SEITEL INC
10-Q, 1995-05-15
OIL & GAS FIELD EXPLORATION SERVICES
Previous: SELIGMAN FRONTIER FUND INC, N-30D, 1995-05-15
Next: COMMUNITY BANCSHARES INC /DE/, 10-Q, 1995-05-15








                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549
                                   FORM 10-Q

[X]      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
         EXCHANGE ACT OF 1934

         For the quarterly period ended March 31, 1995
                                        --------------
                                    OR

[ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 
         EXCHANGE ACT OF 1934

          For the transition period to          to          .
                                      ---------   ----------
Commission File Number 0-14488

                                  Seitel, Inc.
                                ---------------
               (Exact name of registrant as specified in charter)

         Delaware                                      76-0025431
- -------------------------------                 ----------------------
(State or other jurisdiction of                     (IRS Employer 
 incorporation or organization)                 Identification Number)

50 Briar Hollow Lane
West Building, 7th Floor
Houston, Texas                                      77027
- ----------------------------------------         ----------
(Address of principal executive offices)         (Zip Code)
offices)

                                 (713) 627-1990
              ----------------------------------------------------
              (Registrant's telephone number, including area code)

                                 Not Applicable
              ----------------------------------------------------
              Former name, former address and former fiscal year,
                         if changed since last report.

     Indicate  by check  mark  whether  the  registrant  (1) has  filed all
     reports  required to be filed by Section 13 or 15(d) of the Securities
     Exchange  Act of 1934  during  the  preceding  12 months  (or for such
     shorter period that the registrant was required to file such reports),
     and (2) has been subject to such filing  requirements  for the past 90
     days.

                             Yes  X                    No
                                 ---                      ---
     As of May 10, 1995 there were 9,164,979 shares of the Company's common
     stock, par value $.01 per share, outstanding.




<PAGE>



                                     INDEX



PART I.   FINANCIAL INFORMATION                                        Page

          Item 1.  Financial Statements

          Consolidated Balance Sheets as of
          March 31, 1995 and December 31, 1994....................      3

          Consolidated Statements of Operations
          for the Three Months Ended March 31, 1995
          and 1994................................................      4

          Consolidated Statements of Stockholders'
          Equity for the Three Months Ended
          March 31, 1995..........................................      5

          Consolidated Statements of Cash Flows
          for the Three Months Ended March 31, 1995
          and 1994................................................      6

          Notes to Consolidated Interim
          Financial Statements....................................      7

          Item 2.  Management's Discussion and
          Analysis of Financial Condition and
          Results of Operations Operations........................      8

PART II.  OTHER INFORMATION.......................................      10



                                  Page 2 of 12

<PAGE>


SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
(In thousands, except share and per share amounts)     
<TABLE>
<CAPTION>
                                                                  (Unaudited)
                                                                    March 31,          December 31,
                                                                      1995                 1994
                                                                  -----------          -----------
<S>                                                               <C>                  <C>
ASSETS
  Cash and equivalents                                            $     3,661          $    1,541
  Receivables
    Trade                                                              33,330              37,098
    Notes and other                                                       575                 329
  Net data bank                                                        99,585              95,801
  Net oil and gas properties                                           28,277              21,389
  Net geophysical and other property and equipment                     10,620              11,067
  Prepaid expenses, deferred charges and other assets                   1,592               1,546
                                                                   ----------          ----------
  TOTAL ASSETS                                                     $  177,640          $  168,771
                                                                   ==========          ==========
                                                                   

LIABILITIES AND STOCKHOLDERS' EQUITY
  Accounts payable and accrued liabilities                         $   36,098          $   32,649
  Income taxes payable                                                    593                 933
  Bank debt
    Line of Credit                                                      9,871               5,085
    Term Loan                                                           3,033               3,231
  Obligations under capital leases                                      4,696               5,088
  Subordinated debentures                                               2,079               3,523
  Deferred contractor payable                                           6,633               9,698
  Contingent payables                                                   3,152               3,152
  Deferred income taxes                                                 4,375               3,502
  Deferred revenue                                                        495                 581
                                                                   ----------          ----------
TOTAL LIABILITIES                                                      71,025              67,442
                                                                   ----------          ----------

CONTINGENCIES AND COMMITMENTS

STOCKHOLDERS' EQUITY
  Preferred stock, par value $.01 per share; authorized
    5,000,000 shares; none issued                                           -                   -
  Common stock, par value $.01 per share; authorized
    20,000,000 shares; issued and outstanding 9,048,015 and
    8,825,619 at March 31, 1995 and December 31, 1994
    respectively                                                           90                  88
  Additional paid-in capital                                           77,921              75,611
  Retained earnings                                                    30,231              27,257
  Treasury stock, 414 shares at cost at March 31, 1995 and
    December 31, 1994                                                      (4)                 (4)
  Notes receivable from officers and employees                         (1,551)             (1,551)
  Cumulative translation adjustment                                       (72)                (72)
                                                                   ----------         -----------
TOTAL STOCKHOLDERS' EQUITY                                            106,615             101,329
                                                                   ----------         -----------

TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                         $  177,640         $   168,771
                                                                   ==========         ===========
</TABLE>

                  The accompanying notes are an integral
                   part of these consolidated financial
                                statements.

                                  Page 3 of 12

<PAGE>


SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)
(In thousands, except per share amounts)
<TABLE>
<CAPTION>

                                                                    Three Months Ended March 31,
                                                                      1995                1994
                                                                   ----------         -----------
<S>                                                                <C>                <C>

REVENUE                                                            $   21,158         $    12,598


EXPENSES
  Depreciation, depletion and amortization                              7,276               5,318
  Cost of sales                                                         4,268               1,329
  Selling, general and administrative expenses                          4,081               2,649
  Net interest expense                                                    812                 768
                                                                   ----------         -----------
                                                                       16,437              10,064
                                                                   ----------         -----------

Income before provision for income taxes                                4,721               2,534

Provision for income taxes                                              1,747                 887
                                                                   ----------         -----------

NET INCOME                                                         $    2,974          $    1,647
                                                                   ==========         ===========

Earnings per share:
  Primary                                                          $      .31          $      .25
                                                                   ==========         ===========
  Assuming full dilution                                           $      .29          $      .22
                                                                   ==========         ===========

Weighted average number of common and common equivalent shares:
  Primary                                                               9,748               6,637
                                                                   ==========         ===========
  Assuming full dilution                                               10,176               8,165
                                                                   ==========         ===========


                  The accompanying notes are an integral
                   part of these consolidated financial
                                statements.


</TABLE>


                                  Page 4 of 12


<PAGE>



SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
(In thousands, except share amounts)
<TABLE>
<CAPTION>
                                                                                                               Notes
                                                                                                             Receivables
                                                  Common Stock     Additional               Treasury Stock     from      Cumulative
                                              ------------------    Paid-in    Retained   -----------------   Officers   Translation
                                               Shares    Amount     Capital    Earnings    Shares   Amount  & Employees  Adjustment
                                              --------- --------  ----------  ----------  -------- --------  ----------  ----------
<S>                                           <C>       <C>       <C>         <C>         <C>      <C>       <C>         <C>
BALANCE, DECEMBER 31, 1991                    5,438,250 $     55  $   22,555  $    8,741         - $      -  $        -  $        -

Proceeds from issuance of common stock           28,902        -         181           -         -        -           -           -
Sale of common stock through private offering   400,000        4       2,146           -         -        -      (2,150)          -
Cash dividends                                        -        -           -        (275)        -        -           -           -
Stock dividends                                 109,320        1         790        (791)        -        -           -           -
Foreign currency translation adjustment               -        -           -           -         -        -           -        (164)
Net income                                            -        -           -       4,550         -        -           -           -
                                              --------- --------  ----------  ----------  -------- --------  ----------  ----------
BALANCE, DECEMBER 31, 1992                    5,976,472       60      25,672      12,225         -        -      (2,150)       (164)

Proceeds from issuance of common stock           10,916        -          37           -         -        -           -           -
Payments received on notes receivable from
  officers and employees                              -        -           -           -      (414)      (4)        111           -
Foreign currency translation adjustment               -        -           -           -         -        -           -          79
Net income                                            -        -           -       5,717         -        -           -           -
                                              --------- --------  ----------  ----------  -------- --------  ----------  ----------

BALANCE, DECEMBER 31, 1993                    5,987,388       60      25,709      17,942      (414)      (4)     (2,039)        (85)

Sale of Common stock through public offering  1,061,200       11      31,906           -         -        -           -           -
Proceeds from issuance of common stock          770,364        7       7,280           -         -        -           -           -
Tax reduction from exercise of stock options          -        -       1,879           -         -        -           -           -
Conversions and exchanges of subordinated
  debentures                                  1,006,667       10       8,837           -         -        -           -           -
Payments received on notes receivable from
  officers and employees                              -        -           -           -         -        -         488           -
Foreign currency translation adjustment               -        -           -           -         -        -           -          13
Net income                                            -        -           -       9,315         -        -           -           -
                                              --------- --------  ----------  ----------  -------- --------  ----------  ----------

BALANCE, DECEMBER 31, 1994                    8,825,619       88      75,611      27,257      (414)      (4)     (1,551)        (72)

Proceeds from issuance of common stock           66,795        1         766           -         -        -           -           -
Tax reduction from exercise of stock options          -        -         212           -         -        -           -           -
Conversions and exchanges of subordinated
  debentures                                    155,601        1       1,332           -         -        -           -           -
Net income                                            -        -           -       2,974         -        -           -           -
                                              --------- --------  ----------  ----------  -------- --------  ----------  ----------
BALANCE MARCH 31, 1995 (Unaudited)            9,048,015 $     90  $   77,921  $   30,231      (414)$     (4) $   (1,551) $      (72)
                                              ========= ========  ==========  ==========  ======== ========  ==========  ========== 



</TABLE>

      The accompanying notes are an integral part these consolidated
                    financial statements.


                                  Page 5 of 12


<PAGE>


SEITEL, INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
(In thousands) 
<TABLE>
<CAPTION>
                                                                     Three Months Ended March 31,
                                                                      1995                1994
                                                                   ----------         -----------
<S>                                                                <C>                <C>
Cash flows from operating activities:
  Cash received from customers                                     $   24,094         $    15,240
  Cash paid to suppliers and employees                                 (9,810)             (6,803)
  Interest paid                                                          (308)               (951)
  Interest received                                                         6                   3
  Income taxes paid                                                    (1,002)               (220)
                                                                   ----------         -----------
    Net cash provided by operating activities                          12,980               7,269
                                                                   ----------         -----------

Cash flows from investing activities:
  Cash invested in seismic data                                       (12,931)            (11,372)
  Cash invested in oil and gas properties                              (2,586)             (2,114)
  Cash paid to acquire property and equipment                            (277)               (299)
                                                                   ----------         -----------
    Net cash used in investing activities                             (15,794)            (13,785)
                                                                   ----------         -----------

Cash flows from financing activities:
  Borrowings under line of credit agreements                           14,841              20,250
  Principal payments under line of credit                             (10,055)            (17,975)
  Principal payments on term loan                                        (198)               (186)
  Principal payments under capital lease obligations                     (402)                  -
  Proceeds from issuance of common stock                                  791               4,820
  Costs of debt and equity transactions                                   (43)                (30)
  Payments on receivables from officers and employees                       -                 137
  Other                                                                     -                  (1)
                                                                   ----------         -----------
    Net cash provided by financing activities                           4,934               7,015
                                                                   ----------         -----------

Net increase in cash and equivalents                                    2,120                 499
Cash and cash equivalents at beginning of period                        1,541               1,759
                                                                   ----------         -----------
Cash and equivalents at end of period                              $    3,661         $     2,258
                                                                   ==========         ===========
Reconciliation of net income to net cash provided by 
  operating activities:
Net income                                                         $    2,974         $     1,647
Adjustments to reconcile net income to net cash 
  provided by operating activities:
  Depreciation, depletion and amortization                              7,276               5,318
  Non-cash sales                                                         (500)                  -
  Decrease in receivables                                               3,522               2,811
  Increase in other assets                                               (197)               (355)
  Decrease in other liabilities                                           (95)             (2,152)
                                                                   ----------         -----------
    Total adjustments                                                  10,006               5,622
                                                                   ----------         -----------
Net cash provided by operating activities                          $   12,980         $     7,269
                                                                   ==========         ===========

</TABLE>


                  The accompanying notes are an integral part
                  of these consolidated financial statements.




                                  Page 6 of 12


<PAGE>


SEITEL, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED INTERIM FINANCIAL STATEMENTS (Unaudited)
March 31, 1995

NOTE A-BASIS OF PRESENTATION

   The  accompanying  unaudited  financial  statements  have  been  prepared  in
accordance with generally accepted  accounting  principles for interim financial
information and with the  instructions of Regulation S-X.  Accordingly,  they do
not include all of the  information  and notes  required by  generally  accepted
accounting  principles  for  complete  financial  statements.  In the opinion of
management, all adjustments (consisting of normal recurring accruals) considered
necessary for a fair presentation have been included.  Certain reclassifications
have been  made to the  amounts  in the prior  year's  financial  statements  to
conform to the  current  year's  presentation.  Operating  results for the three
months ended March 31, 1995 are not  necessarily  indicative of the results that
may be expected for the year ending December 31, 1995. For further  information,
refer to the financial  statements and notes thereto for the year ended December
31, 1994.


NOTE B-EARNINGS PER SHARE

         Earnings  per  share  is  based  on  the  weighted  average  number  of
outstanding  shares of common stock  during the  respective  periods,  including
common  equivalent  shares  applicable to assumed  exercise of stock options and
warrants  when such common stock  equivalents  are  dilutive,  and the Company's
other potentially dilutive securities.

         Earnings per share was  determined by dividing net income,  as adjusted
below, by applicable shares outstanding (in thousands):
<TABLE>
<CAPTION>

                                                                           Three Months Ended
                                                                               March 31,
                                                                   ------------------------------
                                                                      1995                1994
                                                                   ----------         -----------
<S>                                                                <C>                <C>        
Net income as reported                                             $    2,974         $     1,647
  Interest eliminated on assumed conversion of 9% convertible
    subordinated debentures, net of tax                                    25                 155
                                                                   ----------         -----------
Total income used for fully diluted earnings per share             $    2,999         $     1,802
                                                                   ==========         ===========

Weighted average number of common and common equivalent shares          9,748               6,637
                                                                   ==========         ===========
Weighted average number of common shares assuming full dilution        10,176               8,165
                                                                   ==========         ===========
</TABLE>

NOTE C-DATA BANK

         Costs  incurred  in  the  creation  of  proprietary  seismic  data  are
capitalized. Seismic data costs are amortized for each project in the proportion
that its revenue for a period relates to  management's  estimate of its ultimate
revenue.  Since inception,  management has established  guidelines regarding its
annual charge for amortization. Under these guidelines, 90% of the cost incurred
in the creation of  proprietary  seismic data is amortized  within five years of
inception,  and the final 10% is amortized on a straight-line basis over fifteen
years.  Costs of existing  seismic data  libraries  purchased by the Company are
fully amortized within ten years from date of purchase. On a periodic basis, the
carrying value of each seismic data program is compared to its estimated  future
revenue and, if appropriate, is reduced to its estimated net realizable value.

                                  Page 7 of 12

<PAGE>


NOTE D-SUPPLEMENTAL CASH FLOW INFORMATION

Significant non-cash investing and financing activities are as follows:

          1.   During the first three  months of 1995,  the Company  issued
               155,601  shares of its common stock upon the  conversion and
               exchange of  $1,444,000 of its 9%  convertible  subordinated
               debentures.   In  connection  with  these   conversions  and
               exchanges,  unamortized  bond issue costs  totaling  $92,000
               have been charged to additional paid-in capital.

          2.   During the first three months of 1995, the Company  licensed
               seismic data valued at $500,000 in exchange for the purchase
               of seismic data for its library.

          3.   During  the  first  three  months  of  1995,  capital  lease
               obligations  totaling $10,000 were incurred when the Company
               entered into leases for property and equipment.


Item 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
        AND RESULTS OF OPERATIONS
- -------------------------------------------------------------------------------

RESULTS OF OPERATIONS

         Total  revenue  increased  68%  during  the  first  quarter  of 1995 as
compared to the first  quarter of 1994.  Revenue  primarily  consists of revenue
generated  from  three  niche-energy  businesses  -  seismic,   exploration  and
production,  and gas marketing.  The majority of revenue in the first quarter of
1995 and 1994 relates to seismic revenue, increasing from $12,330,000 during the
first  quarter of 1994 to  $15,797,000  during the first  quarter of 1995.  This
increase is attributable to an increase in sales from both  two-dimensional (2D)
and  three-dimensional  (3D) seismic data. The balance of revenue relates to oil
and gas production, and gas marketing activities,  which increased from $268,000
in the first  quarter of 1994 to  $5,361,000 in the first quarter of 1995 due to
the increased volume of business in these areas.

         Depreciation,  depletion and  amortization  consists  primarily of data
bank  amortization.  Refer  to  Note  C  for  a  description  of  the  Company's
amortization policy. Data bank amortization increased from $5,047,000 during the
first quarter of 1994 to $6,743,000  during the first quarter of 1995 due to the
corresponding  increase in revenue from  licensing  seismic data during the same
period.  As a  percentage  of revenue from  licensing  seismic  data,  data bank
amortization  was  44%  and  47%  for  the  first  quarter  of  1995  and  1994,
respectively.  The change in this  percentage  was  primarily  due to the mix of
sales of 2D and 3D data  amortized  at  varying  percentages  based on each data
program's current and expected future revenue stream.

         Cost of sales consists of expenses  associated  with the acquisition of
seismic data for non-affiliated  parties,  seismic resale support services,  oil
and gas production,  and gas marketing activities. The increase in cost of sales
from  $1,329,000  for the  first  quarter  of 1994 to  $4,268,000  for the first
quarter of 1995, is due to the Company's  increasing volume of business in these
areas.  Revenues from these areas  increased  from  $1,494,000  during the first
quarter of 1994 to $5,545,000 during the first quarter of 1995.

         The Company's selling,  general and  administrative  expenses increased
during the 1995 period as compared to the 1994 period,  primarily as a result of
the addition of new  employees,  marketing  expenses and incentive  compensation
directly  related  to the  increased  volume of  business,  as well as  expenses
related  to the  Company's  expansions  in the  gas  marketing  and  oil and gas
exploration  and  production  areas.  As a percentage  of total  revenue,  these
expenses  have  decreased  from 21% for the first quarter of 1994 to 19% for the
first quarter of 1995.

                                  Page 8 of 12


<PAGE>


LIQUIDITY AND CAPITAL RESOURCES

         The  Company  filed a  registration  statement  on Form S-3 (the "Shelf
Registration  Statement") in June 1994 to offer from time to time in one or more
series (i) unsecured debt securities, which may be senior or subordinated,  (ii)
preferred  stock,  par value $0.01 per share,  and (iii) common stock, par value
$.01 per share,  or any  combination of the foregoing,  at an aggregate  initial
offering price not to exceed $75,000,000.  The Shelf Registration  Statement was
declared  effective by the Securities and Exchange  Commission on June 30, 1994.
On August 4, 1994, and August 18, 1994, the Company  completed a public offering
of 1,000,000 shares and 61,200 shares, respectively,  of its common stock priced
at $32 per share pursuant to the Shelf Registration Statement.  The net proceeds
from the offering (after underwriting  commission and offering expenses) totaled
$31,917,000.  After this sale of common stock at an initial  aggregate  offering
price of $33,958,400,  the Company may offer additional securities in the future
for up to an aggregate  initial  offering price of  $41,041,600  pursuant to the
Shelf Registration Statement.

         On May 4, 1995,  the Company  increased its revolving line of credit to
$25,000,000,  added a LIBOR interest rate option and extended the maturity.  The
increased  revolving line of credit bears interest at the prevailing  prime rate
or LIBOR plus 2%, is collateralized by both accounts  receivable and the seismic
data library and is available for general  corporate  purposes.  The Company may
borrow up to  $10,000,000  on the revolving line of credit based on seismic data
library   collateral  and  up  to  $25,000,000  based  on  accounts   receivable
collateral,  the total of which cannot exceed $25,000,000.  The banking facility
was  effective as of December 31,  1994,  and matures June 1, 1997.  The balance
outstanding on the revolving  line of credit  amounted to $11,071,000 at May 10,
1995, of which  $7,000,000 is borrowed at the LIBOR rate of 8.13% and $4,071,000
is borrowed at the prime rate. The banking  facility  imposes certain  financial
covenants  upon the Company which include  covenants  relating to leverage,  net
worth and working capital, as well as certain restrictions on dividends,  liens,
additional debt or lease obligations and the acquisition or disposition of major
assets.  Such covenants are not anticipated to restrict the Company's ability to
borrow funds under the facility.

         On February 21, 1995, DDD Energy,  Inc., ("DDD Energy"), a wholly-owned
subsidiary of the Company,  received a loan commitment from the Company's banks.
Under the terms of this  facility,  which is expected to close in May 1995,  DDD
Energy  will have a reducing  revolving  line of credit,  the amount of which is
determined by the banks' semi-annual review of DDD Energy's oil and gas reserves
securing  the  facility.  The master  note amount  pursuant  to the  facility is
$75,000,000,  but amounts  outstanding under the facility are limited to the oil
and gas reserve  borrowing  base, and are subject to interest,  at the Company's
option,  at either the  prevailing  prime  rate or LIBOR  plus 2%.  The  initial
borrowing  base,  which was determined  before 1994 year-end oil and gas reserve
information was available, amounts to $8,000,000, reducing by $175,000 per month
beginning  March 1, 1995.  Funds  available  under the facility  will be used to
repay  advances from the Company and for reserve  acquisitions  and  development
drilling. The facility matures on June 1, 1997 and is guaranteed by the Company.

         On July 15, 1993, a wholly-owned  subsidiary of the Company  obtained a
$4,300,000,  five year term loan  bearing  interest at the rate of 7.61% for the
purchase  of a 3D  seismic  recording  system.  The  debt  is  secured  by  such
equipment.  Monthly principal and interest payments began on August 1, 1993. The
balance outstanding on the term loan at May 10, 1995, was $2,900,000.

         From  January  1, 1995  through  May 10,  1995,  the  Company  received
$2,140,000  from the exercise of common stock purchase warrants and options. In
connection  with the  exercises,  the Company  will also  receive  approximately
$957,000 in tax savings.

          In October  1994,  the Company  called for  redemption  of its 12-1/2%
subordinated  debentures,  thereby  eliminating future interest and sinking fund
payments.  The Company's 9% convertible  debentures,  amounting to $2,069,000 at
May 10, 1995, require semi-annual  interest payments (March 31 and September 30)
and,  beginning March 31, 1997, annual sinking fund payments equal to 10% of the
principal amount of the debentures then outstanding.

                                  Page 9 of 12

<PAGE>


         During 1994 and 1995,  the Company  entered into  capital  leases which
relate to the  purchase  of a 3D  seismic  recording  system  and  seismic  data
processing center.  These lease agreements are for terms of three to five years.
Monthly  principal  and interest  payments  total  approximately  $125,000.  The
balance  outstanding under these capital lease obligations was $4,565,000 at May
10, 1995.

         The Company  has  entered  into  payment  arrangements  with one of its
contractors for seismic  acquisition  services which require the Company to make
payments  only  when  sales  on  the  related   seismic  project  are  collected
(contingent payables), or allow the Company to make payments as sales of related
seismic projects are collected until July 1, 1996, at which time any outstanding
balance would be due (deferred  contractor  payable).  In connection  with these
arrangements, the Company had $4,169,000 in receivables at March 31, 1995, which
will be paid to the contractor upon  collection.  Accordingly,  the same amount,
$4,169,000,  was included in the Company's regular accounts payable. The Company
has a verbal  payment  arrangement  with the contractor on certain other seismic
acquisition  projects pursuant to which payments to the contractor are made only
when sales of the related  seismic  projects  are  collected.  At March 31, 1995
accounts  receivable  included  $852,000  dedicated to payment  pursuant to this
verbal arrangement, while regular accounts payable included the full balance due
the contractor of $8,885,000.  Amounts owed to this  contractor bear interest at
the prime rate or the prime rate plus 1%, except for  contingent  payables which
bear no interest. Management anticipates that sales from these projects will pay
in full the amounts owed to the contractor.

         During  the first  three  months of 1995,  cash from  operations,  bank
borrowings and proceeds from the exercise of common stock purchase  warrants and
options  funded the third party seismic data creation costs borne by the Company
and oil and gas exploration,  as well as taxes, interest expenses, cost of sales
and general and administrative  expenses. The Company believes its revenues from
operating  sources and  proceeds  from the  exercise of  warrants  and  options,
combined with its available lines of credit, should be sufficient to fund all of
its internal operations and related capital expenditures for 1995. To the extent
these sources are not  sufficient to cover the Company's  expenses,  it would be
necessary for the Company to arrange for  additional  debt or equity  financing.
There can be no assurance  that the Company would be able to accomplish any such
debt or equity financing on terms satisfactory to it.


                          PART II - OTHER INFORMATION


Items 1., 2., 3., 4., and 5. Not applicable.


Item 6.  Exhibits and Reports on Form 8-K

(a)      10.1     Master Revolving  Promissory Note effective December 31, 1994
                  between the Company, Seitel Data Corp. (Company's wholly-owned
                  subsidiary),  Seitel Geophysical, Inc. (Company's wholly-owned
                  subsidiary),  Seitel  Offshore Corp.  (Company's  wholly-owned
                  subsidiary)   and   Exsol,   Inc.   (Company's    wholly-owned
                  subsidiary) and Compass Bank-Houston

         10.2     Master Revolving  Promissory Note effective  December 31, 1994
                  between the Company, Seitel Data Corp. (Company's wholly-owned
                  subsidiary),  Seitel Geophysical, Inc. (Company's wholly-owned
                  subsidiary),  Seitel  Offshore Corp.  (Company's  wholly-owned
                  subsidiary)   and   Exsol,   Inc.   (Company's    wholly-owned
                  subsidiary) and Bank One, Texas, N.A.

         10.3     Restated Revolving Credit and Security Agreement  effective as
                  of  December  31,  1994 among the  Company,  Seitel Data Corp.
                  (Company's wholly-owned subsidiary),  Seitel Geophysical, Inc.
                  (Company's  wholly-owned  subsidiary),  Seitel  Offshore Corp.
                  (Company's wholly-owned subsidiary) and Exsol, Inc. (Company's
                  wholly-owned subsidiary) and Bank One, Texas, N.A. and Compass
                  Bank-Houston

                                  Page 10 of 12

<PAGE>


         10.4     Amendment  to  Security   Agreement  (Joint  Venture Interest)
                  effective as of December 31, 1994 among Seitel  Offshore Corp.
                  (Company's wholly-owned  subsidiary) and Bank One, Texas, N.A.
                  and Compass Bank-Houston

         10.5     Amendment to Pledge  Agreement  effective as  of  December 31,
                  1994 among the Company,  Seitel  Geophysical,  Inc. (Company's
                  wholly-owned   subsidiary),   Seitel  Data  Corp.   (Company's
                  wholly-owned subsidiary) and Bank One, Texas, N.A. and Compass
                  Bank-Houston

         27       Article 5 Financial Data Schedule for 1st Quarter 1995

(b)      Not applicable.


                                  Page 11 of 12

<PAGE>

                                   SIGNATURES


     Pursuant to the  requirements  of the  Securities  and Exchange Act of
     1934,  the  registrant has duly caused this report to be signed on its
     behalf by the undersigned thereunto duly authorized.


                                          SEITEL, INC.





Dated:   May 12, 1995                     /s/ Paul A. Frame
                                          ----------------------
                                          Paul A. Frame
                                          President





Dated:   May 12, 1995                     /s/ Debra D. Valice
                                          ---------------------
                                          Debra D. Valice
                                          Chief Financial Officer





Dated:  May 12, 1995                      /s/ Marcia H. Kendrick
                                          ----------------------
                                          Marcia H. Kendrick
                                          Chief Accounting Officer

                                  Page 12 of 12





                                PROMISSORY NOTE



$12,500,000.00                  Houston, Texas                 December 31, 1994


         FOR VALUE RECEIVED and WITHOUT GRACE,  the  undersigned  (collectively,
"Maker"),  jointly  and  severally,  promise  to  pay to the  order  of  Compass
Bank-Houston  ("Payee"),  at its banking  quarters in  Houston,  Harris  County,
Texas,  the sum of Twelve  Million  Five  Hundred  Thousand  and No/100  Dollars
($12,500,000.00),  or so much  thereof  as may be  advanced  against  this  Note
pursuant to the Restated  Revolving Credit and Security  Agreement dated of even
date  herewith  by  and  among  Maker  and  Payee  (as  amended,   restated,  or
supplemented from time to time, the "Credit Agreement"),  together with interest
at the rates and calculated as provided in the Credit Agreement.

         Reference is hereby made to the Credit  Agreement for matters  governed
thereby,  including,  without limitation,  certain events which will entitle the
holder  hereof  to  accelerate  the  maturity  of  all  amounts  due  hereunder.
Capitalized  terms used but not  defined  in this Note  shall have the  meanings
assigned to such terms in the Credit Agreement.

         This Note is issued  pursuant to, is the "Compass  Note" under,  and is
payable as provided in the Credit  Agreement.  This Note is issued,  in part, in
renewal,  increase,  and extension of the outstanding  indebtedness evidenced by
that certain  Master  Revolving  Promissory  Note executed on or about March 18,
1994,  in the  maximum  amount of  $10,000,000.00,  executed  by  certain of the
parties  constituting  the Maker, to the order of Compass Bank, an Alabama state
banking  corporation.  Subject to compliance with  applicable  provisions of the
Credit Agreement,  Maker may at any time pay the full amount or any part of this
Note  without  the payment of any premium or fee,  but such  payment  shall not,
until this Note is fully paid and  satisfied,  excuse the  payment as it becomes
due of any payment on this Note provided for in the Credit Agreement.

         Without  being  limited  thereto or  thereby,  this Note is secured by,
among  other  things,  the  collateral  described  in  Section  5 of the  Credit
Agreement.

         THIS NOTE SHALL BE GOVERNED AND  CONTROLLED BY THE LAWS OF THE STATE OF
TEXAS WITHOUT GIVING EFFECT TO PRINCIPLES  THEREOF RELATING TO CONFLICTS OF LAW;
PROVIDED, HOWEVER, THAT VERNON'S TEXAS CIVIL STATUTES, ARTICLE 5069, CHAPTER 15
                                 --------------------





<PAGE>


(WHICH REGULATES CERTAIN  REVOLVING CREDIT LOAN ACCOUNTS AND REVOLVING  TRIPARTY
ACCOUNTS) SHALL NOT APPLY TO THIS NOTE.

                                           SEITEL, INC.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice, Vice President
                                             of Finance, Chief Financial
                                             Officer, Treasurer, and
                                             Secretary


                                          SEITEL DATA CORP.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer


                                          SEITEL GEOPHYSICAL, INC.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer


                                          SEITEL OFFSHORE CORP.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer


                                          EXSOL, INC.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer








                                PROMISSORY NOTE


$12,500,000.00                   Houston, Texas                December 31, 1994


                   FOR  VALUE  RECEIVED  and  WITHOUT  GRACE,   the  undersigned
(collectively,  "Maker"), jointly and severally,  promise to pay to the order of
Bank One, Texas,  National  Association  ("Payee"),  at its banking  quarters in
Houston,  Harris County,  Texas, the sum of Twelve Million Five Hundred Thousand
and No/100  Dollars  ($12,500,000.00),  or so much  thereof  as may be  advanced
against  this Note  pursuant  to the  Restated  Revolving  Credit  and  Security
Agreement  dated of even date herewith by and among Maker and Payee (as amended,
restated,  or supplemented from time to time, the "Credit Agreement"),  together
with interest at the rates and calculated as provided in the Credit Agreement.

                   Reference is hereby made to the Credit  Agreement for matters
governed  thereby,  including,  without  limitation,  certain  events which will
entitle  the  holder  hereof to  accelerate  the  maturity  of all  amounts  due
hereunder.  Capitalized  terms used but not  defined in this Note shall have the
meanings assigned to such terms in the Credit Agreement.

                   This  Note is  issued  pursuant  to,  is the  "Bank One Note"
under, and is payable as provided in the Credit Agreement.  This Note is issued,
in part, in renewal,  increase,  and extension of the  outstanding  indebtedness
evidenced by that certain Master Revolving  Promissory Note executed on or about
March 18, 1994, in the maximum amount of $10,000,000.00,  executed by certain of
the parties constituting the Maker, to the order of Payee. Subject to compliance
with applicable  provisions of the Credit  Agreement,  Maker may at any time pay
the full  amount or any part of this Note  without the payment of any premium or
fee, but such payment  shall not,  until this Note is fully paid and  satisfied,
excuse the payment as it becomes due of any payment on this Note provided for in
the Credit Agreement.

                   Without  being  limited  thereto  or  thereby,  this  Note is
secured by, among other  things,  the  collateral  described in Section 5 of the
Credit Agreement.

                   THIS NOTE SHALL BE GOVERNED AND CONTROLLED BY THE LAWS OF THE
STATE OF TEXAS WITHOUT GIVING EFFECT TO PRINCIPLES THEREOF RELATING TO CONFLICTS
OF LAW; PROVIDED, HOWEVER, THAT VERNON'S TEXAS CIVIL STATUTES, ARTICLE 5069,
                                         --------------------





<PAGE>


CHAPTER 15 (WHICH REGULATES CERTAIN REVOLVING CREDIT LOAN ACCOUNTS AND REVOLVING
TRIPARTY ACCOUNTS) SHALL NOT APPLY TO THIS NOTE.


                                          SEITEL, INC.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice, Vice President
                                             of Finance, Chief Financial
                                             Officer, Treasurer, and
                                             Secretary



                                          SEITEL DATA CORP.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer


                                          SEITEL GEOPHYSICAL, INC.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer


                                          SEITEL OFFSHORE CORP.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer


                                          EXSOL, INC.


