Company has agreed to indemnify the Selling Stockholders, and
the Selling  Stockholders  have agreed to indemnify  the Company,  its officers,
directors, employees, agents and controlling persons against certain liabilities
arising  in  connection  with this  offering,  including  liabilities  under the
Securities  Act. The Company will pay all expenses  incurred in connection with
this offering,  excluding  commissions charged by any broker or dealer acting on
behalf  of a Selling  Stockholder.  The  legal,  accounting  and other  fees and
expenses to be paid by the  Company  related to the offer and sale of the Shares
contemplated hereby are estimated to be $____________.

              The Common Stock is quoted on the Nasdaq National Market under the
symbol "TDXT".  On September 8, 1998, the last reported sale price of the Common
Stock on the Nasdaq National Market was $0.56.

                                  ____________


THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.  SEE "RISK FACTORS"
BEGINNING ON PAGE 4.

                                  ____________


THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
                                  ____________

               The date of this Prospectus is September __, 1998.

<PAGE>


              No person is  authorized  in  connection  with the  offering  made
hereby to give any  information or to make any  representation  not contained in
this Prospectus.  If given or made, such information or representation  must not
be relied upon as having been authorized by the Company. Neither the delivery of
this   Prospectus  nor  any  offer  or  sale  made  hereunder  shall  under  any
circumstances  create any implication  that the information  contained herein is
correct as of any time  subsequent to the date hereof.  This Prospectus does not
constitute an offer to sell or a solicitation  of an offer to buy any securities
in any  jurisdiction  to any person to whom it would be unlawful to make such an
offer or solicitation in such jurisdiction.

                              AVAILABLE INFORMATION

              The Company is subject to the  informational  requirements  of the
Exchange Act and in accordance  therewith  files reports,  proxy  statements and
other   information   with  the   Securities   and  Exchange   Commission   (the
"Commission").  Such reports,  proxy  statements  and other  information  can be
inspected  and  copied at the  public  reference  facilities  maintained  by the
Commission at Judiciary  Plaza, 450 Fifth Street,  N.W., Room 1024,  Washington,
D.C. 20549; at Citicorp Center,  500 West Madison Street,  Suite 1400,  Chicago,
Illinois 60661; and at Seven World Trade Center,  13th Floor, New York, New York
10048. In addition, the Company is required to file electronic versions of these
documents  through the  Commission's  Electronic  Data  Gathering,  Analysis and
Retrieval  system  (EDGAR).  The  Commission  maintains a World Wide Web site at
http://www.sec.gov  that contains reports,  proxy and information statements and
other  information  regarding  registrants  that  file  electronically  with the
Commission.  Copies of such  material may also be obtained at  prescribed  rates
from the Public  Reference  Section of the Commission,  450 Fifth Street,  N.W.,
Judiciary Plaza, Room 1024,  Washington,  D.C. 20549. The Common Stock is quoted
on the Nasdaq National Market.

              The Company has filed with the Commission a Registration Statement
on Form S-3, as amended (the "Registration Statement"), under the Securities Act
with respect to the securities being offered by this Prospectus. As permitted by
the rules and  regulations of the  Commission,  this Prospectus does not contain
all the  information  set forth in the  Registration  Statement and the exhibits
thereto.  For further  information with respect to the Company and the offer and
sale of the securities,  reference is made to the Registration Statement and the
exhibits  thereto.  Statements  contained  in  this  Prospectus  concerning  the
provisions of documents  filed with the  Registration  Statement as exhibits are
necessarily summaries of such documents, and each such statement is qualified in
its entirety by reference to the copy of the applicable  document filed with the
Commission.  The Registration  Statement may be inspected  without charge at the
office of the Commission at 450 Fifth Street, N.W., Washington,  D.C. 20549, and
copies  of all or any  part  thereof  may be  obtained  from the  Commission  at
prescribed rates.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

              The following  documents  previously filed by the Company with the
Commission  pursuant to the Exchange Act are hereby incorporated by reference in
this Prospectus:

              (a)     Annual  Report  on  Form  10-K  for  the fiscal year ended
                      December 31, 1997;

              (b)     Quarterly  Reports  on  Form  10-Q  for the quarters ended
                      March 31, 1998 and June 30, 1998;

              (c)     Current Report on Form 8-K dated September 9, 1998; and

              (d)     The   description  of  the  Common  Stock  offered  hereby
                      contained in the Company's  Registration Statement on Form
                      8-A which was  declared  effective  by the  Commission  on
                      December 9, 1996.

                                       2

<PAGE>

              All  documents  filed by the Company  pursuant to Sections  13(a),
13(c),  14 (other than, in the case of the Company's Proxy  Statement,  portions
thereof not deemed to be "filed" for the  purposes of Section 18 of the Exchange
Act) and 15(d) of the Exchange Act subsequent to the date of this Prospectus and
prior to the  termination of the offering of the securities to be made hereunder
shall be  deemed to be  incorporated  herein  by  reference  and shall be a part
hereof from the date of filing of such documents.  Any statement  contained in a
document  incorporated or deemed to be incorporated by reference herein shall be
deemed to be modified or  superseded  for  purposes  of this  Prospectus  to the
extent  that a statement  contained  herein or in any other  subsequently  filed
document  which  also is or is deemed to be  incorporated  by  reference  herein
modifies  or  supersedes  such  statement.  Any such  statement  so  modified or
superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of the Registration Statement or this Prospectus.

              The Company will provide  without  charge to each person to whom a
copy of this  Prospectus is delivered,  upon the written or oral request of such
person,  a copy of the  documents  incorporated  herein  or in the  Registration
Statement  by  reference  (other than  exhibits to such  documents,  unless such
exhibits are  specifically  incorporated  by reference into the  information the
Registration Statement so incorporates).  Written or telephone requests for such
documents should be directed to Investor Relations Department,  3DX Technologies
Inc.,  12012  Wickchester,  Suite 250,  Houston,  Texas 77079,  telephone  (281)
579-3398.

               SPECIAL NOTE REGARDING FORWARD-LOOKING INFORMATION

              Certain  statements  in the  materials  given  to  the  Purchasers
including statements regarding  anticipated capital  expenditures,  estimates of
proved reserves, future rates of production,  future growth, future exploration,
future seismic data (including timing and results),  future reserves,  revenues,
future  drilling  (including  the  timing and  results  thereof),  expansion  of
operations,  generation of additional prospects and results of current or future
prospects,  future reserves and future leases, and other land rights,  timing of
capital  expenditures  and regulatory  reform,  and other  statements  contained
herein  regarding  matters that are not historical  facts,  are  forward-looking
statements (as such term is defined in the Private Securities  Litigation Reform
Act  of  1995).  The  words  "budgeted",  "anticipate,"  "project,"  "estimate,"
"expect," "may," "believe,"  "potential" and similar  statements are intended to
be among the  statements  that are  forward  looking  statements.  Because  such
statements include risks and uncertainties, actual results may differ materially
from those expressed or implied by such forward-looking statements. Factors that
could cause actual results to differ materially include, but are not limited to,
those discussed under "Risk Factors" and in the Company's filings with the SEC.

