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July 30, 2012

Authors: Ariel Esposito and Chad Augustine, NREL

Geopressured geothermal reservoirs are characterized by high temperatures and high pressures with correspondingly large quantities of dissolved methane. Due to these characteristics, the reservoirs provide two sources of energy: chemical energy from the recovered methane and thermal energy from the recovered high temperature fluid. Formations with the greatest potential for recoverable energy are located in the gulf coastal region of Texas and Louisiana. This study estimates the total recoverable onshore geopressured geothermal resource (defined as a brine reservoir with fluid temperature greater than 212°F and a pressure gradient greater than 0.7 psi/ft) for identified sites in Texas and Louisiana.

—Jim Leyshon