                                          By: /s/ Debra D. Valice
                                             --------------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer












                RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT



                                     among



                             COMPASS BANK-HOUSTON,
                            as a Bank and the Agent



                                      and



                     BANK ONE, TEXAS, NATIONAL ASSOCIATION,
                                   as a Bank


                                      and


              SEITEL, INC., SEITEL GEOPHYSICAL, INC., EXSOL, INC.,
                 SEITEL DATA CORP., AND SEITEL OFFSHORE CORP.,
                                  as Borrowers



                    DATED EFFECTIVE AS OF DECEMBER 31, 1994




                    $25,000,000.00 REVOLVING LINE OF CREDIT



<PAGE>



                               TABLE OF CONTENTS
<TABLE>

<CAPTION>
                                                                                                                               Page

<S>                 <C>                                                                                                          <C>
SECTION 1           DEFINITIONS..................................................................................................  2

         1.1        Definitions..................................................................................................  2
         1.2        Accounting Terms............................................................................................. 26
         1.3        Other Terms.................................................................................................. 27
         1.4        References................................................................................................... 27
         1.5        Sections..................................................................................................... 27
         1.6        Number and Gender............................................................................................ 27
         1.7        Incorporation of Exhibits.................................................................................... 27
         1.8        Certain Other Matters of Construction........................................................................ 27

SECTION 2           CONDITIONS PRECEDENT......................................................................................... 27

         2.1        Conditions Precedent to Initial Advance...................................................................... 27
         2.2        Conditions Precedent to Each Loan............................................................................ 29

SECTION 3           BANKS' AGREEMENT TO MAKE ADVANCES............................................................................ 30

         3.1        Revolving Line............................................................................................... 30
         3.2        Borrowers' Loan Account...................................................................................... 31
         3.3        Additional Payments.......................................................................................... 32
         3.4        Post Maturity Advances....................................................................................... 32
         3.5        Borrowing Base............................................................................................... 32
         3.6        Borrowing Procedure for Notes................................................................................ 33
         3.7        Purpose...................................................................................................... 34
         3.8        Interest..................................................................................................... 34
         3.9        Repayment of Loans and Interest.............................................................................. 34
         3.10       Outstanding Amounts.......................................................................................... 35
         3.11       Time, Place, and Method of Payments.......................................................................... 35
         3.12       Voluntary Prepayments and Conversions of Loans............................................................... 35
         3.13       Commitment Fee............................................................................................... 36
         3.14       Facility Fee................................................................................................. 36
         3.15       Loans to Satisfy Obligations of Borrowers.................................................................... 36
         3.16       Security Interest in Accounts; Right of Offset............................................................... 36
         3.17       General Provisions Relating to Interest...................................................................... 37
         3.18       Yield Protection............................................................................................. 38
         3.19       Limitation on Types of Loans................................................................................. 39
         3.20       Illegality................................................................................................... 39
         3.21       Regulatory Change............................................................................................ 40
         3.22       Limitations on Interest Periods.............................................................................. 40
         3.23       No Commitment to Extend...................................................................................... 40

SECTION 4           BORROWER'S REPRESENTATIONS AND WARRANTIES.................................................................... 41

         4.1        Representations and Warranties............................................................................... 41




                                     - i -

<PAGE>




SECTION 5           SECURITY INTEREST OF BANKS IN COLLATERAL..................................................................... 48

         5.1        Creation of Security Interest................................................................................ 48
         5.2        Perfection of Security Interests............................................................................. 50
         5.3        Other Laws; Power of Attorney................................................................................ 50
         5.4        Obligations Secured.......................................................................................... 51
         5.5        Miscellaneous Collateral Provisions.......................................................................... 51
         5.6        Filing Reproductions......................................................................................... 51
         5.7        Independent Grants of Security Interests..................................................................... 51

SECTION 6           COLLECTION OF ACCOUNTS....................................................................................... 51

         6.1        Collection................................................................................................... 51
         6.2        Collection Actions By Borrowers.............................................................................. 52

SECTION 7           AFFIRMATIVE COVENANTS........................................................................................ 52

         7.1        Affirmative Covenants........................................................................................ 52

                    (a)          Defend Collateral............................................................................... 53
                    (b)          Pay Taxes and Assessments....................................................................... 53
                    (c)          Maintain Valid Security Interest................................................................ 53
                    (d)          Notice of Name Change........................................................................... 53
                    (e)          Financial Reporting............................................................................. 53
                    (f)          Federal Reporting............................................................................... 56
                    (g)          Decrease in Value............................................................................... 56
                    (h)          Movement of Inventory........................................................................... 56
                    (i)          Location of Records............................................................................. 56
                    (j)          Bankruptcy Code................................................................................. 57
                    (k)          Inspection...................................................................................... 57
                    (l)          Additional Notices.............................................................................. 57
                    (m)          Legal Expenses of Banks......................................................................... 58
                    (n)          Reimbursement of Certain Expenses............................................................... 59
                    (o)          Insurance....................................................................................... 59
                    (p)          INDEMNIFICATION................................................................................. 60
                    (q)          Operating Account............................................................................... 61
                    (r)          Comply With Law................................................................................. 61
                    (s)          Qualify as Foreign Corporation.................................................................. 62
                    (t)          Maintain Backup Data............................................................................ 62
                    (u)          Further Assurances.............................................................................. 62

SECTION 8           NEGATIVE COVENANTS........................................................................................... 62

         8.1        Negative Covenants of Borrowers.............................................................................. 62

                    (a)          Change of Location.............................................................................. 62
                    (b)          No Transfer of Collateral....................................................................... 63
                    (c)          No Change in Accounting Practices............................................................... 63
                    (d)          No Purchase of Stock............................................................................ 63
                    (e)          No Change in Ownership.......................................................................... 63
                    (f)          No Payment of Subordinated Debt................................................................. 63
                    (g)          Current Ratio................................................................................... 64



                                     - ii -

<PAGE>



                    (h)          Debt to Tangible Net Worth Ratio................................................................ 64
                    (i)          Cash Flow Coverage Ratio........................................................................ 64
                    (j)          Transactions with Affiliates.................................................................... 65
                    (k)          Consolidated Tangible Net Worth................................................................. 65
                    (l)          No Additional Debt.............................................................................. 65
                    (m)          No Transfer of Seismic Data..................................................................... 66
                    (n)          No Acquisitions of Other Entities............................................................... 66
                    (o)          No Loans or Advances............................................................................ 66
                    (p)          No Dividends or Distributions................................................................... 67
                    (q)          No Change in Basic Business..................................................................... 67
                    (r)          Purpose......................................................................................... 67
                    (s)          Permitted Transactions.......................................................................... 67
                    (t)          No Purchase of Margin Security.................................................................. 67

SECTION 9           EVENTS OF DEFAULT; ACCELERATION.............................................................................. 67

         9.1        Events of Default............................................................................................ 67

                    (a)          Payment Defaults................................................................................ 67
                    (b)          Non Performance of Covenants.................................................................... 68
                    (c)          Failure to Pay Insurance Payments............................................................... 68
                    (d)          Non Compliance With Inspections................................................................. 68
                    (e)          Meeting of Creditors............................................................................ 68
                    (f)          Changes in Ownership or Senior Management....................................................... 68
                    (g)          Fraud........................................................................................... 68
                    (h)          Termination of Credit Document 1................................................................ 68
                    (i)          Breach of Warranty or Representation............................................................ 68
                    (j)          Default in Other Obligations.................................................................... 69
                    (k)          Failure to Satisfy Condition Precedent.......................................................... 69
                    (l)          Insolvency...................................................................................... 69
                    (m)          Insolvency Proceedings.......................................................................... 69
                    (n)          Levy on Property................................................................................ 70
                    (o)          Final Orders, Judgments, and Decrees............................................................ 70
                    (p)          Governmental Charges............................................................................ 70
                    (q)          Fraudulent Transfers............................................................................ 70
                    (r)          Not a First Security Interest................................................................... 70
                    (s)          Material Adverse Change......................................................................... 70
                    (t)          Cessation of Business........................................................................... 71
                    (u)          Contest by Borrower or Affiliate................................................................ 71
                    (v)          Transfer of Stock............................................................................... 71
                    (w)          Filing of Lawsuits.............................................................................. 71

SECTION 10          POWER TO SELL OR COLLECT COLLATERAL; RIGHTS AND REMEDIES..................................................... 71

         10.1       Acceleration................................................................................................. 71
         10.2       Rights and Remedies With Respect to Collateral............................................................... 72
         10.3       Uniform Commercial Code Remedies............................................................................. 73
         10.4       Proceeds..................................................................................................... 73
         10.5       Deficiency................................................................................................... 73
         10.6       Agent's Duties............................................................................................... 73
         10.7       Non-Judicial Remedies........................................................................................ 74
         10.8       Remedies Not Exclusive....................................................................................... 74



                                    - iii -

<PAGE>


         10.9       Successive Sales............................................................................................. 74
         10.10      Enforcement Against Particular Collateral.................................................................... 75
         10.11      Suit Against Borrowers....................................................................................... 75

SECTION 11          EXPENSES: PROCEEDS OF COLLATERAL............................................................................. 75

         11.1       Collection Costs............................................................................................. 75

SECTION 12          THE AGENT.................................................................................................... 75

         12.1       Appointment.................................................................................................. 75
         12.2       Delegation of Duties......................................................................................... 76
         12.3       Exculpatory Provisions....................................................................................... 76
         12.4       Reliance by Agent............................................................................................ 76
         12.5       Notice of Default............................................................................................ 77
         12.7       INDEMNIFICATION.............................................................................................. 78
         12.8       Primary and Secondary Collateral............................................................................. 79
         12.9       Restitution.................................................................................................. 79
         12.10      Agent in Its Individual Capacity............................................................................. 80
         12.11      Successor Agent.............................................................................................. 80
         12.12      Applicable Parties........................................................................................... 80

SECTION 13          GENERAL...................................................................................................... 81

         13.1       Waivers...................................................................................................... 81
         13.2       Replacement of Prior Loan Agreement.......................................................................... 81
         13.3       Lien Continuation............................................................................................ 81
         13.4       Notices...................................................................................................... 82
         13.5       Transfers and Participations................................................................................. 82
         13.6       GOVERNING LAW................................................................................................ 83
         13.7       Entire Agreement............................................................................................. 83
         13.8       Construction and Severability................................................................................ 83
         13.9       Other Advances............................................................................................... 84
         13.10      No Duty or Special Relationship.............................................................................. 84
         13.11      NO CONTROL BY BANKS.......................................................................................... 84
         13.12      No Partnership............................................................................................... 85
         13.13      Calculation of Financial Covenants........................................................................... 85
         13.14      No Restrictions on DDD Energy, Inc........................................................................... 85
         13.15      Binding Effect............................................................................................... 85
         13.16      Renewal of Indebtedness...................................................................................... 85
         13.17      Banks' Discretion............................................................................................ 86
         13.18      Counterparts................................................................................................. 86
         13.19      Business Loans............................................................................................... 86
         13.20      JURISDICTION AND VENUE....................................................................................... 86
         13.21      DECEPTIVE TRADE PRACTICES.................................................................................... 86

</TABLE>

                                     - iv -
<PAGE>

                RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT


                  THIS  RESTATED  REVOLVING  CREDIT AND  SECURITY  AGREEMENT  is
entered  into  and  executed  this 4th day of May,  1995,  but  effective  as of
December 31, 1994, by and among SEITEL, INC., a Delaware corporation ("Seitel"),
SEITEL DATA CORP., a Delaware corporation ("Data"), SEITEL GEOPHYSICAL,  INC., a
Delaware  corporation   ("Geophysical"),   SEITEL  OFFSHORE  CORP.,  a  Delaware
corporation  ("Offshore"),  and EXSOL,  INC., a Delaware  corporation  ("Exsol";
collectively with Seitel, Data, Geophysical,  and Offshore,  "Borrowers"),  each
with their respective  chief executive  offices and principal places of business
at 50 Briar Hollow Lane, 7th Floor West, Houston,  Texas 77027; BANK ONE, TEXAS,
NATIONAL  ASSOCIATION,  a national  banking  association  ("Bank One"),  with an
office at 910 Travis,  Houston,  Texas 77002; and COMPASS BANK-HOUSTON,  a Texas
state chartered banking institution  ("Compass"),  with an office at 24 Greenway
Plaza,  Houston,  Texas 77046, and a mailing address of P.O. Box 4444,  Houston,
Texas 77210-4444. Bank One, Compass, and each financial institution that becomes
a party  hereto or  entitled  to the  benefits  and  subject to the  obligations
hereunder  subsequent  to the date  hereof,  is referred to herein as "Bank" and
collectively  as "Banks".  Compass is the agent for Banks in accordance with the
terms  hereof and is referred to herein,  in such  capacity  (together  with any
successors designated pursuant hereto) as "Agent".

                  Borrowers have, jointly and severally,  applied to Banks for a
revolving  line of credit  (the  "Revolving  Line")  not to exceed an  aggregate
principal amount at any one time  outstanding of TWENTY-FIVE  MILLION AND NO/100
Dollars  ($25,000,000.00),  to be secured  by,  among other  things,  a security
interest in all of the Collateral (as such term is hereinafter defined and used)
now owned or hereafter  acquired by any Borrower,  on the terms  hereinafter set
forth.  Banks are willing to extend such a Revolving  Line to Borrowers up to an
aggregate  amount not in excess of the amount set forth above upon the  security
of,  among other  things,  such  Collateral  and on the terms and subject to the
conditions hereinafter set forth.


                                   AGREEMENT:

                  NOW,  THEREFORE,  in consideration of the above premises,  the
credit to be extended  hereunder,  the mutual  agreements  of the parties as set
forth  herein  and  other  good and  valuable  consideration,  the  receipt  and
sufficiency  of which are hereby  acknowledged,  the  parties,  intending  to be
legally bound hereby, agree as follows:



                                       1


<PAGE>



                                   SECTION 1
                                  DEFINITIONS

                 1.1  Definitions.  In addition  to the defined  terms set forth
elsewhere herein, the following terms shall have the meanings set forth below:

         "Accounts"  and  "Accounts  Receivable"  shall  mean (a) all  accounts,
         accounts  receivable,  book debts, notes, notes receivable,  contracts,
         contract  rights,   retail   installment   sales   contracts,   drafts,
         instruments,  conditional sales contracts,  chattel mortgages,  chattel
         paper,  title  retention  and lien  instruments,  security  agreements,
         Participation Agreements,  Licensing Agreements,  distributions payable
         or which will be payable to Offshore  under or in  connection  with the
         Digitel  Agreement,   documents,   acceptances,   and  other  forms  of
         obligations now owned or hereafter received or acquired by or belonging
         or owing to any Borrower from whatever source  arising,  whether or not
         earned yet by performance,  including,  without  limitation,  under any
         trade names, styles, or divisions thereof, and whether arising from the
         sale or lease  of  goods or the  rendition  of  services  or any  other
         transaction,  including,  without limitation, any such obligation which
         might be characterized as an account,  general  intangible,  other than
         contract  rights  under  contracts   containing   prohibitions  against
         assignment of or the granting of a security interest in the rights of a
         party thereunder, or chattel paper under the Uniform Commercial Code in
         effect in any jurisdiction;  (b) all rights of any Borrower in, to, and
         under all purchase  orders now owned or hereafter  received or acquired
         by any Borrower  for goods or services;  (c) all rights of any Borrower
         in and to any goods, services, and other property, the sale or lease of
         which gave rise to any of the foregoing, including, without limitation,
         returned or  repossessed  goods and rights of unpaid  sellers;  (d) all
         moneys (or cash equivalents) and non-cash proceeds due or to become due
         to any Borrower,  or other rights of any Borrower,  under all contracts
         for the sale or lease of goods or the performance of services,  whether
         or  not  earned  by  performance,  or  in  connection  with  any  other
         transaction,  now in existence or hereafter arising;  (e) all state and
         federal tax refunds due to any Borrower;  (f) all of the right,  title,
         and interest of any Borrower in and to the goods,  services,  and other
         property which secures any of the foregoing,  and the  guarantees,  and
         collateral  securing such  guarantees,  of any kind given by any Person
         with respect to any of the  foregoing;  (g) all insurance  policies and
         proceeds relating thereto;  (h) all of the rights of any Borrower as an
         unpaid seller of goods or services,  including, without limitation, the
         rights of stoppage in transit, replevin, and resale; (i) all files,



                                       2

<PAGE>



         records,  ledgers,  invoices,  and  documents  evidencing  any  of  the
         foregoing;  and (j)  all of the  foregoing,  whether  now  existing  or
         hereafter created or acquired.

         "Account Debtor" shall mean the person who is obligated
         on or under any Account.

         "Additional  Costs"  shall mean  costs  which any Bank  determines  are
         attributable to its obligation to make or its making or maintaining any
         LIBO Rate Loan,  or any  reduction  in any amount to be received by any
         Bank in respect of any such obligation or any LIBO Rate Loan, resulting
         from any  Regulatory  Change which (a) changes the basis of taxation of
         any amounts  payable to such Bank under this  Agreement or the Notes in
         respect of any LIBO Rate Loan (other than taxes  imposed on the overall
         net income of such Bank), (b) imposes or modifies any reserve,  special
         deposit,  minimum  capital,  capital  rates,  or  similar  requirements
         relating  to any  extensions  of  credit  or other  assets  of,  or any
         deposits with or other  liabilities  of, any Bank  (including LIBO Rate
         Loans and dollar deposits in the London  interbank market in connection
         with LIBO Rate Loans), or any commitments of any Bank hereunder, or (c)
         imposes any other  condition  affecting  this  Agreement or any of such
         extensions of credit, liabilities, or commitments.

         "Adjusted  LIBO Rate" shall mean,  for any LIBO Rate Loan,  an interest
         rate per annum (rounded upwards, if necessary,  to the nearest 1/100 of
         1%) determined by the Banks to be equal to the sum of the LIBO Rate for
         such Loan plus the  Applicable  Margin,  but in no event  exceeding the
         Highest Lawful Rate.

         "Affiliate"  shall mean any Person directly or indirectly  controlling,
         or under common control with, the Borrowers and includes any Subsidiary
         of any of the  Borrowers  and any  "affiliate"  of any of the Borrowers
         within  the  meaning  of  Reg.   ss.240.12b-2  ("Rule  12b-2")  of  the
         Securities Exchange Act of 1934, as amended, with "control," as used in
         this definition, having the meaning set forth in Rule 12b-2.

         "Agreement"  shall mean this  Restated  Revolving  Credit and  Security
         Agreement, as it may be amended, supplemented, or restated from time to
         time.

         "Applicable Lending Offices" shall mean the lending office of the Banks
         (or an affiliate of the Banks)  designated  on the first page hereof or
         such other  office of the Banks (or an  affiliate  of the Banks) as the
         Banks  may  from  time to  time  specify  to the  Borrowers  (or  their
         representatives)  as the  office by which  Loans of such type are to be
         made and maintained.



                                       3

<PAGE>




         "Applicable  Margin" shall mean as to each LIBO Rate Loan,  two percent
         (2.00%).

         "Bank One Note" shall mean the promissory note of the Borrowers payable
         to the order of Bank One in the form attached as Exhibit "C",  together
         with all renewals, extensions for any period, increases,  replacements,
         modifications, substitutions, and rearrangements thereof.

         "Borrowers'  Loan Account" shall mean the account on the books of Agent
         in which Agent will record loans and other  advances  made by Agent for
         Banks to or for the benefit of one or more  Borrowers  pursuant to this
         Agreement,  payments  received  on such  loans,  and other  appropriate
         debits and credits as provided by Section 3.2.

         "Borrowing  Base"  shall mean an amount  equal to the sum of (a) 85% of
         the amount of the Eligible Accounts,  plus (b) the lesser of (i) 25% of
         the amount of Eligible Inventory or (ii) $10,000,000.00.

         "Borrowing  Base  Report"  shall  mean  that  certain   Borrowing  Base
         calculation, substantially in the form of Exhibit "A" attached hereto.

         "Borrowing  Request" shall mean each written request,  in substantially
         the form  attached  hereto  as  Exhibit  "E",  by  Seitel  to the Agent
         confirmed  by a telephone  call from  Seitel to Agent for a  borrowing,
         conversion,  or  prepayment  pursuant  to  Sections  3.6  or  3.12,  or
         otherwise, each of which shall:

               (a)    be signed by a Responsible Officer of
                      Seitel;

               (b)    specify  the amount and type of Loan  requested,  and,  as
                      applicable,  the Loan to be  converted  or prepaid and the
                      date of the borrowing,  conversion,  or prepayment  (which
                      shall be a Business Day);

               (c)    when  requesting a Floating Rate Loan, be delivered to the
                      Agent  no later  than  10:00  a.m.,  Central  Standard  or
                      Daylight Savings Time, as the case may be, on the Business
                      Day of the requested borrowing, conversion, or prepayment;
                      and

               (d)    when  requesting  a LIBO Rate Loan,  be  delivered  to the
                      Agent  no later  than  10:00  a.m.,  Central  Standard  or
                      Daylight  Savings  Time,  as the case may be, one Business
                      Day  preceding  the requested  borrowing,  conversion,  or
                      prepayment and designate



                                              4

<PAGE>



                      the Interest Period requested with respect
                      to such Loan.

         "Business Day" shall mean (a) for all purposes other than as covered by
         clause (b) of this  definition,  a day other than a  Saturday,  Sunday,
         legal  holiday  for  commercial  banks  under  the laws of the State of
         Texas,  or any  other day when  banking  is  suspended  in the State of
         Texas,   and  (b)  with   respect  to  all   requests,   notices,   and
         determinations  in  connection  with,  and  payments of  principal  and
         interest on, LIBO Rate Loans,  a day which is a Business Day  described
         in clause (a) of this  definition and which is a day for trading by and
         between banks for Dollar deposits in the London interbank market.

         "Closing  Date" shall mean the  execution  date of this  Agreement,  as
         reflected on the first page of this Agreement.

         "Collateral"  shall  mean all of each  Borrower's  Accounts,  Equipment
         (excluding office equipment,  furnishings and Exsol's,  Offshore's, and
         Geophysical's   Equipment  not  constituting   Seismic  Data),  General
         Intangibles, Seismic Data and other Inventory, all outstanding stock of
         each of Seitel's  Subsidiaries  (other than DDD Energy,  Inc.), and any
         and all other personal  property of any Borrower or any other Person in
         which  Banks  acquired,  now have,  or by this  Agreement  or any other
         agreement acquires,  or hereafter acquires, a security interest,  lien,
         or other rights or  interests as security for any or all of  Borrower's
         Liabilities,  including,  without  limitation,  Borrower's  obligations
         under this Agreement.

         "Commitment" shall mean the obligation of each Bank, according to their
         Commitment  Percentage  and,  subject to applicable  provisions of this
         Agreement,  to  make  Loans  to or for  the  benefit  of the  Borrowers
         pursuant to Section 3.1.

         "Commitment Amount" shall mean the lesser of (a) the
         Borrowing Base, or (b) $25,000,000.00.

         "Commitment  Fee"  shall  mean  each fee  payable  to the  Banks by the
         Borrowers pursuant to Section 3.13.

         "Commitment  Period"  shall  mean the  period  from and  including  the
         Closing Date to but not including the Commitment Termination Date.

         "Commitment Percentage" shall mean as to Bank One, 50%
         and Compass, 50%.




                                       5

<PAGE>



         "Commitment  Termination  Date"  shall mean the earlier to occur of (a)
         June 1, 1997, or (b) the date on which an Event of Default shall occur.

         "Commonly  Controlled  Entity"  shall  mean any  Person  which is under
         common control with the Borrowers within the meaning of Section 4001 of
         ERISA.

         "Compass Alabama" shall mean Compass Bank, an Alabama
         banking corporation.

         "Compass Note" shall mean the promissory note of the Borrowers  payable
         to the order of Compass in the form  attached as Exhibit "D",  together
         with all renewals, extensions for any period, increases,  replacements,
         modifications, substitutions, and rearrangements thereof.

         "Compliance  Certificate"  shall mean that certain  Certificate  in the
         form of Exhibit "B" attached hereto.

         "Credit  Documents"  shall mean this  Agreement,  the Notes,  the Prior
         Security   Agreements,   the   Notification   and   Acknowledgment   of
         Registration  of  Security  Interest/Pledge  dated as of May 19,  1994,
         among Bank One, Compass Alabama,  Offshore, and Digitel, and such other
         instruments,   documents,  and  agreements  evidencing,   securing,  or
         pertaining  to the loans which have  heretofore  been or hereafter  are
         from  time  to  time   executed  and   delivered  to  Banks  (or  their
         predecessors)  by  Borrowers  (or any of  them),  or any  other  Person
         pursuant to this Agreement or otherwise.

         "Current  Assets" shall mean all assets which would, in accordance with
         GAAP, be included as current assets on a consolidated  balance sheet of
         Seitel as of the date of  calculation  (regardless  of how  assets  are
         actually classified on Seitel's  consolidated balance sheet);  provided
         that, for purposes of this Agreement, Current Assets do not include any
         of the Seismic Data (including,  without  limitation,  any Seismic Data
         which  could be  classified  as a  current  asset  on the  consolidated
         balance sheet of Seitel),  but do include the unadvanced portion of the
         Borrowing Base (not to exceed $25,000,000.00).

         "Current  Liabilities"  shall  mean all  liabilities  which  would,  in
         accordance  with  GAAP,  be  included  as  current   liabilities  on  a
         consolidated  balance  sheet of  Seitel  as of the date of  calculation
         (regardless  of how  liabilities  are actually  classified  on Seitel's
         consolidated balance sheet).

         "DDD Credit Agreement" shall mean the Credit Agreement, among Banks and
         DDD Energy, Inc., as may be amended from time to time.



                                       6

<PAGE>




         "Default"  shall mean any event or  occurrence  which with the lapse of
         time or the giving of notice or both would become an Event of Default.

         "Digitel" shall mean Digitel Data Joint Venture.

         "Digitel Agreement" shall mean the Digitel Data Joint
         Venture Agreement, between Offshore and Digicon Data,
         Inc., as may be amended.

         "Dollars"  and "$" shall mean dollars in lawful  currency of the United
         States of America.

         "Eligible  Account"  shall mean an Account of any one or more Borrowers
         in  which  Banks  and/or  Agent  maintain  a first  perfected  security
         interest and which meets each of the following requirements:

                (a)    (i) with respect to Accounts  arising from the  licensing
                       of Seismic Data only,  it is a payment  obligation  of an
                       Account  Debtor  arising  in  connection  with  the  non-
                       exclusive  licensing of any Borrower's Seismic Data under
                       a  Licensing  Agreement  substantially  in  the  form  of
                       Exhibit  "F"  or  under  a  Participation   Agreement  in
                       substantially  the  form of  Exhibit  "G",  such  license
                       having  been  granted  by  the  applicable  Borrower  and
                       accepted  by  the  Account  Debtor,  and  the  applicable
                       Borrower's  full right to  payment  for all sums due from
                       such Account  Debtor with  respect to such Account  shall
                       have been  earned and then be due and payable  and,  (ii)
                       with  respect to all other types of  Accounts,  it arises
                       from  the  sale  or  lease  of  goods  or  from  services
                       rendered,  such goods have been  shipped or  delivered to
                       the Account  Debtor under such Account and such  services
                       have been fully  performed  and have been accepted by the
                       Account Debtor, and the applicable  Borrower's full right
                       to payment for all sums due from such Account Debtor with
                       respect to such Account Receivable shall have been earned
                       and then be due and payable;

                (b)    it is a valid and legally  enforceable  obligation of the
                       Account Debtor thereunder according to its express terms,
                       and  is  not   subject  to  any   offset,   counterclaim,
                       crossclaim,  or other defense on the part of such Account
                       Debtor denying liability thereunder in whole or in part;



                                              7

<PAGE>




                (c)    it  is  not  subject  to  any  mortgage,  lien,  security
                       interest,   or  similar   adverse   rights  or  interests
                       whatsoever other than security interests granted to Banks
                       and/or Agent for the benefit of Banks;

                (d)    it is  evidenced  by an invoice  (or  similar  document),
                       dated not later than the date of  shipment,  performance,
                       or licensing,  rendered to such Account Debtor, and if it
                       is  evidenced  by an  instrument  or note,  if and to the
                       extent  requested by the Required Banks,  Borrowers shall
                       deliver to Agent the  original  of any and all notes held
                       by it  (endorsed  to the order of Agent),  drafts,  title
                       retention  and  lien  instruments,  security  agreements,
                       acceptances,    conditional   sale   contracts,   chattel
                       mortgages  or chattel  paper,  and the Banks may  exclude
                       from  Eligible  Accounts  any of such items which are not
                       delivered  to Agent (upon and to the extent  requested by
                       the Required Banks in accordance with this paragraph) and
                       in which the Banks do not have a perfected first security
                       interest;

                (e)    it is not owing by an Account  Debtor  whose  obligations
                       with  respect to which  Agent,  acting in its  reasonable
                       discretion  on behalf of the Banks,  shall have  notified
                       Seitel (on behalf of Borrowers)  orally  (confirming such
                       notice  promptly in writing) that Accounts  owing by such
                       Account Debtor do not constitute an Eligible Account;

                (f)    it is  not  due  from  (i)  an  Affiliate,  or  (ii)  any
                       stockholder   (other  than  a  stockholder   of  Seitel),
                       officer, director, manager, or employee of one or more of
                       Borrowers or of any  Affiliate,  or (iii) any  individual
                       who is a relative of any one or more of the  foregoing by
                       blood or marriage;

               (g)    it does not constitute,  require,  or provide for progress
                      billings  (except  with  respect to progress  billings for
                      work and services which have been completed and accepted),
                      retainages,  or  deferred  payments  under a contract  not
                      fully performed;




                                              8

<PAGE>



               (h)    it does not  constitute  interest  or  finance  charges on
                      outstanding  balances  nor any amount  received  as a down
                      payment or  prepayment  or other  principal  reduction  or
                      similar payment;

               (i)    it  is  an  Account  with  respect  to  which  no  return,
                      repossession,   rejection,  cancellation,  or  repudiation
                      shall have occurred or have been threatened;

                (j)    it is not  subject  to any trial  terms,  sales-or-return
                       terms,  consignment  terms,  guaranteed sales performance
                       terms,  C.O.D.  terms,  cash terms,  or similar  terms or
                       conditions;

                (k)    it is  not  owed  by an  Account  Debtor  that  is not an
                       individual  residing in the United  States or Canada or a
                       corporation or partnership organized and validly existing
                       or  qualified  to do  business  under the laws of a state
                       within the United  States or Canada  (provided,  however,
                       that  Eligible   Accounts  owing  from  Account   Debtors
                       residing,  organized,  or  qualified  in Canada shall not
                       exceed twenty  percent  (20%) of the  aggregate  value of
                       Borrowers' Eligible Accounts);

                (l)    it is not an Account subject, in whole or in part, to any
                       "bill and hold" or similar arrangement  pursuant to which
                       the invoice (or similar  document) is delivered  prior to
                       the actual  delivery  of the sold or leased  goods or the
                       performance  of  the  services;   without   limiting  the
                       foregoing, for purposes of clarification,  an Account for
                       which an invoice or billing has been issued to an Account
                       Debtor and the Account  Debtor is to select a  particular
                       type of Seismic Data to purchase,  such an Account  shall
                       (subject  to the other  subsections  of this  definition)
                       constitute an Eligible  Account provided that amounts are
                       actually then due and owing under and with respect to the
                       invoice or  billing,  regardless  of whether  the Account
                       Debtor has  selected  the  particular  Seismic Data to be
                       purchased;

                (m)    unless  otherwise  agreed by Banks, (i) if the Account is
                       evidenced by an invoice  which  requires  payment in full
                       thereof



                                              9

<PAGE>



                      within 30 days from the date thereof, it is not an Account
                      with  respect to which one  hundred  twenty  (120) days or
                      more shall have passed  since the relevant  invoice  date;
                      (ii) if the Account is to be paid by the Account Debtor in
                      multiple installments,  as a deferred payment, or on other
                      terms and such Account is due to be paid in full  pursuant
                      to such  installments  or terms  within  120 days from the
                      original  invoice date, it is not an Account for which any
                      particular installment or other payment is 30 days or more
                      past due;  and (iii) if the  Account  is to be paid by the
                      Account Debtor in multiple  installments or on other terms
                      and such  Account  is due to be paid in full  pursuant  to
                      such  installments  or  terms  120  days or more  from the
                      original  invoice date, it is not an Account for which any
                      particular  installment or other payment is 5 days or more
                      past  due;  provided  that  the  aggregate  amount  of any
                      installments  or other payments due on and with respect to
                      such  Account  12 months or more past the date of the most
                      recent  monthly  Borrowing  Base  Report  submitted  under
                      Section  7.1(e)(iv),   shall  be  excluded  from  Eligible
                      Accounts  in  connection  with  such  calculation  of  the
                      Borrowing Base;

               (n)    it is not  owed by any  Account  Debtor  who  has  account
                      balances  with  one or  more  of  Borrowers  equalling  or
                      exceeding ten percent (10%) of its total Accounts which do
                      not constitute Eligible Accounts;

                (o)    if it is an Offshore  Account  (notwithstanding  anything
                       herein  to  the   contrary),   then  (i)  it  must  be  a
                       distribution   then  payable  (or  which  is   reasonably
                       expected to be payable  within one hundred  twenty  (120)
                       days)  to  Offshore  under  and in  connection  with  the
                       Digitel  Agreement  by  virtue of an  Underlying  Digitel
                       Account,  which  meets  the  definition  of  an  Eligible
                       Account  as  provided   for   herein,   except  that  (x)
                       references to Borrowers in such definition (other than in
                       subsection (e)) will be deemed references to Digitel; (y)
                       no  Person,  including  Banks,  shall have any lien on or
                       security  interest  in such  Underlying  Digitel  Account
                       (other than



                                       10

<PAGE>



                      Permitted Liens);  and (z) such Underlying Digitel Account
                      must not be  evidenced by an  instrument,  note or chattel
                      paper (the "Acceptable Underlying Digitel Account");  (ii)
                      such  Offshore  Account  shall  be  an  Eligible  Offshore
                      Account;  and (iii) such Offshore  Account shall be deemed
                      to have a value, for purposes of determining the Borrowing
                      Base, not in excess of the lesser of (x) $1,000,000.00, or
                      (y) fifty  percent  (50%) of the  difference  obtained  by
                      subtracting  (A) the  outstanding  value of the Acceptable
                      Underlying  Digitel Account to which such Offshore Account
                      relates,   less  (B)  all  applicable  sales  commissions,
                      rebates,  taxes,  management fees,  insurance costs,  data
                      storage  fees,  copying  fees and  charges  and any  other
                      costs,  expenses  and  amounts  which  may  reasonably  be
                      expected by Banks not to be available for  distribution to
                      Offshore  within  one  hundred  twenty  (120)  days of the
                      creation of such Underlying Digitel Account;

                (p)    it is not an Account  or a portion  of an  Account  that,
                       when  aggregated  with  all  other  Accounts  owed  by an
                       Account  Debtor  liable   therefore  (the   "Concentrated
                       Account Debtor"),  exceeds  twenty-five  percent (25%) of
                       the  total  value  of one or  more  of  Borrowers'  total
                       Accounts (the "25% Collar") (provided, however, that this
                       provision shall not apply until Banks give oral notice to
                       Borrowers (confirming such notice promptly in writing) of
                       its  intention  to apply  this  provision  to a  specific
                       Account  Debtor and,  provided  further,  this  provision
                       shall not be deemed to exclude  from  otherwise  Eligible
                       Accounts the portion of Accounts  owing by a Concentrated
                       Account Debtor as do not exceed the 25%
                      Collar); and

                (q)    it is not an Account in which any  Borrower has failed to
                       perform all of its obligations  with respect to the goods
                       or services, the sale or lease or rendition of which gave
                       rise to the  Account,  unless the  failure to perform any
                       such   obligation   does   not   adversely   impact   the
                       collectability of all amounts due on such Account.




                                       11

<PAGE>



         "Eligible  Inventory"  shall mean  Seismic Data to which any one of the
         Borrowers  holds  good  title,   which  meets  each  of  the  following
         requirements:

                (a)    it does not include Eligible Accounts or any other rights
                       to payment or  receivables  arising  under any  Licensing
                       Agreements, Participation Agreements or otherwise;

                (b)    it is not  licensed  under  a  proprietary  agreement  or
                       exclusive Licensing Agreement;

                (c)    it is Seismic Data that has generated licensing income of
                       at least ten (10)  percent of its book  value  during the
                       previous four (4) full consecutive quarters;

                (d)    it is not Seismic Data acquired through any of Borrowers'
                       joint ventures or  partnerships or under or in connection
                       with  any  Participation  Agreement,  unless  such  joint
                       ventures, partnerships or Participation Agreements are in
                       form and substance acceptable to Banks and, then, only to
                       the extent Borrowers directly own
                      such Seismic Data;

                (e)    it is subject to Banks'  (and/or  Agent's for the benefit
                       of Banks) first  perfected  security  interest and is not
                       subject to any lien, security interest,  mortgage, pledge
                       or other interest adverse to Banks,  other than Permitted
                       Liens; and

                (f)    it is not patented, trademarked or copyrighted or subject
                       to any patent, trademark or copyright.

         "Eligible  Offshore  Accounts"  shall mean each Offshore  Account which
         meets each of the following requirements:

                (a)    such  Offshore  Account  is or will  within  one  hundred
                       twenty  (120)  days  of the  creation  of the  Underlying
                       Digitel  Account  be the  valid and  legally  enforceable
                       obligation of Digitel to make  payments of  distributions
                       to Offshore which  distributions have been or will within
                       such time period be validly authorized;

                (b)    such  Offshore  Account  is not  subject  to any  offset,
                       counterclaim, crossclaim or other 



                                       12

<PAGE>



                       defense on the part of Digitel or any other party denying
                       liability therefor or thereunder in whole or part;

                (c)    such  Offshore  Account is not  subject to any  mortgage,
                       lien,  security  interest,  or similar  adverse rights or
                       interests  whatsoever  other than the security  interests
                       granted to Banks and/or Agent for the benefit of Banks;

                (d)    such  Offshore  Account  is  not  past  due  and  is  not
                       evidenced by an instrument, note or chattel paper;

                (e)    such  Offshore  Account is not a payment of interest or a
                       repayment  of loan  principal  or a  repayment  or  other
                       return of capital;

                (f)    not more than one  hundred  twenty  (120) days shall have
                       passed since such Offshore  Account first  constituted an
                       Eligible Account; and

                (g)    such  Offshore  Account  which is  otherwise  an Eligible
                       Account shall only be  considered an Eligible  Account as
                       long  as  Offshore  is  in  full   conformity   with  its
                       obligations  and agreements  under the Digitel  Agreement
                       and  Digitel  (i)  is  not in  default  under  any of its
                       material agreements or obligations,  (ii) has not caused,
                       allowed or  suffered  to occur any lien,  claim,  charge,
                       security  interest,   mortgage,  secondary  financing  or
                       encumbrance  to exist or be asserted in,  against or upon
                       any of Digitel's  property or assets except for (x) liens
                       of   carriers,   warehousemen,    landlords,   mechanics,
                       laborers,  and materialmen  arising by law for sums which
                       are (A) not yet due or (B) being diligently  contested in
                       good  faith and with  respect  to which  Digitel  has set
                       aside  sufficient  reserves and (y) liens for taxes which
                       are (A) not yet due or (B) being diligently  contested in
                       good  faith and with  respect  to which  Digitel  has set
                       aside sufficient  reserves and (C) is not indebted to any
                       person or entity other than for trade  payables  incurred
                       in the ordinary course of business.




                                       13

<PAGE>



         "Environmental  Complaint"  shall mean any  written or oral  complaint,
         order,  directive,  claim, citation,  notice of environmental report or
         investigation,  or other  notice by any  Governmental  Authority or any
         written  complaint  from  any  other  Person  with  respect  to (a) air
         emissions,   (b)  spills,   releases,   or  discharges  to  soils,  any
         improvements located thereon, surface water, groundwater, or the sewer,
         septic,  waste treatment,  storage,  or disposal systems  servicing any
         Property of the Borrowers,  (c) solid or liquid waste disposal, (d) the
         use, generation, storage, transportation,  or disposal of any Hazardous
         Substance,  or (e)  other  environmental,  health,  or  safety  matters
         affecting  any  Property of the  Borrowers  or the  business  conducted
         thereon.

         "Environmental  Laws" shall mean (a) the following federal laws as they
         may be cited, referenced,  and amended from time to time: the Clean Air
         Act,   the  Clean  Water  Act,  the  Safe   Drinking   Water  Act,  the
         Comprehensive  Environmental Response,  Compensation and Liability Act,
         the Endangered Species Act, the Resource Conservation and Recovery Act,
         the  Occupational  Safety  and  Health  Act,  the  Hazardous  Materials
         Transportation Act, the Superfund  Amendments and Reauthorization  Act,
         and the  Toxic  Substances  Control  Act;  (b)  any and all  equivalent
         environmental  statutes  of any state in which  Property  of any of the
         Borrowers is  situated,  as they may be cited,  referenced  and amended
         from time to time;  (c) any rules or regulations  promulgated  under or
         adopted pursuant to the above federal and state laws; and (d) any other
         equivalent federal,  state, or local statute or any requirement,  rule,
         regulation,   code,  ordinance,  or  order  adopted  pursuant  thereto,
         including,  without  limitation,  those  relating  to  the  generation,
         transportation,  treatment, storage, recycling,  disposal, handling, or
         release of Hazardous Substances.