                                   THE COMPANY

3DX  Technologies  Inc.  ("the  Company")  is  a  knowledge-based  oil  and  gas
exploration company whose core competence and strategic focus is the utilization
of 3-D  seismic  imaging  and other  advanced  technologies  in the  search  for
commercial quantities of hydrocarbons. The Company enters into partnerships that
enable  it to  combine  its  expertise  and  exploration  capabilities  with the
operating  skills of other oil and gas companies.  The Company  participates  in
selected exploration projects as a non-operating working interest owner, sharing
both risks and rewards with its partners.  The Company  commenced  operations in
January 1993 to take advantage of perceived  opportunities emerging from changes
in the domestic oil and gas industry,  including the divestiture of domestic oil
and gas  properties,  advances in technology and the  outsourcing of specialized
technical  capabilities.  By  reducing  drilling  risk  through  3-D imaging and
analysis,  the Company seeks to improve the expected return on investment in its
oil and gas projects.  In mid 1998,  the Company  changed its business model for
entering new 3-D projects. The Company has begun to form strategic relationships
with knowledge based  generators and to fund potential  projects  earlier in the
process of the project generation. By providing capital in the earlier stages of
a  project  instead  of the  3-D  acquisition  point,  the  strengths  of 3DX as
explorationists and project managers can be realized with promotion of the deals
and recovery of costs. As of August 1998, the

                                       3

<PAGE>


Company's portfolio included 45 prospects identified on 12 separate 3-D projects
primarily  located  onshore  within the Gulf Coast  region  from South  Texas to
Louisiana.  Although the Company's  geographic  focus was  principally  the Gulf
Coast region, the Company has and will continue to pursue opportunities that may
become  available  in other  select  geographic  areas as its capital  resources
increase.]

              The  Company  was  incorporated  under  the  laws of the  State of
Delaware  in 1992.  Its offices  are  located at 12012  Wickchester,  Suite 250,
Houston, Texas 77079 and its telephone number is (281) 579-3398.



                                  RISK FACTORS

      IN  ADDITION  TO THE  OTHER  INFORMATION  AND  FINANCIAL  DATA  SET  FORTH
ELSEWHERE IN THIS  PROSPECTUS,  THE FOLLOWING  RISK FACTORS SHOULD BE CONSIDERED
CAREFULLY IN  EVALUATING  THE COMPANY AND ITS  BUSINESS  BEFORE  PURCHASING  THE
SHARES OF COMMON STOCK OFFERED HEREBY.

Limited Operating History and Significant Historical Operating Losses

           The Company  commenced its  operations in 1993 and has only a limited
operating  history.  Potential  investors,  therefore,  have limited  historical
financial  and  operating  information  upon which to base an  evaluation of the
Company's  performance and an investment in shares of Common Stock. For example,
the  producing  wells  within  exploration  projects  in which  the  Company  is
participating  have  been  on  production  only  for a  short  period  of  time.
Therefore,  estimations  with respect to the proved reserves and level of future
production  attributable to these wells are difficult to determine and there can
be no assurance as to the volume of  recoverable  reserves that will be realized
from such wells.  The  Company's  prospects  must be  considered in light of the
risks,  expenses and  difficulties  frequently  encountered  by companies in the
early  stages  of  their  development.  The  Company  has  incurred  significant
operating  and net  losses to date.  Net  losses  for  1995,  1996 and 1997 were
approximately $2.5 million, $2.7 million and $11 million,  respectively. At June
30,  1998,  the  Company  had an  accumulated  deficit  of  $26.2  million.  The
development of the Company's  business and its  participation in an increasingly
larger number of projects has required and will continue to require  substantial
expenditures.  The Company's future  financial  results will depend primarily on
its ability to economically  locate  hydrocarbons in commercial  quantities,  to
provide drilling site and target depth  recommendations  resulting in profitable
productive  wells  and on the  market  prices  for oil and gas.  There can be no
assurance  that the Company  will achieve or sustain  profitability  or positive
cash flows from  operating  activities in the future.  As of June 30, 1998,  the
Company  had a  deficit  in  working  capital  of  approximately  $2.8  million.
Management of the Company  continues to be actively  engaged in  soliciting  new
equity investors to provide funding for its capital  program.  Management of the
Company understands that the Company's business requires substantial oil and gas
expenditures  and that additional  financing will be required to completely fund
its  capital  program.  The  lack  of firm  commitments  for  additional  equity
financing  at this time,  combined  with a deficit in  working  capital,  raises
uncertainty about the ability of the Company to continue as a going concern.  In
the  absence of  additional  funding,  the Company may be required to reduce its
planned level of capital  expenditures or pursue other  financial  alternatives,
which could include a sale or merger of the Company.

VOLATILITY OF OIL AND GAS PRICES

           The Company's  revenues,  profitability,  cash flow and future growth
are  affected by changes in  prevailing  oil and gas prices.  Oil and gas prices
have been subject to wide fluctuations in recent years in response to relatively
minor changes in the supply and demand for oil and gas, market uncertainty and a
variety  of  additional  factors  that are beyond  the  control of the  Company,
including economic,  political and regulatory  developments and competition from
other sources of energy. It is impossible to predict 

                                       4

<PAGE>

future oil and gas price  movements.  Currently,  the Company does not engage in
hedging  activities.  As a result, the Company may be more adversely affected by
fluctuations  in oil and gas prices  than other  industry  participants  that do
engage in such activities.  No assurances can be given as to the future level of
activity  in the  oil and  gas  exploration  and  development  industry  and its
relationship to the future demand for the expertise  offered by the Company.  An
extended  or  substantial  decline in oil and gas  prices  could have a material
adverse  effect on the Company's  financial  position and results of operations,
the volume of oil and gas that may be  economically  produced by  operations  of
projects in which the Company participates and the Company's access to capital.

NON-OPERATOR STATUS

           The Company  relies upon other  project  partners to provide  certain
project operations including land acquisition,  drilling,  marketing and project
administration.  As a result, the Company has only a limited ability to exercise
control over a significant  number of a project's  operations or the  associated
costs of such operations. The success of a project is dependent upon a number of
factors  which are  outside  of the  Company's  area of  expertise  and  project
responsibilities.  Such factors include: (i) the availability of favorable lease
terms and required  permitting  for projects,  (ii) the  availability  of future
capital  resources by the Company and the other  participants for the purchasing
of leases and the drilling of wells, (iii) the approval of other participants to
the  purchasing  of leases and the drilling of wells on the  projects,  (iv) the
economic  conditions  at the time of  drilling,  including  the  prevailing  and
anticipated  prices  for oil and gas and  (v) the  ability  of the  operator  to
successfully and adequately  perform its tasks. The Company's  reliance on other
project  partners and its limited  ability to directly  control  certain project
costs could have a material  adverse effect on the realization of expected rates
of return on the Company's investment in projects.

