Carrizo Oil & Gas Inc is engaged in the exploration, development, and production of oil and gas primarily from assets in the United States. The company aims to accumulate significant leasehold positions in areas with known shale thickness and thermal maturity in the proximity of knock or emerging pipeline infrastructures. Carrizo first identifies and acquires surface tracts of well pads from which multiple wells can be drilled. It attempts to acquire contiguous lease blocks in the areas immediately adjacent to the acquired well pads. Horizontal drilling and hydraulic fracturing programs are used to maximize production rate and recoverable reserves from a unit area. The company's products are sold at the wellhead to unaffiliated third parties.