SandRidge Energy, Inc. is an independent oil and gas company engaged in the production, development, and acquisition of oil and gas properties. The Company's primary area of operation is the Mid-Continent region in Oklahoma, Texas, and Kansas. The Company sells its oil, natural gas and natural gas liquids (NGLs) to a variety of customers, including oil and natural gas companies and trading and energy marketing companies. It holds interests in approximately 574,599 gross (378,537 net) leasehold acres located primarily in Oklahoma, Kansas, and Texas. Its interests in the Mid-Continent include 1,446 gross (825 net) producing wells with an average working interest of 57.1%. The interests are largely aggregated across the Mississippian Lime, Meramec and Cherokee formations. The Mississippian Lime formation is an expansive carbonate hydrocarbon system located on the Anadarko Shelf in northern Oklahoma and southern Kansas. The Meramec is composed of interbedded shales, sands, and carbonates.