Lithologically Controlled
Controlling Structures

Hydrothermal fluids may be lithologically controlled as is the case in the Salton Trough region where sandstones often lack cement (due to certain properties of the local hydrothermal fluid) allowing for increased permeability, capped by less porous shales.
Examples
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Geothermal Resource Area | Geothermal Region | Tectonic Setting | Host Rock Age | Host Rock Lithology | Mean Capacity | Mean Reservoir Temp |
---|---|---|---|---|---|---|
Fenton Hill HDR Geothermal Area | Rio Grande Rift | Rift Zone Extensional Tectonics | Precambrian | Crystalline basement “pCu” (undifferentiated in map units); Biotite Granodiorite (Phase I Reservoir); Gneiss, Schist, Granodiorite, Granite, Metavolcanic Rocks (Phase II Reservoir) | 20 MW20,000 kW <br />20,000,000 W <br />20,000,000,000 mW <br />0.02 GW <br />2.0e-5 TW <br /> | 508.15 K235 °C <br />455 °F <br />914.67 °R <br /> |