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Geothermal Resource­ Base Assessment

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Geothermal Resource­ Base Assessment ( geothermal-resource­-base-assessment )

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Chapter 2 Geothermal Resource­Base Assessment Table 2.2. High­grade EGS areas (>200°C at depths of about 4 km). Region Characteristics Great Basin 30% of the 500 km x 500 km area is at temperatures > 200°C. Highly variable geologic and thermal conditions with some drilling confirming deep conditions. Large­scale fluid flow both laterally and 2­24 horizontally so extensive fracturing at depth in many areas. The stress regime is extensional. Rocks are highly variable with depths of 4­10 km, mostly sedimentary with some granite and other basement rock types. Snake River Plain and margins 75% of the 75 km x 500 km area is at temperatures > 200°C. Details of the geology at depths of 3­10 km unknown, probably volcanics and sediments overlaying granitic basement at 3­5 km, low permeability. The stress regime is unknown, existing fracturing may be limited. Oregon Cascade Range 25% of the 50 km x 200 km area is at high, uniform temperatures and with similar geology (volcanic and intrusive rocks dominate). The margins of the area are accessible. The stratovolcanoes are excluded from the analysis. Conditions are more variable in California and Washington, but some high­grade resources probably exist there as well. Southern Rocky Mountains 25% of the 100 km x 300 km area is at temperatures > 200°C. Geology is variable. Area includes the northern Rio Grande Rift and the Valles Caldera. Can have sediments over basement, generally thermal conditions in basement are unknown. Both high crustal radioactivity and high mantle heat flow contribute to surface heat flow. Probably highest basement EGS potential on a large scale. Salton Sea 75% of the 25 km x 50 km area is at temperatures > 200°C. Young sedimentary basin with very high heat flow, young metamorphosed sedimentary rocks at depth. There is extensive drilling in the existing geothermal systems and limited background data available from hydrocarbon exploration. Clear Lake Volcanic Field 50% of the 30 x 30 km area is at temperatures > 200°C (steam reservoir is 5 km x 10 km). Low­permeability Franciscan sediments, may find granite at deeper depths. Possible access problems. Significant deep drilling with temperatures of 200°C at 2 km over a large area.

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