Document:

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                          REGISTRATION RIGHTS AGREEMENT

      This Registration Rights Agreement (this "Agreement") is made and entered
into as of May 17, 2005, by and between OMNI Energy Services Corp., a Louisiana
corporation (the "Company"), and the purchasers of the Company's Series C 9%
Convertible Preferred Stock that are signatories hereto (each a "Purchaser" and
collectively, the "Purchasers").

      This Agreement is made pursuant to the Securities Purchase Agreement,
dated as of the date hereof, by and between the Purchasers and the Company (the
"Purchase Agreement"), and pursuant to the Warrants referred to therein.
Capitalized terms used but not defined herein shall have the meaning set forth
in the Purchase Agreement.

      The Company and the Purchasers hereby agree as follows:

      1. Definitions. As used in this Agreement, the following terms shall have
the following meanings:

      "Commission" means the Securities and Exchange Commission.

      "Common Stock" means shares of the Company's common stock, par value $0.01
per share.

      "Effectiveness Date" means the 90th day following the Filing Date.

      "Effectiveness Period" shall have the meaning set forth in Section 2(a).

      "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
any successor statute.

      "Filing Date" means, with respect to the Registration Statement required
to be filed hereunder, a date no later than sixty (60) days following the date
hereof and, with respect to shares of Common Stock issuable to the Holder as a
result of adjustments to the conversion price of the Series C Stock or the
exercise price of the Warrants, pursuant to their respective terms, sixty (60)
days after the occurrence of such event or the date of such adjustment.

      "Holder" or "Holders" means the Purchasers or any of its affiliates or
transferees to the extent any of them hold Registrable Securities.

      "Indemnified Party" shall have the meaning set forth in Section 6(c).

      "Indemnifying Party" shall have the meaning set forth in Section 6(c).

      "Person" means any individual, corporation, partnership, limited liability
company or other legal entity.

      "Proceeding" means an action, claim, suit, investigation or proceeding
(including, without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

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      "Prospectus" means the prospectus included in the Registration Statement
(including, without limitation, a prospectus that includes any information
previously omitted from a prospectus filed as part of an effective registration
statement in reliance upon Rule 430A promulgated under the Securities Act), as
amended or supplemented by any prospectus supplement, with respect to the terms
of the offering of any portion of the Registrable Securities covered by the
Registration Statement, and all other amendments and supplements to the
Prospectus, including post-effective amendments, and all material incorporated
by reference or deemed to be incorporated by reference in such Prospectus.

      "Registrable Securities" means the shares of Common Stock issued upon the
conversion of the Series C Stock, exercise of the Warrants or as dividends on
the Series C Stock.

      "Registration Statement" means each registration statement required to be
filed hereunder, including the Prospectus.

      "Rule 144" means Rule 144 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

      "Rule 415" means Rule 415 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

      "Rule 424" means Rule 424 promulgated by the Commission pursuant to the
Securities Act, as such Rule may be amended from time to time, or any similar
rule or regulation hereafter adopted by the Commission having substantially the
same effect as such Rule.

      "Securities Act" means the Securities Act of 1933, as amended, and any
successor statute.

      "Series C Stock" means the Series C 9% Convertible Preferred Stock.

      "Trading Market" means any of the NASD OTC Bulletin Board, NASDAQ SmallCap
Market, the Nasdaq National Market, the American Stock Exchange or the New York
Stock Exchange.

      "Warrants" means the Common Stock purchase warrants issued pursuant to the
Purchase Agreement.

      2.    Registration.

            (a) On or prior to the Filing Date the Company shall prepare and
file with the Commission a Registration Statement covering the Registrable
Securities for an offering to be made on a continuous basis pursuant to Rule
415. The Registration Statement shall be on Form S-3 (except if the Company is
not then eligible to register for resale the Registrable Securities on Form S-3,
in which case such registration shall be on another appropriate form in
accordance herewith). The Company shall cause the Registration Statement to
become effective and remain effective as provided herein. The Company shall use
its reasonable commercial efforts to cause the Registration Statement to be
declared effective under the Securities Act as promptly as possible after the
filing thereof, but in any event no later than the Effectiveness Date. The
Company shall use its reasonable

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commercial efforts to keep the Registration Statement continuously effective
under the Securities Act until the date which is the earlier date of when (i)
all Registrable Securities have been sold or (ii) all Registrable Securities may
be sold immediately without registration under the Securities Act and without
volume restrictions pursuant to Rule 144(k), as determined by the counsel to the
Company pursuant to a written opinion letter to such effect, addressed and
acceptable to the Company's transfer agent and the affected Holders (the
"Effectiveness Period").

            (b) If: (i) the Registration Statement is not filed on or prior to
the Filing Date; (ii) the Registration Statement is not declared effective by
the Commission by the Effectiveness Date; (iii) after the Registration Statement
is filed with and declared effective by the Commission, the Registration
Statement ceases to be effective (by suspension or otherwise) as to all
Registrable Securities to which it is required to relate at any time prior to
the expiration of the Effectiveness Period (without being succeeded immediately
by an additional registration statement filed and declared effective) for a
period of time which shall exceed 30 days in the aggregate per year or more than
20 consecutive calendar days (defined as a period of 365 days commencing on the
date the Registration Statement is declared effective); or (iv) the Common Stock
is not listed or quoted, or is suspended from trading on any Trading Market for
a period of three (3) consecutive Trading Days (provided the Company shall not
have been able to cure such trading suspension within 30 days of the notice
thereof or list the Common Stock on another Trading Market); (any such failure
or breach being referred to as an "Event," and for purposes of clause (i) or
(ii) the date on which such Event occurs, or for purposes of clause (iii) the
date which such 30 day or 20 consecutive day period (as the case may be) is
exceeded, or for purposes of clause (iv) the date on which such three (3)
Trading Day period is exceeded, being referred to as "Event Date"), then during
the period beginning on the Event Date and ending on (but not including) the
date that the applicable Event is cured, the Company shall pay to each Holder an
amount in cash, as liquidated damages and not as a penalty, equal to 2.0% for
each thirty (30) day period (prorated for partial periods on a daily basis) of
the Purchase Price of the Registrable Securities then held by such Holder and
the amount by which the Warrants are in the money. While such Event continues,
such liquidated damages shall be paid not less often than each thirty (30) days.
Any unpaid liquidated damages as of the date when an Event has been cured by the
Company shall be paid within five (5) days following the date on which such
Event has been cured by the Company.

            (c) Within three (3) business days following the date on which the
Registration Statement is declared effective by the Commission, and assuming no
stop-order has been issued with respect to the Registration Statement, the
Company shall furnish to each Holder (x) a letter, dated such date, of outside
counsel representing the Company addressed to such Holder, confirming such
effectiveness and, to the knowledge of such counsel, the absence of any stop
order, and (y) in the case of an underwriting (or if the Commission deems such
Holder as an underwriter for disclosure purposes), (A) a copy of an opinion,
dated such date, of such outside counsel, in such form and substance as is
required to be given to the underwriters, and (B) a letter addressed to such
Holder, dated such date, from the Company's independent certified public
accountants, in such form and substance as is required to be given by the
Company's independent certified public accountants to such underwriters.