ABILITY TO DISCOVER ADDITIONAL RESERVES

           The  Company's  future  success  is  dependent  upon its  ability  to
economically  locate  additional oil and gas reserves in commercial  quantities.
The Company's ability to do so is dependent upon a number of factors,  including
its  participation  in  multiple  exploration  projects  and  its  technological
capability to locate oil and gas in commercial quantities.  The Company does not
yet generate or develop its own projects and no assurances can be given that the
Company will have the opportunity to participate in projects which  economically
produce  commercial  quantities of hydrocarbons in amounts necessary to meet its
business  plan or that the  projects in which it elects to  participate  will be
successful.   Except  to  the  extent  that  the  Company  successfully  locates
commercial  quantities of  economically  recoverable  oil and gas, the Company's
proved reserves will decline as reserves are produced. There can be no assurance
that the Company will be able to discover  additional  commercial  quantities of
oil and gas or that the Company's  project  partners will have success  drilling
productive wells and acquiring properties at low finding costs.

SUBSTANTIAL CAPITAL REQUIREMENTS AND LIQUIDITY

         To date, net cash provided by operating activities has been limited and
the  Company  has  funded  its oil and gas  exploration  activities  principally
through cash provided by the sale of equity  securities and long-term  debt. The
Company's  business requires  substantial oil and gas capital  expenditures.  To
achieve its near-term  goals,  the Company has been and will be required to make
oil and gas capital  expenditures  substantially  in excess of its net cash flow
from operations in order to acquire, explore and develop oil and gas properties.
The level of  capital  spending  in 1998 will be  dependent  upon the  Company's
ability to obtain additional sources of funding.

         As of June 30,  1998,  the Company had a deficit in working  capital of
approximately $2.8 million.  On December 18, 1997, the Company executed a credit
agreement  with a commercial  bank,  the borrowing  capacity of which was set at
$2.0 million in April 1998.  During the quarter ended June 30,

                                       5

<PAGE>


1998, the Company borrowed $2.0 million under the credit agreement.  Such amount
is the  maximum  amount  currently  available  for  borrowing  under the  credit
facility.  The  borrowing  capacity is a function of the value of the  Company's
proved oil and gas reserves,  and is  redetermined on a semi-annual  basis.  The
bank is currently conducting a scheduled  redetermination.  Although the Company
increased  its proved  reserves as a result of  successful  drilling  operations
during the quarter ended June 30, 1998,  the bank has not  concluded  whether it
will  increase  the  borrowing  capacity at this time.  The credit  agreement is
secured  by  substantially  all of the  Company's  oil  and gas  properties  and
contains  restrictions on dividends and additional  liens and  indebtedness  and
requires  the  maintenance  of a minimum  current  ratio and net worth,  each as
defined in the credit  agreement.  As of June 30,  1998,  the Company was not in
compliance with certain covenants of the credit agreement  pertaining to minimum
working  capital  and aging of  accounts  payable.  The bank has agreed to waive
these instances of non-compliance  through September 30, 1998. In the absence of
an improvement in the Company's  working capital accounts payable aging,  future
waivers from the bank will be necessary.

         As a result of the Company's periodic review of each of its oil and gas
exploration and development  properties and its available  capital,  the Company
has  occasionally  sold  partial  interests  in specific oil and gas projects to
other investors to reduce its total investment  commitment to such projects.  No
gain or loss has been recognized on these transactions. The Company is currently
reviewing  its  portfolio  to  identify  properties  to be  marketed to industry
partners  for  cash  consideration,   reversionary  working  interests  or  some
combination  thereof.  Such  interests may consist of both  producing  wells and
future drilling locations. There can be no assurance,  however, that the Company
will be able to sell any such  interests,  or that the  terms of such  potential
sales would be acceptable to the Company.

         The  Company  will  require  additional  sources of  financing  to fund
drilling  expenditures  on properties  currently  owned by the Company and, to a
lesser extent,  to fund leasehold costs and geological and geophysical  costs on
its active  exploration  projects.  The Company generally has the right, but not
the obligation, to participate for its percentage interest in drilling wells and
can decline to participate if it does not have sufficient  capital  resources at
the time such drilling operations are proposed. The Company can also potentially
transfer  its right to  participate  in drilling  wells in exchange  for cash, a
reversionary interest, or some combination thereof. To recover its investment in
unevaluated properties, it is necessary for the Company to either participate in
drilling which finds commercial oil and gas production and produce such reserves
or receive sufficient value through the sale or transfer of its interests.

         The  Company  expects  that its  projected  cash flows  from  currently
producing   properties   will  be  sufficient  to  fund  its  cash  general  and
administrative  costs for the reminder of 1998, including technical employee and
related costs which are capitalized under full-cost accounting,  however,  these
cash flows are not  projected to be  sufficient  to fund the current  deficit in
working  capital.  The  Company's  projections  of  cash  flows  from  currently
producing  properties  could be  adversely  affected  by declines in oil and gas
prices below  current  levels or  anticipated  seasonal  lows and  unanticipated
declines in oil and gas production from existing properties.

         The Company intends to seek additional financing to satisfy its capital
requirements.  The  Company  is  currently  evaluating  alternatives  to  obtain
additional equity  financing,  which include sales of common or preferred stock.
In the absence of additional financing,  the Company anticipates that it will be
required to modify the  implementation and timing of its oil and gas exploration
and development  capital  spending for 1998 and 1999, which  modification  could
have a material  adverse  effect on the Company.  No assurance can be given that
the Company will be able to obtain additional  financing on terms which would be
acceptable  to the  Company,  if at  all.  The  Company's  inability  to  obtain
additional  financing would have a material  adverse effect on the Company.  The
lack of firm  commitments for equity  financing at this time,  combined with the
deficit in working capital,  raises uncertainty about the ability of the Company
to  continue  as a going  concern.  In the absence of  additional  funding,  the
Company may be required to reduce its planned level of capital  expenditures  or
pursue other financial alternatives, which could include a sale or merger of the
Company.