         "Equipment" shall mean all machinery,  apparatus,  equipment, fittings,
         furniture,   fixtures,  motor  vehicles  and  other  tangible  personal
         Property (other than  Inventory) of every kind and description  used in
         any  Borrower's  operations  or owned by any  Borrower  or in which any
         Borrower has an interest,  whether now owned or hereafter  acquired and
         wherever located, and all parts,  accessories and special tools and all
         increases and accessions  thereto and  substitutions  and  replacements
         therefor.

         "ERISA" shall mean the Employee Retirement Income Security Act of 1974,
         as  amended  from  time to time,  and the  regulations  thereunder  and
         interpretations thereof.

         "Event of Default" shall mean any of the events  specified in Section 9
         of this Agreement.



                                       14

<PAGE>




         "Facility Fee" shall mean the fee payable to the Banks by the Borrowers
         pursuant to Section 3.14.

         "Federal  Funds  Rate"  shall  mean,  for any day,  the rate per  annum
         (rounded  upwards,  if necessary,  to the nearest 1/100 of 1%) equal to
         the  weighted   average  of  the  rates  on  overnight   federal  funds
         transactions  with members of the Federal  Reserve  System  arranged by
         federal funds brokers on such day, as published by the Federal  Reserve
         Bank of Dallas,  Texas,  on the Business Day next  succeeding such day,
         provided that (a) if the day for which such rate is to be determined is
         not a Business  Day, the Federal  Funds Rate for such day shall be such
         rate on such  transactions  on the next  preceding  Business  Day as so
         published on the next succeeding  Business Day, and (b) if such rate is
         not so published for any day, the Federal Funds Rate for such day shall
         be the average rate  charged to Banks on such day on such  transactions
         as determined by the Banks.

         "Financial   Statements"  shall  mean,   collectively,   the  financial
         statements  of  Borrowers,  which  have  been  delivered  to  Banks  in
         connection  with  Borrowers'  application  to Banks for the loans to be
         made by Banks pursuant to this Agreement, and which are to be delivered
         in accordance with the terms and requirements of Section 7.1(e).

         "Fixed Rate Loan" shall mean any LIBO Rate Loan.

         "Floating  Rate"  shall mean an  interest  rate per annum  equal to the
         Index Rate from time to time in effect,  but in no event  exceeding the
         Highest Lawful Rate.

         "Floating  Rate  Loan"  shall  mean  any Loan  and any  portion  of the
         outstanding balance of Borrowers' Loan Account which the Borrowers have
         requested,  in  the  initial  Borrowing  Request  for  such  Loan  or a
         subsequent  Borrowing  Request  for  such  portion  of the  outstanding
         balance of Borrowers' Loan Account, bear interest at the Floating Rate,
         or which  pursuant to the terms  hereof is  otherwise  required to bear
         interest at the Floating Rate.

         "GAAP" shall mean generally accepted accounting principles  established
         by the Financial  Accounting  Standards Board or the American Institute
         of Certified Public Accountants and in effect in the United States from
         time to time,  applied on a basis consistent with that of the preceding
         fiscal  year of Seitel,  reflecting  only such  changes  in  accounting
         principles or practice with which the independent public accountants of
         Seitel concur.




                                       15

<PAGE>



         "General  Intangibles"  shall  mean  all  general  intangibles  of each
         Borrower,  whether now owned or  hereafter  created or acquired by each
         Borrower,  including,  without limitation, all choses in action, causes
         of action,  corporate  or other  business  records,  deposit  accounts,
         inventions,  designs, patents, patent applications,  trademarks,  trade
         names, trade secrets, goodwill,  copyrights,  registrations,  licenses,
         franchises,  rights to royalties,  blueprints,  drawings,  confidential
         information,   catalogs,  sales  literature,  video  tapes,  consulting
         agreements,  employment agreements,  customer lists, tax refund claims,
         computer  programs,  insurance  policies,  deposits with insurers,  all
         claims under guaranties,  security  interests or other security held by
         or granted to each Borrower to secure payment of any of the Accounts by
         an  Account  Debtor,  all  rights  to  indemnification  and  all  other
         intangible property of every kind and nature (other than Accounts).

         "Geophysical  Agreement"  shall  mean  the  Term  Credit  and  Security
         Agreement dated July 15, 1993, between Geophysical and Compass Alabama,
         as amended from time to time.

         "Geophysical   Documents"   shall   mean,   collectively,   the  Seitel
         Geophysical  Guaranty,   the  Geophysical  Note,  and  the  Geophysical
         Agreement, as each may be amended from time to time.

         "Geophysical  Loan" shall mean the  $4,300,000.00  term loan by Compass
         Alabama to Geophysical, as evidenced by the Geophysical Note.

         "Geophysical Note" shall mean the Term Note dated July 15, 1993, in the
         original principal amount of $4,300,000.00, executed by Geophysical and
         made payable to the order of Compass Alabama,  and as may be increased,
         renewed, replaced, substituted, modified, extended, and rearranged from
         time to time.

         "Governmental Authority" shall mean any nation, country,  commonwealth,
         territory, government, state, county, parish, municipality,  agency, or
         other  political  subdivision  and  any  entity  exercising  executive,
         legislative,  judicial,  regulatory,  or administrative functions of or
         pertaining to  government,  including,  without  limitation,  any state
         agencies and Persons  responsible in whole or in part for environmental
         matters in the  states in which any  Borrower  is located or  otherwise
         conducting its business activities and the United States  Environmental
         Protection Agency.

         "Hazardous Substances" shall mean flammables, explosives, radioactive
         materials, hazardous wastes, asbestos, or any



                                       16

<PAGE>



         material containing asbestos,  polychlorinated  biphenyls (PCBs), toxic
         substances  or  related  materials,   petroleum,   petroleum  products,
         associated oil or natural gas exploration,  production, and development
         wastes, or any substances defined as "hazardous substances," "hazardous
         materials,"   "hazardous  wastes,"  or  "toxic  substances"  under  the
         Comprehensive  Environmental Response,  Compensation and Liability Act,
         as  amended,  the  Superfund  Amendments  and  Reauthorization  Act, as
         amended,  the Hazardous Materials  Transportation Act, as amended,  the
         Resource   Conservation  and  Recovery  Act,  as  amended,   the  Toxic
         Substances Control Act, as amended,  or any other law or regulation now
         or hereafter enacted or promulgated by any Governmental Authority.

         "Highest  Lawful Rate" shall mean, on any day, the highest  nonusurious
         rate of  interest,  if any,  permitted  by  applicable  law on such day
         (calculated on the basis of a 365 or 366 day year, as applicable).  For
         purposes of TEX. REV. CIV. STAT. ANN., Art.  5069-1.04,  as it may from
         time  to  time  be  amended,  the  Highest  Lawful  Rate  shall  be the
         "indicated  rate  ceiling"  referred  to in and  determined  under Art.
         5069-1.04(a)(1) from time to time in effect; provided, however, that to
         the extent  permitted by  applicable  law,  Banks  reserve the right to
         change, from time to time by further notice and disclosure to Borrower,
         the  ceiling  on which the  Highest  Lawful  Rate is based  under  Art.
         5069-1.04;  and provided further, that the "highest nonusurious rate of
         interest  permitted by applicable  law" for purposes of this  Agreement
         shall  not be  limited  to  the  applicable  rate  ceiling  under  Art.
         5069-1.04  if  federal  laws or other  state laws now or  hereafter  in
         effect and applicable to this  Agreement  (and the interest  contracted
         for,  charged,  and collected  hereunder) shall permit a higher rate of
         interest.

         "Index Rate" shall mean, on any day, the prime rate as published in The
         Wall Street  Journal's  "Money  Rates"  table for that day. If multiple
         prime  rates are  quoted in such  table,  then the  highest  prime rate
         quoted  therein shall be the Index Rate. In the event that a prime rate
         is not published in the Wall Street Journal's "Money Rates" table, then
         Banks will choose a substitute  Index Rate, for purposes of calculating
         the Applicable  Rate, which is based on comparable  information,  until
         such time as a prime rate is  published  in the Wall  Street  Journal's
         "Money Rates" tables.

         "Insolvency  Proceeding" shall mean application  (whether  voluntary or
         instituted by another  Person) for or the consent to the appointment of
         a receiver,  trustee,  conservator,  custodian,  or  liquidator  of any
         Person or of all or a substantial part of the Property of such Person,



                                       17

<PAGE>



         or the filing of a petition (whether voluntary or instituted by another
         Person)  commencing  a case under Title 11 of the United  States  Code,
         seeking  liquidation,   reorganization,   or  rearrangement  or  taking
         advantage of any  bankruptcy,  insolvency,  debtor's  relief,  or other
         similar  law of the  United  States,  the State of Texas,  or any other
         jurisdiction.

         "Intellectual   Property"  shall  mean  patents,  patent  applications,
         trademarks,   tradenames,   copyrights,   technology,   know-how,   and
         processes.

         "Interest  Period" shall mean,  subject to the limitations set forth in
         Section 3.19,  with respect to any LIBO Rate Loan, a period  commencing
         on the date such Loan is made or converted  from a Loan of another type
         pursuant  to this  Agreement  or the  last  day of the  next  preceding
         Interest Period with respect to such Loan and ending on the numerically
         corresponding  day in the calendar month that is one, two,  three,  or,
         subject to availability,  six months  thereafter,  as the Borrowers may
         request in the Borrowing Request for such Loan.

         "Inventory"  shall mean all of each Borrower's (or other  entity's,  as
         applicable) Seismic Data and other inventory (as defined in the Uniform
         Commercial  Code as  enacted  in the  State of  Texas,  or in any other
         applicable   jurisdiction),   wherever  located,   including,   without
         limitation,  all merchandise and related merchandise and other personal
         property  now owned or  hereafter  acquired by any  Borrower  (or other
         entities,  as  applicable)  which  are held for sale or  lease,  or are
         furnished  or to be  furnished  under a contract  of service or are raw
         materials,  work in process,  or  materials  or supplies  used or to be
         used, or consumed or to be consumed,  in Borrower's (or other entity's,
         as  applicable)  business,  and all  shipping and  packaging  materials
         relating to any of the foregoing.

         "Liabilities"  shall  mean any and all  liabilities,  obligations,  and
         indebtedness of Borrowers  (individually  and  collectively)  and their
         respective  Affiliates  (other  than DDD  Energy,  Inc.,  except  as it
         relates to the Seitel DDD Guaranty) to Banks (or either of them), or to
         any affiliate of either Bank (including Compass Alabama), of every kind
         and description, direct or indirect, absolute or contingent, matured or
         unmatured, primary or secondary,  liquidated or unliquidated, due or to
         become due,  now  existing or hereafter  arising,  and whether  arising
         directly or acquired from others,  regardless  of how such  Liabilities
         arise or by what  agreement  or  instrument  they may be  evidenced  or
         whether the foregoing  Liabilities  include obligations to perform acts
         and refrain from taking actions as well as obligations to pay



                                       18

<PAGE>



         money. Without limiting the foregoing, Liabilities specifically include
         (i)  Borrowers'  joint and several  obligations  evidenced by the Notes
         and/or  those  described  or  referenced  herein,  including,   without
         limitation,  the obligation to repay advances made by Banks pursuant to
         the Revolving Line granted herein, (ii) the liabilities and obligations
         of Geophysical  and any other Person under the  Geophysical  Documents,
         and (iii) the liabilities and obligations of Seitel arising under or in
         connection  with the  Seitel  Geophysical  Guaranty  and the Seitel DDD
         Guaranty.

         "LIBO Rate" shall mean,  with  respect to any  Interest  Period for any
         LIBO Rate Loan, the lesser of (a) the rate per annum (rounded  upwards,
         if  necessary,  to the nearest  1/16 of 1%) equal to the average of the
         offered quotations appearing on Telerate Page 3750 (or if such Telerate
         Page shall not be available,  any successor or similar service selected
         by the Banks and the Borrowers) as of approximately 11:00 a.m., Central
         Standard or Daylight  Savings  Time, as the case may be, on the day one
         Business Day prior to the first day of such Interest  Period for Dollar
         deposits in an amount  comparable to the principal  amount of such LIBO
         Rate Loan and having a term  comparable to the Interest Period for such
         LIBO Rate  Loan,  or (b) the  Highest  Lawful  Rate.  If  neither  such
         Telerate Page 3750 nor any  successor or similar  service is available,
         the term "LIBO Rate" shall mean,  with respect to any  Interest  Period
         for any LIBO Rate Loan,  the lesser of (a) the rate per annum  (rounded
         upwards if necessary, to the nearest 1/16 of 1%) quoted by the Banks at
         approximately  11:00  a.m.,  London  time  (or as  soon  thereafter  as
         practicable)  one  Business  Day prior to the first day of the Interest
         Period for such LIBO Rate Loan for the offering by the Banks to leading
         banks in the London  interbank  market of Dollar  deposits in an amount
         comparable to the principal  amount of such LIBO Rate Loan and having a
         term  comparable to the Interest Period for such LIBO Rate Loan, or (b)
         the Highest Lawful Rate.

         "LIBO Rate Loan" shall mean any Loan and any portion of the outstanding
         balance of Borrowers'  Loan Account which the Borrowers have requested,
         in  the  initial  Borrowing  Request  for  such  Loan  or a  subsequent
         Borrowing  Request  for such  portion  of the  outstanding  balance  of
         Borrowers'  Loan  Account,  bear interest at the Adjusted LIBO Rate and
         which is permitted by the terms hereof to bear interest at the Adjusted
         LIBO Rate.

         "Licensing  Agreement"  shall  mean a  Master  Seismic  Data  Licensing
         Agreement, in substantially the form of Exhibit "F".




                                       19

<PAGE>



         "Lien" shall mean any interest in Property  securing an obligation owed
         to, or a claim  by, a Person  other  than the  owner of such  Property,
         whether such interest is based on common law, statute, or contract, and
         including,  but not limited to, the lien or security  interest  arising
         from  a  mortgage,   ship  mortgage,   encumbrance,   pledge,  security
         agreement,  conditional sale or trust receipt, or a lease, consignment,
         or  bailment  for  security  purposes  (other  than true leases or true
         consignments),  liens of mechanics, materialmen, and artisans, maritime
         liens and reservations, exceptions, encroachments, easements, rights of
         way,  covenants,  conditions,  restrictions,  leases,  and other  title
         exceptions  and  encumbrances   affecting   Property  which  secure  an
         obligation  owed to,  or a claim by, a Person  other  than the owner of
         such Property (for the purpose of this  Agreement,  the Borrowers shall
         be deemed  to be the owner of any  Property  which it has  acquired  or
         holds subject to a conditional  sale  agreement,  financing  lease,  or
         other  arrangement  pursuant  to which title to the  Property  has been
         retained by or vested in some other Person for security purposes),  and
         the filing or recording of any  financing  statement or other  security
         instrument in any public office.

         "Limitation  Period"  shall  mean any period  while any amount  remains
         owing on either of the Notes and interest on such amount, calculated at
         the applicable interest rate, plus any fees or other sums payable under
         any Credit  Document and deemed to be interest  under  applicable  law,
         would  exceed the amount of interest  which would accrue at the Highest
         Lawful Rate.

         "Loan"  shall mean any  advance  made by any of the Banks to or for the
         benefit of the Borrowers pursuant to this Agreement.

         "Lockbox" shall mean Post Office Box 4309,  Houston,  Texas 77210-4309,
         established by Borrowers  pursuant to Section 6.1, to which all Account
         Debtors shall be directed to make remittance, either by mail or by wire
         transfer.

         "Lockbox Agreement" shall mean the lockbox agreement between Seitel and
         Compass   relating  to  the  Lockbox,   being  in  form  and  substance
         satisfactory  to  Banks,  as the  same  may be  amended,  restated,  or
         supplemented from time to time.

         "Material  Adverse Change" shall mean any act,  circumstance,  or event
         (including,  without limitation,  any announcement of action) which (a)
         causes an Event of Default,  (b) otherwise could reasonably be expected
         to be material and adverse to the financial  condition or operations of
         any Borrowers  (individually  and  collectively),  or (c) in any manner
         could reasonably be



                                       20

<PAGE>



         expected to materially and adversely affect the validity
         or enforceability of any Credit Document.

         "Multiemployer Plan" shall mean a Plan which is a multiemployer plan as
         defined in Section 4001(a)(3) of ERISA.

         "Net Income" shall mean, for any period, the net income of Seitel, on a
         consolidated basis, for such period determined in accordance with GAAP.

         "Net Worth" shall be defined and calculated in accordance with GAAP.

         "Notes" shall mean, collectively, the Bank One Note and the Compass
         Note.

         "Offshore Account" shall mean each Account that is due to Offshore.

         "Participation  Agreement"  shall  mean a  Master  Data  and  Licensing
         Agreement, in substantially the form of Exhibit "G".

         "Permitted  Liens"  shall  mean any of the  following  (but only to the
         extent  the same do not or could  not,  in Banks'  reasonable  opinion,
         jeopardize  Banks' or  Agent's,  for the  benefit  of Banks,  rights or
         priority in or to any Collateral):

                (a)    Liens of carriers,  warehousemen,  landlords,  mechanics,
                       laborers  and  materialmen  arising by law for sums which
                       are (i) not yet due or (ii) being diligently contested in
                       good faith and with respect to which  Borrowers  have set
                       aside sufficient reserves;

                (b)    Liens for taxes  which are (i) not yet due or (ii)  being
                       diligently   contested  in  good  faith  by   appropriate
                       proceedings  and with respect to which Borrowers have set
                       aside sufficient reserves;

                (c)    security  interests in any  Borrower's  Equipment  (other
                       than   Equipment   constituting    collateral   for   the
                       Geophysical Loan or equipment  constituting Seismic Data,
                       if  any),  provided  that  such  security  interests  are
                       limited to those securing a portion of the purchase price
                       of  said  Equipment,   and  further  provided  that  such
                       security interests secure indebtedness and other 



                                       21

<PAGE>



                      obligations permitted under Section 8.1(l);

                (e)    pledges  or  deposits  in  connection  with or to  secure
                       worker's compensation or unemployment insurance;

                (f)    security   interests  or  lessor's  interests  in  up  to
                       $350,000.00  worth of computer  work stations and related
                       equipment to be purchased or leased by Borrowers or their
                       Affiliates  within six  months  after the  Closing  Date,
                       which security interests secure a portion of the purchase
                       price of such  equipment  or  which  leases  are  secured
                       solely by the lessor's interest in such equipment;

                (g)    Geo Seismic  Services,  Inc.'s  security  interest in the
                       Assets (as that term is defined in the letter from Seitel
                       to Compass Alabama dated October 14, 1992 (the "Letter"),
                       purchased from Geo Seismic Services, Inc. but only to the
                       extent described in and permitted by the Letter;

                (h)    security  interest in favor of Compass in the  Collateral
                       securing the Geophysical Loan;

                (i)   lessor's  interests  in up to  $5,700,000.00  worth of (a)
                      Opseis  Eagle  seismic data  gathering  system and related
                      equipment leased by Geophysical (the "Opseis Eagle
                                                            ------------
                      Lease"), and (b) trucks and related
                      -----
                      equipment, and computer and related equipment and software
                      leased by any Borrower  prior to the Closing  Date,  which
                      leases are secured solely by the lessor's interest in such
                      equipment and software;

               (j)    security interests in favor of PGS Exploration (US), Inc.,
                      formerly  known as  Precision  Seismic,  Inc.,  under that
                      certain  Security  Agreement,  a copy of which is attached
                      hereto  as  Exhibit  "H"  (the   "Precision   Agreement");
                      provided it                       -------------------
                      is  expressly  understood  and agreed  (i) any  default or
                      event of  default  under the  Precision  Agreement  or any
                      documents   executed   in   connection   therewith   shall
                      constitute an Event of Default,  and (ii) the  Obligations
                      (as defined in the Precision Agreement) shall in no event



                                       22

<PAGE>



                      exceed  $2,500,000.00 at any time  outstanding,  and (iii)
                      the  Inventory of Seismic  covered by and described in the
                      Precision   Agreement  shall  only   constitute   Eligible
                      Inventory  if and  to the  extent  the  security  interest
                      granted in the  Precision  Agreement  is  subordinated  to
                      Banks' security interest therein, in a manner satisfactory
                      to the Banks; and

               (k)    security  interests  in  real  property  and  improvements
                      thereon granted by Polymer Dynamics,  Inc. to secure up to
                      $350,000.00 of  indebtedness  incurred in connection  with
                      the  acquisition  and  improvements  thereto  of such real
                      property.

         "Person" shall mean any  individual,  corporation,  partnership,  joint
         venture,  association,   joint  stock  company,  trust,  unincorporated
         organization,   government  or  any  agency  or  political  subdivision
         thereof, or any other form of entity.

         "Plan"  shall mean,  at any time,  any  employee  benefit plan which is
         covered by ERISA and in respect of which the  Borrowers or any Commonly
         Controlled  Entity is (or, if such plan were  terminated  at such time,
         would under  Section  4069 of ERISA be deemed to be) an  "employer"  as
         defined in Section 3(5) of ERISA.

         "Pledged  Stock" shall mean all of the issued and  outstanding  capital
         stock  of all  wholly-owned  Subsidiaries  of  Seitel  (other  than DDD
         Energy, Inc.).

         "Principal  Office"  shall  mean the  principal  office of the Agent in
         Houston, Texas, presently located at 24 Greenway Plaza, Houston, Texas
         77046.

         "Prior  Loan  Agreement"  shall  mean the Master  Revolving  Credit and
         Security  Agreement dated effective  February 28, 1994, among Bank One,
         Compass Alabama, and certain of the Borrowers,  as amended from time to
         time,  and any  other  heretofore  entered  into  written  or oral loan
         agreement among Borrowers and Banks (or any  predecessor),  and any and
         all amendments and modifications of any of the foregoing.

         "Prior Security  Agreements" shall mean,  collectively,  (a) the Pledge
         Agreement dated effective as of February 28, 1994, from Seitel in favor
         of  Compass  Alabama  and Bank One,  covering  and  granting a security
         interest in, among other  things,  the Pledged  Stock,  as amended from
         time to time, (b) the Geophysical Documents, (c) the Security Agreement
         (Joint Venture Interest) dated as of May 19,



                                       23

<PAGE>



         1994, among Compass Alabama,  Bank One, and Offshore,  covering,  among
         other things,  Offshore's joint venture interest in and to Digitel, and
         (d)  any  and  all  other  security  agreements  and  other  collateral
         instruments  heretofore  entered into by and among  Borrowers and Banks
         and their  respective  predecessors  in interest.  Compass  Alabama has
         assigned  its rights and  obligations,  in its capacity as agent and in
         its  capacity  as a  lender,  under the Prior  Security  Agreements  to
         Compass,  and as a result  thereof,  Compass is  entitled to all of the
         rights and  privileges  provided to Compass  Alabama  under each of the
         Prior Security Agreements.

         "Proceeds"  shall mean all forms of payment  received  by or due to any
         Borrower from the collection of Accounts or sale, exchange, collection,
         or  other  disposition  of  Inventory  or other  property  constituting
         Collateral hereunder and any and all claims against any third party for
         loss or damage  to any  Collateral,  including  insurance  claims,  and
         further,  without  limiting the generality of the  foregoing,  Proceeds
         shall include all Accounts, checks, cash, money orders, drafts, chattel
         paper,  instruments,  notes,  or  other  documents  evidencing  payment
         obligations to any Borrower for sale or exchange of Collateral.

         "Property"  shall mean any  interest  in any kind of property or asset,
         whether real, personal or mixed, tangible or intangible.

         "Regulation D" shall mean Regulation D of the Board of Governors of the
         Federal Reserve System, as the same may be amended or supplemented from
         time to time.

         "Regulatory Change" shall mean the passage, adoption,  institution,  or
         amendment of any federal,  state,  local, or foreign Requirement of Law
         (including,  without limitation,  Regulation D), or any interpretation,
         directive,  or request  (whether or not having the force of law) of any
         Governmental   Authority  or  monetary   authority   charged  with  the
         enforcement, interpretation, or administration thereof, occurring after
         the Closing Date and applying to a class of banks  including any of the
         Banks;  provided,  however,  that a change in any Requirement of Law or
         any interpretation, directive or request with respect to taxes assessed
         on the basis of income of the Banks shall not be a Regulatory Change.

         "Release  of  Hazardous  Substances"  shall mean any  emission,  spill,
         release,  disposal,  or discharge,  except in  accordance  with a valid
         permit, license,  certificate, or approval of the relevant Governmental
         Authority,  of any  Hazardous  Substance  into or upon (a) the air, (b)
         soils or any improvements located thereon, (c) surface



                                       24

<PAGE>



         water or groundwater,  or (d) the sewer or septic system,  or the waste
         treatment,  storage,  or disposal system  servicing any Property of the
         Borrowers.

         "Remittances Account" shall mean account No. 30052795 of Seitel (or any
         other  account)  established  with Agent  pursuant  to  Section  6.1 in
         association  with the  Lockbox and to which  Borrowers  and Agent shall
         have  access  by way of  draft,  check,  wire  transfer  of  funds,  or
         otherwise to the extent specified in Section 6.1.

         "Required  Banks"  shall mean the Bank  serving as the Agent,  together
         with such other Banks as necessary to make the  Commitment  Percentages
         for all such Banks total 100%.

         "Requirement  of Law" shall mean, as to any Person,  the certificate or
         articles  of  incorporation  and  by-laws  or other  organizational  or
         governing  documents of such Person,  and any applicable  law,  treaty,
         ordinance,  order, judgment, rule, decree, regulation, or determination
         of an arbitrator,  court, or other Governmental  Authority,  including,
         without limitation, rules, decrees, judgments, regulations, orders, and
         requirements  for  permits,  licenses,  registrations,   approvals,  or
         authorizations  (and  any  authoritative  interpretation  of any of the
         foregoing),  in each case as such now exist or may be hereafter amended
         and  are  applicable  to or  binding  upon  such  Person  or any of its
         Property or to which such Person or any of its Property is subject.

         "Responsible Officer" shall mean, as to any Borrower, its
         President, Chief Executive Officer, Chief Financial
         Officer, and Chief Accounting Officer.

         "Seismic  Data" shall mean all seismic  data,  seismic data library and
         related books, records, materials,  information, files, correspondence,
         contracts,   rights  and  property;   together   with  all   associated
         Intellectual  Property,   including,   without  limitation,   computer,
         magnetic,  and  microfiche  hardware and  software,  and related  maps,
         charts,  reports,  tapes, discs, programs,  information,  compilations,
         licenses, patents, trademarks, copyrights (in all seismic data, seismic
         materials information, project files and other similar items), together
         with  all   applications   for  the   registration   thereof   and  all
         registrations  obtained therefor, and all renewals and/or extensions of
         any  such  copyrights,   copyright  registration   applications  and/or
         copyright  registrations  and the  right to sue for past,  present  and
         future  infringements   thereof,   all  rights  corresponding   thereto
         throughout  the world,  and all  proceeds of the  foregoing,  including
         licenses,  royalties  and  proceeds  of suit,  and all further or other
         property which to the



                                       25

<PAGE>



         extent that the same pertains or relates to or emanates or derives from
         any  copyright  and/or  the  ownership,   use,  possession,   transfer,
         licensing (whether as licensor or licensee) and/or other disposition of
         any such copyright and/or embodies or incorporates  any copyright,  and
         all proceeds  (whether  cash or  non-cash),  products,  rents,  issues,
         royalties,  profits and returns of and from any of the  foregoing,  and
         all related rights and property.

         "Seitel  DDD  Guaranty"  shall mean the  Guaranty,  executed  by Seitel
         guaranteeing  the payment and  performance  of the  Obligations  of DDD
         Energy,  Inc.  under and with respect to the DDD Credit  Agreement,  as
         such Guaranty shall be amended,  supplemented  or restated from time to
         time.

         "Seitel  Geophysical  Guaranty"  shall mean the Continuing  (Unlimited)
         Guaranty dated July 15, 1993,  executed by Seitel,  in connection  with
         the Geophysical  Loan, as such Guaranty shall be amended,  supplemented
         or restated from time to time.

         "Single Employer Plan" shall mean any Plan which is covered by Title IV
         of ERISA, but which is not a Multiemployer Plan.

         "Subordinated  Debt" shall mean the  aggregate  outstanding  balance of
         Seitel's existing 9% convertible  subordinated  debentures due in 2002,
         as heretofore disclosed to Banks in writing.

         "Subsidiary"  shall mean,  as to any  Person,  a  corporation  of which
         shares of stock having  ordinary  voting power (other than stock having
         such power only by reason of the happening of a contingency) to elect a
         majority  of  the  board  of  directors  or  other   managers  of  such
         corporation  are at the  time  owned,  or the  management  of  which is
         otherwise  controlled,  directly  or  indirectly  through  one or  more
         intermediaries, or both, by such Person.

         "Superfund  Site"  shall mean those sites  listed on the  Environmental
         Protection  Agency  National  Priority  List and  eligible for remedial
         action or any comparable  state  registries or list in any state of the
         United States.

         "Tangible  Net Worth" shall mean (a) Seitel's  consolidated  Net Worth,
         plus  (b) the  Subordinated  Debt,  less (c) the sum of (i) any and all
         unconsolidated   loans  and  other   advances   to   Affiliates,   (ii)
         unconsolidated notes, notes receivable,  accounts, accounts receivable,
         inter-company  receivables,  and other amounts  owing from  Affiliates,
         (iii) treasury stock, goodwill,  trademarks, trade names, franchise, or
         license agreements, patents, and deferred charges, and (iv) any and all
         other intangible assets.  For purposes of this Agreement,  the tangible
         net worth of



                                       26

<PAGE>



          DDD Energy,  Inc. and loans,  advances,  and  investments by Borrowers
          (individually  and  collectively) in and to DDD Energy,  Inc. shall be
          excluded from the  calculation of Seitel's  consolidated  Tangible Net
          Worth.

         "UCC"  shall mean the Uniform  Commercial  Code as from time to time in
         effect in the State of Texas.

         "Underlying  Digitel  Account"  shall  mean  any and all  accounts  and
         accounts receivable owing to Digitel.

              1.2  Accounting  Terms.  All  accounting  terms  not  specifically
defined herein shall be construed in accordance  with GAAP  consistent with such
principles. In the event that changes in GAAP shall be mandated by the Financial
Accounting  Standards  Board and/or the American  Institute of Certified  Public
Accountants or any similar accounting body of comparable  standing,  or shall be
recommended by Borrower's certified public accountants,  to the extent that such
changes would modify such accounting terms or the  interpretation or computation
thereof as contemplated by this Agreement at the time of execution hereof,  then
in such event,  such changes shall be followed in defining such accounting terms
only after Banks and  Borrowers  amend this  Agreement  to reflect the  original
intent of such terms in light of such changes,  and such terms shall continue to
be applied and interpreted without such change until such agreement.

              1.3     Other Terms.  All other terms contained in this
Agreement shall have, when the context so indicates, the meanings
provided for in the UCC to the extent the same are used or defined
therein.

              1.4 References. References in this Agreement to Section or Exhibit
numbers shall be to Sections and Exhibits of this  Agreement,  unless  expressly
stated to the  contrary.  References  in this  Agreement to "hereby,"  "herein,"
"hereinabove,"  "hereinafter," "hereinbelow," "hereof," and "hereunder" shall be
to this  Agreement  in its entirety  and not only to the  particular  Section or
Exhibit in which such reference appears.

              1.5 Sections.  This  Agreement,  for  convenience  only,  has been
divided  into  Sections;  and it is  understood  that the rights and other legal
relations of the parties hereto shall be determined  from this  instrument as an
entirety and without regard to the aforesaid  division into Sections and without
regard to headings prefixed to such Sections.

              1.6 Number and Gender.  Whenever the context  requires,  reference
herein made to the single number shall be understood to include the plural;  and
likewise, the plural shall be understood to include the singular. Definitions of
terms  defined in the  singular  or plural  shall be equally  applicable  to the
plural  or  singular,  as the case may be,  unless  otherwise  indicated.  Words
denoting sex shall be construed to include the masculine, feminine and neuter,



                                       27

<PAGE>



when such  construction  is  appropriate;  and  specific  enumeration  shall not
exclude the general but shall be construed as cumulative.

              1.7     Incorporation of Exhibits.  The Exhibits attached to
this Agreement are incorporated herein and shall be considered a
part of this Agreement for all purposes.

              1.8 Certain  Other  Matters of  Construction.  All  references  to
statutes and related  regulations  shall include any  amendments of same and any
successor  statutes  and  regulations.  All  references  to any  instruments  or
agreements,  including,  without  limitation,  references  to any of the  Credit
Documents, shall include any and all modifications or amendments thereto and any
and all extensions or renewals thereof.

                                   SECTION 2
                              CONDITIONS PRECEDENT

              2.1 Conditions Precedent to Initial Advance.  Subject to the terms
and  provisions  of Section 2.2, the  obligation  of Banks to make their initial
advance hereunder is subject to the Banks' receipt, review, and approval of each
of  the  following  documents  and  other  items,  appropriately  executed  when
necessary and, where applicable, acknowledged by one or more authorized officers
of  Borrowers,  all in form and substance  satisfactory  to the Banks and dated,
where  applicable,  of even date herewith or a date prior thereto and acceptable
to the Banks:

               (a)    each of the Credit Documents, in properly executed
         form, and in as many counterparts as required by Banks;

               (b)    the certificate of incorporation, articles of
         incorporation, and bylaws of each Borrower, together with
         any and all modifications thereof as of the date hereof;

               (c) all Certificates of Authority,  Certificates of Good Standing
         (or such other evidence as is satisfactory to Banks) that each Borrower
         is in good standing in the State of Texas and all other states required
         by  Banks,  Certificates  of  Existence,  borrowing  resolutions  (with
         secretary's certificate),  Secretary's Certificates of Incumbency,  and
         all other documents  required by Banks to evidence  Borrowers and their
         respective  representatives  are empowered and duly authorized to enter
         into the agreements evidenced by the Credit Documents;

               (d)    copies of all insurance policies required by this
         Agreement;

               (e) results of a search of the UCC records of the Texas Secretary
         of State and such other states as are required by Banks,  from a source
         acceptable  to each Bank,  reflecting  no security  interests and liens
         against any



                                       28

<PAGE>



         Collateral as to which perfection is accomplished by the
         filing of a financing statement in favor of Banks;

               (f)    a Borrowing Base Report dated as of the date of
         this Agreement;

               (g) an opinion of counsel  of  Borrowers,  in form and  substance
         satisfactory to each Bank, stating,  among other things, that Borrowers
         are each  authorized to enter into this  Agreement and the other Credit
         Documents  executed by each  Borrower and this  Agreement and the other
         Credit Documents constitute legally binding and enforceable obligations
         of Borrowers;

               (h) if required  by Banks,  a copy of this  Agreement  shall have
         been  filed  with an  appropriate  filing  officer  under  the  Federal
         Copyright Act and/or the Federal Patent Act; and

               (i) such  certificates  and documents  reflecting the solvency of
         each Borrower, after giving effect to the transactions  contemplated by
         this  Agreement,  as Banks shall require and find  acceptable,  showing
         that each  Borrower  is  solvent  or not so  undercapitalized  as to be
         unable to pay their respective debts as they become due.

                 2.2 Conditions Precedent to Each Loan. The obligations of Banks
under  this  Agreement  to  make  any  advances  or  payments  under  the  Notes
(including, without limitation, the initial advance as provided in Section 2.1),
in accordance with the terms and provisions of Section 3 of this Agreement,  are
subject  to the  full  and  complete  satisfaction  of  each  of  the  following
conditions precedent as of the date of such advance or payment:

                  (a) Seitel,  on behalf of the Borrowers,  shall have delivered
         to the Agent a Borrowing  Request at least the requisite  time prior to
         the  requested  date  for the  relevant  Loan,  and each  statement  or
         certification made in such Borrowing Request, shall be true and correct
         in all material respects on the requested date for such Loan;  provided
         that,  unless  required by Banks,  no  Borrowing  Base  Request will be
         required in connection with Loans made pursuant to Section 3.6(a);

                  (b) if  requested  by either Bank,  the  Borrowers  shall have
         delivered evidence  satisfactory to the requesting Bank  substantiating
         any of the matters  contained in this Agreement  which are necessary to
         enable the Borrowers to qualify for such Loan;

                   (c) no event shall have  occurred  which,  in the  reasonable
         opinion of either Bank, has or could  reasonably be expected to cause a
         Material Adverse Change;



                                       29

<PAGE>




                  (d) the Banks shall have received, reviewed, and approved such
         additional  documents  and items as may be  requested by the Banks with
         respect to such Loan;

                  (e) all of the Credit Documents shall be in full
         force and effect and provide to the Banks the security
         intended thereby;

                  (f) the consummation of the transactions
         contemplated hereby shall not contravene, violate, or
         conflict with any Requirement of Law;

                  (g) the Borrowers  (individually or  collectively)  shall hold
         full legal title to the  Collateral  and be the sole  beneficial  owner
         thereof;

                  (h) The  representations and warranties set forth in Section 4
         of this  Agreement  shall  be true  and  correct  as of the date of the
         making of such  advance  or  payment  with the  effect  as  though  the
         representation or warranty had been made on this date;

                  (i)      No Default or Event of Default shall have
         occurred, or will result from, the making of such
         advance;

                  (j) All  requirements  for making the first  advance under the
         Notes in  accordance  with the terms and  provisions  of Section 2.1 of
         this Agreement shall then be fully and completely satisfied (including,
         without limitation,  any requirement set forth in Section 2.1 which was
         waived  in  connection  with  the  initial  advance  or any  subsequent
         advance);

                  (k) The Agent shall have  received the payment of all Facility
         Fees and other  fees and  reimbursements  then due and  payable  to the
         Agent and/or the Banks hereunder; and

                  (l) All of the  foregoing  and  all  matters  incident  to the
         consummation  of  the  transactions   hereby   contemplated   shall  be
         satisfactory to the Agent and each of the Banks.

