Based in Houston, Southwestern Energy is an independent exploration and production company focused on unconventional natural gas in two U.S. shale plays (the Fayetteville and Marcellus) as well as oil and gas formations in Louisiana, Texas, Colorado, and Canada. Southwestern also owns various oil field services and gathering assets. At year-end 2015, Southwestern's proven reserves were 6.2 trillion cubic feet equivalent, with net production of 2.7 bcfe per day. Natural gas represented 92% of production and 95% of reserves.