                                       6

<PAGE>


UNCERTAINTY OF ESTIMATES OF OIL AND GAS RESERVES

           There are numerous  uncertainties  inherent in estimating oil and gas
reserves and in projecting future rates of production.  Petroleum engineering is
a subjective process of estimating underground accumulations of oil and gas that
cannot be measured in an exact manner. Estimates of economically recoverable oil
and gas  reserves  and of future net cash flows depend upon a number of variable
factors and  assumptions,  such as historical  production from the area compared
with production from other producing  areas,  the assumed effects of regulations
by governmental  agencies, and assumptions concerning future oil and gas prices,
future  operating  costs,  severance  and excise  taxes,  development  costs and
workover and remedial costs, all which may in fact vary considerably from actual
results. For these reasons, estimates of the economically recoverable quantities
of  oil  and  gas   attributable   to  any   particular   group  of  properties,
classifications  of such reserves based on risk of recovery and estimates of the
future net cash flows expected therefrom  prepared by different  engineers or by
the  same  engineers.   at  different  times  may  vary  substantially.   Actual
production,  revenues and  expenditures  with respect to the Company's  reserves
will likely vary from estimates, and such variances may be material.

RISK OF EXPLORATORY DRILLING ACTIVITIES

           The  success of the Company  will be  materially  dependent  upon the
continued  success of its exploratory  drilling  program.  Exploratory  drilling
involves numerous risks, including the risk that no commercially  productive oil
or natural gas reservoirs will be encountered. The cost of drilling,  completing
and  operating  wells  is  often  uncertain,  and  drilling  operations  may  be
curtailed,  delayed or cancelled as a result of a variety of factors,  including
unexpected  drilling  conditions,  pressure  or  irregularities  in  formations,
equipment  failures or accidents,  adverse weather  conditions,  compliance with
governmental  requirements  and  shortages  or  delays  in the  availability  of
drilling  rigs or delivery  crews and the  delivery of  equipment.  Although the
Company believes that its use of 3-D seismic data and other advanced  technology
should  increase the  probability  of success of its  exploratory  wells through
elimination of prospects that might  otherwise be drilled solely on the basis of
2-D seismic data and other traditional  methods,  exploratory drilling remains a
speculative  activity.  Even when fully utilized and properly  interpreted,  3-D
seismic data and advanced  techniques only assist  geoscientists  in identifying
subsurface  structures and do not allow the  interpreter to know if hydrocarbons
will in fact be present in such structures if they are drilled. In addition, the
use of 3-D seismic  data and such  technologies  requires  greater  pre-drilling
expenditures  than traditional  drilling  strategies and the Company could incur
losses  as  a  result  of  such  expenditures.  The  Company's  future  drilling
activities may not be successful and, if unsuccessful, such failure will have an
adverse  effect on the  Company's  future  results of  operations  and financial
condition. There can be no assurance that the Company's overall drilling success
rate or its drilling success rate for activity within a particular  project area
will not decline.  Although the Company has  identified or budgeted for numerous
drilling prospects, there can be no assurance that such prospects will be leased
or drilled  (or drilled  within the  scheduled  or budgeted  time frame) or that
natural gas or oil will be produced  from any such  identified  prospects or any
other  prospects.  Prospects  may  initially be  identified  through a number of
methods,  some of which do not include  interpretation  of 3-D or other  seismic
data.

COMPETITION

           The  exploration  for  and  production  of oil  and  gas  are  highly
competitive.  Many  companies  and  individuals  are engaged in the  business of
acquiring  interests  in and  developing  onshore  and near  onshore oil and gas
properties  in the United  States.  The industry is not  dominated by any single
competitor or a small number of competitors.  The Company  competes with a large
number of technology-driven  major and independent oil and gas companies for the
acquisition  of desirable oil and gas  properties,  as well as for the equipment
and  expertise  required to operate and develop such  properties.  Many of these

                                       7

<PAGE>


competitors have financial and other resources  substantially in excess of those
available to the Company. Such competitive  disadvantages could adversely affect
the Company's ability to participate in projects with favorable rates of return.

TECHNOLOGICAL CHANGES

           The oil and gas industry is  characterized  by rapid and  significant
technological  advancements  and  introductions  of new  products  and  services
utilizing new  technologies.  As new  technologies  develop,  the Company may be
placed at a competitive  disadvantage,  and competitive  pressures may force the
Company to implement such new technologies at substantial  cost. There can be no
assurance that the Company will be able to respond to such competitive pressures
and implement such  technologies on a timely basis or at an acceptable cost. One
or more of the technologies  currently utilized by the Company or implemented in
the future may become obsolete. In such case, the Company's business,  financial
condition and results of operations could be materially  adversely affected.  If
the  Company  is unable to  utilize  the most  advanced  commercially  available
technology,   the  Company's  business,   financial  condition  and  results  of
operations could be materially and adversely affected.

OPERATING RISKS OF OIL AND NATURAL GAS OPERATIONS

      The oil and natural gas business  involves certain  operating hazards such
as well blowouts, craterings,  explosions,  uncontrollable flows of oil, natural
gas or well  fluids,  fires,  formations  with  abnormal  pressures,  pollution,
releases of toxic gas and other  environmental  hazards and risks,  any of which
could  result  in  substantial  losses to the  Company.  In  addition,  offshore
projects are subject to the  additional  hazards of marine  operations,  such as
capsizing, collision and damage or loss from severe weather. The availability of
a ready market for the Company's oil and natural gas production  also depends on
the proximity of reserves to, and the capacity of, oil and natural gas gathering
systems, pipelines and trucking or terminal facilities. In addition, the Company
may be liable for  environmental  damages caused by previous  owners of property
purchased and leased by the Company.  As a result,  substantial  liabilities  to
third  parties or  governmental  entities may be incurred,  the payment of which
could reduce or eliminate the funds  available for  exploration,  development or
acquisitions  or result in the loss of the Company's  properties.  In accordance
with customary industry practices, the Company maintains insurance against some,
but not all,  of such risks and  losses.  The  occurrence  of an event not fully
covered  by  insurance  could have a material  adverse  effect on the  financial
condition and results of operations of the Company.

GOVERNMENT REGULATION AND ENVIRONMENTAL MATTERS

      Oil and natural gas operations are subject to various  federal,  state and
local government regulations, which may be changed from time to time in response
to economic or  political  conditions.  Matters  subject to  regulation  include
discharge permits for drilling  operations,  drilling bonds,  reports concerning
operations,  the spacing of wells,  unitization  and pooling of  properties  and
taxation. From time to time, regulatory agencies have imposed price controls and
limitations  on  production by  restricting  the rate of flow of oil and natural
gas. In addition, the development, production, handling, storage, transportation
and disposal of oil and natural gas,  by-products  thereof and other  substances
and materials produced or used in connection with oil and natural gas operations
are subject to regulation  under federal,  state and local laws and  regulations
primarily  relating  to  protection  of human  health and the  environment.  The
Company is also subject to changing and extensive tax laws, the effects of which
cannot be predicted. The implementation of new, or the modification of existing,
laws or regulations could have a material adverse effect on the Company.