                                   SECTION 3
                       BANKS' AGREEMENT TO MAKE ADVANCES

                 3.1 Revolving  Line. (a) Subject to the terms and conditions of
this  Agreement,  relying on the  representations  of Borrowers  hereinafter set
forth,  during the Commitment Period,  Banks, acting through the Agent, agree to
extend  to  Borrowers  an  open-end  revolving  credit  line  pursuant  to which
Borrowers  may borrow,  repay,  and reborrow  under the terms of this  Agreement
amounts not exceeding at any one time outstanding the aggregate



                                       30

<PAGE>



principal amount equal to the Commitment Amount,  which revolving loan shall, as
of the Closing Date, be evidenced by the  issuance,  execution,  and delivery of
the Notes. If at any time, prior to the Commitment  Termination Date,  Borrowers
are not  entitled to any  advances  or payments by the terms of this  Agreement,
notwithstand-ing the terms elsewhere in this Agreement, Agent, with the approval
of the Required  Banks,  may make  requested  advances and  payments;  provided,
however, it is expressly  acknowledged and agreed that, in such event, Agent and
Banks  shall have the right,  in their sole  discretion,  to decline to make any
such requested  advance or payment and to demand any payment required under, and
otherwise to enforce, any applicable term of this Agreement and the other Credit
Documents  without  prior  notice  to any  Borrower  and the  making of any such
advances and payments  shall not be construed as a waiver of such right by Agent
and Banks.

                  (b)  Subject  to the  terms  of  this  Agreement,  during  the
Commitment Period,  Borrowers may borrow,  repay, and reborrow and convert Loans
of one type or with one  Interest  Period  into Loans of another  type or with a
different Interest Period.  Except for prepayments made pursuant to Section 3.3,
each  borrowing  under Section  3.6(b),  and prepayment of principal of Floating
Rate Loans, shall be in an amount at least equal to $50,000.00.  Each borrowing,
prepayment,  or conversion of or into a Loan of a different type or, in the case
of a Fixed Rate Loan,  having a  different  Interest  Period,  shall be deemed a
separate  borrowing,  conversion,  and prepayment for purposes of the foregoing,
one for each type of Loan or Interest Period.  Anything in this Agreement to the
contrary  notwithstanding,  the  aggregate  principal  amount of LIBO Rate Loans
having the same Interest Period shall be at least equal to  $100,000.00;  and if
any LIBO Rate Loan  would  otherwise  be in a lesser  principal  amount  for any
period, such Loan shall be a Floating Rate Loan during such period.

                  (c) The Loans shall be made and maintained at the
Principal Office.

                  (d) Borrowers  (individually and  collectively)  designate and
appoint Seitel as their  representative for all purposes  hereunder,  and unless
otherwise notified in writing by all Borrowers,  Seitel shall be the sole entity
authorized  to request  advances  under and with respect to the  Revolving  Line
pursuant  to  Section  3.6(b)  and to  direct  the  Agent  with  respect  to the
application of such  advances.  Advances of funds under the Revolving Line shall
be made by Agent to Seitel for and on behalf of all of the Borrowers (except for
advances  to control  disbursement  accounts  owned by  Geophysical  pursuant to
Section 3.6(a), which shall be made to Geophysical on behalf of all Borrowers).

                  (e) Notwithstanding  anything to the contrary herein, from and
including the effective date of this Agreement through,  but not including,  the
Closing Date, advances shall be made under and in



                                       31

<PAGE>



accordance with the terms and provisions of the Prior Loan
Agreement.

                 3.2 Borrowers' Loan Account. Each time an advance is made under
the Revolving  Line against the Notes as provided for herein,  each Bank (acting
through  Agent) shall and is  authorized  to make an  appropriate  entry of such
advance as a debit to  Borrowers'  Loan  Account.  Agent  also  shall  record in
Borrowers'  Loan Account  other  charges,  fees,  expenses,  and items  properly
chargeable to Borrowers hereunder,  all payments made by Borrowers (individually
and  collectively) on account of indebtedness  hereunder,  and other appropriate
debits and credits.  The debit balance of Borrowers'  Loan Account shall reflect
the aggregate  amount of Borrowers'  indebtedness  under the Revolving  Line and
this Agreement from time to time existing  hereunder.  At least once each month,
Agent shall  render a statement of account for  Borrowers'  Loan  Account.  Such
statement shall be considered correct and accepted by Borrowers and conclusively
binding  upon  Borrowers,  except to the extent  that  Agent  receives a written
notice of Borrowers'  exceptions within one hundred twenty (120) days after such
statement  has been  mailed  by  ordinary  mail to  Seitel  for and on behalf of
Borrowers.  Notwithstanding  the  foregoing,  no  failure  by Agent to  properly
reflect any advance actually made or any such charge,  expense, or item actually
incurred in Borrowers'  Loan Account,  or to otherwise  discharge its obligation
under this  Section,  shall  relieve or affect  Borrowers  from their  joint and
several  obligation  to pay all  amounts  advanced  by Banks under the Notes and
otherwise pursuant to this Agreement.

                 3.3  Additional  Payments.  If, at any time  after the  Closing
Date, the outstanding  balance of Borrowers' Loan Account exceeds the Commitment
Amount, Borrowers shall (within 2 Business Days) remit to Agent good funds, in a
timely manner,  sufficient to eliminate such excess.  If Borrowers fail to remit
to Agent good funds,  in a timely  manner,  sufficient to eliminate such excess,
Agent may,  without  notice to or demand on  Borrowers,  at  Agent's  option (in
addition to and without  waiving any and all other  rights and remedies of Banks
and Agent) apply  against such excess (a) any  collections  on and Proceeds from
Accounts or other  Collateral  forwarded to Agent and/or in Agent's  possession;
(b) any other  Property of Borrowers  and the Proceeds  thereof now or hereafter
held  by  Agent  (whether  for  safekeeping,   custody,  pledge,   transmission,
collection or otherwise); and (c) any of Borrowers' deposit balances (general or
special) and credits with Agent.  Borrowers shall pay to Agent on the Commitment
Termination Date the aggregate amount in Borrowers' Loan Account at the close of
business on the Commitment Termination Date.

                 3.4 Post Maturity Advances.  Without limiting any other term or
provision of this Agreement, Agent, in its sole discretion and with the approval
of the Required Banks,  may agree to make requested  advances and payments after
the Commitment  Termination  Date (which advances and payments shall be treated,
for purposes of this Agreement, as advances made prior to the Commitment



                                       32

<PAGE>



Termination  Date);  however,  it is expressly  acknowledged and agreed that, in
such event,  Agent,  with the approval of the Required Banks,  shall  thereafter
have the right, in its sole discretion, to decline to make any further requested
advance after the Commitment Termination Date and may require payment in full of
Borrowers'  Loan Account without prior notice to Borrowers and the making of any
such advances after the Commitment  Termination Date shall not be construed as a
waiver of such right by Agent.

                 3.5 Borrowing  Base.  The Borrowing Base shall be determined on
the basis of  information  supplied by Seitel,  on behalf of  Borrowers,  in the
Borrowing  Base  Report  in  accordance   with  the  terms  of  this  Agreement.
Notwithstanding  the  foregoing,  Agent  shall  have the right to  request  such
further  information  from  Borrowers with respect to the  determination  of the
Borrowing Base as Agent may deem necessary.  Within 15 days after its receipt of
(a) monthly  Borrowing Base Report (or a revised Borrowing Base Report submitted
pursuant to the terms hereof), and (b) any additional  information  requested by
any Bank in connection with either such Bank's review of any such Borrowing Base
Report,  Agent,  at the  request  of any Bank,  may  notify  Borrowers  that the
Borrowing  Base as  calculated  by Borrowers in the  particular  Borrowing  Base
Report  is  incorrect  in any way,  and  Agent  shall  so  notify  Borrowers  to
recalculate  the  Borrowing  Base in  order  that it is  acceptable  to Banks (a
revised  Borrowing Base Report shall then be submitted by Borrower to Agent). If
Agent does not provide  Borrowers  with timely  notice of an error in Borrowers'
calculation  of the Borrowing  Base in a Borrowing  Base Report,  the Borrowers'
calculation  shall be deemed correct until and unless otherwise  notified by the
Agent,  and the  Borrowing  Base shall be the Borrowing  Base  reflected in such
Borrowing Base Report.

                 3.6 Borrowing Procedure for Notes. (a) Subject to the terms and
provisions of this Agreement,  the Lockbox  Agreement,  and all other applicable
cash management agreements entered into by and among Borrowers and Agent (or any
affiliate or Agent),  all checks and other items of  Borrowers  drawn on control
disbursement  account numbers 701-8319-6 (Seitel Operating Account),  701-8323-4
(Geophysical),  701-8324-2 (Seitel),  701-8325-0  (Geophysical),  and 701-8329-9
(Seitel),  each located at Compass Bank, Pensacola,  Florida, and presented to a
duly authorized  representative of Agent shall be paid by Agent. Each payment by
Agent  shall  constitute  an advance on the Notes.  Agent  shall have no duty or
obligation hereunder to pay any checks or other items presented pursuant to this
subsection  which,  as a result of such  payment,  would  cause the  balance  of
Borrowers'  Loan  Account  to  exceed  the  Commitment  Amount.  Except  for any
applicable  Requirement of Law, Agent shall have no duty or obligation hereunder
to investigate the validity of any check or item presented,  except as expressly
provided for in the Lockbox Agreement or in any other applicable cash management
agreement entered into by and between any or all of Borrowers and Banks or Agent
(or any affiliate of such Banks or Agent).




                                       33

<PAGE>



                  (b) In addition to the terms and provisions of subsection (a),
but subject to the terms and  provisions of this  Agreement  (including the full
and complete  satisfaction  of the conditions  listed in Section 2), Seitel,  on
behalf of Borrowers,  may request  advances  under the Notes directly from Agent
pursuant to a Borrowing  Request  submitted and received in accordance  with the
terms and  provisions  of this  Agreement.  Agent,  at its option,  and with the
consent of the Required  Banks,  may accept  telephonic  requests for  advances,
provided that such acceptance shall not constitute a waiver of the Agent's right
to delivery of a Borrowing  Request in connection with  subsequent  advances and
further provided that all such telephonic requests are immediately  confirmed by
Seitel,  on behalf of Borrowers,  in writing by submitting a Borrowing  Request,
whether by facsimile or otherwise.  Not later than 2:00 p.m., Texas time, on the
date specified in the relevant  Borrowing Request or by telephonic request made,
confirmed, and accepted by Agent as set forth in the preceding sentence for each
advance  hereunder,  subject  to the  terms  and  conditions  of this  Agreement
(including, without limitation, that no Default or Event of Default has occurred
and is then  existing and that no  representation  or warranty set forth in this
Agreement is then false or untrue),  Agent shall make such advances available to
Seitel, on behalf of Borrowers, by depositing the same, in immediately available
funds,  in an account of  Borrowers,  or any of them  (designated  by Borrowers)
maintained  with  Agent,  or by such other means as is  acceptable  to Agent and
Borrowers.

                 3.7       Purpose.  All funds borrowed pursuant to this
Agreement shall be used for working capital and general corporate
purposes.

                 3.8   Interest.   Subject  to  the  terms  of  this   Agreement
(including,  without  limitation,  Section  3.17),  interest  on the Loans shall
accrue and be payable  during the  Commitment  Period (and after the  Commitment
Period to the extent  there are any amounts  outstanding  on and with respect to
the Loans) at a rate per annum equal to the Floating Rate for each Floating Rate
Loan and the  Adjusted  LIBO  Rate for each  LIBO  Rate  Loan.  Interest  on all
Floating  Rate Loans shall be  computed on the basis of a year of 360 days,  and
actual days elapsed  (including the first day but excluding the last day) during
the period for which payable.  Interest on all LIBO Rate Loans shall be computed
on the basis of a year of 360 days, and actual days elapsed (including the first
day but  excluding  the last day)  during the period for which  payable.  In the
event that the Borrowers fail to select the duration of any Interest  Period for
any Fixed Rate Loan within the time  period and  otherwise  as provided  herein,
such Loan (if outstanding as a Fixed Rate Loan) will be automatically  converted
into a Floating  Rate Loan on the last day of the then current  Interest  Period
for such Loan or (if outstanding as a Floating Rate Loan) will remain as, or (if
not then  outstanding)  will be made as, a Floating Rate Loan.  Without limiting
any term or  condition  provided  for  herein,  until  prepaid or  converted  in
accordance with this Agreement, all advances under the Revolving Line, made



                                       34

<PAGE>



pursuant to Section  3.6(a),  shall  accrue  interest  as a Floating  Rate Loan.
Interest  provided  for  herein  shall be  calculated  on unpaid  sums  actually
advanced and  outstanding  pursuant to the terms of this  Agreement and only for
the  period  from  the  date  or  dates  of  such  advances   until   repayment.
Notwithstanding  any of the foregoing or anything  else to the contrary  herein,
prior to the Closing  Date,  interest on the Loans shall  accrue as provided for
and in accordance with the terms of the Prior Loan Agreement.

                 3.9  Repayment  of  Loans  and  Interest.  Accrued  and  unpaid
interest on each outstanding Floating Rate Loan shall be due and payable monthly
commencing on the 1st day of May,  1995,  and  continuing on the 1st day of each
calendar month thereafter while any Floating Rate Loan remains outstanding,  the
payment in each  instance  to be the amount of  interest  which has  accrued and
remains unpaid in respect of the relevant Loan.  Accrued and unpaid  interest on
each outstanding Fixed Rate Loan shall be due and payable on the last day of the
Interest  Period for such Fixed Rate Loan and  additionally,  in the case of any
Interest  Period  in excess of three  months,  on the day of the third  calendar
month following the  commencement of such Interest Period  corresponding  to the
day of the calendar month on which such Interest Period  commenced,  the payment
in each  instance  to be the amount of  interest  which has  accrued and remains
unpaid in respect of the relevant  Loan. The  outstanding  balance of Borrowers'
Loan Account,  together with all accrued and unpaid interest  thereon,  shall be
due and payable on the Commitment  Termination  Date. At the time of making each
payment  hereunder  or under the  Notes  (other  than  payments  applied  to the
outstanding  balance of Borrowers' Loan Account in accordance with Section 6.1),
Seitel on behalf of  Borrowers,  shall  specify  to the Agent the Loans or other
amounts  payable by Borrowers  hereunder to which such payment is to be applied.
In the event Seitel, on behalf of Borrowers, fails to so specify, or if an Event
of Default has occurred and is continuing, the Agent may apply any such payments
as it elects (with the consent of the Required Banks) in its sole discretion.

                 3.10 Outstanding Amounts. The outstanding balance of Borrowers'
Loan Account  reflected by the notations by the Banks (acting through the Agent)
on  their  records  shall  be  deemed  rebuttably  presumptive  evidence  of the
principal  amount  owing on each of the  Notes.  The  liability  for  payment of
principal  and  interest  evidenced  by the Notes shall be limited to  principal
amounts  actually  advanced  and  outstanding  pursuant  to this  Agreement  and
interest on such amounts calculated in accordance with this Agreement.

                 3.11 Time, Place, and Method of Payments. All payments required
pursuant to this  Agreement  or the Notes  shall be made in lawful  money of the
United States of America and in  immediately  available  funds,  shall be deemed
received by the Agent on the next  Business Day  following  receipt if notice of
the payment is not received by Agent by 1:30 p.m.,  Central Standard or Daylight
Savings Time, as the case may be (if via facsimile, it will be



                                       35

<PAGE>



followed  up with a phone call to Agent from  Seitel,  on behalf of  Borrowers),
shall be made at the  Principal  Office.  Except  as  provided  to the  contrary
herein,  if the due date of any  payment  hereunder  or under  the  Notes  would
otherwise fall on a day which is not a Business Day, such date shall be extended
to the next  succeeding  Business  Day,  and  interest  shall be payable for any
principal so extended for the period of such extension.

                 3.12 Voluntary Prepayments and Conversions of Loans. Subject to
applicable  provisions of this Agreement,  Borrowers shall have the right at any
time or from time to time to prepay  Loans and to  convert  Loans of one type or
with one Interest Period into Loans of another type or with a different Interest
Period;  provided,  however,  that (a) Borrowers  shall give the Agent notice of
each such prepayment or conversion of all or any portion of a Fixed Rate Loan no
less than one Business Day prior to prepayment or conversion (in a timely manner
as  required  by this  Agreement),  (b) any Fixed  Rate Loan may be  prepaid  or
converted  only on the last day of an  Interest  Period for such  Loan,  (c) the
Borrowers  shall pay all accrued and unpaid  interest on the amounts  prepaid or
converted,  and (d) no such prepayment or conversion shall serve to postpone the
repayment when due of any Liability.

                 3.13  Commitment  Fee.  In addition to interest on the Notes as
provided  herein and the Facility Fees payable  hereunder and to compensate  the
Banks for maintaining funds available from and after the Closing Date, Borrowers
shall pay to the Agent,  for the benefit of the Banks, in immediately  available
funds,  on the 1st day of July,  1995, and on the 1st day of each third calendar
month thereafter during the Commitment Period, and on the Commitment Termination
Date, a fee (which  shall begin to accrue on the Closing  Date) in the amount of
one-half  percent  (1/2%)  per annum,  calculated  on the basis of a year of 360
days, as the case may be, and actual days elapsed  (including  the first day but
excluding the last day), on the average daily amount of the Available Commitment
during the preceding three calendar month period (or such period as has actually
elapsed as in the case of the first period which shall begin on the Closing Date
and  last  period,  which  shall  end  on  the  Commitment   Termination  Date).
Notwithstanding the foregoing,  as an additional condition to Banks' obligations
hereunder,  on the Closing Date of this  Agreement,  Borrower shall pay to Agent
all amounts due under Section 8.6 of the Prior Loan  Agreement as if the Closing
Date  constituted  the  Maturity  Date  under and as  defined  in the Prior Loan
Agreement.  For purposes of this subsection,  "Available Commitment" shall mean,
at any time,  an amount equal to the  remainder,  if any, of (a)  $25,000,000.00
minus (b) the balance of the Borrowers' Loan Account at such time.

                 3.14  Facility  Fee.  In  addition  to interest on the Notes as
provided  herein and  Commitment  Fees payable  hereunder and to compensate  the
Banks for the costs of the  increased  extension  of credit  hereunder  from the
amount  available  under and with  respect  to the  Prior  Loan  Agreement,  the
Borrowers shall pay to Agent for



                                       36

<PAGE>



the benefit of the Banks, in immediately  available  funds, a facility fee equal
to $25,000.00.  The Borrowers  paid one-half of such fee upon  acceptance of the
commitment  of this  credit  facility  to the  Borrowers  by the Banks  with the
balance due on the Closing Date.

                 3.15 Loans to Satisfy Obligations of Borrowers.  The Banks may,
but shall not be obligated to, make Loans for the benefit of Borrowers and apply
proceeds thereof to the satisfaction of any condition, warranty, representation,
or  covenant  of  Borrowers  contained  in this  Agreement  or any other  Credit
Document.  Any such Loan shall be  evidenced by the Notes and shall be made as a
Floating  Rate Loan;  provided  that the Agent shall give the Borrowers at least
five (5) Business  Days' advance  written notice before either Bank makes such a
Loan to satisfy a condition, warranty,  representation, or covenant of Borrowers
(or any of them).

                 3.16  Security  Interest  in  Accounts;  Right  of  Offset.  As
security  for  the  payment  and  performance  of  the  Liabilities,   Borrowers
(individually and collectively) hereby transfer, assign, and pledge to the Banks
(individually  and  collectively)  and  grant  to the  Banks  (individually  and
collectively) a security  interest in all funds of Borrowers (held  individually
by each Borrower and  collectively  by all  Borrowers)  now or hereafter or from
time to time on deposit  with  either of the Banks,  with such  interest  of the
Banks to be retransferred,  reassigned,  and/or released by the Banks (or either
of them),  as the case may be, at the expense of Borrowers  upon payment in full
and complete  performance  by Borrowers  of all  Liabilities  owing to each such
Bank,  as the case may be. All  remedies  as secured  party or  assignee of such
funds  shall be  exercisable  by the Banks upon the  occurrence  of any Event of
Default,  regardless  of whether the exercise of any such remedy would result in
any  penalty or loss of interest or profit  with  respect to any  withdrawal  of
funds  deposited  in a time  deposit  account  prior  to the  maturity  thereof.
Furthermore, Borrowers (individually and collectively) hereby grant to Agent and
the Banks (individually and collectively) the right, exercisable upon and during
the continuation of an Event of Default,  of offset or banker's lien against all
funds of Borrowers (individually and collectively) now or hereafter or from time
to time on deposit with either of the Banks,  regardless of whether the exercise
of any such  remedy  would  result in any  penalty or loss of interest or profit
with respect to any  withdrawal  of funds  deposited  in a time deposit  account
prior to the maturity thereof.

                 3.17 General  Provisions  Relating to  Interest.  (a) It is the
intention of the parties  hereto to comply  strictly  with the usury laws of the
State of Texas and the United States of America. In this connection, there shall
never be collected, charged, or received on the sums advanced hereunder interest
in excess of that which would accrue at the Highest Lawful Rate. For purposes of
Article  5069-1.04,  Vernon's Texas Civil  Statutes,  as amended,  the Borrowers
agree that the Highest Lawful Rate shall be the



                                       37

<PAGE>



"indicated (weekly) rate ceiling" as defined in such Article,  provided that the
Banks may also rely, to the extent  permitted by applicable laws of the State of
Texas or the United States of America,  on alternative maximum rates of interest
under  other  laws of the  State  of  Texas  or the  United  States  of  America
applicable to the Banks, if greater.

                  (b)  Notwithstanding  anything  herein  or in the Notes to the
contrary,  during any  Limitation  Period,  the  interest  rate to be charged on
amounts  evidenced  by the  Notes  shall be the  Highest  Lawful  Rate,  and the
obligation,  if any, of the  Borrowers  for the payment of fees or other charges
deemed to be interest under applicable law shall be suspended. During any period
or periods of time  following a Limitation  Period,  to the extent  permitted by
applicable  laws of the  State of Texas or the  United  States of  America,  the
interest rate to be charged  hereunder  shall remain at the Highest  Lawful Rate
until  such  time as  there  has  been  paid to the  Banks  and  the  Agent,  as
appropriate (i) the amount of interest in excess of that accruing at the Highest
Lawful Rate that the Banks would have received during the Limitation  Period had
the  interest  rate  remained at the  otherwise  applicable  rate,  and (ii) all
interest  and fees  otherwise  payable to the Banks and the  Agent,  but for the
effect of such Limitation Period.

                  (c) If, under any circumstances, the aggregate amounts paid on
the Notes or under this Agreement or any other Credit  Document  include amounts
which by law are deemed interest and which would exceed the amount  permitted if
the  Highest   Lawful  Rate  were  in  effect,   Borrowers   (individually   and
collectively) stipulate that such payment and collection will have been and will
be deemed to have been, to the extent  permitted by applicable laws of the State
of Texas or the United States of America,  the result of  mathematical  error on
the part of Borrowers and the Banks and the Agent;  and the party receiving such
payment shall  promptly  refund the amount of such excess (to the extent only of
such  interest  payments  in excess of that which  would have  accrued  and been
payable on the basis of the Highest Lawful Rate) upon discovery of such error by
such party or notice  thereof from any Borrower.  In the event that the maturity
of any Liability is  accelerated,  by reason of an election by the Agent, or the
Required  Banks or  otherwise,  or in the  event of any  required  or  permitted
prepayment,  then the consideration  constituting interest under applicable laws
may never exceed the Highest  Lawful Rate;  and excess amounts paid which by law
are deemed interest, if any, shall be credited by the Agent and the Banks on the
principal  amount  of  the  Liabilities,  or if  the  principal  amount  of  the
Liabilities shall have been paid in full, refunded to Borrowers.

                  (d) All sums  paid,  or agreed to be paid,  to Banks and Agent
for the use,  forbearance and detention of the proceeds of any advance hereunder
shall,  to the extent  permitted  by  applicable  law, be  amortized,  prorated,
allocated, and spread throughout the full term hereof until paid in full so that
the actual rate of interest



                                       38

<PAGE>



is uniform but does not exceed the Highest Lawful Rate  throughout the full term
hereof.

                 3.18      Yield Protection.  Borrowers shall pay to any Bank
such amounts as shall be sufficient in the reasonable opinion of
such Bank to compensate it for any loss, cost, or expense incurred
by and as a result of:

                  (a) any payment,  prepayment, or conversion by any Borrower of
a Fixed Rate Loan on a date other  than the last day of an  Interest  Period for
such Loan; or

                  (b) any failure by  Borrowers to borrow a Fixed Rate Loan from
the Banks on the date for such  borrowing  specified in the  relevant  Borrowing
Request;

such compensation to include, without limitation,  with respect to any LIBO Rate
Loan, an amount equal to the excess, if any, of (i) the amount of interest which
would have accrued on the principal amount so paid, prepaid,  converted,  or not
borrowed for the period from the date of such payment,  prepayment,  conversion,
or failure  to borrow to the last day of the then  current  Interest  Period for
such Loan (or, in the case of a failure to borrow,  the Interest Period for such
Loan which would have  commenced  on the date of such  failure to borrow) at the
applicable rate of interest for such Loan provided for herein over (ii) (x) with
respect to any  payment,  prepayment,  or  conversion  to a Fixed Rate Loan of a
different  Interest  Period,  or failure to borrow,  the interest  component (as
reasonably  determined by such Bank) of the amount (as reasonably  determined by
such Bank) the Banks  would have bid in the London  interbank  market for Dollar
deposits  of  amounts   comparable  to  such  principal  amount  and  maturities
comparable  to such period,  and (ii) with respect to conversion of a Fixed Rate
Loan to a Floating Rate Loan, the interest  payable under the Floating Rate Loan
to the last day of the then current Interest Period.

                 3.19  Limitation  on Types of  Loans.  Anything  herein  to the
contrary notwithstanding, no more than three separate Loans shall be outstanding
at any one time,  with,  for purposes of this  Section,  all Floating Rate Loans
constituting  one Loan,  and all LIBO Rate  Loans for the same  Interest  Period
constituting one Loan. Anything herein to the contrary  notwithstanding,  if, on
or prior to the  determination  of any interest  rate for any LIBO Rate Loan for
any Interest Period therefor,  the Banks determine (which determination shall be
conclusive)  that  quotations of interest rates for the deposits  referred to in
the  definition  of "LIBO  Rate" in  Section  1 are not  being  provided  in the
relevant amounts or for the relevant  maturities for purposes of determining the
rate of interest  for such Loan as provided  in this  Agreement,  then the Agent
shall  give  Borrowers  prompt  notice  thereof;  and so long as such  condition
remains  in effect,  the Banks  shall be under no  obligation  to make LIBO Rate
Loans or to convert Loans of any other type into LIBO Rate Loans,  and Borrowers
shall, on the last day of the then current  Interest Period for each outstanding
LIBO Rate



                                       39

<PAGE>



Loan,  either  prepay such LIBO Rate Loan or convert such Loan into another type
of Loan in accordance  with Section 3.12.  Before giving such notice pursuant to
this Section,  Banks will  designate a different  available  Applicable  Lending
Office  for LIBO Rate  Loans or take such  other  action  as the  Borrowers  may
request  if such  designation  or  action  will  avoid the need to  suspend  the
obligation  of the Banks to make LIBO Rate Loans  hereunder and will not, in the
reasonable opinion of the Banks, be disadvantageous to the Banks.

                 3.20  Illegality.  Notwithstanding  any other provision of this
Agreement,  in the  event  that it  becomes  unlawful  for the  Banks  or  their
Applicable  Lending Office to (a) honor its obligation to make any type of Fixed
Rate Loans  hereunder,  or (b) maintain any type of Fixed Rate Loans  hereunder,
then the Banks shall promptly notify the Borrowers  thereof;  and the obligation
of the Banks  hereunder  to make such type of Fixed  Rate  Loans and to  convert
other types of Loans into Fixed Rate Loans of such type shall be suspended until
such time as the Banks may again  make and  maintain  Fixed  Rate  Loans of such
type, and the outstanding  Fixed Rate Loans of such type shall be converted into
Floating Rate Loans in accordance  with Section 3.12.  Before giving such notice
pursuant  to this  Section,  the Banks  will  designate  a  different  available
Applicable  Lending Office for Fixed Rate Loans or take such other action as the
Borrowers  may  request  if such  designation  or action  will avoid the need to
suspend  the  obligation  of the Banks to make Fixed Rate Loans and will not, in
the reasonable opinion of the Banks, be disadvantageous to the Banks.

                 3.21  Regulatory  Change.  In the  event  that by reason of any
Regulatory Change,  Banks (a) incur Additional Costs based on or measured by the
excess above a specified  level of the amount of a category of deposits or other
liabilities  of the Banks  which  includes  deposits by  reference  to which the
interest rate on any Fixed Rate Loan is determined as provided in this Agreement
or a  category  of  extensions  of  credit or other  assets  of the Banks  which
includes  any Fixed Rate  Loan,  or (b) become  subject to  restrictions  on the
amount of such a category of liabilities  or assets which it may hold,  then, at
the election of the Banks with notice to Borrowers,  the obligation of the Banks
to make such Fixed Rate Loans and to convert Floating Rate Loans into such Fixed
Rate Loans shall be suspended until such time as such  Regulatory  Change ceases
to be in effect,  and all such  outstanding  Fixed Rate Loans shall be converted
into  Floating  Rate  Loans in  accordance  with  Section  3.12;  provided  that
Borrowers shall not be obligated to pay any amounts to Banks pursuant to Section
3.18 upon any such conversion.

                 3.22  Limitations  on Interest  Periods.  Each Interest  Period
selected by the  Borrowers  (a) which  commences  on the last  Business Day of a
calendar  month (or, with respect to any LIBO Rate Loan, any day for which there
is no  numerically  corresponding  day in the  appropriate  subsequent  calendar
month) shall end on the last Business Day of the appropriate subsequent calendar
month,  (b) which would otherwise end on a day which is not a Business Day shall
end on the next succeeding Business Day (or, if such next



                                       40

<PAGE>



succeeding Business Day falls in the next succeeding calendar month, on the next
preceding Business Day), (c) which would otherwise commence before and end after
Final Maturity shall end on Final Maturity, and (d) shall have a duration of not
less than 30 days, or one month,  as to any LIBO Rate Loan, and, if any Interest
Period  would  otherwise  be a shorter  period,  the  relevant  Loan  shall be a
Floating Rate Loan during such period.

                 3.23 No Commitment to Extend.  Notwithstanding anything in this
Agreement to the contrary, the obligation of Banks (acting through the Agent) to
make  advances  under the  Revolving  Line  shall  terminate  on the  Commitment
Termination Date;  provided however,  Borrowers and Banks recognize that, in the
future,  they may wish to  extend  the  Commitment  Termination  Date by  mutual
agreement.  No  modification  or amendment of this Agreement or extension of the
Commitment Termination Date shall be effective unless placed in writing and duly
executed by Banks and Borrowers. The termination or expiration of the obligation
of Banks (acting  through the Agent) to make advances  under the Revolving  Line
shall in no way  affect  any  transactions  entered  into or rights  created  or
obligations  incurred  prior to such  termination or  expiration;  rather,  such
rights  and  obligations  shall  be fully  operative  until  the same are  fully
disposed of, concluded,  and/or  liquidated.  Without limiting the generality of
the foregoing, such termination or expiration shall not release nor diminish any
of Borrowers'  joint and several  obligations  and  agreements  hereunder  until
payment  in  full  of all of the  Liabilities  (including,  without  limitation,
payment of all Liabilities  arising after the Commitment  Termination  Date as a
result of  advances  made by Banks at the request of  Borrowers  or on behalf of
Borrowers)  and all other sums and  amounts  payable  under or  pursuant to this
Agreement.  This Agreement and the other Credit  Documents shall be a continuing
agreement in every respect.


                                   SECTION 4
                   BORROWER'S REPRESENTATIONS AND WARRANTIES

                 4.1 Representations  and Warranties.  To induce Banks and Agent
to  enter  into  this  Agreement,   Borrowers  (individually  and  collectively)
represent and warrant to Banks and Agent (which  representations  and warranties
are made in addition to the representations and warranties now or hereafter made
in the other Credit  Documents and will survive the delivery of this  Agreement)
as follows:

                  (a)  Organization  of Seitel.  Seitel (i) is a duly  organized
         Delaware corporation,  validly existing, and in good standing under the
         laws of the States of Delaware,  Texas, Alabama and Louisiana; (ii) has
         all  necessary  licenses and  corporate  power and authority to own its
         assets and conduct its business as now conducted or presently  proposed
         to be conducted; (iii) has no Subsidiaries,  except as shown on Exhibit
         "I"; and (iv) is duly  qualified  and in good standing (and will remain
         so



                                       41

<PAGE>



         qualified and in good standing) in every jurisdiction in which it is or
         shall be doing  business  or in which the  failure  so to  qualify  and
         remain in good standing  would or could have a Material  Adverse Change
         on its business or Property, the Collateral, Banks, or Agent;

                  (b)  Organization  of  Geophysical.  Geophysical (i) is a duly
         organized Delaware corporation,  validly existing, and in good standing
         under the laws of the States of Delaware, Texas and Louisiana; (ii) has
         all  necessary  licenses and  corporate  power and authority to own its
         assets and conduct its business as now conducted or presently  proposed
         to be conducted;  (iii) has no Subsidiaries  except as shown on Exhibit
         "I"; and (iv) is duly  qualified  and in good standing (and will remain
         so qualified and in good standing) in every jurisdiction in which it is
         or shall be doing  business  or in which the  failure so to qualify and
         remain in good standing  would or could have a Material  Adverse Change
         on its business or Property, the Collateral, Banks, or Agent;

                  (c)  Organization  of Offshore.  Exsol (i) is a duly organized
         Delaware corporation,  validly existing, and in good standing under the
         laws of the  States  of  Delaware  and  Texas;  (ii) has all  necessary
         licenses  and  corporate  power and  authority  to own its  assets  and
         conduct  its  business as now  conducted  or  presently  proposed to be
         conducted; (iii) has no Subsidiaries; and (iv) is duly qualified and in
         good standing  (and will remain so qualified  and in good  standing) in
         every  jurisdiction  in which it is or  shall be doing  business  or in
         which the  failure so to qualify and remain in good  standing  would or
         could have a Material  Adverse Change on its business or Property,  the
         Collateral, Banks, or Agent;

                  (d)  Organization  of Exsol.  Offshore (i) is a duly organized
         Delaware corporation,  validly existing, and in good standing under the
         laws of the  States  of  Delaware  and  Texas;  (ii) has all  necessary
         licenses  and  corporate  power and  authority  to own its  assets  and
         conduct  its  business as now  conducted  or  presently  proposed to be
         conducted; (iii) has no Subsidiaries; and (iv) is duly qualified and in
         good standing  (and will remain so qualified  and in good  standing) in
         every  jurisdiction  in which it is or  shall be doing  business  or in
         which the  failure so to qualify and remain in good  standing  would or
         could have a Material  Adverse Change on its business or Property,  the
         Collateral, Banks, or Agent;

                 (e) Organization of Data. Data (i) is a duly organized Delaware
          corporation,  validly existing, and in good standing under the laws of
          the States of Delaware and Texas; (ii) has all necessary  licenses and
          corporate power and authority to own its assets and conduct its



                                       42

<PAGE>



         business as now conducted or presently proposed to be conducted;  (iii)
         has no  Subsidiaries  except as shown on Exhibit  "I"; and (iv) is duly
         qualified  and in good  standing  (and will remain so qualified  and in
         good standing) in every  jurisdiction  in which it is or shall be doing
         business  or in which the  failure  so to  qualify  and  remain in good
         standing would or could have a Material  Adverse Change on its business
         or property, the Collateral, Banks or Agent;

                  (f)  Due   Authorization.   The   execution,   delivery,   and
         performance   hereof  and  of  all  other   agreements  or  instruments
         contemplated  hereby are within each Borrower's  corporate powers, have
         been duly  authorized,  and are not in contravention of any Requirement
         of Law or the terms of each  Borrower's  certificate of  incorporation,
         bylaws,  or  other  organizational  documents,  or  of  any  indenture,
         agreement,  or undertaking to which any Borrower is a party or by which
         it or any of its respective  properties are bound. This Agreement,  the
         Note,  the  other  Credit  Documents,  and  all  other  agreements  and
         instruments  executed by Borrowers  (individually  or  collectively) in
         connection  herewith  have been validly  executed and delivered by each
         Borrower,  as applicable,  and  constitute  legal,  valid,  and binding
         obligations  of  each  Borrower   enforceable   against   Borrowers  in
         accordance with their respective terms;

                  (g) Ownership. Except for the security interest granted herein
         by Borrowers or by any other  document  executed in favor of Banks (and
         either  of  their  predecessors)  or  Agent  and the  Permitted  Liens,
         Borrowers  are the sole owners of the Accounts,  the Seismic Data,  and
         each and every other item of  Collateral  free from any lien,  security
         interest, or encumbrance;

                  (h) Status of Eligible Accounts.  Each Eligible Account,  used
         for purposes of calculating the Borrowing Base,  represents  either (i)
         an undisputed,  bona fide  indebtedness  incurred by the Account Debtor
         named therein, for merchandise held subject to delivery instructions or
         theretofore shipped or delivered pursuant to a contract of sale, or for
         services  theretofore  performed by Borrowers  with or for said Account
         Debtor, or (ii) a distribution payable (or which is reasonably expected
         to be payable within 120 days) to Offshore under the Digitel Agreement;
         there are no  set-offs,  counterclaims,  or  disputes  against any such
         Eligible  Account except as indicated in some written list,  statement,
         or  invoice  furnished  to  Banks  with  reference  thereto;   and  the
         applicable  Borrowers  are duly  authorized  to  subject  the same to a
         security  interest  in  favor  of  Banks.  If any  Account  shall be in
         violation  of any  one or  more  of the  warranties  expressed  in this
         subsection,



