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BULLDAWG PROSPECT

BULLDAWG PROSPECT. Liberty County, Texas.

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BULLDAWG PROSPECT

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  1. BULLDAWGPROSPECT Liberty County, Texas

  2. HOUSTON, Oct. 5, 2005 PRNewswire-First Call -- Carrizo Oil & Gas, Inc. (Nasdaq: CRZO) announced today that the Galloway #1 well in Liberty County, Texas has been successfully drilled and completed, and was put on line on September 30th. Logs indicated 64 feet of apparent net pay in the Cook Mountain sand. The Galloway #1 has tested at estimated rates of up to 13,100 MCF of natural gas and 320 barrels of oil (15,020 MCFE) per day with a flowing tubing pressure of 9,897 psi. The Galloway #1 is currently producing to sales at a constrained rate of approximately 10,100 MCF of natural gas and 240 barrels of oil (11,540 MCFE) per day. GALLOWAY #1

  3. GALLOWAY #2 DENVER, July 25, 2006 /PRNewswire-FirstCall via COMTEX News Network/ -- Cimarex Energy Co. (NYSE: XEC) Galloway Gas Unit #2 (50% working interest) commenced production in July and is currently producing gas of 9.4 MMcf/d and oil of 1,200 barrels per day (16.6 MMcfe/d).

  4. DOBERMAN PROJECT HOUSTON, May 18 PRNewswire-First Call/ -- Carrizo Oil & Gas, Inc. (Nasdaq: CRZO) In Liberty County, Texas, the Company-operated Doberman prospect is producing at 11.2 MMCFE/d from Yegua sands at 13,000 feet. Carrizo generated the prospect and has a 71 percent working interest.

  5. IPF: 9287 MCFPD; 188.4 BOPD • Avg. Daily Prod: 8219 MCFPD; 166 BOPD • Max avg. for a month: 10,424 MCFPD; 217 BOPD • Current Cum: 180,384 BO; 8.8 BCF • ROI To Date 400% + tax benefits

  6. LOWER NOD BULLDAWG PROSPECT UPPER and LOWER NOD MEX GALLOWAY GU2 BULLDOG-1 X = 3767733 Y = 131078 350’ RADIUS +/- 14,790’ 32 ACRES BULLDOG-2 X = 3769363 Y = 132132 350’ RADIUS +/- 14,715’ 42 ACRES 20-30 UPPER NOD Cumulative (since 1970)1,156 MMCF; 21,103 BO X = 3769363 Y = 132323 350’ RADIUS 14,140’ +/- Cumulative (since 1970)968 MMCF; 22,069 BO 95 ACRE (MAX) GALLOWAY GU1 20-30 CARRIZO – DOBERMAN SHALLOW NOD-MEX PACKAGE CIMAREX GALLOWAY GU1 CHOICE – BULLDOG SHALLOW (lower section) NOD-MEX PACKAGE Cumulative (since 1970)356 MMCF; 19,841 BO Cumulative (since 1970)134,986 BO; 1,317 MMCF Cumulative (since 1970)3,997 MMCF; 73,967 BO

  7. FORMATION STRUCTURE Upper NOD MEX CRZO 1-Doberman GU Production since 5/07 = 8.5 BCF + 175,000 Barrels 100 Acres Estimated Recovery = 16 BCF + 340,000 Barrels Upper NOD MEX 13,484’ Log Show CRZO 1Galloway 1GU-1 A Upper NOD MEX Bulldawg Location A 95 acres G Lower NOD MEX Field Pay Sand CRZO 1Galloway GU-2 23 acres Produced: 1.1 BCF & 21,100 Barrels Lower NOD MEX Field Pay Sand Bulldawg Location A 32 acres Lower NOD MEX Field Pay Sand Bulldawg Location B 42 acres B F E Lower NOD MEX Field Pay Sand CRZO 1Galloway GU-1 60 acres Produced 4 BCF + 74,000 Barrels Lower NOD MEX Field Pay Sand XEC 1Galloway GU-1 29 acres Produced 1.6 BCF +165,000 Barrels C D

  8. Lower NOD MEX - Field Pay XEC 1-Grammier 20 acres .51 BCF & 21,100 barrels Bulldawg Surface Location B Trinity River C A D Upper NOD MEX CRZO 1-Doberman GU Production since 5/07 = 8.5 BCF + 175,000 Barrels 100 Acres @ 8.5 MMCFD & 150 BOPD Estimated Recovery = 16 BCF + 340,000 Barrels G Lower NOD MEX - Field Pay Location B : 42 acres F E Lower NOD MEX - Field Pay Location A: 32 acres Upper NOD MEX Location A: 95 acres

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