      3.    Registration Procedures. If and whenever the Company is required by
the provisions hereof to effect the registration of any Registrable Securities
under the Securities Act, the Company will, as expeditiously as possible:

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            (a) prepare and file with the Commission such amendments and
supplements to the Registration Statement and the Prospectus used in connection
therewith as may be necessary to comply with the provisions of the Securities
Act with respect to the disposition of all Registrable Securities covered by the
Registration Statement and to keep such Registration Statement effective until
the expiration of the Effectiveness Period;

            (b) upon the effectiveness of the Registration Statement, furnish to
the Purchaser such number of copies of the Registration Statement and the
Prospectus included therein (including each preliminary Prospectus) as the
Purchaser reasonably may request to facilitate the public sale or disposition of
the Registrable Securities covered by the Registration Statement;

            (c) use its commercially reasonable efforts to register or qualify
the Purchaser's Registrable Securities covered by the Registration Statement
under the securities or "blue sky" laws of such jurisdictions within the United
States as the Purchaser may reasonably request, provided, however, that the
Company shall not for any such purpose be required to qualify generally to
transact business as a foreign corporation in any jurisdiction where it is not
so qualified or to consent to general service of process in any such
jurisdiction;

            (d) list the Registrable Securities covered by the Registration
Statement with any securities exchange on which the Common Stock of the Company
is then listed;

            (e) immediately notify the Purchaser at any time when a Prospectus
relating thereto is required to be delivered under the Securities Act, of the
happening of any event of which the Company has knowledge as a result of which
the Prospectus contained in such Registration Statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing; and

            (f) make available for inspection by the Purchasers and any
attorney, accountant or other agent retained by the Purchasers, upon reasonable
prior notice, all publicly available, non-confidential financial and other
records, pertinent corporate documents and properties of the Company, and cause
the Company's officers, directors and employees to supply all publicly
available, non-confidential information reasonably requested by the attorney,
accountant or agent of the Purchasers.

      4.    Obligations of each Holder. In connection with the registration of
Registrable Securities pursuant to a Registration Statement, each Holder shall:

            (a) timely furnish to the Company in writing such information
regarding itself and the intended method of disposition of such Registrable
Securities as the Company shall reasonably request in order to effect the
registration thereof;

            (b) upon receipt of any notice from the Company of the happening of
any Discontinuation Event described in Section 7(d), immediately discontinue any
sale or other disposition of such Registrable Securities pursuant to such
Registration Statement until the filing of an amendment or supplement is
delivered to the Holder as described in Section 7(d), and use commercially
reasonable efforts to maintain the confidentiality of such notice and its
contents;

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            (c) in the event of an underwritten offering of such Registrable
Securities in which such Holder participates, enter into a customary and
reasonable underwriting agreement and execute such other documents as the
Company and the managing underwriter for such offering may reasonably request;

            (d) notify the Company when it has sold all of the Registrable
Securities held by it; and

            (e) notify the Company in the event that any information supplied by
such Holder for inclusion in such Registration Statement or related prospectus
is untrue or omits to state a material fact required to be stated therein or
necessary to make such information not misleading in light of the circumstances
then existing; immediately discontinue any sale or other disposition of such
Registrable Securities pursuant to such Registration Statement until the filing
of an amendment or supplement to such prospectus as may be necessary so that
such prospectus does not contain an untrue statement of material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading in light of the circumstances then existing;
and use commercially reasonable efforts to assist the Company as may be
appropriate to make such amendment or supplement effective for such purpose.

      5.    Registration Expenses. All expenses relating to the Company's
compliance with Sections 2 and 3 hereof, including, without limitation, all
registration and filing fees, printing expenses, fees and disbursements of
counsel and independent public accountants for the Company, fees and expenses
(including reasonable counsel fees) incurred in connection with complying with
state securities or "blue sky" laws, fees of the NASD, transfer taxes, fees of
transfer agents and registrars, fees of, and disbursements incurred by, one
counsel for the Holders (to the extent such counsel is required due to Company's
failure to meet any of its obligations hereunder), are called "Registration
Expenses." All selling commissions applicable to the sale of Registrable
Securities, including any fees and disbursements of any special counsel to the
Holders beyond those included in Registration Expenses, are called "Selling
Expenses." The Company shall only be responsible for all Registration Expenses
and shall not be responsible for the Selling Expenses.

      6.    Indemnification.

            (a) In the event of a registration of any Registrable Securities
under the Securities Act pursuant to this Agreement, the Company will indemnify
and hold harmless the Purchasers, and their officers, directors and each other
person, if any, who controls the Purchasers within the meaning of the Securities
Act, against any losses, claims, damages or liabilities, joint or several, to
which the Purchasers, or such persons may become subject under the Securities
Act or otherwise, insofar as such losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon any untrue statement
or alleged untrue statement of any material fact contained in any Registration
Statement under which such Registrable Securities were registered under the
Securities Act pursuant to this Agreement, any preliminary Prospectus or final
Prospectus contained therein, or any amendment or supplement thereof, or arise
out of or are based upon the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, and, subject to the provisions of Section 6(c) below,
will reimburse the Purchasers, and each such person for any reasonable legal (of
no more than one separate counsel) or other expenses reasonably incurred by them
in connection with investigating or defending any such loss, claim, damage,
liability or action; provided, however, that

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the Company will not be liable in any such case if and to the extent that any
such loss, claim, damage or liability arises out of or is based upon (i) an
untrue statement or alleged untrue statement or omission or alleged omission so
made in conformity with information furnished by or on behalf of any Purchaser
or any such person specifically for use in any such document, or (ii) a failure
of such person to deliver or cause to be delivered the final Prospectus
contained in the Registration Statement and made available by the Company, if
such delivery is required by applicable law.

            (b) In the event of a registration of any Registrable Securities
under the Securities Act pursuant to this Agreement, each Purchaser will
indemnify and hold harmless the Company, and its officers, directors and each
other person, if any, who controls the Company within the meaning of the
Securities Act, against all losses, claims, damages or liabilities, joint or
several, to which the Company or such persons may become subject under the
Securities Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact which was
furnished by such Purchaser to the Company expressly for use in (and such
information is contained in) the Registration Statement under which such
Registrable Securities were registered under the Securities Act pursuant to this
Agreement, any preliminary Prospectus or final Prospectus contained therein, or
any amendment or supplement thereof, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, and,
subject to the provisions of Section 6(c) below, will reimburse the Company and
each such person for any reasonable legal (of no more than one separate counsel)
or other expenses incurred by them in connection with investigating or defending
any such loss, claim, damage, liability or action, provided, however, that such
Purchaser will be liable in any such case if and only to the extent that any
such loss, claim, damage or liability arises out of or is based upon (i) an
untrue statement or alleged untrue statement or omission or alleged omission so
made in conformity with information furnished to the Company by or on behalf of
such Purchaser specifically for use in any such document, or (ii) a failure of
such person to deliver or cause to be delivered the final Prospectus contained
in the Registration Statement and made available by the Company, if such
delivery is required by applicable law. Notwithstanding the provisions of this
paragraph, no Purchaser shall be required to indemnify any person or entity in
excess of the amount of the aggregate net proceeds received by such Purchaser in
respect of Registrable Securities in connection with any such registration under
the Securities Act.