                                       43

<PAGE>



         or otherwise does not meet the  requirements of an Eligible  Account as
         defined herein, it shall not be deemed an Eligible Account for purposes
         of this Agreement;

                  (i) Financial  Statements.  Subject to any limitations  stated
         therein or in connection  therewith,  the Financial  Statements and all
         other balance  sheets,  earnings  statements,  and other financial data
         which have been  furnished  to Banks to induce  them to enter into this
         Agreement, or otherwise furnished in connection herewith, (i) do fairly
         represent  the  financial  condition  and results of operations of each
         Borrower (or other Person, as applicable),  as of the dates and for the
         periods for which the same are  furnished,  and (ii) have been prepared
         in accordance  with GAAP,  subject to normal year end  adjustments.  No
         Material  Adverse  Change has occurred in the  condition,  financial or
         otherwise,  of Borrowers (individually and collectively) since the date
         of the  Financial  Statements.  No Borrower  has made  investments  in,
         advances to, or guaranties of the obligations (other than guaranties of
         obligations  of its  Affiliates  which have been  disclosed to Banks or
         which are  otherwise  permitted  hereunder)  of any  Person,  except as
         disclosed on the Financial Statements;

                  (j)  Locations  of  Collateral.  Set forth on Exhibit "J" is a
         list  of each  location  at  which  Seismic  Data  and  other  tangible
         Collateral is kept, whether for storage,  like purposes,  or otherwise.
         Also set forth on Exhibit "J" is a list of each office of  Borrowers at
         which records of Borrowers pertaining to Accounts are kept. The address
         of each Borrower's  chief executive office is as set forth on page 1 of
         this Agreement;

                  (k) Litigation.  Except as  specifically  disclosed in Exhibit
         "K" attached hereto or hereafter from time to time to Banks pursuant to
         Section 7.1(l)(iii) hereof, there are no actions, suits, or proceedings
         pending or, to the  knowledge of any  Borrower as of the Closing  Date,
         threatened  against  Borrowers  that  Borrowers  would be  required  to
         disclose to Bank pursuant to Section 7.1(l)(iii) hereof;

                  (l)  Compliance  With Laws.  Borrowers  are each in compliance
         with all  Requirements  of Law applicable to,  governing,  or affecting
         Borrowers  (individually or collectively),  their respective operations
         and  Property,  the  Collateral,  or any part of any of the  foregoing,
         which violation or  noncompliance  individually  or collectively  could
         reasonably be expected to cause a Material Adverse Change;




                                       44

<PAGE>



                  (m)  No  Misstatements.   Neither  this  Agreement,   nor  any
         document,  certificate,  exhibit,  or statement  furnished to either or
         both Banks by or on behalf of any Borrower pursuant to or in connection
         with this Agreement contains any untrue statement of a material fact or
         omits  to  state a  material  fact  necessary  to make  the  statements
         contained herein and therein not misleading.  There is no fact known to
         Borrowers that materially and adversely affects, or will materially and
         adversely affect,  the assets,  business,  operations,  or condition of
         Borrowers (individually or collectively) that has not been specifically
         set forth in this  Agreement  or  otherwise  disclosed  by Borrowers to
         Banks in writing;

                 (n) Names.  Borrowers'  names  always have been as set forth on
          the  first  page  of this  Agreement,  except  that  Data's  name  was
          SGI-Nigeria,  Inc.  prior to  March 9,  1994,  and  Seitel's  name was
          Seismic Enterprises, Inc. prior to August 4, 1987;

                  (o)  No  Default.  Borrowers  are  not in  default  (i) in the
         performance,  observance,  or  fulfillment  of any of the  obligations,
         covenants,  or  conditions  contained in any agreement or instrument to
         which any of them is a party,  (ii) under any  Requirement  of Law,  or
         (iii) as a result  of a demand  of any  Governmental  Authority,  which
         default or violation might cause a Material Adverse Change;

                  (p) Tax  Returns.  Each  Borrower  has filed  all tax  returns
         required  to be filed and has paid all taxes  shown  thereon to be due,
         including  interest and  penalties,  or due pursuant to any  assessment
         received by Borrowers, except such taxes, if any, under contest in good
         faith and for which adequate reserves have been provided.  The charges,
         accruals, and reserves on the books of Borrowers for any taxes or other
         governmental  charges are, in the opinion of each  Borrower,  adequate.
         Each Borrower has paid all franchise and other taxes which are now due;

                  (q) No Margin Stock.  No Borrower  owns, and is engaged in the
         business of extending credit for the purpose of carrying or purchasing,
         "margin  stock"  within  the  meaning of  Regulation  U of the Board of
         Governors of the Federal Reserve System (herein called "margin stock").
         None of the  proceeds  of the Notes will be used for (i) the purpose of
         purchasing or carrying any margin  stock,  (ii) the purpose of reducing
         or retiring any indebtedness which was originally  incurred to purchase
         or carry a margin  stock,  or  (iii)  any  other  purpose  which  might
         constitute this transaction as a "purpose" credit within the meaning of
         said  Regulation  U,  as now in  effect  or as it  may  hereinafter  be
         amended.  Neither Borrowers nor any agent acting on any of their behalf
         has taken or



                                       45

<PAGE>



         will take any action  which might cause this  Agreement or the Notes to
         violate  Regulation  U,  Regulation  T, or any other  regulation of the
         Board of  Governors  of the  Federal  Reserve  System or to violate the
         Securities  Exchange  Act of 1934,  in each case as now in effect or as
         the same may  hereafter  be in effect on the date of any advance  under
         the Notes;

                  (r)      No Investment Company.  No Borrower is an
         "investment company" within the meaning of the Investment
         Company Act of 1940, as amended;

                  (s)      No Collective Bargaining Agreement.  No
         Borrower is a party to any collective bargaining
         agreement, and there are no material grievances,
         disputes, or controversies with any union or any other
         organization of any of their employees, or threats of
         strikes, work stoppages, or any asserted pending demands
         for collective bargaining by any union or organization;

                  (t)      No Registration of Intellectual Property.  None
                           ----------------------------------------
         of the  Collateral  is  patented,  copyrighted,  licensed  (except  for
         non-exclusive  licenses granted pursuant to Licensing Agreements and/or
         Participation Agreements), or trademarked or subject to any copyrights,
         license  (except  for   non-exclusive   licenses  granted  pursuant  to
         Licensing  Agreements  and/or  Participation  Agreements),  patent,  or
         trademark;

                  (u)      Existing Plans.  No Borrower maintains nor has
         maintained any Plan other than Seitel's 401(k) Plan.  No
         Borrower currently contributes to or has any obligation
         to contribute to or otherwise has any liability with
         respect to any Plan other than Seitel's 401(k) Plan;

                  (v)      Hazardous Substances.  To the best knowledge
         and belief of each Borrower, except as would not have a
         Material Adverse Change:

                        (i)         no Property of any Borrower is
                  currently on or has ever been on, or is
                  adjacent to any Property which is on or has
                  ever been on, any federal or state list of
                  Superfund Sites;

                       (ii)  no  Hazardous   Substances   have  been  generated,
                  transported,  and/or  disposed  of by any  Borrower  at a site
                  which  was,  at the time of such  generation,  transportation,
                  and/or disposal, or has since become, a Superfund Site;

                      (iii)         except in accordance with applicable
                  Requirements of Law or the terms of a valid



                                               46

<PAGE>



                  permit,  license,  certificate,  or approval  of the  relevant
                  Governmental  Authority, no Release of Hazardous Substances by
                  any Borrower or from, affecting, or related to any Property of
                  any  Borrower or adjacent to any  Property of any Borrower has
                  occurred; and

                       (iv)         no Environmental Complaint has been
                  received by any Borrower;

                  (w) No Holding Company No Borrower is a "holding  company," or
         an "affiliate" of a "holding company" or of a "subsidiary company" of a
         "holding  company,"  within the meaning of the Public  Utility  Holding
         Company Act of 1935, as amended.

                  (x)  Use  of  Intellectual  Property.  Borrowers  own  or  are
         licensed  to use all  Intellectual  Property  necessary  to conduct all
         business material to their financial condition, business, or operations
         as such business is currently conducted. Except as disclosed on Exhibit
         "K" hereto or hereafter  from time to time to Banks pursuant to Section
         7.1(l)(iii)  hereof,  no claim has been  asserted  or is pending by any
         Person with the respect to the use of any such Intellectual Property or
         challenging or questioning  the validity or  effectiveness  of any such
         Intellectual  Property;  and no Borrower knows of a valid basis for any
         such claim. The use of such Intellectual Property by the Borrowers does
         not  infringe on the rights of any  Person,  except for such claims and
         infringements  as do not, in the  aggregate,  give rise to any material
         liability on the part of any Borrower;

                  (y) No Acts of God.  Neither the  business nor any Property of
         any Borrower has been materially  adversely affected as a result of any
         fire,  explosion,  earthquake,  flood,  drought,  windstorm,  accident,
         strike or other labor  disturbance,  embargo,  requisition or taking of
         Property, or cancellation of contracts,  permits, or concessions by any
         Governmental  Authority,  riot,  activities of armed forces, or acts of
         God;

                 (z)  No  Events  of  Default.  No  event  has  occurred  and no
          condition exists which would,  upon the execution and delivery of this
          Agreement or Borrower's performance hereunder, constitute a Default or
          an Event of Default;

                  (aa)  Existing  Relationships.   There  exists  no  actual  or
         threatened  termination,   cancellation,   or  limitation  of,  or  any
         modification  or change  in,  the  business  relationship  between  any
         Borrower  with any customer or any group of customers  whose  purchases
         individually  or in the  aggregate  are material to the business of any
         Borrower, or with any material supplier, and there exists



                                                    47

<PAGE>



         no present  condition  or state of facts or  circumstances  which would
         materially adversely affect any such Borrower or prevent the particular
         Borrower from  conducting  such business after the  consummation of the
         transaction  contemplated by this Agreement in  substantially  the same
         manner in which it has heretofore been conducted; and

                  (ab) Agreements Among Borrowers. Borrowers have entered into a
         variety of  agreements  between and among  Borrowers  (the  "Agreements
         Among  Borrowers"),  all of which  Agreements  Among  Borrowers  are of
         material  economic  benefit  to  each of  Borrowers  that  are  parties
         thereto.  Borrowings by each of Borrowers under the Revolving Line will
         materially  benefit  (directly and indirectly) and are essential to all
         of Borrowers  (individually and collectively) in the continuing conduct
         of their  respective  businesses  by virtue of,  among  other  reasons,
         substantial   inter-corporate   business  and  financial  relationships
         between and among Borrowers, the ability of Borrowers to borrow at more
         favorable  interest rates and upon more favorable  terms and conditions
         together than could Borrowers if they borrowed individually rather than
         as a group, and the need for each of Borrowers, directly or indirectly,
         to have the  financial  capacity  to  perform  under  the  terms of the
         Agreements Among Borrowers.  Borrowers shall not, solely as a result of
         the  representations and warranties set forth in this Section be deemed
         to be engaged in a partnership or joint  venture.  Prior to the Closing
         Date,  each of Borrowers is solvent,  and able to pay its debts as they
         come due.  Each of  Borrowers  has  adequate  capital  to  conduct  the
         business in which it is engaged.  The acceptance by any of Borrowers of
         advances  hereunder shall be deemed to be a representation and warranty
         to Banks  that  each of the  Borrowers  has  benefitted  (directly  and
         indirectly)  from the advance,  is solvent at the time of such advance,
         and otherwise that the  representations  and warranties of Borrowers in
         this  Agreement  are true and  correct  as if made again on the date of
         such advance.


                                                     SECTION 5
                                     SECURITY INTEREST OF BANKS IN COLLATERAL

                 5.1 Creation of Security Interest.  As security for the payment
and  performance  of all  Liabilities,  Banks and Agent for the benefit of Banks
shall have and Borrowers (individually and collectively) subject to the terms of
Section  5.7,  hereby  grant to each Bank and Agent for the  benefit  of Banks a
continuing  lien on,  security  interest  in and  right of  setoff  against  the
following Collateral:

                  All of each of Borrowers'  now or hereafter  owned,  existing,
created, arising or acquired:



                                                        48

<PAGE>




                  (a)      Accounts;

                  (b)      Inventory;

                  (c)      General Intangibles;

                  (d)      Equipment  (excluding  office  equipment,
          furnishings and Exsol's, Offshore's, and Geophysical's  Equipment not
          constituting Seismic Data);

                  (e)      Seismic Data;

                  (f) instruments, notes, notes receivable, documents, documents
         of title, policies and certificates of insurance,  securities,  chattel
         paper, deposits, cash and other similar property now or hereafter owned
         by one or more of Borrowers or in which one or more of Borrowers now or
         hereafter has an interest,  including,  without limitation, any and all
         such  property  as may  now or  hereafter  be in the  possession  of or
         deposited with Agent or one or more of Banks, or otherwise  assigned to
         Agent or one or more of Banks,  or as to which  Agent or one or more of
         Banks may now or hereafter control  possession by documents of title or
         otherwise;

                  (g) all books and  records  now owned and  hereafter  acquired
         relating  to  any  other  Collateral  and  all  files,  correspondence,
         computer programs,  tapes,  disks, and related data processing software
         owned by any  Borrower or in which any  Borrower  has an interest  that
         contains  information  concerning  or  relating  to any  of  the  other
         Collateral or any item thereof;

                 (h)  all of the  Pledged  Stock,  and  all  right,  title,  and
          interest of Offshore as a joint venturer of Digitel; and

                  (i) substitutions,  accessions, additions, parts, accessories,
         replacements,  Proceeds  and products of, for and to any and all of the
         foregoing, including, without limitation,  insurance and tort proceeds,
         and any and all income and other  proceeds and payments  from the sale,
         lease, collection, licensing, transfer, exchange, disposition or use of
         any and all of the  foregoing,  and  any  and all  such  substitutions,
         accessions, additions, parts, accessories,  replacements,  Proceeds and
         products in the form of any of the property  described or referenced in
         (a) through (h) above.

                  No  submission  by Borrowers to Banks or Agent of any schedule
or other particular  identification  of Collateral shall be necessary to vest in
Banks and Agent for the  benefit of Banks a security  interest in each and every
item of Collateral  now existing or hereafter  created or acquired,  but rather,
such security



                                       49

<PAGE>



interest shall vest in Banks and Agent for the benefit of Banks immediately upon
the creation or acquisition of any item of Collateral, without the necessity for
any other or further  action by  Borrowers or Banks and Agent for the benefit of
Banks; provided, however, that Borrowers shall execute such other and additional
documents,  instruments and agreements as reasonably may be required by Banks or
Agent for the benefit of Banks to evidence the security  interests  contemplated
hereby.  In  addition to and without  limitation  of the rights and  remedies of
Banks  or  Agent  for the  benefit  of  Banks  with  respect  to any  copyright,
trademark,  patent or service mark and other  Collateral under this Agreement or
otherwise,  Borrowers  (individually and collectively) hereby each grant, assign
and  transfer  to Banks and  Agent  for the  benefit  of  Banks,  a  fully-paid,
royalty-free,  perpetual,  non-exclusive,  unrestricted  license to use, modify,
reproduce, distribute and sublicense any copyright, trademark, patent or service
mark;  provided,  however,  that the  foregoing  license  shall not be effective
unless and until an Event of Default  shall have  occurred,  at which time,  the
aforementioned  license shall  commence and be effective  automatically  without
further action, consent or approval of Borrowers,  but shall terminate upon full
payment and performance of the Liabilities.

                 5.2 Perfection of Security  Interests.  To the extent allowable
under applicable law, the UCC shall govern the security  interests  provided for
herein. In connection  therewith,  Borrowers (at Borrowers'  expense) shall take
such  steps  and  execute,  deliver  and  file (as  applicable)  (or  cause  the
execution,  delivery and filing (as applicable  of) such  financing  statements,
continuation  statements,  agreements (including,  without limitation,  security
agreements  and  landlord,  creditor and  mortgagee  subordination  agreements),
documents,  and papers (all in form and substance acceptable to Agent and Banks)
as Agent and Banks may from time to time  request  to perfect  or  preserve  the
perfection  and  priority  of Banks'  and/or  Agent's  for the benefit of Banks'
security  interests  granted  hereby  or by any of the other  Credit  Documents.
Borrowers hereby appoint and empower Agent, or any employee of Agent which Agent
may  designate  for the  purpose,  as its  attorney-in-fact,  to execute  and/or
endorse (and file,  as  appropriate)  on its behalf any  documents,  agreements,
papers,  checks and financing  statements  which,  in Agent's sole judgment (but
with the approval of the Required  Banks),  are necessary to be executed  and/or
filed in order to (a) perfect or preserve the  perfection and priority of Banks'
and/or Agent's for the benefit of Banks' security interests granted hereby or by
any of the  other  Credit  Documents;  and  (b)  collect  or  realize  upon  the
Collateral or otherwise exercise all rights and remedies under any of the Credit
Documents or applicable law.

                 5.3 Other Laws; Power of Attorney. If, by reason of location of
one or more of Borrowers, the Collateral or otherwise,  the creation,  validity,
or perfection of security  interests provided for herein are or may be governed,
in whole or in part,  by law other than the  Uniform  Commercial  Code of Texas,
Borrowers shall take such steps and execute and deliver such documents,



                                       50

<PAGE>



agreements,  papers  and  financing  statements  as Agent  may from time to time
request to comply with the Uniform  Commercial  Code, the Uniform Trust Receipts
Act,  the  Factors  Lien  Act,  or  other  laws of  Texas  or  other  states  or
jurisdictions,  or to comply with the Ship  Mortgage  Act, the Federal  Aviation
Act, the Copyright  Act, the Patent Act, the Lanham  Trademark Act, or any other
federal law or regulation.  Borrowers  hereby appoint and empower Agent,  or any
employee  of  Agent  which  Agent  may  designate   for  the  purpose,   as  its
attorney-in-fact,  to execute and/or endorse (and file, as  appropriate)  on its
behalf any documents, agreements, papers, checks and financing statements which,
in Agent's sole  judgment  (but with the approval of the  Required  Banks),  are
necessary  to be  executed  and/or  filed  in order to (a)  perfect  (under  all
applicable  laws) or preserve the  perfection and priority of Banks' and Agent's
for the benefit of Banks'  security  interests  granted  hereby or by any of the
other  Credit  Documents;  and (b)  collect or realize  upon the  Collateral  or
otherwise  exercise all rights and remedies under any of the Credit Documents or
applicable law.

                 5.4 Obligations Secured. The security interest in, general lien
upon, and right of set-off against the Collateral provided for in Section 5.1 is
granted to secure the payment and other  performance of all Liabilities  whether
now existing or hereafter  arising,  under or in connection with this Agreement,
the Notes, or the other Credit  Documents,  and any  amendments,  modifications,
restatements, or substitutions thereof.

                 5.5 Miscellaneous Collateral Provisions.  The security interest
and other  rights of Banks and Agent on behalf of Banks  hereunder  shall not be
impaired by any indulgence,  moratorium, or release granted by Banks, including,
but not limited to: (a) any renewal,  extension, or modification which Banks may
grant  with  respect  to the  Notes;  (b) any  surrender,  compromise,  release,
renewal,  extension,  exchange, or substitution which Banks may grant in respect
of any item of the Collateral,  or any part thereof or any interest therein;  or
(c) any release or indulgence granted to any endorser,  guarantor,  or surety of
the Notes.

                 5.6 Filing  Reproductions.  At the option of Banks and Agent on
behalf of Banks,  a photocopy or other  reproduction  of this  Agreement or of a
financing statement covering the Collateral shall be sufficient and may be filed
as a financing statement.

                 5.7 Independent Grants of Security  Interests.  Notwithstanding
anything in Section 5.1 or elsewhere in this  Agreement to the contrary,  except
to the extent any Collateral is owned jointly among two or more of the Borrowers
(in which case the security  interest in such  Collateral is created  jointly by
all  Borrowers  owning the  particular  Collateral),  each Borrower has and does
hereby severally (and not jointly or  conditionally)  create a security interest
in and to the Collateral owned by the respective  Borrower.  The validity of any
grant and  creation of security or other pledge or right of offset in and to any
of the Collateral by any of the Borrowers  shall not be affected in any way by a
holding



                                       51

<PAGE>



of a court,  pursuant to the  Bankruptcy  Code or  otherwise,  that the security
interest granted herein by any other particular Borrower is void and ineffective
for any reason.


                                   SECTION 6
                             COLLECTION OF ACCOUNTS

                 6.1  Collection.  Borrowers shall direct all Account Debtors to
remit  payments on Accounts  directly to the Lockbox.  If  Borrowers  (or any of
them) receive any payments on Accounts,  Borrowers shall notify Agent of such as
received and shall hold the same in trust for Banks and Agent for the benefit of
Banks without  commingling the same with other funds of Borrowers and shall turn
the same over to Agent  immediately upon receipt in the identical form received.
All Account payments and other Proceeds transmitted to Agent via the Lockbox, by
Account Debtors,  Borrowers,  or otherwise,  shall be transferred daily by Agent
from the Lockbox and deposited into the Remittances  Account; the maintenance of
any such account shall be solely for the  convenience of Banks and Agent for the
benefit of Banks, and Borrowers shall not have any right,  title, or interest in
or to any such  account or in the  amounts at any time  appearing  to the credit
thereof.  Agent  may apply  and  credit  Account  payments  and  other  Proceeds
transmitted  to  Agent  via the  Lockbox,  by  Account  Debtors,  Borrowers,  or
otherwise,  against the outstanding balance in Borrowers' Loan Account, however,
Agent shall not be required to credit Borrowers' Loan Account with the amount of
any check or other instrument  constituting  provisional payment until Agent has
received final payment thereof at its office in cash or solvent credits accepted
by Agent.  Thereafter,  unless an Event of Default  shall have  occurred  and be
continuing,  any amounts  remaining  in the  Remittances  Account  shall be made
available to Borrowers by deposit  into  Seitel's  operating  account or in such
other manner acceptable to Banks and Borrowers. In addition, Borrowers shall, at
the request of Agent,  notify their Account Debtors of the security  interest of
Banks and Agent  for the  benefit  of Banks in any  Account  and shall  instruct
Account Debtors to remit payments directly to Agent (or as Agent shall otherwise
request),  and Agent may itself at any time so notify Account  Debtors.  For the
purposes  hereof,  any Proceeds  transmitted  to or otherwise  received by Agent
shall be deemed held by Agent for the prorated benefit of Banks.  Nothing herein
shall be deemed to diminish or limit any of Banks' or Agent's for the benefit of
Banks' rights or remedies  arising under  applicable  law,  this  Agreement,  or
otherwise.

                 6.2  Collection  Actions By Borrowers.  Borrowers (a) shall (i)
upon any Bank's request  deliver any  instrument or chattel paper  evidencing or
constituting  an Account to Agent for the  benefit of Banks,  and (ii) use their
best  efforts to collect  all of their  respective  Accounts  in a  commercially
reasonable  manner; and (b) agree that no court action or other legal proceeding
or garnishment,  attachment, repossession of property, detinue, sequestration or
any other repossession covered by an Account shall



                                       52

<PAGE>



be  attempted by one or more of  Borrowers  except by or under the  direction of
competent  legal  counsel.  BORROWERS,  JOINTLY AND  SEVERALLY,  HEREBY AGREE TO
INDEMNIFY  AND HOLD AGENT AND BANKS  HARMLESS  FOR ANY LOSS OR  LIABILITY OF ANY
KIND OR CHARACTER WHICH MAY BE ASSERTED  AGAINST AGENT AND/OR BANKS BY VIRTUE OF
ANY SUIT FILED,  PROCESS ISSUED,  OR ANY REPOSSESSION OR ATTEMPTED  REPOSSESSION
DONE OR ATTEMPTED BY ONE OR MORE OF BORROWERS OR BY VIRTUE OF ANY OTHER  ACTIONS
OR ENDEAVORS WHICH ONE OR MORE OF BORROWERS MAY MAKE TO COLLECT ANY COLLATERAL.


                                   SECTION 7
                             AFFIRMATIVE COVENANTS

                 7.1  Affirmative  Covenants.  In addition to the  covenants and
agreements of Borrowers  made  elsewhere in this  Agreement,  unless Banks shall
otherwise  consent in writing,  until all of the Liabilities  have been paid and
satisfied, Borrowers (individually and collectively) shall:

                 (a) Defend Collateral.  Defend the Accounts,  the Seismic Data,
          and each and every  other  item of  Collateral  and all  Proceeds  and
          products  thereof against all claims and demands of all Persons at any
          time claiming the same or any interest therein adverse to Banks;

                  (b) Pay Taxes and Assessments. Pay all taxes or charges levied
         on or with  respect to the  Collateral,  and will at all times keep the
         Accounts, the Seismic Data, and each and every other item of Collateral
         free and clear of all liens, claims, charges,  security interests,  and
         encumbrances whatsoever, except as otherwise expressly provided herein.
         If any lien, charge,  claim,  security  interest,  or encumbrance shall
         arise,  or be claimed or asserted  with  respect to the  Accounts,  the
         Seismic  Data,  or any other item of  Collateral,  Banks  may,  without
         notice to Borrowers  (notwithstanding  Section 3.15  hereof),  pay such
         taxes,  assessments,  charges,  or  claims,  and take any and all other
         actions  (including the payment of money) deemed  desirable by Banks to
         remove any such lien, charge, claim, security interest, or encumbrance,
         and  Borrowers  agree  that the  amounts  thereof  shall be  charged to
         Borrowers'  Loan Account  created hereby and shall bear interest at the
         rate of interest then borne by Borrowers' obligations under the Notes;

                  (c) Maintain  Valid Security  Interest.  Take all actions that
         Banks may reasonably request to establish and maintain a valid security
         interest in the Accounts,  the Seismic  Data,  and each and every other
         item of Collateral, free and clear of all other liens, claims, charges,
         security interests, and encumbrances  whatsoever,  except for Permitted
         Liens or as otherwise expressly provided herein;



                                       53

<PAGE>




                  (d) Notice of Name  Change.  Give Banks thirty (30) days prior
         written notice of any change in any Borrower's  name or location of its
         chief office, and execute and deliver to Banks all financing  statement
         amendments  and other  documents  requested by Banks prior to such name
         change becoming effective;

                  (e)  Financial  Reporting.  Deliver to Banks such  information
         regarding   the  business   affairs,   financial   condition,   assets,
         liabilities,  operations,  and  transactions  of Borrowers as Banks may
         reasonably  request,  and, without  limiting the foregoing,  furnish to
         Banks the following:

                  As soon as available, and in any event within 90 days from the
                  end of Seitel's  fiscal year, an audited  financial  statement
                  for  Seitel,  prepared  by its  independent  certified  public
                  accountant,  showing the financial  condition of Seitel,  on a
                  consolidating  and  consolidated  basis,  at the close of such
                  fiscal  year and the  results of its  operations  during  such
                  fiscal year,  which financial  statements  shall be materially
                  complete and correct,  prepared in accordance  with GAAP,  and
                  shall  include,  but shall  not be  limited  to, an  operating
                  statement,   an  income   statement,   a  balance   sheet,   a
                  reconciliation of equity amounts,  a source and application of
                  funds report,  and such other matters as Banks may request.  A
                  Compliance Certificate,  dated as of Seitel's fiscal year end,
                  signed by a  Responsible  Officer of Seitel shall be submitted
                  contemporaneously with the foregoing financial statements;

                  As soon as available, and in any event within 45 days from the
                  end of each  fiscal  quarter  of Seitel,  internally  prepared
                  financial  statements  for  Seitel,  on  a  consolidating  and
                  consolidated  basis,  signed  by a  Responsible  Officer,  and
                  showing  the  results of its  operations  during  such  fiscal
                  quarter,  which  statements  shall  include,  but shall not be
                  limited to, an operating  statement,  an income  statement,  a
                  balance sheet,



                                       54

<PAGE>



                  profit and loss statement, and such other matters as Banks may
                  reasonably request;

                  As soon as available, and in any event within 45 days from the
                  end of  each  fiscal  quarter  of  Seitel  which  is not  also
                  Seitel's fiscal year end, a Compliance Certificate dated as of
                  the end of such fiscal quarter, signed and certified by a duly
                  authorized officer of Seitel;

                  On or before the 15th day of each calendar month or more often
                  as requested by Banks,  a Borrowing  Base Report  supported by
                  the  following,  each on a form  satisfactory  to  Banks:  (A)
                  account   receivable   agings   for   Data,   Seitel,   Exsol,
                  Geophysical,   and  Digitel;  (B)  listing  of  Seitel's  term
                  receivables  (including a listing of related payment terms and
                  a listing of all payments  received with respect thereto since
                  the  last  listing);   (C)  account  payable  aging  for  each
                  Borrower;  (D) rebate listing for each Borrower;  (E) detailed
                  calculation  of  all  Accounts  which  do  not  constitute  an
                  Eligible Accounts;  and (F) any other information  relating to
                  the foregoing, as may be required by Banks;

                  On or  before  the  forty-fifth  (45th)  day of each  calendar
                  quarter,  Borrowers'  Benchmark Analysis Report and Summary of
                  Data Banks  Report,  in form  reasonably  acceptable to Banks,
                  detailing  Seismic Data and Eligible  Inventory as of the last
                  day of the immediately preceding calendar quarter;

                  Within 10 days  after  the  execution  thereof,  copies of all
                  contracts,  letter  agreements,  notes, and other  instruments
                  providing  for the  time and  manner  of the  payment  of term
                  receivables  (i.e.,  payable in  multiple  installments,  as a
                  deferred payment, or on terms other than 30 days);



                                       55

<PAGE>




                  As and when requested by any Bank, copies of all Participation
                  Agreements,  joint  venture and  partnership  agreements,  and
                  Licensing Agreements; and

                  Such other documents, instruments, data, or information of any
                  type  requested by any Bank with respect to Accounts,  Seismic
                  Data, and any other Collateral, including, without limitation,
                  information   regarding   Offshore,   Digitel,   the   Digitel
                  Agreement,  and any  and  all  cash  distributions  and  other
                  payments now or hereafter  due in  connection  with any of the
                  foregoing.

         Any  information  or  documents  delivered  Banks  hereunder,   whether
         addressed  to either or both Banks,  may be relied upon by each Bank to
         the  same  extent  as  if  the   information   or  documents,   or  any
         certification by Borrowers with respect thereto, were addressed to both
         Banks.

                  (f) Federal Reporting. Concurrently with the submission of the
         quarterly   financial   statements   submitted   pursuant   to  Section
         7.1(e)(ii),  provide  Banks  with a true and  correct  copy of the 10-Q
         report filed by Seitel for such fiscal quarter,  and concurrently  with
         the submission of the annual Financial  Statement submitted pursuant to
         Section  7.1(e)(i),  provide  Banks with a true and correct copy of the
         10-K Report filed by Seitel for such fiscal year.  Within 30 days after
         the filing  thereof,  Seitel  shall  provide to Banks copies of its 8-K
         Report or any other  documents filed by (or on behalf of) Seitel or any
         other  Borrower  with the  Securities  and Exchange  Commission  or any
         similar  state  agency.  Further,  Seitel shall deliver to Banks within
         five days after any material  report (other than financial  statements)
         or other  communication is sent by Seitel or any of its Subsidiaries to
         their respective  stockholders or any other report,  request, or notice
         is filed by Seitel or any of its  Subsidiaries  with the Securities and
         Exchange   Commission  or  any  successor  or  analogous   Governmental
         Authority, copies of such report or communication;

                  (g)  Decrease  in  Value.   Promptly  upon  any  reduction  or
         diminution  in the face value of any  Account,  Borrowers  shall advise
         Banks thereof and, if requested by either Bank, submit a signed writing
         to the Banks explaining the circumstances resulting in such reduction;




                                                    56

<PAGE>



                  (h) Movement of Inventory.  Prior to moving any Inventory, for
         any purpose other than the sale thereof, into any location,  other than
         a location in which any Borrower has heretofore disclosed in writing to
         Banks,  any Borrower shall (i) promptly inform Banks of such move, (ii)
         execute and  deliver  appropriate  financing  statements  necessary  to
         perfect the security interest granted in the Security  Agreement in the
         particular  state in which the  Inventory  is to be located,  and (iii)
         cause the landlord, tenant, and/or subtenant at the particular location
         to execute and deliver to Banks a lien  waiver,  in form and  substance
         satisfactory to Banks;

                  (i)  Location of Records.  Give Banks  written  notice of each
         office of  Borrowers  at which  Seismic  Data and records of  Borrowers
         pertaining to Accounts,  Seismic Data, General Intangibles and contract
         rights are kept.  Except as such notice is given,  all Seismic Data and
         records of Borrowers  pertaining to Seismic Data, Accounts  Receivable,
         General  Intangibles  and  contract  rights  are and  shall  be kept at
         Borrowers'  respective  chief  executive  offices as noted on the first
         page of this Agreement  (which Borrowers have represented and warranted
         are Borrowers' respective chief executive offices);

                 (j)  Bankruptcy  Code.  Notify  Banks of any  filing  under the
          Bankruptcy  Code by, for or against  any of  Borrowers  within two (2)
          business days of having knowledge of such filing;

                  (k) Inspection. Up to one time a calendar year if prior to the
         occurrence  of an Event of  Default,  and at all times and from time to
         time after the  occurrence of an Event of Default,  allow Banks,  by or
         through  any  of  their   respective   officers,   agents,   employees,
         independent  contractors,  attorneys,  or accountants,  and at the sole
         cost and expense of Borrowers, (i) to examine,  inspect, audit, or make
         extracts  from  any  Borrower's  books  and  records;  (ii) to  analyze
         financial  statements;  (iii) to arrange for  verification  of Accounts
         under reasonable procedures,  directly with Account Debtors or by other
         methods;  and (iv) to inspect and audit  Inventory  and other  tangible
         property  constituting  Collateral at any time during  normal  business
         hours,  with at least three  Business  Days prior  notice  prior to the
         occurrence of an Event of Default,  or after the occurrence of an Event
         of Default  without prior notice to any Borrower;  provided that Banks,
         while performing any of the foregoing,  does not unreasonably interrupt
         Borrowers' normal business operations;

                 (l) Additional Notices.  Deliver to the Banks, immediately upon
          having  knowledge of the occurrence of any of the following  events or
          circumstances, a written


                                                    57

<PAGE>



         statement with respect thereto,  signed by a Responsible Officer of the
         notifying Borrower and setting forth the relevant event or circumstance
         and the steps being taken by the  applicable  Borrower  with respect to
         such event or circumstance:

                  a Default or any Event of Default;

                  any  default  or  event  of  default  under  any   contractual
                  obligation of any Borrower or any  litigation,  investigation,
                  or  proceeding  between  any  Borrower  and  any  Governmental
                  Authority  which, in either case, if not cured or if adversely
                  determined,  as the case may be, could  reasonably be expected
                  to have a Material Adverse Change;

                  any  litigation  or  proceeding  involving  any  or all of the
                  Borrowers  as a defendant  or in which any  Property of any or
                  all of the  Borrowers  is  subject to a claim and in which the
                  amount  involved  is  $500,000.00  or more,  and  which is not
                  covered by insurance or in which  injunctive or similar relief
                  is  sought  which  could  reasonably  be  expected  to  have a
                  Material Adverse Change;

                  the receipt by any Borrower of any
                  Environmental Complaint;

                  any  actual,   proposed,   or  threatened   testing  or  other
                  investigation  by any  Governmental  Authority or other Person
                  concerning the environmental condition of, or relating to, any
                  Property of any  Borrower  or adjacent to any  Property of any
                  Borrower  which  could  result in a Material  Adverse  Change,
                  following any allegation of a violation of any  Requirement of
                  Law;

                  any Release of Hazardous  Substances by such Borrower or from,
                  affecting,  or related to any  Property  of such  Borrower  or
                  adjacent to any Property of such  Borrower  which could result
                  in a  Material  Adverse  Change,  except  in  accordance  with
                  applicable



                                       58

<PAGE>



                  Requirements  of Law or the terms of a valid permit,  license,
                  certificate,   or  approval  of  the   relevant   Governmental
                  Authority,  or the violation of any Environmental  Law, or the
                  revocation,  suspension, or forfeiture of or failure to renew,
                  any permit, license, registration,  approval, or authorization
                  which could  reasonably be expected to have a Material Adverse
                  Change; and

                  any  other  event  or  condition  which  could  reasonably  be
                  expected to have a Material Adverse Change.

                  (m)  Legal  Expenses  of Banks.  Upon  request  by the  Agent,
         promptly  reimburse the Agent for all  reasonable  fees and expenses of
         Jackson & Walker,  L.L.P.,  special counsel to the Banks, in connection
         with  the   preparation  of  this   Agreement  and  all   documentation
         contemplated  hereby, the satisfaction of the conditions  precedent set
         forth herein,  the filing and recordation of any Credit Documents,  and
         the consummation of the transactions contemplated in this Agreement.

