Exhibit 23.6

            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

     We consent to the incorporation by reference in the Registration Statements
on Forms S-8 No. 333-35245, No. 333-55838 and No. 333-116528,  pertaining to the
Incentive  Plan of Carrizo  Oil & Gas,  Inc.,  of our report  dated May 2, 2005,
relating to the effectiveness of Carrizo Oil & Gas, Inc.'s internal control over
financial reporting,  which is included in this Annual Report on Form 10-K/A for
the year ended December 31, 2004.

/s/PANNELL KERR FORSTER OF TEXAS, P.C.
   -----------------------------------
   Pannell Kerr Forster of Texas, P.C.

Houston, Texas
May 2, 2005