Exhibit 23.3
CAWLEY, GILLESPIE & ASSOCIATES, INC.
PETROLEUM CONSULTANTS
| 9601 AMBERGLEN BLVD., SUITE 117 | 306 WEST SEVENTH STREET, SUITE 302 | 1000 LOUISIANA STREET, SUITE 625 | ||
| AUSTIN, TEXAS 78729-1106 | FORT WORTH, TEXAS 76102-4987 | HOUSTON, TEXAS 77002-5008 | ||
| 512-249-7000 | 817- 336-2461 | 713-651-9944 | ||
| www.cgaus.com |
CONSENT OF INDEPENDENT PETROLEUM ENGINEERS
We hereby consent to the references to our firm in the form and context in which they are included in this amendment to the registration statement on Form S-1 and Form S-3 (including any amendments thereto and the related prospectus) filed by Whiting USA Trust II and Whiting Petroleum Corporation, respectively (collectively, the “Registration Statement”), to our estimates of reserves and value of reserves and our report on reserves as of December 31, 2011 of the underlying properties and net profits interest owned by Whiting USA Trust II and to the inclusion of our report dated December 9, 2011 as an appendix to the prospectus included in the Registration Statement.
We also consent to the references to our firm in the form and context in which they are incorporated by reference in the Registration Statement and the related prospectus that is a part thereof. We hereby further consent to the incorporation by reference of information contained in our report setting forth the estimates of revenues from Whiting Petroleum Corporation’s oil and gas reserves as of December 31, 2011.
We also consent to the references to our firm in the prospectus included in such registration statement, including under the heading “Experts.”
| Sincerely, |
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| Cawley, Gillespie & Associates, Inc. |
| Texas Registered Engineering Firm F-693 |
March 12, 2012
Fort Worth, Texas