            (c) Promptly after receipt by a party entitled to claim
indemnification hereunder (an "Indemnified Party") of notice of the commencement
of any action, such Indemnified Party shall, if a claim for indemnification in
respect thereof is to be made against a party hereto obligated to indemnify such
Indemnified Party (an "Indemnifying Party"), notify the Indemnifying Party in
writing thereof, but the omission so to notify the Indemnifying Party shall not
relieve it from any liability which it may have to such Indemnified Party other
than under this Section 6(c) and shall only relieve it from any liability which
it may have to such Indemnified Party under this Section 6(c) if and to the
extent the Indemnifying Party is prejudiced by such omission. In case any such
action shall be brought against any Indemnified Party and it shall notify the
Indemnifying Party of the commencement thereof, the Indemnifying Party shall be
entitled to participate in and, to the extent it shall wish, to assume and
undertake the defense thereof with counsel satisfactory to such Indemnified
Party, and, after notice from the Indemnifying Party to such Indemnified Party
of its election so to assume and undertake the defense thereof, the Indemnifying
Party shall not be liable to such Indemnified Party under this Section 6(c) for
any legal expenses subsequently incurred by such Indemnified Party in connection
with the defense thereof; if the Indemnified Party retains its

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own counsel, then the Indemnified Party shall pay all fees, costs and expenses
of such counsel, provided, however, that, if the defendants in any such action
include both the indemnified party and the Indemnifying Party and the
Indemnified Party shall have reasonably concluded that there may be reasonable
defenses available to it which are different from or additional to those
available to the Indemnifying Party or if the interests of the Indemnified Party
reasonably may be deemed to conflict with the interests of the Indemnifying
Party, the Indemnified Party shall have the right to select one separate counsel
and to assume such legal defenses and otherwise to participate in the defense of
such action, with the reasonable expenses and fees of such separate counsel and
other expenses related to such participation to be reimbursed by the
Indemnifying Party as incurred.

            (d) In order to provide for just and equitable contribution in the
event of joint liability under the Securities Act in any case in which either
(i) a Purchaser, or any officer, director or controlling person of a Purchaser,
makes a claim for indemnification pursuant to this Section 6 but it is
judicially determined (by the entry of a final judgment or decree by a court of
competent jurisdiction and the expiration of time to appeal or the denial of the
last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that this Section 6 provides for indemnification in
such case, or (ii) contribution under the Securities Act may be required on the
part of such Purchaser or such officer, director or controlling person of such
Purchaser in circumstances for which indemnification is provided under this
Section 6; then, and in each such case, the Company and such Purchaser will
contribute to the aggregate losses, claims, damages or liabilities to which they
may be subject (after contribution from others) in such proportion so that such
Purchaser is responsible only for the portion represented by the percentage that
the public offering price of its securities offered by the Registration
Statement bears to the public offering price of all securities offered by such
Registration Statement, provided, however, that, in any such case, (A) such
Purchaser will not be required to contribute any amount in excess of the public
offering price of all such securities offered by it pursuant to such
Registration Statement; and (B) no person or entity guilty of fraudulent
misrepresentation (within the meaning of Section 10(f) of the Act) will be
entitled to contribution from any person or entity who was not guilty of such
fraudulent misrepresentation.

      7.    Miscellaneous.

            (a) Remedies. In the event of a breach by the Company or by a
Holder, of any of their respective obligations under this Agreement, each Holder
or the Company, as the case may be, in addition to being entitled to exercise
all rights granted by law and under this Agreement, including recovery of
damages, will be entitled to specific performance of its rights under this
Agreement.

            (b) No Piggyback on Registrations. Except as and to the extent
specified in Schedule 7(b) hereto, neither the Company nor any of its security
holders (other than the Holders in such capacity pursuant hereto) may include
securities of the Company in any Registration Statement other than the
Registrable Securities, and the Company shall not after the date hereof enter
into any agreement providing any such right for inclusion of shares in the
Registration Statement to any of its security holders. Except as and to the
extent specified in Schedule 7(b) hereto, the Company has not previously entered
into any agreement granting any registration rights with respect to any of its
securities to any Person that have not been fully satisfied.

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            (c) Compliance. Each Holder covenants and agrees that it will comply
with the prospectus delivery requirements of the Securities Act as applicable to
it in connection with sales of Registrable Securities pursuant to the
Registration Statement.

            (d) Discontinued Disposition. Each Holder agrees by its acquisition
of such Registrable Securities that, upon receipt of a notice from the Company
of the occurrence of a Discontinuation Event (as defined below), such Holder
will forthwith discontinue disposition of such Registrable Securities under the
applicable Registration Statement until such Holder's receipt of the copies of
the supplemented Prospectus and/or amended Registration Statement or until it is
advised in writing (the "Advice") by the Company that the use of the applicable
Prospectus may be resumed, and, in either case, has received copies of any
additional or supplemental filings that are incorporated or deemed to be
incorporated by reference in such Prospectus or Registration Statement. The
Company may provide appropriate stop orders to enforce the provisions of this
paragraph. For purposes of this Section 7(d), a "Discontinuation Event" shall
mean (i) when the Commission notifies the Company whether there will be a
"review" of such Registration Statement and whenever the Commission comments in
writing on such Registration Statement (the Company shall provide true and
complete copies thereof and all written responses thereto to each of the
Holders); (ii) any request by the Commission or any other Federal or state
governmental authority for amendments or supplements to such Registration
Statement or Prospectus or for additional information; (iii) the issuance by the
Commission of any stop order suspending the effectiveness of such Registration
Statement covering any or all of the Registrable Securities or the initiation of
any Proceedings for that purpose; (iv) the receipt by the Company of any
notification with respect to the suspension of the qualification or exemption
from qualification of any of the Registrable Securities for sale in any
jurisdiction, or the initiation or threatening of any Proceeding for such
purpose; and/or (v) the occurrence of any event or passage of time that makes
the financial statements included in such Registration Statement ineligible for
inclusion therein or any statement made in such Registration Statement or
Prospectus or any document incorporated or deemed to be incorporated therein by
reference untrue in any material respect or that requires any revisions to such
Registration Statement, Prospectus or other documents so that, in the case of
such Registration Statement or Prospectus, as the case may be, it will not
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein,
in light of the circumstances under which they were made, not misleading.

            (e) Piggy-Back Registrations. If at any time during the
Effectiveness Period there is not an effective Registration Statement covering
all of the Registrable Securities and the Company shall determine to prepare and
file with the Commission a registration statement relating to an offering for
its own account or the account of others under the Securities Act of any of its
equity securities, other than on Form S-4 or Form S-8 (each as promulgated under
the Securities Act) or their then equivalents relating to equity securities to
be issued solely in connection with any acquisition of any entity or business or
equity securities issuable in connection with stock option or other employee
benefit plans, then the Company shall send to each Holder written notice of such
determination and, if within fifteen (15) days after receipt of such notice, any
such Holder shall so request in writing, the Company shall use its best efforts
to include in such registration statement all or any part of such Registrable
Securities such holder requests to be registered to the extent the Company may
do so without violating registration rights of others which exist as of the date
of this Agreement, subject to customary underwriter cutbacks applicable to all
holders of registration rights and subject to obtaining any required the consent
of any selling stockholder(s) to such inclusion

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under such registration statement. The Company shall have a right to postpone,
delay or withdraw any registration pursuant to this Section 7(e) without
obligation to the Holder.

