Encore Acquisition Company engages in the acquisition, development, exploitation, exploration, and production of onshore North American oil and natural gas reserves. The company’s oil and natural gas properties primarily concentrated in the Cedar Creek Anticline in the Williston Basin of Montana and North Dakota; the Permian Basin of west Texas and southeastern New Mexico; the Mid-Continent area, which includes the Arkoma and Anadarko Basins of Oklahoma, the North Louisiana Salt Basin, the East Texas Basin, and the Barnett Shale of north Texas; and the Rockies that comprises nonCCA assets in the Williston and Powder River Basins of Montana, as well as the Paradox Basin of southeastern Utah. As of December 31, 2005, its total estimated proved reserves were 148.4 thousand barrels of oil and 283.9 billion cubic feet of natural gas. The company principally sells its products to the end users, marketers, refiners, and other purchasers. Encore Acquisition was founded in 1998 and is based in Fort Worth, Texas.