                  (n)  Reimbursement  of Certain  Expenses.  Upon request by the
         Agent, promptly reimburse the Agent (to the fullest extent permitted by
         law) for all amounts reasonably expended,  advanced,  or incurred by or
         on behalf of the Agent to satisfy any obligation of the Borrowers under
         any of the Credit  Documents;  to collect the  Liabilities;  to ratify,
         amend, restate, or prepare additional Credit Documents, as the case may
         be; for the filing and recordation of any Credit Documents;  to enforce
         the  rights of the  Agent  under any of the  Credit  Documents;  and to
         protect the Properties or business of any Borrower  including,  without
         limitation, the Collateral,  which amounts shall be deemed compensatory
         in nature and  liquidated  as to amount upon notice to the Borrowers by
         the Agent and which  amounts shall  include,  but not be limited to (i)
         all court costs, (ii) reasonable attorneys' fees, (iii) reasonable fees
         and  expenses  of  auditors  and  accountants  incurred  to protect the
         interests of the Agent,  (iv) fees and expenses  incurred in connection
         with the  participation  by the  Agent as a  member  of the  creditors'
         committee in a case commenced under any Insolvency Proceeding, (v) fees
         and expenses  incurred in connection  with lifting the  automatic  stay
         prescribed in ss.362 Title 11 of the United States Code,  and (vi) fees
         and expenses incurred in connection with any action pursuant to ss.1129
         Title 11 of the United States Code all reasonably incurred by the



                                       59

<PAGE>



         Agent in  connection  with the  collection  of any sums due  under  the
         Credit Documents, together with interest at the per annum interest rate
         equal to the Floating Rate, calculated on a basis of a calendar year of
         365 or 366 days, as the case may be, counting the actual number of days
         elapsed,  on each such  amount from the date of  notification  that the
         same was expended, advanced, or incurred by the Agent until the date it
         is  repaid  to the  Agent,  with the  obligations  under  this  Section
         surviving  the  non-assumption  of this  Agreement in a case  commenced
         under any  Insolvency  Proceeding  and being binding upon the Borrowers
         and/or a trustee,  receiver,  custodian,  or liquidator of the Borrower
         appointed in any such case;

                  (o)  Insurance.  Maintain  insurance  with  respect  to  their
         Properties and businesses against such liabilities,  casualties, risks,
         and  contingencies  as  is  customary  in  the  relevant  industry  and
         sufficient to prevent a Material Adverse Change,  all such insurance to
         be in amounts and from insurers reasonably acceptable to the Agent and,
         within  30 days of the  Closing  Date  for  property  damage  insurance
         covering  Collateral  and  business  interruption  insurance,  if  any,
         maintained by Borrowers,  naming the Agent as loss payee, and, upon any
         renewal of any such  insurance  and at other times upon  request by the
         Agent, furnish to the Agent evidence, satisfactory to the Agent, of the
         maintenance  of such  insurance.  The  Agent  shall  have the  right to
         collect,  and the  Borrowers  (individually  and  collectively)  hereby
         assign to the Agent,  any and all monies that may become  payable under
         any  policies of  insurance  relating to  business  interruption  or by
         reason of damage, loss, or destruction of any of the Collateral. In the
         event of any damage,  loss, or destruction for which insurance proceeds
         relating to business interruption or Collateral exceed $500,000.00, the
         Agent  may,  at its  option,  apply all such  sums or any part  thereof
         received by it toward the payment of the  Liabilities,  whether matured
         or  unmatured,  application  to be made first to  interest  and then to
         principal,  and shall  deliver to the  Borrowers  the balance,  if any,
         after such  application has been made. In the event of any such damage,
         loss, or destruction  for which  insurance  proceeds are $500,000.00 or
         less, provided that no Event of Default has occurred and is continuing,
         the  Agent  shall  deliver  any  such  proceeds  received  by it to the
         Borrowers.  In the event  the Agent  receives  insurance  proceeds  not
         attributable  to Collateral or business  interruption,  the Agent shall
         deliver any such proceeds to the Borrowers.

                 (p) INDEMNIFICATION. INDEMNIFY AND HOLD THE AGENT AND BANKS AND
          THEIR   SHAREHOLDERS,    OFFICERS,   DIRECTORS,   EMPLOYEES,   AGENTS,
          ATTORNEYS-IN-FACT,  AND AFFILIATES AND EACH TRUSTEE FOR THE BENEFIT OF
          THE AGENT AND BANKS UNDER


                                       60

<PAGE>



         ANY CREDIT  DOCUMENT  HARMLESS  FROM AND  AGAINST  ANY AND ALL  CLAIMS,
         LOSSES, DAMAGES, LIABILITIES, FINES, PENALTIES, CHARGES, ADMINISTRATIVE
         AND  JUDICIAL  PROCEEDINGS  AND ORDERS,  JUDGMENTS,  REMEDIAL  ACTIONS,
         REQUIREMENTS  AND  ENFORCEMENT  ACTIONS OF ANY KIND,  AND ALL COSTS AND
         EXPENSES   INCURRED  IN  CONNECTION   THEREWITH   (INCLUDING,   WITHOUT
         LIMITATION,   ATTORNEYS'  FEES  AND  EXPENSES),   ARISING  DIRECTLY  OR
         INDIRECTLY, IN WHOLE OR IN PART, FROM (i) THE PRESENCE OF ANY HAZARDOUS
         SUBSTANCES ON, UNDER,  OR FROM ANY PROPERTY OF THE  BORROWERS,  WHETHER
         PRIOR TO OR DURING THE TERM  HEREOF,  (ii) ANY  ACTIVITY  CARRIED ON OR
         UNDERTAKEN ON OR OFF ANY PROPERTY OF THE BORROWERS, WHETHER PRIOR TO OR
         DURING THE TERM HEREOF, AND WHETHER BY THE BORROWERS OR ANY PREDECESSOR
         IN  TITLE,  EMPLOYEE,   AGENT,  CONTRACTOR,  OR  SUBCONTRACTOR  OF  THE
         BORROWERS OR ANY OTHER PERSON AT ANY TIME  OCCUPYING OR PRESENT ON SUCH
         PROPERTY, IN CONNECTION WITH THE HANDLING, TREATMENT, REMOVAL, STORAGE,
         DECONTAMINATION,  CLEANUP, TRANSPORTATION, OR DISPOSAL OF ANY HAZARDOUS
         SUBSTANCES  AT ANY TIME  LOCATED OR PRESENT ON OR UNDER SUCH  PROPERTY,
         (iii)  ANY  RESIDUAL  CONTAMINATION  ON OR UNDER  ANY  PROPERTY  OF THE
         BORROWERS,  (iv) ANY CONTAMINATION OF ANY PROPERTY OR NATURAL RESOURCES
         ARISING IN CONNECTION  WITH THE  GENERATION,  USE,  HANDLING,  STORAGE,
         TRANSPORTATION OR DISPOSAL OF ANY HAZARDOUS SUBSTANCES BY THE BORROWERS
         OR ANY EMPLOYEE,  AGENT, CONTRACTOR,  OR SUBCONTRACTOR OF THE BORROWERS
         WHILE SUCH  PERSONS ARE ACTING  WITHIN THE SCOPE OF THEIR  RELATIONSHIP
         WITH THE BORROWERS, IRRESPECTIVE OF WHETHER ANY OF SUCH ACTIVITIES WERE
         OR WILL BE UNDERTAKEN IN ACCORDANCE  WITH  APPLICABLE  REQUIREMENTS  OF
         LAW, OR (v) THE PERFORMANCE AND ENFORCEMENT OF ANY CREDIT DOCUMENT, ANY
         ALLEGATION BY ANY  BENEFICIARY OF A WRONGFUL  DISHONOR BY THE AGENT AND
         BANKS OF A CLAIM OR DRAFT PRESENTED THEREUNDER (TO THE EXTENT RESULTING
         FROM A GOOD FAITH DISPUTE OF THE AMOUNT OF THE BORROWING  BASE), OR ANY
         OTHER GOOD FAITH ACT OR OMISSION IN  CONNECTION  WITH OR RELATED TO ANY
         CREDIT DOCUMENT OR THE TRANSACTIONS  CONTEMPLATED  THEREBY,  INCLUDING,
         WITHOUT  LIMITATION,  ANY OF THE FOREGOING IN THIS SECTION ARISING FROM
         NEGLIGENCE,  WHETHER SOLE OR  CONCURRENT,  ON THE PART OF THE AGENT AND
         BANKS OR ANY OF THEIR  SHAREHOLDERS,  OFFICERS,  DIRECTORS,  EMPLOYEES,
         AGENTS, ATTORNEYS-IN-FACT, OR AFFILIATES OR ANY TRUSTEE FOR THE BENEFIT
         OF THE  AGENT  AND  BANKS  UNDER  ANY  SECURITY  INSTRUMENT;  WITH  THE
         FOREGOING INDEMNITY  SURVIVING  SATISFACTION OF ALL OBLIGATIONS AND THE
         TERMINATION OF THIS AGREEMENT,  UNLESS ALL SUCH  OBLIGATIONS  HAVE BEEN
         SATISFIED  WHOLLY  IN  CASH  FROM  THE  BORROWERS  AND  NOT  BY  WAY OF
         REALIZATION AGAINST ANY COLLATERAL OR THE CONVEYANCE OF ANY PROPERTY IN
         LIEU THEREOF,  PROVIDED THAT SUCH INDEMNITY SHALL NOT EXTEND TO ANY ACT
         OR  OMISSION  BY THE AGENT  AND  BANKS  WITH  RESPECT  TO ANY  PROPERTY
         SUBSEQUENT  TO THE AGENT AND BANKS  BECOMING THE OWNER OF SUCH PROPERTY
         AND WITH RESPECT TO WHICH PROPERTY SUCH CLAIM, LOSS, DAMAGE, LIABILITY,
         FINE,



                                                    61

<PAGE>



          PENALTY, CHARGE,  PROCEEDING,  ORDER, JUDGMENT, ACTION, OR REQUIREMENT
          ARISES SUBSEQUENT TO THE ACQUISITION OF TITLE THERETO BY THE AGENT AND
          BANKS.

                  (q) Operating Account.  Cause Seitel to maintain with Agent or
         its affiliate designated by Agent an operating account,  which may be a
         controlled disbursement account, and Agent, at Agent's option, may make
         all advances hereunder into such operating  account,  and each Borrower
         expressly  agrees  that Agent  may,  at  Agent's  option,  and with the
         authorization  of the Required  Banks,  debit  against  such  operating
         account any and all sums, amounts,  charges,  and payments due under or
         in connection with this Agreement and the Notes;

                  (r) Comply With Law. At all times  comply with all present and
         future  Requirements  of Law  applicable  to,  governing  or  affecting
         Borrowers,  their operations,  their Property,  the Collateral,  or any
         part  of  any  of  the  foregoing,  which  violation  or  noncompliance
         individually or collectively might cause a Material Adverse Change, and
         shall  immediately  notify  Banks of any and all  alleged  or  asserted
         violations  of  any  such  law,   ordinance,   or   regulation,   which
         individually or collectively might cause a Material Adverse Change;

                 (s)  Qualify  as  Foreign  Corporation.  Qualify  as a  foreign
          corporation  in all other  jurisdictions  wherein the  business now or
          hereafter   transacted  by  any  Borrower  makes  such  qualifications
          necessary,  and the  failure  to so  qualify  might  cause a  Material
          Adverse Change;

                  (t)  Maintain  Backup  Data.  Maintain  any system  reasonably
         requested  by Banks for  creating  backup  data on  computer  hardware,
         software,  or firmware,  such as lists of Account Debtors and Accounts;
         and pledge,  and,  after any Default  hereunder,  deliver to Banks such
         tapes or discs with respect thereto as may be required by Banks;

                  (u) Further  Assurances.  (i) Promptly correct, or cause to be
         promptly  corrected,  any  defect,  error,  or  omission  which  may be
         discovered in the contents of this Agreement or in any other instrument
         executed in connection  herewith or in the execution or  acknowledgment
         thereof; and (ii) execute, acknowledge, deliver, and record or file, or
         cause to be executed,  acknowledged,  delivered, and recorded or filed,
         such further instruments, and do such further acts as may be necessary,
         desirable, or proper to carry out more effectively the purposes of this
         Agreement and such other instruments; and

                 (v) Landlord's Waivers. Within 120 days from the execution date
          of this Agreement, provide Banks with


                                       62

<PAGE>



         landlord's  waivers (in a form  acceptable to Banks) from each landlord
         of a location  of any  Borrower at which any  Collateral  is or will be
         stored and for which Banks (or their predecessors in interest) have not
         previously   obtained  a  landlord's   waiver  (it  being  agreed  that
         Borrower's lease of its main headquarters in Houston,  Texas,  which is
         at the address listed on page 1 hereof may contain a landlord's  waiver
         for purposes of satisfying this subsection).


                                   SECTION 8
                               NEGATIVE COVENANTS

                 8.1 Negative  Covenants of Borrowers.  So long as Borrowers may
borrow  additional  advances  hereunder  and in  accordance  with the  terms and
provisions  of this  Agreement  and until  payment  in full of the Notes and the
payment  and  performance  of all  other  Liabilities  of  Borrowers  hereunder,
Borrowers (individually and collectively) covenant and agree, unless Banks shall
otherwise  consent in  writing,  that no  Borrower  shall,  either  directly  or
indirectly (for purposes hereof, actions of DDD Energy, Inc. shall not be deemed
to be direct or indirect actions of Seitel or any other Borrower:

                  (a) Change of Location.  Change any office or location without
         (i) at least thirty (30) days prior written  notice to Banks,  and (ii)
         prior to making any such change,  executing and delivering to Banks any
         additional  financing  statements  or other  documents  that  Banks may
         request;

                  (b)  No  Transfer  of  Collateral.   Sell,  transfer,   lease,
         otherwise  dispose  of, or suffer  to exist  any lien,  charge,  claim,
         security  interest,  or encumbrance  (except for Permitted Liens and as
         otherwise  expressly  provided  herein)  with  respect  to,  any of the
         Collateral  or any interest  therein (or any of the  Proceeds  thereof,
         whether  money,  checks,  money  orders,  drafts,  notes,  instruments,
         documents, chattel paper, Accounts, returns, or repossessions);

                  (c) No  Change  in  Accounting  Practices.  Materially  change
         accounting practices, methods, or standards or the reporting format for
         any information  furnished Banks under the terms and provisions of this
         Agreement (unless required by GAAP),  which accounting  practices shall
         conform with GAAP throughout the term of this Agreement;

                 (d) No  Purchase of Stock.  Purchase  or  acquire,  directly or
          indirectly,  any shares of stock, evidences of indebtedness,  or other
          securities of any person,  corporation,  or other  entity,  other than
          acquisitions of


                                       63

<PAGE>



          stock or securities  of entities as a means of acquiring  Seismic Data
          in accordance with Section 8.1(n)(ii) below;

                  (e) No  Change  in  Ownership.  Permit  Seitel,  or any of its
         Subsidiaries  (other  than DDD  Energy,  Inc.),  to (i)  liquidate,  or
         discontinue or materially reduce their normal operations with intention
         to liquidate,  (ii) merge or consolidate  with or into any corporation,
         partnership,  or other  entity,  or (iii)  sell,  lease,  transfer,  or
         otherwise  dispose of (other than in the ordinary  course of business),
         in any  single  instance  (or in any  group of  related  transactions),
         assets  greater  than the  amount  of  $500,000.00,  in the  aggregate.
         Borrowers  shall not cause,  allow,  or suffer to occur a change in the
         ownership or nature of any Borrower  (other than  Seitel).  No Borrower
         shall  change  its name or  identity  without  notifying  Banks of such
         change in writing at least thirty (30) days prior to the effective date
         of such change and such Borrower shall take all steps  necessary  prior
         to any such change to maintain at all times the  validity,  perfection,
         and priority of all liens and security  interests  contemplated  by and
         created in this Agreement;

                  (f) No Payment of Subordinated Debt. Make any payment upon any
         outstanding  Subordinated Debt, except as expressly  permitted by Banks
         in writing,  other than the approximately  $208,000.00 payment required
         to be made into the sinking fund for the Subordinated  Debt on or about
         March 31,  1997,  which may be made so long as no  Default  or Event of
         Default  shall  have  occurred  and be  continuing  at the time of such
         payment or be caused by such payment;

                  (g) Current Ratio. Permit Seitel to cause, allow, or suffer to
         occur its  Current  Ratio to be less than 1.0 to 1. The  Current  Ratio
         shall be  tested  quarterly  as of the end of each  fiscal  quarter  of
         Seitel. For purposes of this subsection, "Current Ratio" shall mean the
         ratio  of  Current  Assets  to  Current   Liabilities,   calculated  in
         accordance  with GAAP;  provided that, for purposes of this  Agreement,
         the consolidated Current Assets and Current Liabilities of Seitel shall
         not include current assets and current liabilities of DDD Energy, Inc.;

                  (h) Debt to Tangible Net Worth Ratio.  Permit Seitel to cause,
         allow, or suffer to occur its  consolidated  Debt to Tangible Net Worth
         Ratio to exceed 1.0 to 1. The Debt to Tangible Net Worth Ratio shall be
         tested  quarterly as of the end of each fiscal  quarter of Seitel.  For
         purposes of this  subsection,  "Debt to Tangible Net Worth Ratio" shall
         mean the ratio of Seitel's  Consolidated Total Debt to the consolidated
         Tangible  Net  Worth  of  Seitel.  For  purposes  of  this  subsection,
         "Seitel's Consolidated Total Debt" shall mean



                                       64

<PAGE>



         all of Seitel's  consolidated  indebtedness  and  liabilities  owing to
         Banks  (or  either  of  them),  or any  other  Person,  whether  now or
         hereafter existing, created or arising, absolute or contingent,  direct
         or  indirect,  joint or several,  but  excluding,  for purposes of this
         Agreement,  the  Subordinated  Debt.  For  purposes of this  Agreement,
         indebtedness and liabilities and tangible net worth of DDD Energy, Inc.
         (including  retained  earnings of DDD Energy,  Inc. and advances to and
         investments in DDD Energy, Inc. by Seitel and its Affiliates) shall not
         be included in the calculation of the foregoing ratio;

                  (i) Cash Flow Coverage Ratio.  Permit Seitel to cause,  allow,
         or suffer to occur its consolidated Cash Flow Coverage Ratio to be less
         than  2.5 to 1. The  Cash  Flow  Coverage  Ratio  shall  be  calculated
         quarterly as of the end of each fiscal quarter of Seitel.  For purposes
         of this subsection,  "Cash Flow Coverage Ratio" shall mean the ratio of
         (i)  Cash  Flow  for  the  12  month  period   preceding  the  date  of
         calculation,  to (ii) Current  Maturities for such period. For purposes
         of this subsection,  "Cash Flow" shall mean, for any period, the sum of
         Seitel's Net Income for such period,  plus depreciation,  amortization,
         and  other   non-cash   expenses  for  such  period   deducted  in  the
         determination  of Seitel's  Net Income for such period,  less  Seitel's
         non-cash  income for such  period.  For  purposes  of this  subsection,
         "Current   Maturities"  shall  mean  the  sum  of  1/5  of  the  lowest
         outstanding principal balance of the Revolving Line during the 12-month
         period  preceding the date of  calculation,  plus  scheduled  principal
         payments made by any Borrower during the 12-month period  preceding the
         date of calculation.  The cash flow and scheduled principal payments of
         DDD Energy,  Inc. shall not be included in the  calculation of the Cash
         Flow Coverage Ratio;

                  (j)  Transactions  with  Affiliates.  Directly or  indirectly,
         enter into any transaction  (including the sale,  lease, or exchange of
         Property or the  rendering of service) with any  Affiliate,  other than
         upon fair and reasonable terms no less favorable than could be obtained
         in an  arm's  length  transaction  with  a  Person  which  was  not  an
         Affiliate,  with the  exception  of  transactions  among Seitel and its
         Subsidiaries  at cost,  which shall not be subject to the terms of this
         subsection;

                  (k)   Consolidated   Tangible  Net  Worth.   Permit   Seitel's
         Consolidated   Tangible   Net   Worth  to  be  less  than  the  sum  of
         $80,000,000.00,  plus  50% of  positive  Net  Income  for all  calendar
         quarterly  periods  subsequent to September 30, 1994,  plus 100% of all
         equity raised by Seitel after  September  30, 1994,  plus the net asset
         value



                                       65

<PAGE>



          of Polymer Dynamics, Inc. as of the closing of the acquisition thereof
          as described in Section 8.1(n);

                 (l)  No   Additional   Debt.   Permit  Seitel  or  any  of  its
          Subsidiaries (other than to DDD Energy,  Inc.) to borrow any money, or
          otherwise incur any additional indebtedness of any kind, except for:

                  trade credit on open account in the
                  ordinary course of business;

                  obligations relating to Seitel's
                  Guaranty of DDD Energy, Inc.'s
                  obligations under the DDD Credit
                  Agreement;

                  intercompany loans to the extent
                  permitted in accordance with the
                  terms and provisions of Section
                  8.1(o);

                  indebtedness not to exceed
                  $1,000,000.00, in the aggregate
                  annually;

                  obligations relating to Seitel's
                  guaranty of obligations incurred by
                  DDD Energy, Inc. in the acquisition
                  of up to $350,000 worth of computer
                  work stations and related equipment
                  to be purchased or leased by DDD
                  Energy, Inc. within six months after
                  the Closing Date; and

                  up to $350,000.00 in indebtedness to
                  be incurred within six months after
                  the Closing Date for the acquisition
                  and improvements thereto of real
                  property by Polymer Dynamics, Inc.
                  for a warehouse and manufacturing
                  facility in Harris County, Texas, to
                  be used by Polymer Dynamics, Inc. in
                  its business.


         Without  limiting the  foregoing,  none of Borrowers  (individually  or
         collectively)  will obtain any loans in addition to the Revolving  Line
         and the  Geophysical  Loan (as each may be amended or refinanced)  from
         either  Bank  without the  express  written  consent of the other Bank.
         Except pursuant to the terms of the Seitel Geophysical Guaranty and the
         Seitel DDD Guaranty,  and except for the limited  guaranty entered into
         by Seitel in  connection  with the Opseis  Eagle Lease (as such term is
         defined in



                                       66

<PAGE>



         subsection  (g)  of  the  definition  of  Permitted  Liens)  and  other
         guaranties entered into by Seitel in the ordinary course of business in
         favor  of  unrelated   third  parties  to  guarantee  the   contractual
         obligations  (excluding the  obligations to pay or repay borrowed funds
         or capital lease  obligations) of its  Subsidiaries,  none of Borrowers
         (individually or collectively)  shall guarantee any indebtedness of any
         other Person;

                  (m) No  Transfer  of Seismic  Data.  Permit  Seitel or Data to
         sell,  assign,  or transfer  any Seismic  Data to any Person other than
         Banks  (other  than  non-exclusive  licenses  of  Seismic  Data  in the
         ordinary  course of  business)  or to in any way  encumber  the Seismic
         Data, except to Banks;  provided that Seitel may transfer its data bank
         to Data effective December 31, 1994;

                  (n)  No   Acquisitions   of  Other   Entities.   Acquire   any
         corporation,  partnership,  or other entity (or any interest  therein),
         except  for (i) the  equity  investments  by  Seitel  in  wholly  owned
         Subsidiaries of the net cash proceeds  received by Seitel from the sale
         of  Seitel  equity  securities  on or  after  June 1,  1994,  (ii)  the
         acquisitions  by Seitel and its  Subsidiaries  of  Seismic  Data in the
         ordinary  course of  business  not  exceeding  a cost to Seitel and its
         Subsidiaries  of more than  $5,000,000.00  annually  in the  aggregate,
         whether by stock or asset  purchase or  acquisition  or otherwise,  and
         (iii)  the   acquisition   by  Polymer   Dynamics,   Inc.,  a  Delaware
         corporation,  of substantially  all of the assets of Polymer  Dynamics,
         Inc., a Texas corporation, in exchange for Seitel common stock;

                  (o) No Loans or  Advances.  Make,  extend,  or allow to remain
         outstanding  any loans or advances to or investments in (i) any Persons
         which are not an Affiliate  (except in the ordinary course of business)
         (ii)  DDD  Energy,   Inc.   after  December  31,  1994,  in  excess  of
         $25,000,000.00,  in the aggregate; provided that during any period when
         the loans from the Banks set forth in the DDD Credit  Agreement are not
         outstanding  (including  if such  transaction  fails to  close  for any
         reason),  Borrower  shall,  within five Business  Days after  obtaining
         knowledge  thereof,  notify Banks in writing of the  occurrence  of any
         default by DDD Energy,  Inc. in its timely payment of any indebtedness,
         and from and  after the date on which  they  obtain  knowledge  thereof
         (until such  default is waived or fully  cured),  advances and loans to
         DDD Energy,  Inc. shall be limited to an additional  $3,000,000.00 (but
         in no event shall aggregate  loans and advances to DDD Energy,  Inc. be
         in excess of  $25,000,000.00),  and (iii) any parent,  non-wholly owned
         subsidiaries,  shareholders,  owners, directors,  employees,  officers,
         management, or other related persons or



                                       67

<PAGE>



         entities exceeding $3,000,000.00 in the aggregate at any one time
         outstanding;

                  (p) No  Dividends  or  Distributions.  Declare,  pay, or make,
         whether  in  cash  or  Property  of  the  Borrower,   any  dividend  or
         distribution on, or purchase,  redeem,  or otherwise acquire for value,
         any share of any class of its  capital  stock at any time that an Event
         of Default exists or would exist upon such payment;

                 (q) No  Change  in  Basic  Business.  Expand  into  any line of
          business other than those in which a particular Borrower is engaged as
          of the date hereof (other than as specifically permitted herein);

                 (r)  Purpose.  Permit the  proceeds of the Notes to be used for
          any purpose  other than the  purposes set forth in Section 3.7 of this
          Agreement;

                  (s) Permitted  Transactions.  Enter into any transaction which
         materially and adversely affects or may materially and adversely affect
         any of the Collateral or Borrower's  ability to pay the  Liabilities or
         permit or agree to any material extension, compromise, or settlement or
         make any  material  change or  modification  of any kind or nature with
         respect to any Account,  including any of the terms  relating  thereto,
         other than extensions, discounts, and allowances in the ordinary course
         of business; and

                  (t) No Purchase of Margin Security. Own, purchase, or acquire,
         (or enter into any  contract  to  purchase  or  acquire),  any  "margin
         security" as defined by any regulation of the Federal  Reserve Board as
         now in effect or as the same may hereafter be in effect  unless,  prior
         to any such purchase or acquisition or entering into any such contract,
         Banks  shall have  received an opinion of counsel  satisfactory  to the
         effect that such purchase or acquisition  will not cause this Agreement
         to  violate  Regulations  G, T, U or X or any other  regulation  of the
         Federal Reserve Board then in effect.


                                   SECTION 9
                        EVENTS OF DEFAULT; ACCELERATION

                 9.1  Events  of  Default.  Each of the  following  shall and do
constitute an event of default (the "Events of Default")  under and for purposes
of this Agreement:

                 (a) Payment Defaults. Default shall be made in the payment when
          due of any installments of principal or interest or other payments due
          under this  Agreement or the Notes,  or in the payment when due of any
          fee or other


                                                    68

<PAGE>



         sum payable under any Credit Document and the default as to interest or
         fees  shall  remain  uncured  for a period in excess of three  Business
         Days;

                  (b) Non Performance of Covenants. Default shall be made by any
         Borrower in the due observance or performance of any of its obligations
         under the Credit Documents, and such default shall continue for 30 days
         after the earlier of notice  thereof to the Borrowers by the Agent,  at
         the  request  of  the  Required  Banks,  or  knowledge  thereof  by the
         Borrowers;  provided that such 30 day notice shall not be required with
         respect to any payment default described in Section 9.1(a) or any other
         Event of Default  specifically  enumerated  in any other  subsection of
         this Section 9.1;

                 (c) Failure to Pay Insurance Payments.  Failure of Borrowers to
          pay when any premium on (i) any insurance  policy assigned to Agent or
          the Banks, or (ii) any insurance  covering any Collateral,  within any
          applicable grace period;

                 (d) Non Compliance With Inspections. Failure of any Borrower to
          fully comply with the terms and provisions of Section 7.1(k);

                  (e) Meeting of Creditors. Calling of a meeting of creditors of
         any  Borrower by any Borrower  (or  attended by any  Borrower)  for the
         purpose of seeking  the  appointment  of a state  court  receiver  with
         respect to any  Borrower  or its assets,  the filing of an  involuntary
         bankruptcy  case against any  Borrower,  or for any other purpose which
         materially  impairs  the Banks'  Collateral  or the  likelihood  of the
         Borrowers'  fully paying and  performing  the  Liabilities  in a timely
         manner;

                 (f) Changes in  Ownership or Senior  Management.  Any change in
          the nature of the business of any Borrower or in the senior management
          of  Seitel  (which  shall be  defined  herein  as Paul  Frame,  Horace
          Calvert,  and Debra Valice) or  acquisition  by any Person or group of
          Persons  acting  together of more than 50% of the  outstanding  voting
          stock of any Borrower without the prior written consent of Banks;

                 (g) Fraud.  Fraud or  misrepresentation  by or on behalf of any
          Borrower in its transactions with any Bank;

                 (h)  Termination  of  Credit  Document.  A  bankruptcy  trustee
          attempts to  terminate,  or any other  Person  terminates,  any Credit
          Document or other  agreements  between  Borrowers (or any of them) and
          Banks;



                                       69

<PAGE>



                  (i) Breach of Warranty or  Representation.  Any representation
         or warranty made by any Borrower in any of the Credit  Documents proves
         to have been  untrue in any  material  respect  or any  representation,
         statement  (including  Financial  Statements),   certificate,  or  data
         furnished or made to Banks as an inducement for Banks agreeing to enter
         in  to  this  Agreement,  or in  accordance  with  the  terms  of  this
         Agreement, proves to have been untrue in any material respect as of the
         date the facts therein set forth were stated or certified;

                  (j)  Default in Other  Obligations.  Failure by any  Borrower,
         whether as principal or  guarantor or other  surety,  to pay or perform
         under any bond,  capital lease,  debenture,  note, or other evidence of
         indebtedness, or under any credit agreement, loan agreement, indenture,
         joint  venture  agreement,  promissory  note,  or similar  agreement or
         instrument  executed in connection  with any of the foregoing,  and the
         aggregate  amount of  indebtedness  related to such default or defaults
         shall exceed $500,000.00, and such defaults shall remain unremedied for
         in excess of the period of grace,  if any,  with respect  thereto.  The
         foregoing  sentence  shall  not  apply  to any  default  to  which  the
         existence  thereof is being  diligently  disputed or  contested in good
         faith, but only to the extent the applicable Borrower has made adequate
         reserves therefor.  Notwithstanding  the foregoing,  the failure (i) of
         Geophysical to fully perform under and in accordance  with the terms of
         the Geophysical  Loan Documents,  (ii) of Seitel to fully perform under
         and in accordance with the terms of the Seitel Geophysical Guaranty and
         the Seitel DDD  Guaranty,  or (iii) of Offshore to fully  perform under
         and in  accordance  with  the  terms  and  provisions  of  the  Digitel
         Agreement, shall constitute an Event of Default hereunder;

                 (k) Failure to Satisfy Condition Precedent.  Borrowers shall be
          unable to fully,  completely,  and timely  satisfy any  condition to a
          requested  advance as specified in Section 2, and such inability shall
          continue for a period of 30 consecutive days;

                  (l) Insolvency. Any Borrower shall (i) apply for or consent to
         the appointment of a receiver,  trustee or liquidator of it or all or a
         substantial  part  of  its  assets,  (ii)  file  a  voluntary  petition
         commencing a bankruptcy or other  insolvency  proceeding,  (iii) make a
         general  assignment  for the benefit of creditors,  (iv) be unable,  or
         admit in writing its inability, to pay their respective debts generally
         as they  become  due,  or (v) file an  answer  admitting  the  material
         allegations  of a petition  filed  against it in a bankruptcy  or other
         Insolvency Proceeding;



                                       70

<PAGE>




                  (m)  Insolvency  Proceedings.  An order,  judgment,  or decree
         shall be  entered  against  any  Borrower  by any  court  of  competent
         jurisdiction or by any other duly authorized authority, on the petition
         of  a  creditor  or  otherwise,   granting  relief  in  any  Insolvency
         Proceeding  or  approving  a  petition  seeking  reorganization  or  an
         arrangement   of  its  debts  or   appointing   a  receiver,   trustee,
         conservator,  custodian,  or liquidator of it or all or any substantial
         part of its assets,  and such order,  judgment,  or decree shall not be
         dismissed or stayed within 60 days;

                  (n) Levy on Property. The levy against any significant portion
         of  the  Property  of  any  Borrower  or  any  execution,  garnishment,
         attachment, sequestration, or other writ or similar proceeding which is
         not permanently dismissed or discharged within 60 days after the levy;

                  (o)  Final  Orders,   Judgments,  and  Decrees.  A  final  and
         non-appealable  order,  judgment,  or decree  shall be entered  against
         Borrowers  (individually  or  collectively)  for money  damages  and/or
         indebtedness  due in an  amount  in  excess  of  $1,250,000.00,  in the
         aggregate and such order, judgment, or decree shall not be dismissed or
         stayed within 60 days;

                  (p) Governmental  Charges.  Any charges are filed or any other
         action  or  proceeding  is  instituted  by any  Governmental  Authority
         against  any  Borrower  under the  Racketeering  Influence  and Corrupt
         Organizations  Statute (18 U.S.C. ss.1961 et seq.), the result of which
         could be the  forfeiture  or transfer of any material  Property of such
         Borrower  subject  to  a  Lien  in  favor  of  the  Banks  without  (i)
         satisfaction  or provision for  satisfaction of such Lien, or (ii) such
         forfeiture or transfer of such Property being expressly made subject to
         such Lien;

                  (q)  Fraudulent   Transfers.   Any  Borrower  shall  have  (i)
         concealed, removed, or diverted, or permitted to be concealed, removed,
         or diverted, any part of its Property, with intent to hinder, delay, or
         defraud its creditors or any of them,  (ii) made or suffered a transfer
         of any of its  Property  which  is  fraudulent  under  any  bankruptcy,
         fraudulent  conveyance,  or similar law, (iii) made any transfer of its
         Property  to or for the  benefit  of a  creditor  at a time when  other
         creditors  similarly  situated  have not been paid,  or (iv) shall have
         suffered or permitted,  while insolvent,  any creditor to obtain a Lien
         upon any of its Property  through legal  proceedings or distraint which
         is not vacated within 60 days from the date thereof;

                 (r)  Not a  First  Security  Interest.  Any  security  interest
          granted herein or in any other Credit Document


                                       71

<PAGE>



         against any Collateral, which in the aggregate may reasonably be valued
         by Banks to be in excess of $1,000,000.00, shall for any reason not, or
         cease to, create valid and perfected  first-priority  Liens against any
         Collateral  (except for and  exclusive of Permitted  Liens and Accounts
         evidenced by  instruments  possession of which Banks have not requested
         hereunder);

                 (s)  Material  Adverse  Change.  The  occurrence  of a Material
          Adverse  Change and the same shall remain  unremedied for in excess of
          30 days  after  notice  given  by the  Agent,  at the  request  of the
          Required Banks;

                  (t) Cessation of Business.  Cessation of a substantial part of
         the  business of any  Borrower  (other  than Exsol) for a period  which
         significantly   affects  such  Borrower's   capacity  to  continue  its
         particular  business,  on a profitable  basis;  or any  Borrower  shall
         suffer  the loss or  revocation  of any  license  or permit now held or
         hereafter acquired by such Borrower which is necessary to the continued
         lawful  operation  of all  or  any  material  part  of  its  particular
         business; or any Borrower shall be enjoined,  restrained, or in any way
         prevented  by  court,   governmental,   or  administrative  order  from
         conducting  all or any material  part of its business  affairs;  or any
         Borrower  shall be required by a  Governmental  Authority  to dissolve,
         liquidate,  or wind-up its business affairs; or any lease or agreement,
         which is material  to any  Borrower's  business,  pursuant to which any
         Borrower now or hereafter leases,  uses, or occupies any property shall
         be cancelled or terminated  prior to the  expiration of its stated term
         and after  such  cancellation  or  termination,  such  Borrower  is not
         otherwise entitled to use such property;

                  (u)  Contest by  Borrower or  Affiliate.  Any  Borrower or any
         Affiliate  of any  Borrower  shall  challenge or contest in any action,
         suit, or proceeding the validity or enforceability of this Agreement or
         any of the other Credit  Documents,  the legality or  enforceability of
         any of the  Liabilities,  or the  perfection  or  priority  of any lien
         granted to Banks and Agent; and

                  (v)  Transfer  of  Stock.  Title to any of the  stock or other
         interest in any  Borrower  (other than Seitel)  (including  the Pledged
         Stock)  directly  or  indirectly  shall  be  transferred,  pledged,  or
         otherwise encumbered (except to Banks).





                                       72

<PAGE>



                                   SECTION 10
                      POWER TO SELL OR COLLECT COLLATERAL;
                              RIGHTS AND REMEDIES

                10.1  Acceleration.  Upon the occurrence of an Event of Default,
Agent, with the approval of the Required Banks,  immediately and without notice,
may, at its option,  declare that (a) all liabilities shall automatically become
immediately due and payable,  without presentment,  demand,  protest,  notice of
protest,  default, or dishonor,  notice of intent to accelerate maturity, notice
of  acceleration  of  maturity,  or other  notice of any kind,  except as may be
provided to the contrary  elsewhere  herein,  all of which are hereby  expressly
waived by the Borrowers;  and (b) the  Commitment  shall  immediately  cease and
terminate unless and until reinstated by the Agent, with the written approval of
the Required Banks.