            (f) Amendments and Waivers. The provisions of this Agreement,
including the provisions of this sentence, may not be amended, modified or
supplemented, and waivers or consents to departures from the provisions hereof
may not be given, unless the same shall be in writing and signed by the Company
and the Holders of at least two-thirds (2/3) of the then outstanding Registrable
Securities (without regard to any limitation on conversion or exercise of the
Registrable Securities). Notwithstanding the foregoing, a waiver or consent to
depart from the provisions hereof with respect to a matter that relates
exclusively to the rights of certain Holders and that does not directly or
indirectly affect the rights of other Holders may be given by Holders of at
least a majority of the Registrable Securities to which such waiver or consent
relates; provided, however, that the provisions of this sentence may not be
amended, modified, or supplemented except in accordance with the provisions of
the immediately preceding sentence.

            (g) Notices. Any notice or request hereunder may be given to the
Company or the Purchasers at the respective addresses set forth in the Purchase
Agreement or as may hereafter be specified in a notice designated as a change of
address under this Section 7(g). Any notice or request hereunder shall be given
by registered or certified mail, return receipt requested, hand delivery,
overnight mail, Federal Express or other national overnight next day carrier
(collectively, "Courier") or telecopy (confirmed by mail). Notices and requests
shall be, in the case of those by hand delivery, deemed to have been given when
delivered to any party to whom it is addressed, in the case of those by mail or
overnight mail, deemed to have been given three (3) business days after the date
when deposited in the mail or with the overnight mail carrier, in the case of a
Courier, the next business day following timely delivery of the package with the
Courier, and, in the case of a telecopy, when confirmed.

            (h) Successors and Assigns. This Agreement shall inure to the
benefit of and be binding upon the successors and permitted assigns of each of
the parties and shall inure to the benefit of each Holder. The Company may not
assign its rights or obligations hereunder without the prior written consent of
each Holder. Each Holder may assign their respective rights hereunder in
connection with the transfer of the Shares or Warrants as long as: (i) the
Company is, within a reasonable period of time following such transfer,
furnished with written notice of the name and address of such transferee, (ii)
the transferee agrees in writing with the Company to be bound by all of the
provisions hereof, and (iii) such transfer is made in accordance with the
applicable requirements of the Purchase Agreement and with the prior consent of
the Company, which consent shall not be unreasonably withheld; provided,
however, that the registration rights granted in this Agreement shall not be
transferred to any person or entity that receives any Shares, Warrants or
Registrable Securities in a public transaction pursuant to an effective
registration statement under the Securities Act or pursuant to Rule 144.

            (i) Execution and Counterparts. This Agreement may be executed in
any number of counterparts, each of which when so executed shall be deemed to be
an original and, all of which taken together shall constitute one and the same
Agreement. In the event that any signature is delivered by facsimile
transmission, such signature shall create a valid binding obligation of the
party executing (or on whose behalf such signature is executed) the same with
the same force and effect as if such facsimile signature were the original
thereof.

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            (j) Governing Law. All questions concerning the construction,
validity, enforcement and interpretation of this Agreement shall be governed by
and construed and enforced in accordance with the laws of the State of Delaware,
without regard to the principles of conflicts of law thereof. Each party hereto
hereby irrevocably waives personal service of process and consents to process
being served in any such Proceeding by mailing a copy thereof via registered or
certified mail or overnight delivery (with evidence of delivery) to such party
at the address in effect for notices to it under this Agreement and agrees that
such service shall constitute good and sufficient service of process and notice
thereof. Nothing contained herein shall be deemed to limit in any way any right
to serve process in any manner permitted by law. Each party hereto hereby
irrevocably waives, to the fullest extent permitted by applicable law, any and
all right to trial by jury in any legal proceeding arising out of or relating to
this Agreement or the transactions contemplated hereby. If either party shall
commence a Proceeding to enforce any provisions of a Transaction Document, then
the prevailing party in such Proceeding shall be reimbursed by the other party
for its reasonable attorneys fees and other costs and expenses incurred with the
investigation, preparation and prosecution of such Proceeding.

            (k) Cumulative Remedies. The remedies provided herein are cumulative
and not exclusive of any remedies provided by law.

            (l) Severability. If any term, provision, covenant or restriction of
this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their reasonable efforts to find and employ an alternative
means to achieve the same or substantially the same result as that contemplated
by such term, provision, covenant or restriction. It is hereby stipulated and
declared to be the intention of the parties that they would have executed the
remaining terms, provisions, covenants and restrictions without including any of
such that may be hereafter declared invalid, illegal, void or unenforceable.

            (m) Headings. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       10
<PAGE>

      IN WITNESS WHEREOF, the parties have executed this Registration Rights
Agreement as of the date first written above.

COMPANY:

OMNI Energy Services Corp.

By: /s/ G. Darcy Klug
    -----------------------------
Name: G. Darcy Klug
Title: Executive Vice President

HOLDERS:

The Dennis R. Sciotto Family Trust Dated    Edward E. Colson, III Trust dated
December 19, 1994                           January 2, 1995

By: /s/ Dennis R. Sciotto                   By: /s/ Edward E. Colson
    ---------------------                       ---------------------
Name: Dennis R. Sciotto                     Name: Edward E. Colson
Its: ____________________                   Its: ____________________

By: /s/ Jimit Mehta                         By: /s/ James C. Eckert
    ---------------------                       ---------------------
    Jimit Mehta                                 James C. Eckert

By: /s/ G. Darcy Klug
    ------------------
    G. Darcy Klug

                                       11<PAGE>

                       2005 REGISTRATION RIGHTS AGREEMENT
                     (PORTSIDE GROWTH AND OPPORTUNITY FUND)

         This 2005 REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of
May 17, 2005, by and between OMNI ENERGY SERVICES CORP., a Louisiana corporation
(the "Company"), and PORTSIDE GROWTH AND OPPORTUNITY FUND ("Investor").

         On February 12, 2004 and April 15, 2004, the Company issued and sold
Warrants to one or more of the Investors Warrants (the "Warrants").

         The Warrants are exercisable into shares (the "Warrant Shares") of the
Company's common stock, par value $0.01 per share (the "Common Stock"), in
accordance with their terms.

         Concurrently with the execution of this Agreement, the Company has
issued (i) 500,000 shares of Common Stock to the Investor pursuant to the
conversion of certain 6.5% Convertible Debentures issued and sold to the
Investor by the Company (the "Debentures"), and (ii) a Subordinated Promissory
Note in the original principal amount of $1,074,080.09 (the "Subordinated Note")
which permits the Company, in certain events, to issue shares (the "Debt Service
Shares") of Common Stock to the Investor in the event that the Company's senior
credit facilities prohibit the cash payment of quarterly principal and interest
payments on the Subordinated Note.

         The Company has agreed to provide certain registration rights under the
Securities Act of 1933, as amended (the "Securities Act"), and under applicable
state securities laws.

         In consideration of the premises, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties agree as follows:

1.       DEFINITIONS.

         For purposes of this Agreement, the following terms shall have the
meanings specified:

                  (a) "Average VWAP" means the average of the daily VWAP for
         each of the five (5) Trading Days occurring immediately before a
         specified date.

