Exhibit 23.1

W.D. VON GONTEN & CO.

September 14, 2004

Contango Oil & Gas Company

3700 Buffalo Speedway, Suite 960

Houston, Texas 77098

Re: Contango Oil & Gas Company, 2004 Annual Report on Form 10-K

Gentlemen:

The firm of W.D. Von Gonten & Co. consents to the use of its name and to the use of its report regarding Contango Oil & Gas Company’s Proved Reserves and Future Net Revenue as of July 1, 2004 in Contango’s 2004 Annual Report on Form 10-K.

W.D. Von Gonten & Co. has no interests in Contango Oil & Gas Company or in any affiliated companies or subsidiaries and is not to receive any such interest as payment for such reports and has no director, officer, or employee otherwise connected with Contango Oil & Gas Company. Contango Oil & Gas Company does not employ us on a contingent basis.

Yours very truly,

W.D. VON GONTEN & CO.

/s/ W.D. VON GONTEN

William D. Von Gonten, Jr.

President