Whiting Petroleum Corporation, located in Denver, is engaged in oil and gas property acquisition, exploitation, exploration and production activities primarily in the Rocky Mountain and Gulf Coast regions, and in the mid-United States. The company has field offices located in Arkansas, Colorado, Michigan, North Dakota, Oklahoma and Texas. It employs more than 150 people, including over 10 senior level geoscientists and more than 15 petroleum engineers. It has built a strong asset base through property acquisitions and exploitation activities. It has acquired operated as well as non operated properties that meet or exceed its rate of return criteria. The company sells properties when its senior management feels that the sales price realized will provide an above average rate of return for the property.