Energy Information Administration (EIA), Office of Integrated Analysis and Forecasting, computations based on well reports submitted to the American Petroleum Institute. 1997-2000: EIA, U.S. Crude Oil, Natural Gas, and Natural Gas Liquids Reserves, DOE/EIA-0216(77-2000). 2001 and projections: AEO2004 National Energy Modeling System, runs AEO2004.D101703E, LW2004.D101703B, and HW2004. D101703B.