Whiting Petroleum Corporation is an independent oil and gas company. The Company is engaged in exploration, development, acquisition and production of crude oil, NGLs and natural gas in the Rocky Mountains and Permian Basin regions of the United States. The Company's Rocky Mountains operations include assets in the states of Colorado, Montana, North Dakota, Utah and Wyoming. The Company's Permian Basin operations include assets in Texas and New Mexico. The Company's other operations primarily include its assets in Arkansas, Michigan, Oklahoma and Texas. As of December 31, 2014, The Company's estimated proved reserves totaled 780.3 Million Barrels of Oil Equivalent (MMBOE). At December 31, 2014, the Company's probable reserves were estimated to be 399.3 MMBOE and its possible reserves were estimated to be 225.5 MMBOE, for a total of 624.8 MMBOE.