Shale Development Drives U.S. Proved Reserves To Highest Level Since 1971

U.S. natural gas proved reserves, estimated as "wet" gas which includes natural gas plant liquids, increased by 11% in 2009 to 284 Tcf, the highest level since 1971, according to the U.S. Energy Information Administration's (EIA) Summary: U.S. Crude Oil, Natural Gas, and Natural Gas Liquids Reserves, 2009.