Exhibit 31.2

OMNI ENERGY SERVICES CORP.

A LOUISIANA CORPORATION

CERTIFICATION OF CHIEF FINANCIAL OFFICER

SECTION 302 CERTIFICATION

I, Ronald D. Mogel, Senior Vice President and Chief Financial Officer of OMNI Energy Services Corp., certify
that:

1. I have reviewed this quarterly report on Form 10-Q of OMNI Energy Services Corp., a Louisiana corporation (the
registrant);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The
registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13(a)-15(e) and 15d-15(e)) and internal control over financial reporting (as
defined in Exchange Act rules 13(a)-15(f) and 15(d)-15(f)) for the registrant and have:

a) Designed such disclosure
controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others
within those entities, particularly during the period in which this annual report is being prepared;

b) Designed such
internal control over financial reporting, or cause such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of
financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the
effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on
such evaluation; and

d) Disclosed in this report any change in the registrants internal control over financial
reporting that occurred during the registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
registrants internal control over financial reporting; and

5. The registrants other certifying officer and I have disclosed,
based on our most recent evaluation, to the registrants auditors and the audit committee of the registrants board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrants ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal controls over financial reporting.

Date: May 7, 2009



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|/S/ RONALD D. MOGEL                                              
|Ronald D. Mogel Senior Vice President and Chief Financial Officer
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