                                      8

<PAGE>


VARIABILITY OF OPERATING RESULTS

           The  Company's  operating  results  have in the  past  and may in the
future  fluctuate  significantly  depending  upon a number of factors  including
industry conditions,  prices of oil and gas, rate of drilling success,  rates of
production  from completed  wells and the timing of capital  expenditures.  Such
variability  could have a material  adverse  effect on the  Company's  business,
financial condition and results of operations. In addition, any failure or delay
in the realization of expected cash flows from operating  activities could limit
the  Company's  ability to invest and  participate  in  economically  attractive
projects.

DEPENDENCE ON KEY PERSONNEL

           The Company has  assembled a team of  geologists,  geophysicists  and
engineers  who have  considerable  experience  effectively  applying 3-D imaging
technologies. The Company is dependent upon the knowledge, skills and experience
of these  experts to provide 3-D imaging and assist the Company in reducing  the
risks associated with its participation in oil and gas exploration  projects. In
addition,  the success of the  Company's  business also depends to a significant
extent upon the abilities and continued efforts of its management,  particularly
Ronald P. Nowak,  the  Company's  President  and Chief  Executive  Officer.  The
Company does not have employment agreements with any of its employees except Mr.
Nowak,  which provides for an employment term of two years ending February 2000.
The loss of the services of key management  personnel or the Company's technical
experts, or the inability to attract additional qualified personnel,  could have
a  material  adverse  effect on the  Company's  business,  financial  condition,
results of operations,  development efforts and ability to expand.  There can be
no assurance  that the Company will be successful  in  attracting  and retaining
such executives, geoscientists and engineers.

POSSIBLE VOLATILITY OF STOCK PRICE

           The market price of the Common Stock could be subject to  significant
fluctuations in response to various factors and events,  including the liquidity
of the  market for the  Common  Stock,  variations  in the  Company's  quarterly
operating  results,  regulatory  or other  changes  in the oil and gas  industry
generally,  announcements  of  business  developments  by  the  Company  or  its
competitors,   changes  in  operating   costs  and  changes  in  general  market
conditions. See "-Variability of Operating Results."

ANTI-TAKEOVER CONSIDERATIONS

         The Company's  Restated  Certificate of Incorporation (the "Certificate
of  Incorporation")  and Amended and  Restated  By-laws (the  "Bylaws")  include
certain provisions that are intended to enhance the likelihood of continuity and
stability  in the  composition  of  the  Company's  Board  of  Directors.  These
provisions  may have the effect of delaying,  deterring  or  preventing a future
takeover or change in control of the Company  unless such  takeover or change in
control is  approved by the  Company's  Board of  Directors,  even though such a
transaction  may offer the holders of Common Stock the opportunity to sell their
stock at a price above the  prevailing  market price.  Such  provisions may also
render the removal of directors and management more difficult. Specifically, the
Certificate of Incorporation  and Bylaws,  as the case may be, have been amended
to provide for a classified  Board of Directors  serving  staggered,  three-year
terms and certain advance notice  requirements  for  stockholder  nominations of
candidates  for election to the  Company's  Board of Directors and certain other
stockholder  proposals.  Such  provisions  could  limit the price  that  certain
persons  might be willing to pay in the  future for shares of Common  Stock.  In
addition,  prior to completion of the Offering, the Certificate of Incorporation
was amended and restated to  authorize  the Board of Directors of the Company to
issue from time to time,  without any further action of stockholders,  up to one
million shares of Preferred  Stock (as defined  herein),  on such terms and with
such  rights,  designations,   preferences,   qualifications,   limitations  and
restrictions  as the Board of  Directors  may  determine.  The  issuance of such
Preferred  Stock,   depending  upon  the  rights,   designations,   preferences,
qualifications,  limitations and  restrictions  thereof,  may have the effect of
delaying,  deterring  or  preventing  a change in control of the  Company or may
otherwise  adversely  affect

                                       9

<PAGE>

the interests of holders of Common  Stock.  Further,  certain  provisions of the
Delaware General Corporation Law (the "DGCL") prevent certain  stockholders from
engaging  in  business  combinations  with  the  Company,   subject  to  certain
exceptions.  See "Description of Capital Stock-Preferred Stock," "Description of
Capital Stock-Certain Provisions of the Certificate of Incorporation and Bylaws"
and "Description of Capital Stock-Delaware Anti-Takeover Law."

                              SELLING STOCKHOLDERS

              The following  table sets forth,  to the knowledge of the Company,
the  number  of shares of Common  Stock and the  percentage  of the  outstanding
shares of Common Stock beneficially owned by each Selling  Stockholder,  and the
number of Shares to be offered  and sold by such  Selling  Stockholder,  and the
number of shares and percentage of outstanding  shares to be beneficially  owned
by such Selling  Stockholder after such offering and sale, assuming that all the
shares offered by such Selling  Stockholder are in fact sold.  Unless  otherwise
indicated,  each  person has sole  investment  and voting  power (or shares such
powers  with his or her  spouse)  with  respect  to the  shares set forth in the
following  table.  As of September __, 1998 the Company had _________  shares of
Common Stock issued and outstanding.


<TABLE>
<CAPTION>

                                            Beneficial Ownership                              Beneficial Ownership
                                            Prior to the Offering                              After the Offering
                                     ------------------------------------                 ------------------------------
<S>                                     <C>              <C>                <C>             <C>             <C>    
                                         Shares of                          Shares to        Shares of
                                        Common Stock     Percentage (1)      be Sold        Common Stock    Percentage
                                        ------------     --------------     ---------       ------------    ----------




</TABLE>


              Each of  ______________  was  employed  by the  Company in various
positions  during the past three years.  None of the other Selling  Stockholders
who is an individual is currently employed by the Company.

              The Selling Stockholders  acquired their Shares pursuant to one or
more of (i) a Stock Purchase  Agreement dated as of November 3, 1993 between the
Company  and  certain  investors,  (ii) a  Series  C  Preferred  Stock  Purchase
Agreement  dated as of July 26, 1995  between the Company and certain  investors
and (iii) a Common Stock  Subscription  Agreement dated June 3, 1998 between the
Company and certain  investors,  or as permitted  transferees  of persons who so
acquired such Shares. Pursuant to the Common Stock Subscription  Agreement,  the
Company agreed to effect the registration of the offering and sale of the Shares
issued  thereunder on a delayed or continuous  basis under the Securities Act on
certain  terms and  conditions.  The  Stockholders  Agreement  and the  Series C
Preferred  Stock  Purchase   Agreement   provide  for   "piggy-back"  and  other
registration rights on certain terms and conditions.