                  (b) "Debenture Shares" means the shares of Common Stock issued
         to the Investor on the date of this Agreement upon conversion of
         certain of the Debentures;

                  (c) "Effective Date" means the date on which the Registration
         Statement is declared effective by the Securities and Exchange
         Commission (the "Commission");

                  (d) "Filing Deadline" means the ninieth (90th) calendar day
         following the date of this Agreement;

                  (e) "Holder" means any person owning Debenture Shares or
         owning or having the right to acquire, through exercise of the
         Warrants, Registrable Securities, including initially the Investor and
         thereafter any permitted assignee thereof;

<PAGE>

                  (f) "Registrable Securities" means the Debenture Shares, the
         Warrant Shares, the Debt Service Shares and any shares of capital stock
         issued or issuable from time to time (with any adjustments) in
         replacement of, in exchange for or otherwise in respect of the
         Debenture Shares, the Warrant Shares or the Debt Service Shares;

                  (g) "Registration Deadline" means the one hundred and
         eightieth (180th) calendar day following the date of this Agreement;

                  (h) "Registration Period" has the meaning set forth in
         Paragraph 2(b) below;

                  (i) "Registration Statement" means any registration statement
         described in paragraph 2 or 3 below relating to the resales of the
         Registrable Securities; and

                  (j) "Settlement Agreement" means the Settlement Agreement and
         Mutual Release of even date herewith entered into between the Company
         and the Investor;

                  (k) "Trading Day" means any day on which the Common Stock is
         purchased or sold on the principal securities exchange or market on
         which the Common Stock is then listed or traded; and

                  (l) "VWAP" on a Trading Day means the volume weighted average
         price Common Stock for such Trading Day as reported by Bloomberg
         Financial Markets or if Bloomberg Financial Markets is not then
         reporting such prices, by a comparable reporting service of national
         reputation selected by Holder and reasonably satisfactory to the
         Company.

2.       REGISTRATION.

                  (a) Registration Statement. On or before the Filing Deadline,
the Company shall prepare and file with the Commission a Registration Statement
on Form S-1 as a "shelf" registration statement under Rule 415 under the
Securities Act ("Rule 415") covering the resale of a number of shares of
Registrable Securities equal to (i) the 500,000 Debenture Shares, (ii) one
hundred percent (100%) of the number of shares of Common Stock issuable on the
date of this Agreement pursuant to the Exercise Price in effect on such date and
without regard to any restriction on the ability of any Holder to exercise such
Holder's Warrant as of such date, and (iii) one hundred percent (100%) of the
number of Debt Service Shares issuable on the date of filing of the Registration
Statement (such number to be determined using the average of the daily VWAP for
each of the five (5) Trading Days ending one business day prior to the date of
filing of the Registration Statement). The Registration Statement shall state,
to the extent permitted by Rule 416 under the Securities Act, that it also
covers such indeterminate number of additional shares of Common Stock as may
become issuable in the event the Company is required to issue Debt Service
Shares and upon and exercise of the Warrants or in order to prevent dilution
resulting from stock splits, stock dividends or similar events.

                  (b) Effectiveness. The Company shall use its best efforts to
cause the Registration Statement to become effective prior to the Registration
Deadline. The Company shall respond promptly to any and all comments made by the
staff of the Commission on the Registration Statement, and shall submit to the
Commission, within two (2) Business Days after

                                       2

<PAGE>

the Company learns that no review of the Registration Statement will be made by
the staff of the Commission or that the staff of the Commission has no further
comments on the Registration Statement, as the case may be, a request for
acceleration of the effectiveness of the Registration Statement to a time and
date not later than forty-eight (48) hours after the submission of such request.
The Company will maintain the effectiveness of the Registration Statement until
the earlier to occur of (i) the date on which all of the Registrable Securities
eligible for resale thereunder have been publicly sold pursuant to either the
Registration Statement or Rule 144 and (ii) the date on which all of the
Registrable Securities remaining to be sold under the Registration Statement (in
the reasonable opinion of counsel to the Holder) may be immediately sold to the
public under Rule 144(k) or any successor provision, assuming that all Warrant
Shares are issued by means of a cashless exercise of the Warrants (the period
beginning on the Closing Date and ending on the earlier to occur of (i) or (ii)
above being referred to herein as the "Registration Period").

                  (c) Registration Default. If (A) the Registration Statement is
not filed on or before the Filing Deadline or declared effective by the
Commission on or before the Registration Deadline, (B) after the Registration
Statement has been declared effective by the Commission and during a period in
which an Allowed Delay (as hereinafter defined) is not in effect, sales of
Registrable Securities cannot be made by a Holder under the Registration
Statement for any reason not within the exclusive control of such Holder (other
than such Registrable Securities as are then freely saleable pursuant to Rule
144(k)), or (C) an amendment to the Registration Statement, or a new
registration statement, required to be filed pursuant to the terms of paragraph
4(k) below is not filed on or before the date required by such paragraph (each
of (A), (B) and (C) being referred to herein as a "Registration Default"), and
such Registration Default, (i) in the case of a Registration Default described
in clause (A), occurs or is continuing after seven (7) business days following
delivery of a written notice of the Registration Deadline by Investor at any
time after the date that is thirty (30) days prior to the Registration Deadline,
or (ii) in the case of a Registration Default described in clause (B), or clause
(C), continues for seven (7) business days following delivery of a written
notice of such default by the Investor to the Company, the Company shall make
payments to each Holder equal to one and one-half percent (1.5%) of the
aggregate amount of principal and interest outstanding on the Debentures then
held by such Holder for each thirty (30) day period in which a Registration
Default occurs (prorated for any period of less than thirty days). Each such
payment shall be made within five (5) Business Days following the last day of
the calendar month in which a Registration Default occurs. Any such payment
shall be in addition to any other remedies available to each Holder at law or in
equity, whether pursuant to the terms hereof, the Securities Purchase Agreement,
or otherwise.

                  (d) Allowed Delay. The Company may delay the disclosure of
material non-public information, and suspend the availability of the
Registration Statement, for no more than (i) ten (10) consecutive Business Days
or (ii) thirty (30) calendar days in any twelve (12) month period, in the event
of a proposed merger, reorganization or similar transaction involving the
Company, as long as its board of directors (A) has determined, upon the advice
of counsel, that such information would be required to be disclosed in an
offering registered under the Securities Act and (B) reasonably deems it in the
Company's best interests not to disclose such information publicly (an "Allowed
Delay"). The Company shall promptly (i) notify each Holder in writing of the
existence of material non-public information giving rise to an Allowed Delay
(but in no event, without the prior written consent of such Holder, shall the
Company disclose to such

                                       3

<PAGE>

Holder any of the facts or circumstances regarding any material non-public
information), (ii) advise each Holder in writing to cease all sales under the
Registration Statement until the termination of the Allowed Delay and (iii)
notify each Holder in writing immediately upon the termination or expiration of
an Allowed Delay.

                  (e) Allocation of Debt Service Shares and Warrant Shares. The
initial number of Debt Service Shares and Warrant Shares included in any
Registration Statement and each increase in the number thereof included therein
shall be allocated pro rata among the Holders based on the aggregate number of
Registrable Securities issuable to each Holder at the time the Registration
Statement covering such initial number of Registrable Securities or increase
thereof is declared effective by the Commission (such number to be determined
using the Average VWAP or Exercise Price, as applicable, in effect at such time
and without regard to any restriction on the ability of a Holder to exercise
such Holder's Warrant as of such date). In the event that a Holder sells or
otherwise transfers any of such Holder's Registrable Securities, each transferee
shall be allocated the portion of the then remaining number of Registrable
Securities included in such Registration Statement allocable to the transferor.

                  (f) Registration of Other Securities. During the period
beginning on the date hereof and ending on the Effective Date, the Company shall
refrain from filing any registration statement (other than (i) the Registration
Statement or (ii) a registration statement on Form S-8 with respect to stock
option plans and stock plans currently in effect).

