Resource investigation of low- and moderate-temperature geothermal areas in Paso Robles, California
Ninety-eight geothermal wells and springs were identified and plotted, and a geologic map and cross sections were compiled. Detailed geophysical, geochemical, and geological surveys were conducted. The geological and geophysical work delineated the basement highs and trough-like depressions that can exercise control on the occurrence of the thermal waters. The Rinconada fault was also evident. Cross sections drawn from oil well logs show the sediments conforming against these basement highs and filling the depressions. It is along the locations where the sediments meet the basement highs that three natural warm springs in the area occur. Deep circulation of meteoric waters along faults seems to be a reasonable source for the warm water. The Santa Margarita, Pancho Rico, and Paso Robles Formations would be the first permeable zones that abut the faults through which water would enter. Temperatures and interpretation of well logs indicate the warmest aquifer at the base of the Paso Robles Formation. Warm water may be entering higher up in the section, but mixing with water from cooler zones seems to be evident. Geothermometry indicates reservoir temperatures could be as high as 91/sup 0/C (196/sup 0/F).
- Research Organization:
- California State Dept. of Conservation, Sacramento (USA). Div. of Mines and Geology
- DOE Contract Number:
- FG03-80SF10855
- OSTI ID:
- 6507764
- Report Number(s):
- DOE/SF/10855-T2; ON: DE84016519
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Open File Report 83-11 SAC
- Country of Publication:
- United States
- Language:
- English
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CALIFORNIA
GEOCHEMICAL SURVEYS
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GEOPHYSICAL SURVEYS
GEOTHERMAL EXPLORATION
GEOTHERMAL RESOURCES
GEOTHERMAL WELLS
GRAVITY SURVEYS
HYDROLOGY
MAGNETIC SURVEYS
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RESISTIVITY SURVEYS
RESOURCE ASSESSMENT
SEISMICITY
THERMAL SPRINGS
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150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys
150302 - Geothermal Exploration & Exploration Technology- Geochemical Techniques & Surveys