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Exhibit 23.6

Consent of Independent Registered Public Accounting Firm

The Board of Directors
Dawson Geophysical Company:

We consent to the use of our report dated December 5, 2012, with respect to the consolidated balance sheet of Dawson Geophysical Company as of September 30, 2012, and the related consolidated statements of operations and comprehensive income (loss), stockholders' equity, and cash flows for each of the years in the two-year period ended September 30, 2012, incorporated herein by reference and to the reference to our firm under the heading "Experts" in the prospectus.

/s/ KPMG LLP
Dallas, Texas
November 5, 2014

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Exhibit 23.6

Consent of Independent Registered Public Accounting Firm