Carrizo Oil & Gas, Inc., is an energy company. The Company is actively engaged in the exploration, development, and production of oil and gas primarily from resource plays located in the United States. As of December 31, 2013 the Company�s operations are principally focused in producing oil and gas plays primarily in the Eagle Ford Shale in South Texas, the Niobrara Formation in Colorado, the Marcellus Shale in Pennsylvania, and the Utica Shale in Ohio. The Company�s total production as of 2013 is 10.0 Million Barrels of Oil Equivalent (MMBoe). At year-end 2013, its U.S. reserves of 101.5 MMBoe were 61% crude oil, 8% natural gas liquids and 31% natural gas. . As of December 31, 2013, approximately 29,256 net acres are subject to the Company�s September 2011 joint venture arrangements with GAIL GLOBAL (USA) INC.