Approach Resources takes a different approach to natural gas and oil exploration, development, and production. Specializing in finding and exploiting unconventional reservoirs, the company operates primarily in West Texas' Ozona Northeast field. It also has operations in western Kentucky and northern New Mexico. The company's unconventional designation results from a focus on developing natural gas reserves in tight gas sands and shale areas, necessitating a reliance on advanced completion, fracturing, and drilling techniques. In 2008 Approach Resources reported proved reserves of 193.7 billion cu. ft. of oil equivalent, with a reserve life index of about 19 years. Yorktown Energy Partners controls the company.