3.       PIGGYBACK REGISTRATION.

         If at any time during the term of this Agreement, (i) the Company
proposes to register shares of Common Stock under the Securities Act in
connection with the public offering of such shares for cash (a "Proposed
Registration") other than a registration statement on Form S-8 or any successor
or other forms promulgated for similar purposes and (ii) a Registration
Statement covering the sale of all of the Registrable Securities is not then
effective and available for sales thereof by the Holders, the Company shall, at
such time, promptly give each Holder written notice of such Proposed
Registration. Each Holder shall have ten (10) Business Days from its receipt of
such notice to deliver to the Company a written request specifying the amount of
Registrable Securities that such Holder intends to sell and such Holder's
intended method of distribution. Upon receipt of such request, the Company shall
use its best efforts to cause all Registrable Securities which the Company has
been requested to register to be registered under the Securities Act to the
extent necessary to permit their sale or other disposition in accordance with
the intended methods of distribution specified in the request of such Holder;
provided, however, that the Company shall have the right to postpone, withdraw
or delay any registration effected pursuant to this Section 3 without obligation
to the Holder. If, in connection with any underwritten public offering for the
account of the Company or for stockholders of the Company that have contractual
rights to require the Company to register shares of Common Stock, the managing
underwriter(s) thereof shall impose a limitation on the number of shares of
Common Stock which may be included in a registration statement because, in the
judgment of such underwriter(s), marketing or other factors dictate such
limitation is necessary to facilitate such offering, then the Company shall be
obligated to include in the registration statement only such limited portion of
the Registrable Securities with respect to which each Holder has requested
inclusion hereunder as such underwriter(s) shall permit. Any exclusion of
Registrable Securities

                                       4

<PAGE>

shall be made pro rata among the Holders seeking to include Registrable
Securities in a registration statement, in proportion to the number of
Registrable Securities sought to be included by such Holders; provided, however,
that the Company shall not exclude any Registrable Securities unless the Company
has first excluded all outstanding securities, the holders of which are not
entitled to inclusion of such securities in the registration statement or are
not entitled to pro rata inclusion with the Registrable Securities; and
provided, further, that, after giving effect to the immediately preceding
proviso, any exclusion of Registrable Securities shall be made pro rata with
holders of other securities having the right to include such securities in the
registration statement.

4.       OBLIGATIONS OF THE COMPANY.

         Whenever required under Section 2 to effect the registration of any
Registrable Securities, the Company shall, as expeditiously as possible:

                  (a) prepare and file with the Commission such amendments and
supplements to the Registration Statement and the prospectus used in connection
with the Registration Statement as may be necessary to comply with the
provisions of the Securities Act, or as may be reasonably requested by a Holder
in order to incorporate information concerning such Holder or such Holder's
intended method of distribution;

                  (b) as soon as practicable following the date of this
Agreement, secure the listing of all Registrable Securities on the Nasdaq
National Market System, and provide each Holder with reasonable evidence
thereof;

                  (c) upon the effectiveness of the Registration Statement,
furnish to each Holder such number of copies of the prospectus included in the
Registration Statement, including a preliminary prospectus, in conformity with
the requirements of the Securities Act, and such other documents as such Holder
may reasonably request in order to facilitate the disposition of such Holder's
Registrable Securities;

                  (d) use all commercially reasonable efforts to register or
qualify the Registrable Securities under the securities or "blue sky" laws of
such jurisdictions within the United States as shall be reasonably requested in
writing from time to time by a Holder, and do any and all other acts or things
which may be necessary or advisable to enable such Holder to consummate the
public sale or other disposition of the Registrable Securities in such
jurisdictions; provided that the Company shall not be required in connection
therewith or as a condition thereto to qualify to do business, to subject itself
to taxation in any such jurisdiction or to file a general consent to service of
process in any such jurisdiction;

                  (e) in the event of an underwritten public offering of the
Registrable Securities, enter into (together with all Holders proposing to
distribute Registrable Securities through such underwriting) and perform its
obligations under an underwriting agreement, in usual and customary form
reasonably acceptable to the Company, with the managing underwriter of such
offering;

                  (f) notify each Holder immediately after becoming aware of the
occurrence of any event (but shall not, without the prior written consent of
such Holder, disclose to such

                                       5

<PAGE>

Holder any facts or circumstances constituting material non-public information)
as a result of which the prospectus included in the Registration Statement, as
then in effect, contains an untrue statement of material fact or omits to state
a material fact required to be stated therein or necessary to make the
statements therein not misleading in light of the circumstances then existing,
and (except during an Allowed Delay) as promptly as practicable prepare, file
with the Commission and furnish to each Holder a reasonable number of copies of
a supplement or an amendment to such prospectus as may be necessary so that such
prospectus does not contain an untrue statement of material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein not misleading in light of the circumstances then existing;

                  (g) use all commercially reasonable efforts to prevent the
issuance of any stop order or other order suspending the effectiveness of the
Registration Statement and, if such an order is issued, to obtain the withdrawal
thereof at the earliest possible time and to notify each Holder of the issuance
of such order and the resolution thereof; and

                  (h) provide to each Holder and its representatives, upon
reasonable prior notice, the opportunity to conduct a reasonable inquiry of the
Company's financial and other records during normal business hours and make
available its officers for questions regarding information which such Holder may
reasonably request in order to fulfill any due diligence obligation on its part;

                  (i) furnish to each Holder, on the date that the Registration
Statement, or any successor registration statement, becomes effective, (x) a
letter, dated such date, of outside counsel representing the Company (and
reasonably acceptable to such Holder) addressed to such Holder, confirming such
effectiveness and, to the knowledge of such counsel, the absence of any stop
order, and (y) in the case of an underwriting (or if the Commission deems such
Holder as an underwriter for disclosure purposes), (A) a copy of an opinion,
dated such date, of such outside counsel, in such form and substance as is
required to be given to the underwriters, and (B) a letter addressed to such
Holder, dated such date, from the Company's independent certified public
accountants, in such form and substance as is required to be given by the
Company's independent certified public accountants to such underwriters;

                  (j) permit counsel for each Holder to review the Registration
Statement and all amendments and supplements thereto, and any comments made by
the staff of the Commission concerning such Holder or the transactions
contemplated by the Settlement Agreement between the Company and such Holder and
the Company's responses thereto, within a reasonable period of time (but in no
event less than three (3) Business Days after such Holder has received such
documents) prior to the filing thereof with the Commission (or, in the case of
comments made by the staff of the Commission, within a reasonable period of time
following the receipt thereof by the Company); and

                  (k) in the event that, at any time, the number of shares
available under the Registration Statement is insufficient to cover one hundred
percent (100%) of the Registrable Securities issuable under the Subordinated
Note and the Warrants (such number to be determined using the Average VWAP or
Exercise Price, as applicable, in effect at such time and without regard to any
restriction on the ability of any Holder to exercise such Holder's Warrants) the

                                       6

<PAGE>

Company shall promptly amend the Registration Statement or file a new
registration statement, in any event as soon as practicable, but not later than
the tenth business (10th) day following notice from a Holder of the occurrence
of such event, so that the Registration Statement or such new registration
statement, or both, covers no less than one hundred percent (100%) of the
Registrable Securities eligible for resale thereunder and issuable under the
Subordinated Note and Warrants (such number to be determined using the VWAP or
Exercise Price, as applicable, in effect at the time of such amendment or filing
and without regard to any restriction on the ability of any Holder to exercise
such Holder's Warrant). The Company shall sue its best efforts to cause such
amendment and/or new Registration Statement to become effective as soon as
practicable following the filing thereof. Any Registration Statement filed
pursuant to this paragraph 4(k) shall state that, to the extent permitted by
Rule 416 under the Securities Act, such Registration Statement also covers such
indeterminate number of additional shares of Common Stock as may become issuable
upon exercise of the Warrants in order to prevent dilution resulting from stock
splits, stock dividends or similar events. Unless and until such amendment or
new Registration Statement becomes effective, each Holder shall have the rights
described in Section 2(c) above.

