Carrizo Oil & Gas, Inc. 2001 Annual Report   Cover Company Profile Highlights Letter to Shareholders Texas and Louisiana Areas of Interest Montana and Wyoming Areas of Interest Shareholder Information Form 10K Heading Business and Properties Legal Proceedings Submission of Matters to a Vote of Security Holders Executive Officers of the Registrant Market for Registrant's Common Stock Selected Financial Data Managements' Discussion and Analysis Qualitative and Quantitative Disclosures Financial Statements and Supplementary Data Changes in and Disagreements With Accountants Directors and Officers of the Registrant Executive Compensation Security Ownership of Certain Beneficial Owners Certain Relationships and Related Party Transactions Exhibits, Financial Statement Schedules Signatures Report of Independent Public Accountants Consolidated Balance Sheets Consolidated Statements of Operations Consolidated Statements of Shareholders' Equity Consolidated Statements of Cash Flows Notes to Financial Statements Back Cover

†10.11 — Securities Purchase Agreement dated December 15, 1999 among the Company, CB Capital Investors, L.P., Mellon Ventures, L.P., Paul B. Loyd Jr., Douglas A. P. Hamilton and Steven A. Webster (Incorporated herein by reference to Exhibit 99.1 to the Company's Current Report on Form 8-K dated December 15, 1999). †10.12 — Shareholders Agreement dated December 15, 1999 among the Company, CB Capital Investors, L.P., Mellon Ventures, L.P., Paul B. Loyd Jr., Douglas A. P. Hamilton, Steven A. Webster, S.P. Johnson IV, Frank A. Wojtek and DAPHAM Partnership, L.P. (Incorporated herein by reference to Exhibit 99.2 to the Company's Current Report on Form 8-K dated December 15, 1999). †10.13 — Warrant Agreement dated December 15, 1999 among the Company, CB Capital Investors, L.P., Mellon Ventures, L.P., Paul B. Loyd Jr., Douglas A. P. Hamilton and Steven A. Webster (Incorporated herein by reference to Exhibit 99.3 to the Company's Current Report on Form 8-K dated December 15, 1999). †10.14 — Registration Rights Agreement dated December 15, 1999 among the Company, CB Capital Investors, L.P. and Mellon Ventures, L.P. (Incorporated herein by reference to Exhibit 99.4 to the Company's Current Report on Form 8- K dated December 15, 1999). †10.15 — Amended and Restated Registration Rights Agreement dated December 15, 1999 among the Company, Paul B. Loyd Jr., Douglas A. P. Hamilton, Steven A. Webster, S.P. Johnson IV, Frank A. Wojtek and DAPHAM Partnership, L.P. (Incorporated herein by reference to Exhibit 99.5 to the Company's Current Report on Form 8-K dated December 15, 1999). †10.16 — Compliance Sideletter dated December 15, 1999 among the Company, CB Capital Investors, L.P. and Mellon Ventures, L.P. (Incorporated herein by reference to Exhibit 99.6 to the Company's Current Report on Form 8-K dated December 15, 1999). †10.17 — Form of Amendment to Executive Officer Employment Agreement (Incorporated herein by reference to Exhibit 99.7 to the Company's Current Report on Form 8-K dated December 15, 1999). †10.18 — Form of Amendment to Director Indemnification Agreement (Incorporated herein by reference to Exhibit 99.8 to the Company's Current Report on Form 8-K dated December 15, 1999). †10.19 — Purchase and Sale Agreement by and between Rocky Mountain Gas, Inc. and CCBM, Inc., dated June 29, 2001 (Incorporated herein by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2001). †10.20 — Securities Purchase Agreement dated February 20, 2002 among the Company, Mellon Ventures, L.P. and Steven A. Webster (Incorporated herein by reference to Exhibit 99.1 to the Company's Current Report on Form 8-K dated February 20, 2002). †10.21 — Shareholders' Agreement dated February 20, 2002 among the Company, Mellon Ventures, L.P., Paul B. Loyd, Jr., Douglas A.P. Hamilton, Steven A. Webster, S.P. Johnson IV, Frank A. Wojtek and DAPHAM Partnership, L.P. (Incorporated herein by reference to Exhibit 99.3 to the Company's Current Report on Form 8-K dated February 20, 2002). †10.22 — Warrant Agreement dated February 20, 2002 among the Company, Mellon Ventures, L.P. and Steven A. Webster (including Warrant Certificate) (Incorporated herein by reference to Exhibit 99.4 to the Company's Current Report on Form 8-K dated February 20, 2002). †10.23 — Registration Rights Agreement dated February 20, 2002 among the Company, Mellon Ventures, L.P. and Steven A. Webster (Incorporated herein by reference to Exhibit 99.5 to the Company's Current Report on Form 8-K dated February 20, 2002). †10.24 — Compliance Sideletter dated February 20, 2002 between the Company and Mellon Ventures, L.P. (Incorporated herein by reference to Exhibit 99.6 to the Company's Current Report on Form 8-K dated February 20, 2002). †10.25 — Form of Amendment to Executive Officer Employment Agreement (Incorporated herein by reference to Exhibit 99.7 to the Company's Current Report on Form 8-K dated February 20, 2002). †10.26 — Form of Amendment to Director Indemnification Agreement (Incorporated herein by reference to Exhibit 99.8 to the Company's Current Report on Form 8-K dated February 20, 2002). 21.1 — Subsidiaries of the Company. 23.1 — Consent of Arthur Andersen LLP. 23.2 — Consent of Ryder Scott Company Petroleum Engineers. 23.3 — Consent of Fairchild & Wells, Inc. 99.1 — Summary of Reserve Report of Ryder Scott Company Petroleum Engineers as of December 31, 2001. 99.2 — Summary of Reserve Report of Fairchild & Wells, Inc. as of December 31, 2001. 99.3 — Letter to the Securities and Exchange Commission regarding Arthur Andersen LLP. 39