Chesapeake Energy Corporation engages in the acquisition, exploration, and development of properties for the production of oil, natural gas, and natural gas liquids (NGL) from underground reservoirs in the United States. It operates in two segments, Exploration and Production; and Marketing, Gathering, and Compression. The company 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 in Pennsylvania. It also holds interests in liquids-rich resource plays, such as the Eagle Ford Shale in South Texas; the Utica Shale in Ohio; the Anadarko Basin in northwestern Oklahoma; and the stacked pay in the Powder River Basin in Wyoming. The company owns interests in approximately 22,700 oil and natural gas wells. As of December 31, 2016, it had estimated proved reserves of 1.708 billion barrels of oil equivalent. The company also provides oil, natural gas, and NGL marketing services comprising 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, as well as designs, engineers, fabricates, installs, and sells natural gas compression units, accessories, and equipment used in the production, treatment, and processing of oil and natural gas. Chesapeake Energy Corporation was founded in 1989 and is headquartered in Oklahoma City, Oklahoma.