                                       10


<PAGE>

                              PLAN OF DISTRIBUTION

              The  Shares  may be  offered  and sold from time to time by one or
more of the Selling Stockholders,  or by pledgees,  donees, transferees or other
successors in interest.  No Selling Stockholder is required to offer or sell any
of his or its Shares.  The Selling  Stockholders  anticipate  that,  if and when
offered and sold, the Shares will be offered and sold in transactions (which may
include  block  transactions)  effected  on the Nasdaq  National  Market at then
prevailing market prices. The Selling Stockholders  reserve the right,  however,
to offer and sell the Shares on any other national  securities exchange on which
the Common Stock is or may become listed or in the  over-the-counter  market, in
each  case  at  then  prevailing  market  prices,  or  in  privately  negotiated
transactions each at a price then to be negotiated. All offers and sales made on
the Nasdaq National Market or any other national  securities  exchange or in the
over-the-counter market will be made through or to licensed brokers and dealers.
No agreements,  arrangements or  understandings  have been entered into with any
broker or dealer,  and no brokers or dealers have been  selected,  in connection
with the  offer  and sale of the  Shares.  No  discounts,  commissions  or other
compensation will be allowed or paid by the Selling  Stockholders or the Company
in  connection  with the offer and sale of the  Shares,  except  that  usual and
customary  brokers'  commissions  may be paid by the Selling  Stockholders.  All
proceeds  from the  sale of the  Shares  will be paid  directly  to the  Selling
Stockholders  and will not be  deposited  in an escrow,  trust or other  similar
arrangement.

              The  selling  broker may act as agent or may acquire the Shares or
interests  therein as  principal or pledgee and may,  from time to time,  effect
distributions of the Shares or interests. If a dealer is utilized in the sale of
the  Shares in  respect  of which  the  Prospectus  is  delivered,  the  Selling
Stockholders  will sell the Shares to the dealer,  as principal.  The dealer may
then resell the Shares to the public at varying  prices to be determined by such
dealer at the time of resale.

              The Company has agreed to indemnify the Selling  Stockholders  and
the Selling  Stockholders  have agreed to indemnify  the Company,  its officers,
directors,  employees,  agents and  controlling  persons from certain damages or
liabilities  arising out of or based upon any untrue statement or alleged untrue
statement of any  material  fact  contained  in or material  omission or alleged
omission from the  Registration  Statement,  any  preliminary,  final or summary
prospectus  contained therein,  or any amendment or supplement  thereto,  to the
extent such untrue statement or omission was made in the Registration  Statement
or other  document in reliance upon  information  furnished by the  indemnifying
party.

              The legal,  accounting and other fees and expenses  related to the
offer  and  sale  of  the  Shares   contemplated  hereby  are  estimated  to  be
$_____________  and  will be paid  by the  Company.  The  Company  will  pay all
expenses  incurred  in  connection  with this  offering,  excluding  commissions
charged by any broker or dealer acting on behalf of a Selling Stockholder.

                                     EXPERTS

               The audited  financial  statements  incorporated  by reference in
this prospectus and elsewhere in the registration statement have been audited by
Arthur  Andersen  LLP,  independent  public  accountants,  as indicated in their
reports  with respect  thereto,  and are  included  herein in reliance  upon the
authority of said firm as experts in giving said  reports.  Reference is made to
said report  included in the Company's Form 8-K dated  September 9, 1998,  which
contains an  explanatory  fourth  paragraph  with  respect to the  existence  of
substantial doubt about the Company's ability to continue as a going concern, as
described more fully in Note 11 to the financial statements.

             

           The reports of independent  petroleum  engineers,  dated December 31,
1997 and  June  30,  1998  incorporated  by  reference  in this  Prospectus  and
elsewhere in this registration statement are incorporated by reference herein in
reliance upon the authority of said firm as experts in giving said reports.

                                       11

<PAGE>


                                  LEGAL MATTERS

              Certain  legal  matters in  connection  with the  legality  of the
securities offered hereby have been passed upon for the Company by Kelley Drye &
Warren LLP, 101 Park Avenue,  New York, New York 10178,  and Two Stamford Plaza,
281 Tresser Boulevard, Stamford, Connecticut 06901.

                                    * * * * *


                                       12

<PAGE>


<TABLE>
<CAPTION>



<S>                                                                 <C>    
No   dealer,  salesperson   or  other  person  has  been
authorized  to  give  any  information  or  to  make any 
representation  not  contained  in this Prospectus, and,
if  given  or  made, such information or  representation
must  not  be  relied upon as having been authorized  by
the Company.  This  Prospectus  does  not  constitute an
offer  to  sell  or  a  solicitation  of an offer to buy             3DX TECHNOLOGIES INC.
any of the securities offered hereby in any jurisdiction
to  any  person  to  whom  it is  unlawful  to make such
offer in such jurisdiction. Neither the delivery of this
Prospectus nor any sale made  hereunder shall, under any
circumstances,  create  any  implication  that there has
been   no change in the  affairs  of the  Company  since
the date hereof  or  that  the   information   contained
herein is correct as of any time subsequent to its date.                   [      ]
                                                                            Shares

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



                                                                          Common Stock
                                                                        ($.01 par value)

                    TABLE OF CONTENTS

                                                      Page

Available Information..............................
Incorporation of Certain Documents                                      ________________
     by Reference..................................
Special Note Regarding Forward-Looking                                      PROSPECTUS
     Information...................................                     ________________
The Company........................................
Risk Factors.......................................
Selling Stockholders...............................
Plan of Distribution...............................
Experts............................................
Legal Matters......................................

</TABLE>

<PAGE>



                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

<TABLE>
<CAPTION>
                                                                                       Amount To
                  Type or Nature of Expense                                             be paid
                  -------------------------                                            ---------

         <S>                                                                           <C>
         SEC registration fee......................................................    $ 516.87
         Accounting fees and expenses*.............................................
         Legal fees and expenses*..................................................
         Miscellaneous* . .........................................................     --------
         Total*            ........................................................    $
                                                                                       ========= 
</TABLE>

- ----------------------
*To be filed by Amendment.