                10.2   Rights  and   Remedies   With   Respect  to   Collateral.
Notwithstanding anything herein to the contrary, upon the happening of any Event
of Default,  Agent, with the approval of the Required Banks, is thereafter fully
authorized and empowered (without the necessity of any consent or authorization)
and the right is expressly  granted to Agent,  with the approval of the Required
Banks, and Borrowers  (individually  and  collectively)  hereby appoint and make
Agent (on behalf of Banks) as each Borrower's  true and lawful  attorney-in-fact
and agent for each Borrower and in each Borrower's  name,  place, and stead with
full power of substitution, in Agent's name or any Borrower's name or otherwise,
for Agent's use and benefit (for and on behalf of the Banks),  but at Borrowers'
cost and  expense,  to exercise,  without  notice,  all or any of the  following
powers at any time with  respect  to all or any of the  Collateral:  (a)  notify
Account Debtors to make and deliver payment and/or provide performance  directly
to Agent (on behalf of Banks); (b) demand, sue for, collect,  receive,  and give
acquittance  for  any and all  moneys  due or to  become  due by  virtue  of the
Collateral, and otherwise deal with Proceeds; (c) receive, take, endorse, assign
and deliver any and all checks,  notes,  drafts,  documents and other negotiable
and non-negotiable  instruments and chattel paper taken or received by Agent (on
behalf of Banks) in  connection  therewith;  (d) settle,  compromise,  compound,
prosecute,  or defend any action or proceeding with respect thereto; (e) deal in
or with the Collateral as fully and effectively as if Agent (on behalf of Banks)
were the absolute owner  thereof;  and (f) extend or alter the time or manner of
payment  or  performance  of any or all  thereof,  grant  waivers  and  make any
allowance or other adjustment with reference thereto;  provided,  however, Agent
(on behalf of Banks) shall be under no obligation or duty to exercise any of the
powers hereby  conferred  upon it and shall be without  liability for any act or
failure to act in connection with the collection of, or the  preservation of any
rights under or the  depreciation in value of, any Collateral.  Agent,  with the
approval of the Required Banks, may receive, open, and dispose of mail addressed
to any Borrower.  Borrowers  (individually and collectively)  hereby irrevocably
authorize and direct each Account Debtor, upon receipt of written



                                       73

<PAGE>



notice from Agent,  with the approval of the Required Banks, to pay or otherwise
perform or accept performance of the obligations under the Accounts to, with, or
for Agent, with the approval of the Required Banks, directly, and to continue to
do so until  otherwise  notified by Agent,  with the  approval  of the  Required
Banks.  Each such Account Debtor shall have no duty to inquire or investigate as
to whether an Event of Default  shall have  actually  occurred  or whether  this
Agreement shall have terminated, and no such person or entity shall be liable to
any  Borrower,  its  successors,  or assigns  for acting in  reliance on Agent's
notification as provided in this Section.

                10.3 Uniform  Commercial  Code Remedies.  Upon the occurrence of
any Event of Default, Agent, with the authorization of the Required Banks, shall
have, in addition to and without limiting all other rights and remedies provided
for herein and at law, the remedies of a secured party under the UCC (regardless
of whether the UCC has been enacted in the jurisdiction where rights or remedies
are asserted),  including,  without limitation,  the right to take possession of
the  Collateral,  and for that purpose Agent,  with the approval of the Required
Banks,  may,  so far as  Borrowers  (individually  and  collectively)  can  give
authority  therefor,  enter upon any  premises  on which the  Collateral  may be
situated and remove the same therefrom or take possession of same and store same
on such  premises  pending  disposition  under  the terms of this  Agreement  or
applicable  law.  Agent,  with the approval of the Required  Banks,  may require
Borrowers (individually and collectively) to assemble the Collateral and make it
available to Agent at a place designated by Agent which is reasonably convenient
to both parties (and for purposes hereof,  Banks and Agent  acknowledge that the
locations  where the  Seismic  Data is  currently  stored,  and which  have been
disclosed to Banks,  shall satisfy such assembly and  availability  requirements
except for  Seismic  Data  located in  Canada,  which must be moved to  Houston,
Texas).  Unless the Collateral is perishable or threatens to decline speedily in
value or is of a type  customarily  sold on a recognized  market,  Agent, at the
request of the Required  Banks,  shall give to Borrowers at least five (5) days'
written  notice of the time and place of any public sale of Collateral or of the
time after which any private  sale or any other  intended  disposition  is to be
made.  Agent,  with the approval of the Required Banks,  may, at any time in its
sole  discretion,   transfer  any  securities  or  other  property  constituting
Collateral  into its own name or that of its  nominee,  and  receive  the income
thereon  and  hold  the  same as  security  for the  Liabilities  or apply it on
principal or interest due on the Liabilities.

                10.4 Proceeds.  Subject to the terms hereof, after the happening
of any Event of Default, the proceeds of any sale of the Collateral and all sums
received  or  collected  by Agent (on behalf of Banks) from or on account of the
Collateral  shall be applied by Banks in the manner set forth in ss.9.504 of the
UCC.




                                       74

<PAGE>



                10.5  Deficiency.  Subject to the terms hereof,  Borrowers shall
remain,  jointly and severally,  liable to Banks for any unpaid  Liabilities (to
the extent owing by each such Borrower),  advances, costs, charges, and expenses
incurred by Banks in connection  herewith,  together with interest thereon,  and
shall pay the same  immediately  to Agent (on behalf of Banks) at the  Principal
Office.

                10.6 Agent's  Duties.  The powers  conferred  upon Agent by this
Agreement are solely to protect Banks' interest in the Collateral, and shall not
impose any duty upon Agent to exercise any such powers.  Agent shall be under no
duty whatsoever to make or give any presentment,  demand for performance, notice
of nonperformance,  protest,  notice of protest,  notice of dishonor,  notice of
intent to  accelerate,  notice  of  acceleration,  or other  notice or demand in
connection  with any  Collateral  or the  Liabilities,  except  as  specifically
provided in this  Agreement,  or to take any steps  necessary  to  preserve  any
rights  against  prior  parties.  Neither  Banks nor Agent  shall be liable  for
failure to collect or realize upon any or all of the Accounts or the Collateral,
or for any delay in so doing, nor shall Banks or Agent be under any duty to take
any action  whatsoever with regard  thereto.  Agent shall use reasonable care in
the custody and  preservation  of any  Collateral in its possession but need not
take any  steps to keep the  Collateral  identifiable.  Neither  Banks nor Agent
shall  have any  duty to  comply  with any  recording,  filing,  or other  legal
requirements  necessary  to  establish  or maintain  the  validity,  priority or
enforceability of, or Banks' rights in, any of the Collateral.

                10.7 Non-Judicial  Remedies.  To the fullest extent permitted by
law, Agent,  with the approval of the Required Banks, may enforce its rights and
the  rights of Banks  hereunder  without  prior  judicial  process  or  judicial
hearing,  and  Borrowers   (individually  and  collectively)   expressly  waive,
renounce,  and  knowingly  relinquish  any  and all  legal  rights  which  might
otherwise require Agent, with the approval of the Required Banks, to enforce its
rights by judicial process. In so providing for non-judicial remedies, Borrowers
(individually and collectively) recognize that such remedies are consistent with
the usage of the trade,  are  responsive  to commercial  necessity,  and are the
result of bargain at arm's length.  Nothing  herein is intended to prevent Agent
or Banks from resorting to judicial process at its or their option.

                10.8  Remedies  Not  Exclusive.   No  right,  power,  or  remedy
conferred in this Agreement,  the Notes,  any other Credit Document or any other
agreement executed in connection  herewith or any other document or agreement to
which Borrowers and Banks are parties,  or now or hereafter  existing at law, in
equity, or admiralty, by statute or otherwise, shall be exclusive, and each such
right,  power,  or  remedy,  shall,  to the full  extent  permitted  by law,  be
cumulative and in addition to every other such right, power, or remedy.




                                       75

<PAGE>



                10.9 Successive  Sales. The sale by Agent,  with the approval of
the Required Banks, of less than the whole of the Collateral (including, without
limitation,  the collection of certain Accounts) shall not exhaust the rights of
Agent and Banks hereunder,  and Agent,  with the approval of the Required Banks,
is  specifically  empowered  to make  successive  sales and  notices  to Account
Debtors hereunder until the whole of the Collateral shall be sold and collected.
If the  proceeds of any sale of less than the whole of the  Collateral  shall be
less than the  aggregate  of  Borrowers'  Liabilities,  this  Agreement  and the
security  interests  created  hereby shall remain in full force and effect as to
the  unsold  portion  of the  Collateral  just as though no sale had been  made,
provided, however, that no Borrower shall have any right to require sale of less
than the whole of the Collateral,  but Agent,  with the approval of the Required
Banks,  shall have the right, at its sole election,  to sell less than the whole
of the Collateral.

                 10.10 Enforcement  Against Particular  Collateral.  Agent, with
the approval of the  Required  Banks,  may resort to any security  given by this
Agreement or to any other security now existing or hereafter given to secure the
payment of Borrowers' Liabilities, in whole or in part, and in such portions and
in such order as may seem best to Banks in their sole  discretion,  and any such
action  shall not in any way be  considered  as a waiver  of any of the  rights,
benefits, or security interests evidenced by this Agreement.

                10.11 Suit Against  Borrowers.  Agent,  with the approval of the
Required Banks, may, at all times, proceed directly against Borrowers (or any of
them) to enforce payment of Borrowers'  Liabilities (to the extent owing by each
Borrower)  and  shall  not be  required  first  to  enforce  its  rights  in the
Collateral  or any other  security  granted to it.  Banks and Agent shall not be
required to take any action of any kind to preserve,  collect, or protect any of
their or Borrowers'  rights in the Collateral or any other  security  granted to
it.


                                   SECTION 11
                        EXPENSES: PROCEEDS OF COLLATERAL

                11.1 Collection  Costs.  Without limiting any other provision of
this Agreement,  Borrowers,  jointly and severally, shall pay to Banks and Agent
on demand  any and all  expenses  and costs of  collection,  including,  without
limitation,  counsel fees,  incurred or paid by Banks and Agent in protecting or
enforcing  its right  upon or with  respect  to any of the  Liabilities  (to the
extent such Borrower is obligated  therefor) or the Collateral.  After deducting
all of said  expenses,  the  residue of any  proceeds of  collection  or sale of
Liabilities  or  Collateral  shall be applied to the  payment  of  principal  or
interest on Liabilities in such order or preference as Banks may determine,  but
subject to the terms of Section , proper  allowance for interest on all affected
Liabilities not then due being made, and any excess shall be



                                       76

<PAGE>



returned to Borrowers and Borrowers  (jointly and severally) shall remain liable
for any deficiency.


                                   SECTION 12
                                   THE AGENT

                12.1  Appointment.  Each Bank hereby designates and appoints the
Agent as the agent of such  Bank  under  this  Agreement  and the  other  Credit
Documents,  and each Bank  authorizes the Agent,  as the agent for such Bank, to
take such action on behalf of such Bank under the  provisions of this  Agreement
and the other  Credit  Documents  and to exercise  such powers and perform  such
duties as are  expressly  delegated to the Agent by the terms of this  Agreement
and  the  other  Credit  Documents,  together  with  such  other  powers  as are
reasonably  incidental  thereto.  Notwithstanding  any provision to the contrary
elsewhere in this Agreement or in any other Credit Document, the Agent shall not
have any duties or  responsibilities  except those expressly set forth herein or
in any other Credit Document or any fiduciary relationship with any Bank; and no
implied  covenants,   functions,   responsibilities,   duties,   obligations  or
liabilities  on the part of the Agent shall be read into this  Agreement  or any
other Credit Document or otherwise exist against the Agent.

                12.2  Delegation  of Duties.  The Agent may  execute  any of its
duties under this Agreement and the other Credit  Documents by or through agents
or  attorneys-in-fact  and shall be entitled to advice of counsel concerning all
matters  pertaining to such duties.  The Agent shall not be responsible  for the
negligence or misconduct of any agents or attorneys-in-fact  selected by it with
reasonable care.

                12.3  Exculpatory  Provisions.  Neither the Agent nor any of its
officers, directors, employees, agents, attorneys-in-fact or affiliates shall be
(a) required to initiate or conduct any litiga- tion or  collection  proceedings
hereunder, except with the concurrence of the Required Banks and contribution by
each Bank of its Commitment Percentage of costs reasonably expected by the Agent
to be incurred in connection therewith, (b) liable for any action lawfully taken
or omitted to be taken by it or such  Person  under or in  connection  with this
Agreement or any other Credit Document  (except for gross  negligence or willful
misconduct of the Agent or such Person), or (c) responsible in any manner to any
Bank for any recitals,  statements,  representations  or warranties  made by the
Borrowers or any officer of any of them contained in this Agreement or any other
Credit  Document or in any  certificate,  report,  statement  or other  document
referred to or provided for in, or received by the Agent under or in  connection
with, this Agreement or any other Credit Document,  or for the value,  validity,
effectiveness,  genuineness,  enforceability or sufficiency of this Agreement or
any other Credit  Document or for any failure of the  Borrowers to perform their
obligations hereunder or thereunder. The Agent shall not be under any obligation
to any Bank to



                                       77

<PAGE>



ascertain  or to  inquire  as to the  observance  or  performance  of any of the
agreements  contained in, or conditions  of, this  Agreement or any other Credit
Document, or to inspect the properties, books or records of any Borrower.

                12.4 Reliance by Agent. The Agent shall be entitled to rely, and
shall be fully  protected  in  relying,  upon the Bank One Note and the  Compass
Note, writing,  resolution,  notice, consent,  certificate,  affidavit,  letter,
cablegram,  telegram,  telecopy, telex or teletype message,  statement, order or
other document or  conversation  believed by it to be genuine and correct and to
have been signed,  sent or made by the proper  Person or Persons and upon advice
and statements of legal counsel (including,  without limitation,  counsel to the
Borrowers), independent accountants and other experts selected by the Agent. The
Agent may deem and treat the payee of the Bank One Note and the Compass  Note as
the  owner  thereof  for all  purposes  unless  and  until a  written  notice of
assignment,  negotiation  or transfer  thereof  shall have been  received by the
Agent.  The Agent  shall be fully  justified  in failing or refusing to take any
action under this Agreement or any other Credit  Document  unless it shall first
receive such advice or concurrence of the Required Banks as it deems appropriate
and  contribution by each Bank of its Commitment  Percentage of costs reasonably
expected by the Agent to be incurred in connection therewith. The Agent shall in
all cases be fully protected in acting, or in refraining from acting, under this
Agreement  and the other Credit  Documents in  accordance  with a request of the
Required  Banks.  Such  request and any action  taken or failure to act pursuant
thereto  shall be binding upon the Banks and all future  holders of the Bank One
Note and the Compass Note.

                12.5  Notice of  Default.  The Agent shall not be deemed to have
knowledge or notice of the  occurrence of any Default or Event of Default unless
the Agent has  received  notice from a Bank or any  Borrower,  referring to this
Agreement,  describing  such  Default or Event of Default and stating  that such
notice is a "notice of  default."  In the event that the Agent  receives  such a
notice,  the Agent shall give notice thereof to the Banks.  The Agent shall take
such  action  with  respect  to such  Default  or Event of  Default  as shall be
reasonably  directed by the Required  Banks;  provided that unless and until the
Agent shall have received such directions,  subject to the provisions of Section
12.3, the Agent may (but shall not be obligated to) take such action, or refrain
from taking such action,  with respect to such Default or Event of Default as it
shall deem advisable in the best  interests of the Banks.  In the event that the
officer of the Agent  primarily  responsible for the lending  relationship  with
Borrowers  or the  officer of any Bank  primarily  responsible  for the  lending
relationship  with Borrowers becomes aware that a Default or an Event of Default
has  occurred  and is  continuing,  the Agent or such Bank,  as the case may be,
shall use its good faith efforts to inform the other Banks and/or the Agent,  as
the case may be, of such  occurrence.  Notwithstanding  the preceding  sentence,
failure to



                                       78

<PAGE>



comply with the  preceding  sentence  shall not result in any  liability  to the
Agent or any Bank.

                12.6  Non-Reliance on Agent and Other Banks. Each Bank expressly
acknowledges  that  neither  the  Agent  nor any  other  Bank  nor any of  their
respective  officers,   directors,   employees,  agents,   attorneys-in-fact  or
affiliates has made any  representation or warranty to such Bank and that no act
by the Agent or any other  Bank  hereafter  taken,  including  any review of the
affairs of the Borrowers  shall be deemed to constitute  any  representation  or
warranty by the Agent or any Bank to any other Bank. Each Bank represents to the
Agent that it has,  independently  and  without  reliance  upon the Agent or any
other  Bank,  and based on such  docu-  ments and  information  as it has deemed
appropriate,  made its own  appraisal of and  investigation  into the  business,
operations,  property,  condition (financial and otherwise) and creditworthiness
of the Borrowers  and the value of the  Collateral  and other  Properties of the
Borrowers and has made its own decision to enter into this Agreement.  Each Bank
also  represents  that it will,  inde-  pendently and without  reliance upon the
Agent or any other Bank and based on such documents and  information as it shall
deem  appropri-ate  at the  time,  continue  to make  its own  credit  analysis,
apprais-als  and decisions in taking or not taking action under this  Agree-ment
and the  other  Credit  Documents,  and to make such  investigation  as it deems
necessary to inform itself as to the business, opera-tions,  property, condition
(financial and otherwise) and  credit-worthiness  of the Borrowers and the value
of the  Collateral and other  Properties of the  Borrowers.  Except for notices,
reports and other documents  expressly  required to be furnished to the Banks by
the Agent  hereunder,  the Agent  shall not have any duty or  responsibility  to
provide any Bank with any credit or other  information  concerning the business,
operations,  property,  condi-tion (financial and otherwise) or creditworthiness
of the  Borrowers  or the value of the  Collateral  or other  Properties  of the
Borrowers  which  may  come  into  the  possession  of the  Agent  or any of its
officers, directors, employees, agents, attorneys-in-fact or affiliates.

                 12.7  INDEMNIFICATION.  EACH BANK AGREES TO INDEMNIFY THE AGENT
AND ITS OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, ATTORNEYS-IN-FACT AND AFFILIATES
(TO THE  EXTENT  NOT  REIMBURSED  BY THE  BORROWERS  AND  WITHOUT  LIMITING  THE
OBLIGATION  OF THE  BORROWERS TO DO SO),  RATABLY  ACCORDING  TO THE  COMMITMENT
PERCENTAGE  OF SUCH BANK,  FROM AND  AGAINST  ANY AND ALL  LIABILITIES,  CLAIMS,
OBLIGATIONS,  LOSSES,  DAMAGES,  PENALTIES,  ACTIONS,  JUDGMENTS,  SUITS, COSTS,
EXPENSES  AND  DISBURSEMENTS  OF ANY  KIND  WHATSOEVER  WHICH  MAY  AT ANY  TIME
(INCLUDING,  WITHOUT LIMITATION,  ANY TIME FOLLOWING THE PAYMENT AND PERFORMANCE
OF ALL  LIABILITIES  AND THE  TERMINATION  OF THIS  AGREEMENT)  BE  IMPOSED  ON,
INCURRED BY OR ASSERTED  AGAINST  THE AGENT OR ANY OF ITS  OFFICERS,  DIRECTORS,
EMPLOYEES,  AGENTS,  ATTORNEYS-IN-FACT  OR  AFFILIATES IN ANY WAY RELATING TO OR
ARISING  OUT OF THIS  AGREEMENT  OR ANY  OTHER  CREDIT  DOCUMENT,  OR ANY  OTHER
DOCUMENT  CONTEMPLATED  OR REFERRED TO HEREIN OR THE  TRANSACTIONS  CONTEMPLATED
HEREBY OR ANY ACTION TAKEN OR OMITTED BY THE AGENT OR ANY OF ITS OFFICERS,



                                       79

<PAGE>



                 DIRECTORS,  EMPLOYEES, AGENTS,  ATTORNEYS-IN-FACT OR AFFILIATES
UNDER OR IN CONNECTION WITH ANY OF THE FOREGOING, INCLUDING, WITHOUT LIMITATION,
ANY LIABILITIES,  CLAIMS,  OBLIGATIONS,  LOSSES,  DAMAGES,  PENALTIES,  ACTIONS,
JUDGMENTS,  SUITS,  COSTS,  EXPENSES  AND  DISBURSEMENTS  IMPOSED,  INCURRED  OR
ASSERTED AS A RESULT OF THE NEGLIGENCE, WHETHER SOLE OR CONCURRENT, OF THE AGENT
OR ANY OF ITS  OFFICERS,  DIRECTORS,  EMPLOYEES,  AGENTS,  ATTORNEYS-IN-FACT  OR
AFFILIATES; PROVIDED THAT NO BANK SHALL BE LIABLE FOR THE PAYMENT OF ANY PORTION
OF  SUCH  LIABILITIES,   OBLIGATIONS,   LOSSES,  DAMAGES,  PENALTIES,   ACTIONS,
JUDGMENTS,  SUITS,  COSTS,  EXPENSES OR DISBURSEMENTS  RESULTING SOLELY FROM THE
GROSS  NEGLIGENCE  OR WILLFUL  MISCONDUCT  OF THE AGENT OR ANY OF ITS  OFFICERS,
DIRECTORS, EMPLOYEES, AGENTS, ATTORNEYS-IN-FACT OR AFFILIATES. THE AGREEMENTS IN
THIS SECTION SHALL SURVIVE THE PAYMENT AND  PERFORMANCE OF ALL  LIABILITIES  AND
THE TERMINATION OF THIS AGREEMENT.

                12.8  Primary  and   Secondary   Collateral.   It  is  expressly
understood  and  agreed  that  notwithstanding  any  past,  existing,  or future
agreements  between  Compass Bank (or any of its affiliates,  including  Compass
Alabama) and one or more of Borrowers and/or between Bank One and one or more of
Borrowers,  (a) the "Primary  Collateral" (meaning all Collateral other than the
Secondary  Collateral,  as  defined  below and  herein  used,  but  specifically
including  all  deposits  and other  accounts  of  Borrowers,  individually  and
collectively,  now or  hereafter  located at any Bank),  shall  secure first the
payment  and  performance  of  the  Revolving  Line  (including  all  principal,
interest,  related  costs and  expenses)  and the  Proceeds of all such  Primary
Collateral  and any  realization  thereupon  shall be  applied  (i) first to the
Revolving  Line  (including  all  principal,  interest,  and  related  costs and
expenses)  on a pro rata basis until the same is paid in full,  (ii) then to the
Geophysical Loan whether in satisfaction of  Geophysical's  obligation under the
Geophysical  Note or in  satisfaction  of Seitel's  obligation  under the Seitel
Geophysical Guaranty (including all principal,  interest,  and related costs and
expenses) until paid in full, and (iii) then to any and all other Liabilities on
a pro rata basis,  and (b) the  "Secondary  Collateral"  (meaning  Geophysical's
Equipment in which Compass Alabama has a security interest under the Geophysical
Documents,  other than Equipment constituting Seismic Data, if any) shall secure
first the payment and  performance of the Geophysical  Loan by Compass  Alabama,
and accordingly, such Secondary Collateral and any collection and/or realization
thereupon  shall  be  applied  first to the  Geophysical  Loan  (including,  all
principal, interest, fees, related costs, and expenses) until paid in full, next
to the  Liabilities  owing to each Bank under the Revolving Line  (including all
principal,  interest,  and related costs and expenses) on a pro rata basis until
paid in full, and then to any of the other  Liabilities  owing to either or both
Banks until paid in full.

                 12.9 Restitution.  Should the right of the Agent or any Bank to
realize funds with respect to the  Liabilities be challenged and any application
of such funds to the Liabilities be reversed,  whether by Governmental Authority
or otherwise, or should the



                                       80

<PAGE>



Borrowers  otherwise be entitled to a refund or return of funds  distributed  to
the Banks in  connection  with the  Liabilities,  the Agent or such Bank, as the
case may be, shall promptly  notify the Banks of such fact. Not later than Noon,
Central  Standard or Daylight  Savings Time, as the case may be, of the Business
Day following  such notice,  each Bank shall pay to the Agent an amount equal to
the  ratable  share of such Bank of the funds  required  to be  returned  to the
Borrower. The ratable share of each Bank shall be determined on the basis of the
percentage  of the  payment all or a portion of which is required to be refunded
which  was  originally  distributed  to such  Bank,  if such  percentage  can be
determined,  or, if such  percentage  cannot be determined,  on the basis of the
Commitment  Percentage  of such Bank.  The Agent shall forward such funds to the
Borrowers or to the Banks required to return such funds.  If any such amount due
to the Agent is made  available  by any Bank after  Noon,  Central  Standard  or
Daylight  Savings Time,  as the case may be, of the Business Day following  such
notice,  such Bank shall pay to the Agent (or the Bank  required to return funds
to the Borrower, as the case may be) for its own account interest on such amount
at a rate equal to the Federal  Funds Rate for the period from and including the
date on which  restitution  to the  Borrowers  is made by the Agent (or the Bank
required  to  return  funds  to the  Borrowers,  as the  case may be) to but not
including  the date on which such Bank  failing to timely  forward  its share of
funds required to be returned to the Borrowers shall have made its ratable share
of such funds available.

                12.10  Agent  in Its  Individual  Capacity.  The  Agent  and its
affiliates may make loans to, accept  deposits from and generally  engage in any
kind of  business  with the  Borrowers  as though  the Agent  were not the agent
hereunder. With respect to any note issued to the Bank serving as the Agent, the
Agent shall have the same rights and powers  under this  Agreement as a Bank and
may exercise  such rights and powers as though it were not the Agent.  The terms
"Bank" and "Banks" shall include the Agent in its individual capacity.

                12.11  Successor  Agent.  The Agent may resign as Agent upon ten
days' notice to the Banks and the Borrowers.  If the Agent shall resign as Agent
under  this  Agreement  and the  other  Credit  Documents,  Banks  for which the
Commitment  Percentages  aggregate  at least 100% shall  appoint  from among the
Banks a successor  agent for the Banks,  whereupon  such  successor  agent shall
succeed to the rights,  powers and duties of the Agent.  The term "Agent"  shall
mean such successor agent effective upon its appointment. The rights, powers and
duties of the former  Agent as Agent shall be  terminated,  without any other or
further  act or deed on the part of such  former  Agent or any of the parties to
this  Agreement or any holders of the Bank One Note and the Compass Note.  After
the removal or  resignation of any Agent  hereunder as Agent,  the provisions of
this  Article 12 and  Sections  7.1(m),  (n),  (o),  and (p) shall  inure to its
benefit as to any actions  taken or omitted to be taken by it while it was Agent
under this Agreement and the other Credit Documents.



                                       81

<PAGE>




                 12.12  Applicable  Parties.  The provisions of this Article are
solely for the benefit of the Agent and the Banks,  and no  Borrower  shall have
any rights as a third party beneficiary or otherwise under any of the provisions
of this Article . In per- forming  functions and duties  hereunder and under the
other  Credit  Documents,  Agent  shall act solely as the agent of the Banks and
does not assume,  nor shall it be deemed to have  assumed,  any obli-  gation or
relationship  of  trust  or  agency  with  or for  any  Borrower  or  any  legal
representative, successor and assign of any Borrower.


                                   SECTION 13
                                    GENERAL

                13.1  Waivers.  Without  limiting any other term or provision of
this Agreement, Borrowers (individually and collectively),  accommodation party,
surety, endorser, or other person or entity liable for the payment or collection
of the Liabilities  expressly waive demand,  presentment for payment,  notice of
protest,  notice of  intent to  accelerate,  notice of  acceleration,  notice of
acceptance  of this  Agreement,  and  notice  of loans  made,  credit  extended,
Collateral  received or delivered,  or other action taken in reliance hereon and
all other  demands  and notices of any  description.  With  respect  both to the
Liabilities and Collateral,  Borrowers (individually and collectively) assent to
any extension or postponement of the time of payment or any other indulgence, to
any substitution,  exchange, or release of any or all of the Collateral,  to the
addition or release of any party or person primarily or secondarily  liable,  to
the acceptance of partial payments thereon and the settlement,  compromising, or
adjusting of any thereof,  all in such manner and at such time or times as Banks
may deem advisable. Banks shall not be deemed to have waived any of their rights
upon or under any of the  Liabilities  or  Collateral  unless  such waiver be in
writing  and  signed by Banks and Agent.  No course of  dealing  and no delay or
omission on the part of Banks in exercising  any right shall operate as a waiver
of such right or any other  right.  A waiver on any one occasion by Banks of any
of their  rights  hereunder  shall not be construed as a bar to or waiver of any
right on any further occasion.

                13.2  Replacement of Prior Loan  Agreement.  Borrowers and Banks
agree and  acknowledge  that this  Agreement  shall restate,  modify,  and fully
replace the Prior Loan Agreement and that, as of the Closing Date, the terms and
provisions of this  Agreement  shall govern and control the  relationship  among
Agent,  Borrowers and Banks  (notwithstanding  anything to the contrary  herein,
prior to, but not  including,  the Closing Date, the terms and provisions of the
Prior Loan Agreement shall govern,  except that any facts or circumstances  that
would have  constituted a breach of any of the covenants or conditions under the
Prior Loan  Agreement  from and after the  Effective  Date and up to the Closing
Date,  but that  would  not  constitute  a breach  of any of the  covenants  and
conditions under this Agreement,  shall be deemed waived by Banks),  except that
Borrowers agree that the representations and warranties made by



                                       82

<PAGE>



certain of the Borrowers in the Prior Loan Agreement were true and correct as of
the date of the Prior Loan Agreement.  Further,  Borrowers agree and acknowledge
that Compass Alabama has sold its right, title, and interest in and to the loans
described  in the  Prior  Loan  Agreement  to  Compass,  and that in  connection
therewith,  as of the Closing Date,  Compass has, among other things,  succeeded
Compass Alabama as Agent.

                13.3 Lien Continuation. The liens and security interests granted
in the  Prior  Security  Agreements  and the Prior  Loan  Agreement  are  hereby
renewed,  extended,  ratified, and confirmed as continuing to secure the payment
of the indebtedness  currently evidenced by the Notes,  together with all of the
other  Liabilities.  Without limiting the foregoing,  each of the Prior Security
Agreements  is hereby  amended to (a) replace all  references  herein to Compass
Alabama with a reference to Compass  (Compass having inured to all of the rights
and obligations of Compass Alabama under each of the Prior Security Agreements),
(b) provide that each of the Prior Security  Agreements is and shall be governed
by the laws of the State of Texas,  (c) to specifically  secure the payments and
performance  of the  Notes  and  other  Liabilities,  and  (d) to  otherwise  be
consistent with the terms and provisions of this Agreement. Nothing herein shall
in any manner diminish,  impair, or extinguish any of the indebtedness evidenced
by the Notes or any of the liens and security interests  heretofore or hereafter
securing  such  indebtedness.  There are no defenses,  offsets,  or other claims
available  to any  Borrower  with  respect  to the Notes,  and the  indebtedness
evidenced thereby, and the other Liabilities.

                13.4 Notices.  Any demand upon or notice to Borrowers that Banks
or Agent may elect to give shall be  effective  upon  delivery if such notice is
given  personally,  or upon  dispatch if  deposited  in the mails  addressed  to
Seitel,  on  behalf  of all  Borrowers,  at the  mailing  address  shown  at the
beginning of this Agreement or, if any Borrower has notified Banks in writing of
a change of address,  to such  Borrower's  last address so notified.  Demands or
notices  addressed to Seitel's address at which Agent  customarily  communicates
with Seitel also shall be effective. Without limiting the foregoing, all notices
or other communications required or permitted under this Agreement also shall be
deemed to have been given (a) on the date of service if served personally on the
party to whom notice is to be given,  (b) on the day of  transmission if sent by
confirmed  facsimile  transmission,  (c) on the day after  delivery  to  Federal
Express or similar overnight  courier,  properly  addressed for prepaid delivery
the next day,  or (d) on the day after  mailing,  if mailed to the party to whom
notice is to be given,  by first class mail,  registered or  certified,  postage
prepaid, and properly addressed, return receipt requested, to such party.

                 13.5 Transfers and  Participations.  Any Bank may, at any time,
sell,  transfer or assign the  Liabilities or any portion thereof to one or more
commercial  banks who is reasonably  acceptable to Borrowers (to the extent such
Borrower is obligated


                                       83

<PAGE>



on the  applicable  Liability).  Such  Bank and the Agent  may  forward  to each
transferee  and  prospective  transferee of all or any portion of or interest in
the  Liabilities,  all documents and  information  relating to the  Liabilities,
whether  furnished by any Borrower or  otherwise  obtained,  as such Bank or the
Agent  determines  necessary or desirable.  Each Borrower  agrees that each such
permitted  assignee  shall be a "Bank" under this Agreement and may exercise all
rights (including,  without  limitation,  rights of set-off) with respect to the
portion of the  Liabilities  held by it, subject to any agreements  between such
transferee and the transferor to such transferee. Notwithstanding the foregoing,
no such  participation  or  assignment  shall  increase or expand the  liability
(other than  increases in the  Borrowing  Base) of any Borrower  hereunder  (and
Banks  specifically  acknowledge that no Borrower shall be liable for any of the
fees and  expenses  incurred by the Banks or the Agent in  connection  with such
transfers and participations  unless the transfer is requested by any Borrower),
and Borrowers may deal solely with the Agent for purposes of providing  notices,
reports and payments  hereunder.  Notwithstanding  anything in this Agreement to
the  contrary,  no Bank  other  than  Bank One or  Compass  shall  be the  Agent
hereunder without the prior written consent of the Borrower.

                 13.6 GOVERNING LAW. THIS AGREEMENT AND THE CREDIT DOCUMENTS AND
ALL  RIGHTS AND  OBLIGATIONS  HEREUNDER  AND  THEREUNDER,  INCLUDING  MATTERS OF
CONSTRUCTION,  VALIDITY,  AND PERFORMANCE,  SHALL BE GOVERNED BY THE LAWS OF THE
STATE OF TEXAS,  EXCEPT THAT TEX.  REV.  CIV.  STAT.  ANN.  ART.  5069-1.04,  AS
AMENDED,  CH. 15, WHICH  REGULATES  CERTAIN  REVOLVING  CREDIT LOAN ACCOUNTS AND
REVOLVING TRI-PARTY ACCOUNTS,  SHALL NOT APPLY TO THIS AGREEMENT, THE NOTES, THE
REVOLVING LINE, OR ANY TRANSACTION CONTEMPLATED HEREBY.

                13.7  Entire  Agreement.   This  Agreement,   the  other  Credit
Documents,  and the  documents  delivered  hereunder or in  connection  herewith
contain the entire  agreement  between the parties  with  respect to the subject
matter  hereof  and  thereof  and,  without  limiting  any other  terms  hereof,
supersede  all prior  agreements  relating  to the  subject  matter  hereof  and
thereof.  In the event of actual  conflict in the terms and  provisions  of this
Agreement and any other Credit Document (including any Prior Security Agreement)
or any of such other documents or any other instrument or agreement  executed in
connection  with this  Agreement or described or referred to in this  Agreement,
the terms and  provisions of this  Agreement  shall  control.  No  modification,
consent,  amendment,  or waiver of any provision of this  Agreement or any other
Credit Document,  nor consent to any departure by any Borrower therefrom,  shall
be effective  unless the same shall be in writing and signed by Banks,  and then
shall be effective  only in the specific  instance and for the purpose for which
given.  This Agreement is binding upon Borrowers,  their successors and assigns,
and  inures  to  the  benefit  of  Banks,  their  successors  and  assigns.  All
representations  and  warranties  of  Borrowers  herein or in any  other  Credit
Document,  and all covenants and agreements herein, in any other Credit Document
or in any document delivered hereunder or in connection herewith



                                       84

<PAGE>



that are not fully  performed  before the effective date of this Agreement shall
survive such date.  THIS AGREEMENT  REPRESENTS THE FINAL  AGREEMENT  BETWEEN THE
PARTIES AND MAY NOT BE  CONTRADICTED BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS,  OR
SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.  THERE ARE NO ORAL AGREEMENTS BETWEEN
THE PARTIES.

                13.8 Construction and Severability. This Agreement and the other
Credit  Documents  shall be liberally  construed in favor of Banks and Agent. In
the  event  any  one or  more  of the  terms  or  provisions  contained  in this
Agreement,  in any other Credit Document or in any other instrument or agreement
referred  to  herein or  executed  in  connection  with or as  security  for the
Liabilities, or any application thereof to any person or circumstances, shall be
declared  prohibited,  illegal,  invalid or  unenforceable  to any extent in any
jurisdiction,  as determined by a court of competent jurisdiction,  such term or
provision, in that jurisdiction, shall be ineffective only to the extent of such
prohibition,  illegality, invalidity or unenforceability,  or as applied to such
persons or circumstances,  without  invalidating or rendering  unenforceable the
remaining  terms or  provisions  hereof or thereof or affecting  the validity or
enforceability  of such term or  provision  in any other  jurisdiction  or as to
other persons or circumstances in such jurisdiction,  unless such would effect a
substantial deviation from the general intent and purpose of the parties, make a
significant  change  in the  economic  effect of the  transactions  contemplated
herein on any Bank,  or impair the  validity,  perfection  or priority of Banks'
security  interest in any  Collateral  or the  validity of any guaranty or other
security for the  Liabilities,  in which event a substitute  provision  shall be
supplied by the court in order to provide  Banks with the  benefits  intended by
such invalid term or provision.

                13.9 Other  Advances.  Subject  to Section  8.1(m) and all other
relevant provisions of this Agreement, Borrowers and Banks acknowledge and agree
that in the future, Borrowers (or any of them) may apply for and Banks may agree
to fund  additional  loans to Borrowers  (or any of them).  Borrowers  and Banks
agree that all existing and  hereafter  created  loans and other  advances  from
Banks, or any of its  predecessors  or successors in interest,  to Borrowers (or
any of them),  whether  or not such  loans are  particularly  described  in this
Agreement, as may be amended from time to time, shall constitute Liabilities for
purposes  of this  Agreement  and shall be  subject  to the  terms,  provisions,
covenants, and agreements set forth in this Agreement.

                13.10 No Duty or Special Relationship.  Borrowers  (individually
and  collectively)  acknowledge  that Banks and Agent have no duty to  Borrowers
with  respect to the loan  transactions  set forth in this  Agreement  except as
expressly  provided for in this  Agreement and the other Credit  Documents,  and
acknowledge that no fiduciary, trust, or other special relationship exists among
Banks, Agent, and Borrowers.




