Kodiak Oil & Gas Corp. and its subsidiaries engage in the exploration, exploitation, development, acquisition, and production of natural gas and crude oil in the western United States. Its oil and natural gas reserves and operations are located in two Rocky Mountain Basins. The company explores for natural gas in the Vermillion Basin of the Green River Basin in Wyoming and Colorado; and in the Williston Basin in Montana and North Dakota. As of December 31, 2007, its total proved developed reserves comprised approximately 623,950 Bbls of crude oil and approximately 2,455,661 Mcf of natural gas. The company also had various lease agreements representing approximately 152,430 gross and 98,162 net acres in the Green River and Williston Basins. Kodiak Oil & Gas Corp. was founded in 1972 and is headquartered in Denver, Colorado.