5.       OBLIGATIONS OF EACH HOLDER.

         In connection with the registration of Registrable Securities pursuant
to a Registration Statement, each Holder shall:

                  (a) timely furnish to the Company in writing such information
regarding itself and the intended method of disposition of such Registrable
Securities as the Company shall reasonably request in order to effect the
registration thereof;

                  (b) upon receipt of any notice from the Company of the
happening of any event of the kind described in paragraphs 4(f) or 4(g),
immediately discontinue any sale or other disposition of such Registrable
Securities pursuant to such Registration Statement until the filing of an
amendment or supplement as described in paragraph 4(f) or withdrawal of the stop
order referred to in paragraph 4(g), and use commercially reasonable efforts to
maintain the confidentiality of such notice and its contents;

                  (c) in the event of an underwritten offering of such
Registrable Securities in which such Holder participates, enter into a customary
and reasonable underwriting agreement and execute such other documents as the
Company and the managing underwriter for such offering may reasonably request;

                  (d) to the extent required by applicable law, deliver a
prospectus to the purchaser of such Registrable Securities;

                  (e) notify the Company when it has sold all of the Registrable
Securities held by it; and

                  (f) notify the Company in the event that any information
supplied by such Holder in writing for inclusion in such Registration Statement
or related prospectus is untrue or omits to state a material fact required to be
stated therein or necessary to make such information

                                       7

<PAGE>

not misleading in light of the circumstances then existing; immediately
discontinue any sale or other disposition of such Registrable Securities
pursuant to such Registration Statement until the filing of an amendment or
supplement to such prospectus as may be necessary so that such prospectus does
not contain an untrue statement of material fact or omit to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing; and use commercially
reasonable efforts to assist the Company as may be appropriate to make such
amendment or supplement effective for such purpose.

6.       INDEMNIFICATION.

         In the event that any Registrable Securities are included in a
Registration Statement under this Agreement:

                  (a) To the extent permitted by law, the Company shall
indemnify and hold harmless each Holder, the officers, directors, managers,
shareholders, partners, members, employees, agents and representatives of such
Holder, and each person, if any, who controls such Holder within the meaning of
the Securities Act or the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), against any losses, claims, damages, liabilities or reasonable
out-of-pocket expenses (whether joint or several) (collectively, including legal
or other expenses reasonably incurred in connection with investigating or
defending same, "Losses"), insofar as any such Losses arise out of or are based
upon (i) any untrue statement or alleged untrue statement of a material fact
contained in such Registration Statement, including any preliminary prospectus
or final prospectus contained therein or any amendments or supplements thereto,
or (ii) the omission or alleged omission to state therein a material fact
required to be stated therein, or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading. Subject
to the provisions of paragraph 6(c) below, the Company will reimburse such
Holder, and each such officer, director, employee, agent, representative or
controlling person, for any legal or other out-of-pocket expenses as reasonably
incurred by any such entity or person in connection with investigating or
defending any Loss; provided, however, that the foregoing indemnity shall not
apply to amounts paid in settlement of any Loss if such settlement is effected
without the consent of the Company (which consent shall not be unreasonably
withheld), nor shall the Company be obligated to indemnify any person for any
Loss to the extent that such Loss is (i) based upon and is in conformity with
written information furnished by such person expressly for use in such
Registration Statement or (ii) based on a failure of such person to deliver or
cause to be delivered the final prospectus contained in the Registration
Statement and made available by the Company, if such delivery is required by
applicable law.

                  (b) To the extent permitted by law, each Holder who is named
in such Registration Statement as a selling stockholder, acting severally and
not jointly, shall indemnify and hold harmless the Company, the officers,
directors, employees, agents and representatives of the Company, and each
person, if any, who controls the Company within the meaning of the Securities
Act or the Exchange Act, against any Losses to the extent (and only to the
extent) that any such Losses are based upon and in conformity with written
information furnished by such Holder expressly for use in such Registration
Statement. Subject to the provisions of paragraph 6(c) below, such Holder will
reimburse any legal or other expenses as reasonably incurred by the

                                       8

<PAGE>

Company and any such officer, director, employee, agent, representative, or
controlling person, in connection with investigating or defending any such Loss;
provided, however, that the foregoing indemnity shall not apply to amounts paid
in settlement of any such Loss if such settlement is effected without the
consent of such Holder (which consent shall not be unreasonably withheld); and
provided, further, that, in no event shall any indemnity under this subsection
6(b) exceed the net proceeds resulting from the sale of the Registrable
Securities sold by such Holder under such Registration Statement.

                  (c) Promptly after receipt by an indemnified party under this
Section 6 of notice of the commencement of any action (including any
governmental action), such indemnified party will, if a claim in respect thereof
is to be made against any indemnifying party under this Section 6, deliver to
the indemnifying party a written notice of the commencement thereof and the
indemnifying party shall have the right to participate in and to assume the
defense thereof with counsel mutually satisfactory to the parties; provided,
however, that an indemnified party shall have the right to retain its own
counsel, with the reasonably incurred fees and expenses of one such counsel for
all indemnified parties to be paid by the indemnifying party, if representation
of such indemnified party by the counsel retained by the indemnifying party
would be inappropriate under applicable standards of professional conduct due to
actual or potential conflicting interests between such indemnified party and any
other party represented by such counsel in such proceeding. The failure to
deliver written notice to the indemnifying party within a reasonable time of the
commencement of any such action, to the extent prejudicial to its ability to
defend such action, shall relieve such indemnifying party of any liability to
the indemnified party under this Section 6 with respect to such action, but the
omission so to deliver written notice to the indemnifying party will not relieve
it of any liability that it may have to any indemnified party otherwise than
under this Section 6 or with respect to any other action unless the indemnifying
party is materially prejudiced as a result of not receiving such notice.

                  (d) In the event that the indemnity provided in paragraph (a)
or (b) of this Section 6 is unavailable or insufficient to hold harmless an
indemnified party for any reason, the Company and each Holder agree, severally
and not jointly, to contribute to the aggregate Losses to which the Company or
such Holder may be subject in such proportion as is appropriate to reflect the
relative fault of the Company and such Holder in connection with the statements
or omissions which resulted in such Losses; provided, however, that in no case
shall such Holder be responsible for any amount in excess of the net proceeds
resulting from the sale of the Registrable Securities sold by it under the
Registration Statement. Relative fault shall be determined by reference to
whether any alleged untrue statement or omission relates to information provided
by the Company or by such Holder. The Company and each Holder agree that it
would not be just and equitable if contribution were determined by pro rata
allocation or any other method of allocation which does not take account of the
equitable considerations referred to above. Notwithstanding the provisions of
this paragraph (d), no person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to
contribution from any person who is not guilty of such fraudulent
misrepresentation. For purposes of this Section 6, each person who controls a
Holder within the meaning of either the Securities Act or the Exchange Act and
each officer, director, employee, agent or representative of such Holder shall
have the same rights to contribution as such Holder, and each person who
controls the Company within the meaning of either the Securities Act or the
Exchange Act and each officer, director, employee, agent or representative of
the Company shall

                                       9

<PAGE>

have the same rights to contribution as the Company, subject in each case to the
applicable terms and conditions of this paragraph (d).