                                       85

<PAGE>



                13.11  NO  CONTROL  BY  BANKS.   BORROWERS   (INDIVIDUALLY   AND
COLLECTIVELY)  AGREE AND  ACKNOWLEDGE  THAT ALL OF THE COVENANTS AND  AGREEMENTS
PROVIDED  FOR AND MADE BY BORROWERS  IN THIS  AGREEMENT  AND IN THE OTHER CREDIT
DOCUMENTS  ARE THE RESULT OF  EXTENSIVE  AND ARMS- LENGTH  NEGOTIATIONS  BETWEEN
BORROWERS AND BANKS.  BANKS' RIGHTS AND REMEDIES  PROVIDED FOR IN THIS AGREEMENT
AND IN THE OTHER CREDIT  DOCUMENTS ARE INTENDED TO PROVIDE BANKS WITH A RIGHT TO
OVERSEE  EACH  BORROWER'S  ACTIVITIES  AS THEY  RELATE TO THE LOAN  TRANSACTIONS
PROVIDED FOR IN THIS  AGREEMENT,  WHICH RIGHT IS BASED ON BANKS' VESTED INTEREST
IN BORROWERS' ABILITY TO PAY THE NOTES AND PERFORM THE OTHER  LIABILITIES.  NONE
OF THE COVENANTS OR OTHER PROVISIONS CONTAINED IN THIS AGREEMENT SHALL, OR SHALL
BE DEEMED  TO,  GIVE  BANKS  THE RIGHT OR POWER TO  EXERCISE  CONTROL  OVER,  OR
OTHERWISE  IMPAIR,  THE DAY-TO-DAY  AFFAIRS,  OPERATIONS,  AND MANAGEMENT OF ANY
BORROWER;  PROVIDED  THAT IF ANY BANK  BECOMES  THE  OWNER  OF ANY  STOCK OF ANY
ENTITY,  WHICH  ENTITY  OWNS  AN  INTEREST  IN  ANY  BORROWER,  WHETHER  THROUGH
FORECLOSURE  OR OTHERWISE,  SUCH BANK  THEREAFTER  SHALL BE ENTITLED TO EXERCISE
SUCH LEGAL RIGHTS AS IT MAY HAVE BY BEING A SHAREHOLDER OF SUCH ENTITY.

                13.12 No Partnership.  Nothing herein is intended,  nor shall it
be deemed or construed as, to create a  partnership,  joint  venture,  or common
interest in profits or income among Borrowers and Banks, or to make Banks in any
way  responsible  for the debts or losses of  Borrowers  or with  respect to the
Collateral.  Borrowers and Banks  disclaim any sharing of  liabilities,  losses,
costs  or  expenses.   Borrowers  agree  and  acknowledge  that  all  covenants,
agreements,  representations, and warranties made in this Agreement are made and
agreed to by Borrowers,  individually and  collectively,  on a joint and several
basis.

                13.13  Calculation  of  Financial   Covenants.   Notwithstanding
anything herein to the contrary, all financial covenants in this Agreement shall
be calculated by Seitel on a consolidated basis; provided,  that for purposes of
this Agreement, DDD Energy, Inc. shall not be included in the calculation of any
such financial covenants.  Further, without limiting any other term or provision
of this  Agreement,  to the  extent  Seitel or any of its  Affiliates  have made
advances to or  investments  in DDD Energy,  Inc.,  all such  advances  shall be
excluded  from  Seitel's  Consolidated  Tangible  Net Worth for purposes of this
Agreement.

                13.14  No   Restrictions   on  DDD  Energy,   Inc.  The  Parties
acknowledge that one of Seitel's  subsidiaries,  DDD Energy,  Inc., is currently
negotiating  with  Banks  for a loan  to be  secured  primarily  by oil  and gas
reserves  and to be  evidenced  by the DDD  Credit  Agreement.  The  DDD  Credit
Agreement is anticipated to contain certain covenants and conditions,  generally
similar to those contained herein,  with which DDD Energy, Inc. will be required
to comply.  Because DDD Energy, Inc.'s activities are expected to be governed by
the DDD Credit  Agreement,  the parties  acknowledge  that the activities of DDD
Energy,  Inc.  will  not be  governed  by the  terms  of this  Agreement  unless
otherwise specifically set forth herein.



                                       86

<PAGE>




                13.15 Binding Effect.  All covenants and agreements of Borrowers
under  this  Agreement  shall  bind the  respective  successors  and  assigns of
Borrowers and shall inure to the benefit of Banks,  Agent,  and their successors
and assigns. The rights of Borrowers under this Agreement are not assignable.

                13.16 Renewal of Indebtedness.  All provisions of this Agreement
relating  to the Notes  shall  apply with equal force and effect to each and all
promissory  notes  hereafter  executed  which in whole  or in part  represent  a
renewal,  extension or rearrangement of any part of the indebtedness  originally
represented by the Notes, or either of them,  provided that nothing herein shall
constitute  a  commitment  or offer by Banks  to such a  renewal,  extension  or
rearrangement.

                13.17 Banks'  Discretion.  In all matters hereunder that require
Banks'  discretion,  (including,  without  limitation,  whether  Borrowers  have
satisfied any condition  precedent),  Banks shall use their sole and  reasonable
discretion,  except as  otherwise  provided for herein.  Further,  Banks may, in
their sole  discretion,  waive any of their  rights with respect to a particular
Event of Default.

                13.18  Counterparts.  This  Agreement  may be executed in two or
more  counterparts,  and it shall not be necessary  that any one  counterpart be
executed  by all  of the  parties  hereto.  Each  fully  or  partially  executed
counterpart  shall  be  deemed  an  original,  but all such  counterparts  taken
together shall constitute but one and the same instrument.

                13.19 Business Loans. Borrowers  (individually and collectively)
warrant and represent to Banks,  and to all other holders of any debt  evidenced
by the  Notes,  that the  loans  evidenced  by the  Notes  are and  shall be for
business, commercial,  investment or other similar purpose and not primarily for
personal,  family,  household  or  agricultural  use,  as such terms are used in
Chapter One of the Texas Credit Code.

                13.20  JURISDICTION  AND VENUE.  ALL ACTIONS OR PROCEEDINGS WITH
RESPECT TO, ARISING  DIRECTLY OR INDIRECTLY IN CONNECTION  WITH, OUT OF, RELATED
TO OR FROM THIS  AGREEMENT AND THE OTHER CREDIT  DOCUMENTS MAY BE LITIGATED,  AT
THE SOLE  DISCRETION  AND ELECTION OF BANKS,  IN COURTS HAVING SITUS IN HOUSTON,
HARRIS COUNTY,  TEXAS.  BORROWERS  (INDIVIDUALLY AND COLLECTIVELY) SUBMIT TO THE
JURISDICTION OF ANY LOCAL,  STATE,  OR FEDERAL COURT LOCATED IN HOUSTON,  HARRIS
COUNTY,  TEXAS,  AND WAIVE  ANY  RIGHTS IT MAY HAVE TO  TRANSFER  OR CHANGE  THE
JURISDICTION  OR  VENUE  OF ANY  LITIGATION  BROUGHT  AGAINST  THEM BY  BANKS IN
ACCORDANCE WITH THIS SECTION.

                13.21  DECEPTIVE  TRADE  PRACTICES.  TO THE EXTENT  PERMITTED BY
APPLICABLE LAW, BORROWERS (INDIVIDUALLY AND COLLECTIVELY) HEREBY EXPRESSLY WAIVE
EACH AND EVERY OF THEIR  RIGHTS AND  REMEDIES  ARISING  UNDER OR PURSUANT TO THE
PROVISIONS  OF  SUBCHAPTER  E,  CHAPTER 17,  TITLE 2 OF THE TEXAS  BUSINESS  AND
COMMERCE  CODE (OTHER THAN THE  PROVISIONS  OF SECTION  17.555  THEREOF),  WHICH
SUBCHAPTER IS KNOWN AS



                                       87

<PAGE>



THE  "DECEPTIVE   TRADE  PRACTICES  -  CONSUMER   PROTECTION   ACT".   BORROWERS
(INDIVIDUALLY AND  COLLECTIVELY)  REPRESENT AND WARRANT THAT THEY HAVE KNOWLEDGE
AND  EXPERIENCE IN FINANCIAL  AND BUSINESS  MATTERS THAT ENABLE THEM TO EVALUATE
THE MERITS AND RISKS OF THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT AND THAT
THEY ARE NOT IN A SIGNIFICANT  DISPARATE  BARGAINING POSITION VIS A VIS ANY BANK
AT THE TIME OF ENTERING INTO THIS AGREEMENT AND THE OTHER CREDIT DOCUMENTS.

                13.22 WAIVER OF RIGHTS TO JURY TRIAL. EACH OF THE BORROWERS, THE
BANKS, AND THE AGENT HEREBY KNOWINGLY, VOLUNTARILY, INTENTIONALLY,  IRREVOCABLY,
AND  UNCONDITIONALLY  WAIVE  ALL  RIGHTS TO TRIAL BY JURY IN ANY  ACTION,  SUIT,
PROCEEDING,  COUNTERCLAIM,  OR OTHER LITIGATION THAT RELATES TO OR ARISES OUT OF
ANY OF THIS  AGREEMENT OR ANY OTHER CREDIT  DOCUMENT OR THE ACTS OR OMISSIONS OF
THE  AGENT  OR ANY OF THE  BANKS,  IN THE  ENFORCEMENT  OF ANY OF THE  TERMS  OR
PROVISIONS  OF THIS  AGREEMENT  OR ANY OTHER CREDIT  DOCUMENT OR OTHERWISE  WITH
RESPECT  THERETO.  THE PROVISIONS OF THIS SECTION ARE A MATERIAL  INDUCEMENT FOR
THE AGENT AND THE BANKS ENTERING INTO THIS AGREEMENT.

                  IN WITNESS  WHEREOF,  the parties  hereto have  executed  this
Agreement on the date first above written.


                                          BORROWERS:

                                          SEITEL, INC.


                                          By: /s/ Debra D. Valice
                                             -------------------------------
                                             Debra D. Valice, Vice President
                                             of Finance, Chief Financial
                                             Officer, Treasurer, and
                                             Secretary


                                          SEITEL DATA CORP.


                                          By: /s/ Debra D. Valice
                                             -------------------------------
                                             Debra D. Valice, Secretary and
                                             Treasurer


                                          SEITEL GEOPHYSICAL, INC.


                                          By: /s/ Debra D. Valice
                                             -------------------------------
                                             Debra D. Valice, Secretary and
                                             Treasurer





                                       88

<PAGE>



                                          SEITEL OFFSHORE CORP.


                                          By: /s/ Debra D. Valice
                                             -------------------------------
                                             Debra D. Valice, Secretary and
                                             Treasurer


                                          EXSOL, INC.


                                          By: /s/ Debra D. Valice
                                             -------------------------------
                                             Debra D. Valice, Secretary and
                                             Treasurer


                                           A BANK:

                                           BANK ONE, TEXAS, NATIONAL
                                           ASSOCIATION


                                          By: /s/ Damien Meiburger
                                             -------------------------------
                                             Damien Meiburger,
                                             Senior Vice-President



                                           AGENT AND A BANK:

                                           COMPASS BANK - HOUSTON


                                          By: /s/ Dorothy Marchand Wilson
                                             -------------------------------
                                             Dorothy Marchand Wilson,
                                             Vice-President



                                       89





                        AMENDMENT TO SECURITY AGREEMENT
                            (JOINT VENTURE INTEREST)


                  This Amendment to Security  Agreement (Joint Venture Interest)
(this  "Amendment")  is made and entered  into  effective  as of the 31st day of
December,  1994,  by and among SEITEL  OFFSHORE  CORP.,  a Delaware  corporation
("Venturer");  and BANK ONE, TEXAS,  NATIONAL  ASSOCIATION,  a national  banking
association  ("Bank  One");  and COMPASS  BANK-HOUSTON,  a Texas  state  banking
association (col- lectively with Bank One, "Lenders").

                              W I T N E S S E T H:

                  WHEREAS,  Venturer  has executed a Security  Agreement  (Joint
Venture Interest) (the "Joint Venture Pledge Agreement") dated effective May 19,
1994,  granting to Lenders a continuing security interest in and to, among other
things,  all of Venturer's  rights,  titles, and interests in, to, and under the
Joint Venture  Agreement dated March 1, 1990, of Digitel Data Joint Venture,  as
more fully described in the Joint Venture Pledge Agreement; and

                  WHEREAS,  Venturer  and  Lenders  desire to amend  and  modify
certain terms and provisions of the Joint Venture Pledge Agreement.

                  NOW,  THEREFORE,  for good  and  valuable  consideration,  the
receipt and sufficiency of which are hereby  acknowledged,  Venturer and Lenders
agree as follows:

         1.       Amendments to Joint Venture Pledge Agreement.  The Joint
Venture Pledge Agreement is modified and amended as follows:

                 1.1 The  first  grammatical  paragraph  on Page 1 of the  Joint
Venture  Pledge  Agreement  is  deleted in its  entirety  and the  following  is
substituted in place thereof:

                    THIS SECURITY AGREEMENT (JOINT VENTURE  INTEREST),  executed
          effective  as of the 19th  day of May,  1994  ("Agreement")  is by and
          among SEITEL OFFSHORE CORP., a Delaware  corporation (the "Venturer"),
          and COMPASS BANKHOUSTON, a Texas banking association ("Compass"), BANK
          ONE,  TEXAS,  NATIONAL  ASSOCIATION,  a national  banking  association
          ("Bank One",  collectively with Compass, the "Lenders"),  and Compass,
          in its  additional  capacity  as  agent  for the  benefit  of  Lenders
          ("Agent").

                 1.2 The first  grammatical  paragraph of the Preamble on Page 1
of the Joint  Venture  Pledge  Agreement  is  deleted  in its  entirety  and the
following is substituted in place thereof:

                    DIGITEL DATA JOINT  VENTURE (the "Joint  Venture")
          is a Texas  joint  venture  which was  organized  and exists
          pursuant to its Joint Venture  Agreement  effective March 1,
          1990 (the "Joint Venture Agreement"). Venturer



<PAGE>



          is  a  joint   venturer  of  the  Joint  Venture.   Venturer,   Seitel
          Geophysical,  Inc., Seitel Data Corp.,  Exsol, Inc., and Seitel,  Inc.
          (jointly and severally, the "Borrowers"), are or are becoming indebted
          to Lenders on and in connection  with a revolving  line of credit (the
          "Loan") as  evidenced by those  certain  Master  Revolving  Promissory
          Notes  dated May 4,  1995,  payable  to  Lenders  (as may be  amended,
          modified, renewed, rearranged,  replaced, and substituted from time to
          time,  the  "Notes").  The Loan is being made  available by Lenders to
          Venturer  and the other  Borrowers,  pursuant  to a  certain  Restated
          Revolving Credit and Security Agreement dated effective as of December
          31, 1994 (as may be amended and modified from time to time,  the "Loan
          Agreement"),  the  terms  of  which  are  hereby  made a part  of this
          Agreement.  The Loan is  secured  by,  among  other  things,  the Loan
          Documents  (which are defined for purposes of this  Agreement as being
          the Credit  Documents  under and as defined in the Loan Agreement) and
          all  collateral  and  security  referred  to  therein.  In  connection
          therewith, Lenders have required as additional collateral for the Loan
          a security  interest in the  Collateral  (as defined and  described in
          Section 2 below).

                 1.3  Section  5(a)  on  Page  4 of  the  Joint  Venture  Pledge
Agreement  is deleted in its  entirety and the  following  substituted  in place
thereof:

                    Agent and each of Lenders may immediately and without notice
          or demand to Venturer or any other  person or entity  exercise any and
          all of the  rights  and the  remedies  of a  secured  party  under the
          Uniform  Commercial  Code as enacted  in the State of Texas,  together
          with the rights set forth in the Notes, this Agreement,  and the other
          Loan  Documents and such other rights and remedies as are available at
          law or equity or otherwise, all of which shall be cumulative;

                 1.4 Section 10 on Page 8 of the Joint Venture Pledge  Agreement
is deleted in its entirety and the following is substituted in place thereof:

                    Any  notice   required  or  permitted   hereunder  shall  be
          conclusively  deemed to have been  received by either party hereto and
          be  effective  on the  earlier of the day on which  delivered  to such
          party at the  address  set forth  below or such other  address as such
          party shall  specify to the other  party in  writing,  or on the third
          business day after the day on which mailed (or sent) addressed to such
          party at said address:




                                       2

<PAGE>



                  If to Venturer:         Seitel Offshore Corp.
                                          50 Briar Hollow Lane
                                          7th Floor West
                                          Houston, Texas 77027

                  If to Compass/Agent:    Compass Bank-Houston
                                          24 Greenway Plaza
                                          P.O. Box 4444
                                          Houston, Texas  77210-4444
                                          Attn:  Ms. Dorothy M. Wilson

                  If to Bank One:         Bank One, Texas, N.A.
                                          910 Travis
                                          Houston, Texas 77002
                                          Attn: Mr. Damien Meiburger

                 1.5  Section  12 on  Pages 8, 9,  and 10 of the  Joint  Venture
Pledge  Agreement is deleted in its entirety and the following is substituted in
place thereof:

                    THIS AGREEMENT  SHALL BE DEEMED TO BE A CONTRACT MADE UNDER,
          AND  FOR  ALL  PURPOSES  SHALL  BE  GOVERNED  BY AND BE  CONSTRUED  IN
          ACCORDANCE  WITH,  THE LAWS AND  JUDICIAL  DECISIONS  OF THE  STATE OF
          TEXAS.  THIS AGREEMENT IS BEING EXECUTED UNDER THE SEAL OF THE PARTIES
          HERETO,  AND IT IS INTENDED THAT THIS AGREEMENT IS, AND SHALL HAVE THE
          EFFECT OF, A SEALED INSTRUMENT UNDER LAW.  VENTURER  ACKNOWLEDGED THAT
          THE  NEGOTIATION OF THE PROVISIONS OF THIS AGREEMENT TOOK PLACE IN THE
          STATE OF TEXAS AND THAT THIS AGREEMENT IS BEING EXECUTED AND DELIVERED
          IN THE  STATE OF  TEXAS,  OR,  IF  EXECUTED  ELSEWHERE,  SHALL  BECOME
          EFFECTIVE UPON AGENT'S RECEIPT AND ACCEPTANCE OF THE EXECUTED ORIGINAL
          OF THIS AGREEMENT IN THE STATE OF TEXAS.  VENTURER  ACKNOWLEDGES  THAT
          ANY CAUSE OF ACTION  ARISING UNDER THIS  AGREEMENT  WILL BE A CAUSE OF
          ACTION ARISING FROM A TEXAS TRANSACTION.  TO THE FULL EXTENT PERMITTED
          BY APPLICABLE  LAW,  VENTURER HEREBY SUBMITS ITSELF TO JURISDICTION IN
          THE STATE OF TEXAS FOR ANY ACTION OR CAUSE OF ACTION ARISING OUT OF OR
          IN  CONNECTION  WITH THIS  AGREEMENT,  AGREES  THAT VENUE FOR ANY SUCH
          ACTION SHALL BE IN HARRIS COUNTY, TEXAS, AND WAIVES ANY AND ALL RIGHTS
          UNDER THE LAWS OF ANY STATE TO OBJECT TO  JURISDICTION OR VENUE WITHIN
          HARRIS COUNTY, TEXAS. NOTWITHSTANDING THE FOREGOING, NOTHING CONTAINED
          IN THIS SECTION  SHALL  PREVENT  LENDERS  FROM  BRINGING ANY ACTION OR
          EXERCISING ANY RIGHTS AGAINST VENTURER,  ANY SECURITY FOR THE LOAN, OR
          ANY VENTURER'S  PROPERTIES IN ANY OTHER COUNTY, STATE OR JURISDICTION.
          INITIATING SUCH ACTION OR PROCEEDING OR TAKING ANY ACTION IN ANY OTHER
          COUNTY, STATE OR JURISDICTION SHALL IN NO EVENT CONSTITUTE A WAIVER BY
          AGENT OR  LENDERS OF ANY OF THE  FOREGOING.  This  Agreement  shall be
          binding upon the respective heirs, estates, administrators, executors,
          successors, successors-in-title, legal representatives and assigns of



                                       3

<PAGE>



          Venturer and shall inure to the benefit of Agent and Lenders and their
          respective  successors  and assigns.  Notwithstanding  the  foregoing,
          Venturer shall not be entitled to assign any of its right,  titles and
          interests   hereunder,   or  to  delegate  any  of  its   obligations,
          liabilities, duties or responsibilities hereunder, and will not permit
          any  such   assignment  or  delegation   to  occur   (voluntarily   or
          involuntarily,  or directly or indirectly),  without the prior written
          consent  of  Lenders.  Titles or  captions  of  articles  or  sections
          contained in this Agreement are provided for  convenience of reference
          only and in way defined,  limit,  extend or describe the scope of this
          Agreement or the intent of any provision  hereof.  The words "hereof,"
          "herein,"  and  "hereunder"  and words of similar  import when used in
          this Agreement shall refer to this Agreement as a whole and not to any
          particular  provision  of  this  Agreement.  In  the  event  that  any
          provisions this Agreement is held to be invalid or unenforceable, such
          invalidity  or  unenforceability  shall not  affect  the  validity  or
          enforceability of any other provision hereof.

         2. NO CONTROL BY LENDERS.  VENTURER AGREES AND ACKNOWLEDGES THAT ALL OF
THE  COVENANTS  AND  AGREEMENTS  PROVIDED  FOR AND MADE BY VENTURER IN THE JOINT
VENTURE PLEDGE  AGREEMENT (AS AMENDED  HEREBY) AND OTHERWISE,  ARE THE RESULT OF
EXTENSIVE AND ARMS-LENGTH  NEGOTIATIONS  BETWEEN VENTURER AND LENDERS.  VENTURER
HAS AGREED TO EXECUTE AND DELIVER THIS AMENDMENT AS  CONSIDERATION  FOR LENDERS'
AGREEMENT TO PROVIDE  CERTAIN  FINANCING TO BORROWERS.  VENTURER HAS BENEFITTED,
DIRECTLY AND INDIRECTLY BY ITS DELIVERY OF THIS AMENDMENT.

         3. Defined Terms.  Words and terms used herein which are defined in the
Joint Venture  Pledge  Agreement are used herein as defined in the Joint Venture
Pledge  Agreement,  except  as  specifically  modified  by  the  terms  of  this
Amendment.  Further,  all  references to the term  "Pledgor,"  herein and in the
Joint  Venture  Pledge  Agreement (as hereby  amended),  shall mean and refer to
Venturer (individually and collectively).

          4. Representations and Warranties.  The  representations,  warranties,
covenants, and agreements made by Venturer in the Joint Venture Pledge Agreement
(as amended hereby) are made again by Venturer as of the date of this Amendment.

         5.       Miscellaneous.

                 5.1 Governing  Law. THE TERMS AND  CONDITIONS OF THIS AMENDMENT
SHALL BE GOVERNED BY AND CONSTRUED IN  ACCORDANCE  WITH THE LAWS OF THE STATE OF
TEXAS AND OF THE UNITED STATES OF AMERICA APPLICABLE TO TRANSACTIONS  WITHIN THE
STATE OF TEXAS.

                  5.2  Counterparts.  This  Amendment  may be executed in two or
more  counterparts,  and it shall not be necessary  that the signa- tures of all
parties hereto be contained on any one counterpart



                                       4

<PAGE>



hereof. Each counterpart shall be deemed an original,  but all such counterparts
taken together shall constitute one and the same instrument.

                 5.3  Notice  of  Final  Agreement.  THE  JOINT  VENTURE  PLEDGE
AGREEMENT, AS AMENDED BY THIS AMENDMENT,  REPRESENTS THE FINAL AGREEMENT BETWEEN
THE PARTIES AND MAY NOT BE CONTRADICTED  BY EVIDENCE OF PRIOR,  CONTEMPORANEOUS,
OR  SUBSEQUENT  ORAL  AGREEMENTS  OF THE PARTIES.  THERE ARE NO ORAL  AGREEMENTS
BETWEEN THE PARTIES.

                 5.4 Preservation of the Joint Venture Pledge Agreement.  Except
as  specifically  modified  by the terms of this  Amendment,  all of the  terms,
provisions,  covenants,  warranties and agreements contained,  and all liens and
security interests granted, in the Joint Venture Pledge Agreement remain in full
force and  effect,  and the liens and  security  interests  granted  therein are
acknowledged to be valid and subsisting liens and security interests against the
Collateral.  Except as otherwise expressly provided herein, by execution of this
Amendment,  Venturer  and  Lenders  do not  intend to in any  manner  impair the
indebtedness  described in and secured by the Joint Venture Pledge Agreement (as
amended by this Amendment),  or to in any way impair, waive or release the liens
and security interests granted in the Joint Venture Pledge Agreement.

                 5.5 Reaffirmation of Joint Venture Pledge Agreement.  To secure
the  Liabilities  (as  defined in the Loan  Agreement),  Venturer  has granted a
security  interest  and by these  presents  does  grant to  Lenders  and Agent a
security interest, in and to all of its rights,  titles, and interests in and to
the Collateral.

                  IN WITNESS  WHEREOF,  the  parties  have  executed  this First
Amendment as of the date first above written.

                                          VENTURER:

WITNESS:                                  SEITEL OFFSHORE CORP.


                                          By: /s/ Debra D. Valice
                                             --------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer



                                 LENDERS/AGENT:

WITNESS:                                  COMPASS BANK-HOUSTON, for itself
                                          and as Agent


                                          By: /s/ Dorothy M. Wilson
                                             --------------------------
                                             Dorothy M. Wilson,
                                             Vice President




                                                         5

<PAGE>


WITNESS:                                  BANK ONE, TEXAS, NATIONAL
                                          ASSOCIATION


                                          By: /s/ Damien Meiburger
                                             --------------------------
                                             Damien Meiburger,
                                             Senior Vice President





                                       6




                         AMENDMENT TO PLEDGE AGREEMENT


               This Amendment to Pledge Agreement (this "Amendment") is made and
entered  into  effective  as of the 31st day of  December,  1994,  by and  among
SEITEL,  INC.,  a Delaware  corporation,  SEITEL  GEOPHYSICAL,  INC., a Delaware
corporation,  and  SEITEL  DATA  CORP.,  a Delaware  corporation  (collectively,
"Pledgor");  and BANK ONE,  TEXAS,  NATIONAL  ASSOCIATION,  a  national  banking
association  ("Bank  One");  and COMPASS  BANK-HOUSTON,  a Texas  state  banking
association (collectively with Bank One, "Lenders").

                              W I T N E S S E T H:

               WHEREAS,  Seitel,  Inc.  has  executed  a Pledge  Agreement  (the
"Pledge  Agreement")  dated effective  February 28, 1994,  granting to Lenders a
continuing  security  interest  in and to,  among other  things,  all of Seitel,
Inc.'s  shares of  capital  stock in and to its  wholly-owned  subsidiaries,  as
security  for,  among  other  things,  the payment  and  performance  of certain
indebtedness  and  obligations  owing by Pledgor  and certain  other  parties to
Lenders, as more fully described in the Pledge Agreement; and

               WHEREAS,  Seitel,  Inc., each of the other Pledgors,  and Lenders
desire to amend and modify certain terms and provisions of the Pledge Agreement.

               NOW, THEREFORE, for good and valuable consideration,  the receipt
and  sufficiency of which are hereby  acknowledged,  Seitel,  Inc.,  each of the
other Pledgors, and Lenders agree as follows:

          1. Amendments to Pledge  Agreement.  The Pledge  Agreement is modified
and amended as follows:

             1.1  The  first  grammatical  paragraph  on  Page 1 of  the  Pledge
Agreement is deleted in its entirety and the following is  substituted  in place
thereof:

               PLEDGE AGREEMENT  entered into on March 18, 1994, but which shall
          be effective as of February  28, 1994,  from SEITEL,  INC., a Delaware
          corporation   ("Seitel"),   SEITEL   GEOPHYSICAL,   INC.,  a  Delaware
          corporation   ("Geophysical")   and  SEITEL  DATA  CORP.,  a  Delaware
          corporation (collectively with Seitel and Geophysical,  "Pledgor"), in
          favor of  COMPASS  BANK-HOUSTON,  a Texas  state  banking  association
          ("Bank"),  and of BANK ONE,  TEXAS,  N.A.  ("Bank One;"  together with
          Bank, the "Lenders"), and COMPASS BANK-HOUSTON, as agent (the "Agent")
          for  the  Lenders;  each  of  whom  are  signatories  to the  Restated
          Revolving  Credit and Pledge  Agreement dated as of December 31, 1994,
          among each Pledgor,  Exsol,  Inc.  ("Exsol"),  Seitel  Offshore  Corp.
          ("Offshore"), and the Lenders (the "Credit Agreement").





<PAGE>



             1.2 Each of the  premises  on Page 1 of the  Pledge  Agreement  are
deleted in their entirety and the following are substituted in place thereof:

               WHEREAS,   each  Pledgor  is  a  party  to  the  Credit
          Agreement;

               WHEREAS,  Geophysical,  Exsol, Geo-Bank, Inc., Seitel Data Corp.,
          Alternative Communication Enterprises, Inc., Matrix Geophysical, Inc.,
          and   Seitel   Gas  &  Energy   Corp.   (collectively,   the   "Seitel
          Subsidiaries") are each direct, wholly owned subsidiaries of Seitel;

               WHEREAS,  African  Geophysical,  Inc. (the "Geophysical
          Subsidiary")  is the  direct,  wholly  owned  subsidiary  of
          Geophysical;

               WHEREAS,    Datatel,   Inc.,   Offshore,   and   Seitel
          International,    Inc.   (collectively   with   the   Seitel
          Subsidiaries   and   the   Geophysical    Subsidiary,    the
          "Subsidiaries")  are directly,  wholly owned subsidiaries of
          Seitel Data Corp.;

               WHEREAS, each Pledgor desires that the Lenders make available the
          Revolving Line (as defined in the Credit  Agreement) to them and Exsol
          in accordance with the terms of the Credit Agreement; and

               WHEREAS,  it is a condition  precedent  to the  extending  of the
          Revolving  Line that each  Pledgor  shall have  granted  the  security
          interest  contemplated by this Agreement to secure the Liabilities (as
          such term is defined in the Credit Agreement and is hereafter used);

             1.3 Section  7(b) on Page 8 of the Pledge  Agreement  is deleted in
its entirety and the following is substituted in place thereof:

               Without  limiting the foregoing,  the Lenders and the Agent shall
          have the rights and  remedies of a secured  party under Texas  Uniform
          Commercial  Code in  addition  to the  rights  and  remedies  provided
          herein.

             1.4 Section 21 on Page 17 of the Pledge Agreement is deleted in its
entirety and the following is substituted in place thereof:

               THIS AGREEMENT  SHALL BE PERFORMED IN AND CONSTRUED IN ACCORDANCE
          WITH AND  GOVERNED  BY THE LAWS OF THE STATE OF TEXAS  WITHOUT  GIVING
          EFFECT TO THE CHOICE OF LAW PROVISIONS THEREOF.

             1.5 All  references in the Pledge  Agreement to the Loan  Documents
shall refer to the Credit Documents under and as defined



                                       2

<PAGE>



in the Credit Agreement, as each may be amended and modified from time to time.

          2. Release of DDD Energy,  Inc.  Stock.  Pledgor and Lenders agree and
acknowledge  that the  pledge  by  Seitel,  Inc.  of the  capi- tal stock of DDD
Energy, Inc. under and pursuant to the Pledge Agreement is hereby discharged and
released in order that the capi- tal stock of DDD Energy, Inc. may be pledged by
Seitel,  Inc. as security  for the payment of a certain  credit  facility to DDD
Energy, Inc. from Lenders.

          3. NO CONTROL BY LENDERS.  PLEDGOR AGREES AND ACKNOWLEDGES THAT ALL OF
THE  COVENANTS  AND  AGREEMENTS  PROVIDED  FOR AND MADE BY PLEDGOR IN THE PLEDGE
AGREEMENT  (AS AMENDED  HEREBY) AND  OTHERWISE,  ARE THE RESULT OF EXTENSIVE AND
ARMS-LENGTH  NEGOTIATIONS  BETWEEN  PLEDGOR AND  LENDERS.  PLEDGOR HAS AGREED TO
EXECUTE AND DELIVER THIS AMENDMENT AS  CONSIDERATION  FOR LENDERS'  AGREEMENT TO
PROVIDE CERTAIN  FINANCING TO BORROWERS.  EACH PLEDGOR HAS BENEFITTED,  DIRECTLY
AND INDIRECTLY BY ITS DELIVERY OF THIS AMENDMENT.

          4. Defined Terms. Words and terms used herein which are defined in the
Pledge Agreement are used herein as defined in the Pledge  Agreement,  except as
specifically modified by the terms of this Amendment. Further, all references to
the term  "Pledgor,"  herein and in the Pledge  Agreement  (as hereby  amended),
shall mean and refer to each Pledgor (individually and collectively).

          5. Representations and Warranties.  The  representations,  warranties,
covenants,  and agreements  made by Pledgor in the Pledge  Agreement (as amended
hereby) are made again by each Pledgor (indi- vidually and  collectively)  as of
the date of this Amendment.

          6. Miscellaneous.

             6.1 Governing Law. THE TERMS AND CONDITIONS OF THIS AMENDMENT SHALL
BE GOVERNED BY AND CONSTRUED IN  ACCORDANCE  WITH THE LAWS OF THE STATE OF TEXAS
AND OF THE UNITED STATES OF AMERICA APPLICABLE TO TRANSACTIONS  WITHIN THE STATE
OF TEXAS.

             6.2  Counterparts.  This  Amendment  may be executed in two or more
counterparts,  and it shall not be necessary  that the signatures of all parties
hereto be contained on any one counterpart  hereof.  Each  counterpart  shall be
deemed an original,  but all such  counterparts  taken together shall constitute
one and the same instrument.

             6.3 Notice of Final Agreement.  THE PLEDGE AGREEMENT, AS AMENDED BY
THIS AMENDMENT,  REPRESENTS THE FINAL AGREEMENT  BETWEEN THE PARTIES AND MAY NOT
BE  CONTRADICTED  BY EVIDENCE OF PRIOR,  CON-  TEMPORANEOUS,  OR SUBSEQUENT ORAL
AGREEMENTS OF THE PARTIES. THERE ARE NO ORAL AGREEMENTS BETWEEN THE PARTIES.

             6.4  Preservation of the Pledge  Agreement.  Except as specifically
modified by the terms of this Amendment, all of the



                                       3

<PAGE>



terms, provisions, covenants, warranties and agreements contained, and all liens
and security interests granted, in the Pledge Agreement remain in full force and
effect, and the liens and security interests granted therein are acknowledged to
be valid and subsisting  liens and security  interests  against the  Collateral.
Except as otherwise  expressly  provided herein, by execution of this Amendment,
each Pledgor and Lenders do not intend to in any manner impair the  indebtedness
described in and secured by the Pledge Agreement (as amended by this Amendment),
or to in any way  impair,  waive or  release  the liens and  security  interests
granted in the Pledge Agreement.

                 6.5   Reaffirmation   of  Pledge   Agreement.   To  secure  the
Liabilities  (as defined in the Credit  Agreement),  each  Pledgor has granted a
security  interest  and by these  presents  does  grant to  Lenders  and Agent a
security  interest,  in and  to all of  their  respective  rights,  titles,  and
interests in and to the Collateral.

          IN WITNESS WHEREOF,  the parties have executed this First Amendment as
of the date first above written.


                                          PLEDGOR:

WITNESS:                                  SEITEL, INC.

                                          By: /s/ Debra D. Valice
                                             --------------------------
                                             Debra D. Valice, Vice President
                                             of Finance, Chief Financial
                                             Officer, Treasurer, and
                                             Secretary


WITNESS:                                  SEITEL GEOPHYSICAL, INC.


                                          By: /s/ Debra D. Valice
                                             --------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer


WITNESS:                                   SEITEL DATA CORP.


                                           By: /s/ Debra D. Valice
                                             --------------------------
                                             Debra D. Valice,
                                             Secretary and Treasurer



                      (Signatures Continued on Next Page)




                                       4

<PAGE>


                                         AGENT/LENDERS:

WITNESS:                                  COMPASS BANK-HOUSTON, as a Lender
                                          and as Agent


                                          By: /s/ Dorothy M. Wilson
                                             --------------------------
                                             Dorothy M. Wilson,
                                             Vice President



WITNESS:                                  BANK ONE, TEXAS, NATIONAL
                                          ASSOCIATION


                                          By: /s/ Damien Meiburger
                                             --------------------------
                                             Damien Meiburger,
                                             Senior Vice President






                                       5


<TABLE> <S> <C>

<ARTICLE>         5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               MAR-31-1995
<CASH>                                           3,661
<SECURITIES>                                         0
<RECEIVABLES>                                   34,005
<ALLOWANCES>                                     (100)
<INVENTORY>                                          0
<CURRENT-ASSETS>                                     0<F1>
<PP&E>                                          44,234<F2>
<DEPRECIATION>                                   5,337
<TOTAL-ASSETS>                                 177,640
<CURRENT-LIABILITIES>                                0<F1>
<BONDS>                                         19,679
<COMMON>                                            90
                                0
                                          0
<OTHER-SE>                                     106,525
<TOTAL-LIABILITY-AND-EQUITY>                   177,640
<SALES>                                         21,158
<TOTAL-REVENUES>                                21,158
<CGS>                                            4,268
<TOTAL-COSTS>                                    4,268
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 834
<INCOME-PRETAX>                                  4,721
<INCOME-TAX>                                     1,747
<INCOME-CONTINUING>                              2,974
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,974
<EPS-PRIMARY>                                    0.310
<EPS-DILUTED>                                    0.290
<FN>
<F1>The Company does not present a classified balance sheet; therefore,  current
assets and current  liabilities  is not  reflected  in the  Company's  financial
statements.
<F2>PP&E  does not include  seismic data bank assets with a cost of
$209,814,000  and  related  accumulated  amortization  of  $110,229,000. 
</FN>
        

</TABLE>


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission