In July 1978, the General Crude Oil and Department of Energy 1 Pleasant Bayou geopressured geothermal test well was spudded near the Chocolate Bayou field, Brazoria County, Texas, on a site identified through regional and detailed geologic, engineering, and environmental studies. The well was expected to find thick, permeable, deltaic sandstone units from the Frio Formation between 13,500 and 16,500 ft (4,050 and 4,950 m) below sea level. Temperature of the gas-saturated brine was predicted to be higher than 300°F (149°C), and formation pressure to range between 10,000 and 13,000 psi (68,950 and 89,635 kPa). The well has been completed and initial testing has begun.

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