                  (e) The obligations of the Company and each Holder under this
Section 6 shall survive the payment of the Subordinated Note and exercise of the
Warrants in full, the completion of any offering or sale of Registrable
Securities pursuant to a Registration Statement under this Agreement, or
otherwise.

7.       REPORTS.

         With a view to making available to each Holder the benefits of Rule 144
under the Securities Act ("Rule 144") and any other similar rule or regulation
of the Commission that may at any time permit such Holder to sell securities of
the Company to the public without registration, the Company agrees to:

                  (a) make and keep public information available, as those terms
are understood and defined in Rule 144;

                  (b) use its best efforts to file with the Commission in a
timely manner all reports and other documents required of the Company under the
Securities Act and the Exchange Act; and

                  (c) furnish to such Holder, so long as such Holder owns any
Registrable Securities, promptly upon written request (i) a written statement by
the Company, if true, that it has complied with the reporting requirements of
Rule 144, the Securities Act and the Exchange Act, (ii) to the extent not
publicly available through the Commission's EDGAR database, a copy of the most
recent annual or quarterly report of the Company and such other reports and
documents so filed by the Company, and (iii) such other information as may be
reasonably requested by such Holder in connection with such Holder's compliance
with any rule or regulation of the Commission which permits the selling of any
such securities without registration.

8.       TERMINATION.

         This Agreement shall terminate with respect to any Holder on the
earlier to occur of (i) the date on which all of the Registrable Securities
eligible for resale have been publicly sold pursuant to either the Registration
Statement or Rule 144 and (ii) the date on which all of the Registrable
Securities may be immediately sold to the public under Rule 144(k) or any
successor provision.

9.       MISCELLANEOUS.

                  (a) Expenses of Registration. All reasonable expenses, other
than underwriting discounts and commissions and fees and expenses of counsel and
other advisors to each Holder, incurred in connection with the registrations,
filings or qualifications described herein, including (without limitation) all
registration, filing and qualification fees, printers' and accounting fees, the
fees and disbursements of counsel for the Company, and the fees and

                                       10

<PAGE>

disbursements incurred in connection with the opinion and letter described in
paragraph 4(i) hereof, shall be borne by the Company.

                  (b) Amendment; Waiver. Except as expressly provided herein,
neither this Agreement nor any term hereof may be amended or waived except
pursuant to a written instrument executed by the Company and the Holders of at
least two-thirds (2/3) of the Registrable Securities then outstanding and into
which all of the Warrants then outstanding are convertible or exercisable
(without regard to any limitation on such conversion or exercise). Any amendment
or waiver effected in accordance with this paragraph shall be binding upon each
Holder, each future Holder and the Company.

                  (c) Notices. Any notice, demand or request required or
permitted to be given by the Company or an Investor pursuant to the terms of
this Agreement shall be in writing and shall be deemed delivered (i) when
delivered personally or by verifiable facsimile transmission, unless such
delivery is made on a day that is not a Business Day, in which case such
delivery will be deemed to be made on the next succeeding Business Day, (ii) on
the next Business Day after timely delivery to an overnight courier and (iii) on
the Business Day actually received if deposited in the U.S. mail (certified or
registered mail, return receipt requested, postage prepaid), addressed as
follows:

                  If to the Company:

                           OMNI Energy Services Corp.
                           4500 NE Evangeline Thruway
                           Carencro, LA 70520
                           Attn:  James C. Eckert
                           Tel: (337) 896-6664
                           Fax: (337) 896-6655

                  with a copy to:

                           Locke Liddell & Sapp LLP
                           600 Travis, Suite 3200
                           Houston, TX 77002
                           Attn:  David F. Taylor
                           Tel:  (713) 226-1496
                           Fax:  (713) 223-3717

and if to a Holder, to such address as shall be designated by such Holder in
writing to the Company.

                  (d) Assignment. Upon the transfer of any Warrants or
Registrable Securities by a Holder, the rights of such Holder hereunder with
respect to such securities so transferred shall be assigned automatically to the
transferee thereof, and such transferee shall thereupon be deemed to be a
"Holder" for purposes of this Agreement, as long as: (i) the Company is, within
a reasonable period of time following such transfer, furnished with written
notice of the name and address of such transferee, and (ii) the transferee
agrees in writing with the Company to be

                                       11

<PAGE>

bound by all of the provisions hereof; provided, however, that the registration
rights granted in this Agreement shall not be transferred to any person or
entity that receives any Warrants or Registrable Securities in a public
transaction pursuant to an effective registration statement under the Securities
Act or pursuant to Rule 144.

                  (e) Counterparts. This Agreement may be executed in
counterparts, each of which shall be deemed an original, and all of which
together shall be deemed one and the same instrument. This Agreement, once
executed by a party, may be delivered to any other party hereto by facsimile
transmission.

                  (f) Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of the State of New York applicable to
contracts made and to be performed entirely within the State of New York.

                  (g) Holder of Record. A person is deemed to be a Holder
whenever such person owns or is deemed to own of record such Registrable
Securities. If the Company receives conflicting instructions, notices or
elections from two or more persons with respect to the same Registrable
Securities, the Company shall act upon the basis of instructions, notice or
election received from the record owner of such Registrable Securities.

                  (h) Entire Agreement. This Agreement, the Settlement Agreement
and the Warrants constitute the entire agreement among the parties hereto with
respect to the subject matter hereof and thereof. There are no restrictions,
promises, warranties or undertakings, other than those set forth or referred to
herein and therein. This Agreement, the Settlement Agreement and the Warrants
supersede all prior agreements and understandings among the parties hereto with
respect to the subject matter hereof and thereof.

                  (i) Headings. The headings in this Agreement are for
convenience of reference only and shall not limit or otherwise affect the
meaning hereof.

                  (j) Third Party Beneficiaries. This Agreement is intended for
the benefit of the parties hereto and their respective permitted successors and
assigns, and is not for the benefit of, nor may any provision hereof be enforced
by, any other person.

                  (k) Independent Nature of Holders' Obligations and Rights. The
obligations of each Holder hereunder are several and not joint with the
obligations of any other Holder, and no provision of this Agreement is intended
to confer any obligations on any Holder vis-a-vis any other Holder. The Company
acknowledges that nothing contained herein, and no action taken by any Holder
pursuant hereto, shall be deemed to constitute the Holders as a partnership, an
association, a joint venture or any other kind of entity, or create a
presumption that the Holders are in any way acting in concert or as a group with
respect to such obligations or the transactions contemplated herein.

                                       12

<PAGE>

         IN WITNESS WHEREOF, the undersigned have executed this Agreement as of
the date first-above written.

OMNI ENERGY SERVICES CORP.

By:    /s/ G. Darcy Klug
    -----------------------------------------
       G. Darcy Klug
       Executive Vice President

PORTSIDE GROWTH AND OPPORTUNITY FUND

By:    /s/ Jeff Smith
    -----------------------------------------
Name:  Jeff Smith
Title: Authorized Signatory

                                       13

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