GeoResources, Inc., an independent oil and gas company, engages in the acquisition, development, production, and exploration of oil and gas reserves in the United States. It produces crude oil, natural gas, and related products primarily in Texas, North Dakota, Louisiana, Oklahoma, Montana, and Colorado. As of December 31, 2009, the company had an estimated 22,120 thousand barrel of oil equivalent of proved reserves. GeoResources is headquartered in Houston, Texas.