From Open Energy Information
|North Brawley Geothermal Area|
|Has improper value for||ExplorationHistory +|
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"Geothermal exploration in Imperial Valley …
"Geothermal exploration in Imperial Valley began in the 1960s, but the first geothermal exploration specifically at North Brawley began in the 1970s by Union Oil Company (Unocal), Chevron Oil Company, and Grace Geothermal Company. Many geophysical studies were conducted and many temperature gradient wells were drilled during the initial exploration in the early 1970s. Unocal drilled a total of 39 temperature gradient wells at a depth of 76 m and Grace Geothermal Corporation drilled 13 at a depth of 152 m. The thermal gradient wells revealed an anomaly roughly 26 km2 with a temperature gradient of 7°C/30 m.'"`UNIQ--ref-0000002D-QINU`"' In 1975, Unocal began drilling deep exploration wells-- 14 in total. Chevron also drilled two deep wells on the western side of the known geothermal area. The geothermal reservoir was discovered to have temperatures of 274°C at 1524-2134 m depth. The reservoir is highly fractured and productive with well head pressures of around 450 psig and mass flow rates of 5292-7560 kg/s.'"`UNIQ--ref-0000002E-QINU`"' In 1980, a 10 MW experimental power plant began operations for several years. After the plant shut down there was little exploration activity at North Brawley until 2006, when Ormat Nevada, Inc. restarted exploration and development practices in North Brawley.'"`UNIQ--ref-0000002F-QINU`"' Many geophysical studies have been done in North Brawley throughout the years: seismic refraction, electrical resistivity, and gravity, to name a few; however the details on many of these studies are proprietary and in unpublished reports. A large amount of regional geophysical studies have been done as well; these studies cover the entire Imperial Valley but do not focus specifically on North Brawley. The [[Salton Sea Geothermal Area]] has been the focus of the majority of geophysical studies for geothermal areas in the region." cannot be used as a page name in this wiki. The given value was not understood.wiki. The given value was not understood. +
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