Reservoir assessment of The Geysers Geothermal field
Big Sulphur Creek fault zone, in The Geysers Geothermal field, may be part of a deep-seated, wrench-style fault system. Hydrothermal fluid in the field reservoir may rise through conduits beneath the five main anomalies associated with the Big Sulphur Creek wrench trend. Some geophysical anomalies (electrical resistivity and audio-magnetotelluric) evidently are caused by the hot water geothermal field or zones of altered rocks; others (gravity, P-wave delays, and possibly electrical resistivity) probably respresent the underlying heat source, a possible magma chamber; and others (microearthquake activity) may be related to the steam reservoir. A large negative gravity anomaly and a few low-resistivity anomalies suggest areas generally favorable for the presence of steam zones, but these anomalies apparently do not directly indicate the known steam reservoir. At the current generating capacity of 930 MWe, the estimated life of The Geysers Geothermal field reservoir is 129 years. The estimated reservoir life is 60 years for the anticipated maximum generating capacity of 2000 MWe as of 1990. Wells at The Geysers are drilled with conventional drilling fluid (mud) until the top of the steam reservoir is reached; then, they are drilled with air. Usually, mud, temperature, caliper, dual induction, and cement bond logs are run on the wells.
- Research Organization:
- California Div. of Oil and Gas, Sacramento (USA)
- DOE Contract Number:
- FG03-79ET27108
- OSTI ID:
- 5405171
- Report Number(s):
- DOE/ET/27108-T1; ON: DE82011700
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)
150301 -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
150303 -- Geothermal Exploration & Exploration Technology-- Exploratory Drilling & Well Logging
DRILLING
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
ENGINEERING
FLUID INJECTION
GEOLOGY
GEOPHYSICAL SURVEYS
GEOTHERMAL FIELDS
GEYSERS GEOTHERMAL FIELD
GRAVITY SURVEYS
Geothermal Legacy
MAGNETIC SURVEYS
MAGNETOTELLURIC SURVEYS
RESERVOIR ENGINEERING
RESISTIVITY SURVEYS
RESOURCE ASSESSMENT
SURVEYS
WELL COMPLETION
WELL DRILLING
WELL LOGGING