Fracturing in The Northwest Geysers, Sonoma County, California
- Key words
- Drilling; USA; California; Sonoma; Geysers; Faults; Geologic Maps; Cores; Reservoir Models; Exploratory Well; Mineralization; Porosity; Reservoir Rock; Rose Diagrams; Dip Histogram; Prati 5; Prati 12
- Location
- The Geysers, California
- Conference
- Geothermal Resources Council Transactions
- Year
- 1991
- Session
- Exploration; Geological surveys; Fractures; Mapping; Core sa
- Language
- English
Abstract
Fracturing in the northwest Geysers is discussed in terms of both geologic mapping and measurements of fracture trends in oriented core. Faults of importance to the geothermal system include thrust faults followed din time by northeast trending faults with apparent normal displacement. Measurements of fracture orientations in core show trends perpendicular to the least principal stress as well as fracturing apparently controlled by lithologic variables. Fracturing in the Geysers is complex, and different areas of the steam field may be dominated by fractures of different origins, and orientations.
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