Chesapeake Energy Corporation produces oil and natural gas through acquisition, exploration, and development of from underground reservoirs in the United States. It holds interests in natural gas resource plays, including the Haynesville/Bossier Shales in northwestern Louisiana and East Texas; the Marcellus Shale in the northern Appalachian Basin of West Virginia and Pennsylvania; and the Barnett Shale in the Fort Worth Basin of north-central Texas. The company also holds interests in liquids-rich resource plays, such as the Eagle Ford Shale in South Texas; the Utica Shale in Ohio and Pennsylvania; the Granite Wash/Hogshooter, Cleveland, Tonkawa, and Mississippi Lime plays in the Anadarko Basin in northwestern Oklahoma and the Texas Panhandle; and the Niobrara Shale and Upper Cretaceous sands in the Powder River Basin in Wyoming. It owns interests in approximately 45,100 oil and natural gas wells. As of December 31, 2014, the company had estimated proved reserves of 2.469 billion barrels of oil equivalent. It also provides oil, natural gas, and NGL marketing services, including commodity price structuring, securing and negotiating gathering, hauling, processing and transportation, contract administration, and nomination services for Chesapeake-operated wells; and marketing services for third-party producers. The company was founded in 1989 and is headquartered in Oklahoma City, Oklahoma.