ITEM 15.  INDEMNIFICATION OF OFFICERS AND DIRECTORS

              Section 145 of the Delaware  General  Corporation Law (the "DGCL")
provides  that a Delaware  corporation  may indemnify any person who was or is a
party  or is  threatened  to be  made a  party  to any  threatened,  pending  or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (a  "proceeding")  (other than an action by or in the right of the
corporation)  by  reason  of the  fact  that he is or was a  director,  officer,
employee or agent of the corporation, or is or was serving at the request of the
corporation as a director,  officer,  employee or agent of another  corporation,
partnership,   joint  venture,  trust  or  other  enterprise,  against  expenses
(including  attorneys'  fees),  judgments,  fines and amounts paid in settlement
actually and reasonably  incurred by him in connection with such actin,  suit or
proceeding if he acted in good faith and in a manner he  reasonably  believed to
be in or not opposed to the best interests of the corporation, and, with respect
to any criminal  action or  proceeding,  had no reasonable  cause to believe his
conduct was unlawful. A Delaware corporation may indemnify any person under such
Section in connection with a proceeding by or in the right of the corporation to
procure  judgment in its favor, as provided in the preceding  sentence,  against
expenses (including  attorneys' fees) actually and reasonably incurred by him in
connection  with the  defense  or  settlement  of such  action,  except  that no
indemnification  shall be made in respect thereof  unless,  and then only to the
extent that, a court of competent  jurisdiction shall determine upon application
that  such  person is fairly  and  reasonably  entitled  to  indemnity  for such
expenses as the court shall deem proper.  A Delaware  corporation must indemnify
any  person who was  successful  on the  merits or  otherwise  in defense of any
action,  suit or proceeding  or in defense of any claim,  issue or matter in any
proceeding,  by  reason  of the  fact  that  he is or was a  director,  officer,
employee or agent of the  corporation or is or was serving at the request of the
corporation,   against  expenses   (including   attorneys'  fees)  actually  and
reasonably incurred by him in connection  therewith.  A Delaware corporation may
pay for the  expenses  (including  attorneys'  fees)  incurred  by an officer or
director in defending a proceeding in advance of the final  disposition to repay
such amount if it shall  ultimately be determined  that he is not entitled to be
indemnified by the corporation.

              Section  102(b)(7) of the DGCL permits a corporation to provide in
its certificate of incorporation  that a director shall not be personally liable
to the  corporation  or its  stockholders  for monetary  damages for a breach of
fiduciary  duty as a director,  except for  liability  (i) for any breach of the
director's duty of loyalty to the corporation or its stockholders,  (ii) for any
acts or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) in respect of certain unlawful dividend payments
or stock redemptions or repurchases,  or (iv) for any transaction from which the
director derived an improper  personal  benefit.  Article Ninth of the Company's
Certificate  of 

                                      II-1

<PAGE>

Incorporation  eliminates  the  liability  of  directors  to the fullest  extent
permitted  by Section  102(b)(7)  of the DGCL.  The DGCL permits the purchase of
insurance on behalf of directors  and officers  against any  liability  asserted
against directors and officers and incurred by such persons in such capacity, or
arising out of their status as such,  whether or not the corporation  would have
the power to indemnify  directors  and  officers  against  such  liability.  The
Company has acquired officers' and directors'  liability insurance of $5 million
for members of its Board of Directors and executive officers.  In addition,  the
Company has entered into agreements to indemnify its directors and officers.

              At present,  there is no pending  litigation  or other  proceeding
involving a director or officer of the  Company as to which  indemnification  is
being sought,  nor is the Company aware of any  threatened  litigation  that may
result in claims for indemnification by any officer or director.

              Article   Seventh  of  the  Company's   Restated   Certificate  of
Incorporation  and Section 5 of Article V of the Company's  By-laws  provide for
indemnification  of directors  and officers to the fullest  extent  permitted by
Section 145 of the DGCL.

                                      II-2

<PAGE>



Item 16.  Exhibits

         (a)      The  exhibits  listed  below  have  been filed as part of this
                  Registration Statement.


         Exhibit No.                   Description of Exhibit
         -----------                   ----------------------

         3.1      -     Sixth Restated Certificate of Incorporation.(1)

         4.1      -     Specimen  common stock certificate of the Registrant.(1)

         4.2      -     Stock  Purchase   Agreement among the Company, C. Eugene
                        Ennis,  Douglas  C.  Nester,   Peter  M. Duncan  and the
                        Investors named therein dated November 9, 1993. (1)

         4.3      -     Series  C  Stock  Purchase Agreement among the  Company,
                        C. Eugene Ennis, Douglas C. Nester, Peter M. Duncan  and
                        the Investors named therein dated July 26, 1995. (1)

         4.4      -     Common Stock Subscription Agreement dated as  of June 3,
                        1998 by and among the  Company and the purchasers named
                        therein. (2)

         5.1      -     Opinion of Kelley Drye & Warren LLP regarding legality.*

         23.1     -     Consent  of  Kelley  Drye  &  Warren  LLP  (included  in
                        Exhibit 5.1).

         23.2     -     Consent of Arthur Andersen LLP.

         23.3     -     Consent of Ryder Scott Company.

         24.1     -     Powers  of  Attorney  executed by certain  officers  and
                        directors of the  Registrant  (See page II-4).


- -------------------
To be filed by Amendment.

(1)      Previously  filed  as  an  exhibit  to  the  Registrant's  Registration
         Statement  on  Form  S-1  (File  No. 333-14473) and incorporated herein
         by reference.

(2)      Previously  filed as an exhibit to the  Registrant's  Current Report on
         Form 8-K filed with the  Commission  on June 16, 1998 and  incorporated
         herein by reference.

ITEM 17.  UNDERTAKINGS

              Insofar  as  indemnification  for  liabilities  arising  under the
Securities Act may be permitted to directors,  officers and controlling  persons
of the Registrant  pursuant to the provisions  described under Item 15 above, or
otherwise, the Registrant has been advised that in the opinion of the Securities
and  Exchange  Commission,  such  indemnification  is against  public  policy as
expressed in the Securities Act and is, therefore,  unenforceable.  In the event
that a claim for indemnification for such liabilities (other than the payment by
the  Registrant  of  expenses  incurred  or  paid  by  a  director,  officer  or
controlling  person of the Registrant in the  successful  defense of any action,
suit or proceeding) is asserted by such director,  officer or controlling person
in connection with the securities being registered,  the Registrant will, unless
in the  opinion  of its  counsel  the matter  has been  settled  by  controlling
precedent,  submit to a court of appropriate  jurisdiction  the question whether
such  indemnification  by it is  against  public  policy  as  expressed  in  the
Securities Act and will be governed by the final adjudication of such issue.

                                      II-3

<PAGE>


              The undersigned Registrant hereby undertakes:

              (1) To file,  during any period in which offers or sales are being
made, a post-effective amendment to this Registration Statement to:

                  (a)  Include  any  prospectus  required by Section 10(a)(3) of
the Securities Act;

                  (b)  Reflect in the  prospectus  any  facts  or events arising
after  the  effective  date  of this Registration  Statement (or the most recent
post-effective  amendment  thereof)  which,  individually  or  in the aggregate,
represent a fundamental change in the information set forth in this Registration
Statement; and

                  (c)  Include  any  material information with  respect  to  the
plan  of  distribution  not previously  disclosed in this Registration Statement
or any material change to such information in this Registration Statement.

              (2) That, for the purpose of determining  any liability  under the
Securities Act, each such  post-effective  amendment shall be deemed to be a new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

              (3) To  remove  from  registration  by means  of a  post-effective
amendment  any of the  securities  being  registered  which remain unsold at the
termination of the offering.

              The undersigned Registrant hereby undertakes that, for purposes of
determining  any  liability  under  the  Securities  Act,  each  filing  of  the
Registrant's  annual  report  pursuant to section  13(a) or section 15(d) of the
Securities  Exchange  Act of 1934  (and,  where  applicable,  each  filing of an
employee  benefit  plan's  annual  report  pursuant  to  section  15(d)  of  the
Securities  Exchange  Act of 1934) that is  incorporated  by  reference  in this
Registration  Statement  shall  be  deemed  to be a new  registration  statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

                                      II-4

<PAGE>


                                   SIGNATURES

              Pursuant  to  the  requirements  of  Section  13 or  15(d)  of the
Securities  Exchange Act of 1933, as amended,  the Registrant  certifies that it
has  reasonable  ground to  believe  that it meets all of the  requirements  for
filing on Form S-3 and has duly caused this Registration  Statement to be signed
on its  behalf by the  undersigned,  thereunto  duly  authorized  in the City of
Houston, State of Texas, on September 9, 1998.

                                    3DX TECHNOLOGIES INC.


                                    By: /S/ Ronald P. Nowak            
                                        Ronald P. Nowak
                                        Chief Executive Officer

              KNOW  ALL  MEN BY  THESE  PRESENTS,  that  each  individual  whose
signature  appears  below hereby  constitutes  and appoints  Ronald P. Nowak and
Russell  L.  Allen,  and each of them,  his true and  lawful  agent,  proxy  and
attorney-in-fact,  with full power of substitution and  resubstitution,  for him
and in his name, place and stead, in any and all capacities, to (i) act on, sign
and file with the  Securities  and Exchange  Commission  any and all  amendments
(including  post-effective  amendments) to this Registration  Statement together
with  all  schedules  and  exhibits  thereto,  (ii) act on,  sign and file  such
certificates, instruments, agreements and other documents as may be necessary or
appropriate in connection therewith, (iii) act on and file any supplement to any
prospectus  included in this Registration  Statement or any such amendment,  and
(iv)  take  any and  all  actions  which  may be  necessary  or  appropriate  in
connection therewith,  granting unto such agents, proxies and attorneys-in-fact,
and each of them,  full power and authority to do and perform each and every act
and thing  necessary  or  appropriate  to be done,  as fully for all intents and
purposes  as he might or could do in person,  hereby  approving,  ratifying  and
confirming all that such agents, proxies and  attorneys-in-fact,  any of them or
any of his or their  substitute  or  substitutes  may lawfully do or cause to be
done by virtue hereof.

               Pursuant to the  requirements  of the  Securities Act of 1933, as
amended, this Registration Statement has been signed by the following persons on
behalf of the Company and in the capacities and on the dates indicated.

<TABLE>
<CAPTION>

          Signatures                              Title or Capacities                        Date
          ----------                              -------------------                        ----


<S>                                          <C>                                            <C> 
/s/ C. Eugene Ennis                          Chairman of the Board                          September 9, 1998
C. Eugene Ennis


/s/ Ronald P. Nowak                          President and Chief Executive, and             September 9, 1998
Ronald P. Nowak                              Director (Principal Executive Officer)
                                             

/s/ Russell L. Allen                         Chief Financial Officer (Principal             September 9, 1998
Russell L. Allen                             Financial Officer)


/s/ Jon W. Bayless                           Director                                       September 9, 1998
Jon W. Bayless


/s/ Charles E. Edwards                       Director                                       September 9, 1998
Charles E. Edwards


                                      II-5

<PAGE>


/s/ C. D. Gray                               Director                                       September 9, 1998
C.D. Gray


/s/ Douglas C. Williamson                    Director                                       September 9, 1998
Douglas C. Williamson


/s/ Douglas C. Nester                        Director                                       September 9, 1998
Douglas C. Nester

</TABLE>

                                      II-6


<PAGE>



                                                 INDEX TO EXHIBITS
<TABLE>
<CAPTION>


Exhibit           Description of Exhibit                                                                     Page
- -------           ----------------------                                                                     ----

    <S>           <C>                                                                       
    3.1           Sixth and Restated Certificate of Incorporation, as amended.(1)

    4.1           Specimen common stock certificate of the Registrant.(1)

    4.2           Stock Purchase Agreement among the Company, C. Eugene Ennis,  Douglas C. Nester,  Peter
                  M. Duncan and the Investors named therein dated November 9, 1993. (1)

    4.3           Series C Stock  Purchase  Agreement  among the  Company,  C. Eugene  Ennis,  Douglas C.
                  Nester, Peter M. Duncan and the Investors named therein dated July 26, 1995. (1)

    4.4           Common Stock  Subscription  Agreement dated as of June 3, 1998 by and among the Company
                  and the purchasers named therein. (2)

    5.1           Opinion of Kelley Drye & Warren LLP  regarding  the  legality of the  securities  being
                  offered.*

    23.1          Consent of Kelley Drye & Warren LLP (included in Exhibit 5.1).

    23.2          Consent of Arthur Andersen LLP

    23.3          Consent of Ryder Scott.

    24.1          Powers of Attorney  executed by certain  officers and directors of the Registrant  (See
                  page II-4).

</TABLE>

- --------------------
*To be filed by Amendmemt.

(1)      Previously  filed  as  an  exhibit  to  the  Registrant's  Registration
         Statement on Form  S-1 (File  No. 333-14473) and incorporated herein by
         reference.

(2)      Previously  filed as an exhibit to the  Registrant's  Current Report on
         Form 8-K filed with the  Commission  on June 16, 1998 and  incorporated
         herein by reference.



<PAGE>



                                                                    EXHIBIT 23.2


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


         As independent public accountants,  we hereby consent to the use of our
reports  and to all  references  to our Firm  included in or made a part of this
registration statement.


                                                     ARTHUR ANDERSEN LLP


September 9, 1998
Houston, Texas


                                                         EXHIBIT 23.3


                   CONSENT OF INDEPENDENT PETROLEUM ENGINEERS


         We hereby consent to (a) the use of our name and references to our Firm
in this Registration Statement on Form S-3 for 3DX Technologies Inc. and (b) the
incorporation  by reference in this  Registration  on Form S-3 of all reports of
our Firm included in or made part of this Registration Statement on Form S-3 for
3DX Technologies Inc.


                                                     RYDER SCOTT COMPANY
                                                     PETROLEUM ENGINEERS


Houston, Texas
September 9, 1998






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