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Title: Investigation of Low-Temperature Geothermal Resources in the Sonoma Valley Area, California

Abstract

The Sonoma Valley area contains low-temperature geothermal resources (20 C {le} T {le} 90 C) having the potential for useful development. Sonoma Valley residents, local governments and institutions, private developers, and manufacturers may be able to utilize the geothermal resources as an alternate energy source. Historically, there have been at least six geothermal spring areas developed in the Sonoma Valley. Four of these (Boyes Hot Springs, Fetter's Hot Springs, Agua Caliente Springs, and the Sonoma State Hospital warm spring) lie on a linear trend extending northwestward from the City of Sonoma. Detailed geophysical surveys delineated a major fault trace along the east side of the Sonoma Valley in association with the historic geothermal areas. Other fault traces were also delineated revealing a general northwest-trending structural faulting fabric underlying the valley. Water wells located near the ''east side'' fault have relatively high boron concentrations. Geochemical evidence may suggest the ''east side'' fault presents a barrier to lateral fluid migration but is a conduit for ascending fluids. Fifteen of the twenty-nine geothermal wells or springs located from literature research or field surveys are located along or east of this major fault in a 10 km (6.2 miles) long, narrow zone. The highestmore » recorded water temperature in the valley appears to be 62.7 C (145 F) at 137.2 meters (450 feet) in a well at Boyes Hot Springs. This is consistent with the geothermal reservoir temperature range of 52-77 C (126-171 F) indicated by geothermometry calculations performed on data from wells in the area. Interpretation of data indicates a low-temperature geothermal fluid upwelling or ''plume'', along the ''east side'' fault with subsequent migration into permeable aquifers predominantly within volcanic strata. It is quite likely other geothermal fluid ''plumes'' in association with faulting are present within the Sonoma Valley area. A 5.8 km{sup 2} geothermal zone, that parallels the fault trace, is delineated and is perhaps the most favorable area for further investigation and possible geothermal production.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
DOEEEGTP (USDOE Office of Energy Efficiency and Renewable Energy Geothermal Tech Pgm)
Sponsoring Org.:
USDOE
OSTI Identifier:
897426
DOE Contract Number:  
DE-FG03-81SF10855
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; AQUIFERS; BORON; ENERGY SOURCES; GEOPHYSICAL SURVEYS; GEOTHERMAL FIELDS; GEOTHERMAL FLUIDS; GEOTHERMAL RESOURCES; GEOTHERMAL WELLS; GEOTHERMOMETRY; HOT SPRINGS; LOCAL GOVERNMENT; MANUFACTURERS; PLUMES; RESERVOIR TEMPERATURE; UPWELLING; WARM SPRINGS; WATER WELLS; Geothermal Legacy

Citation Formats

Youngs, Leslie G, Chapman, Rodger H, Chase, Gordon W, Bezore, Stephen P, and Majmundar, Hasu H. Investigation of Low-Temperature Geothermal Resources in the Sonoma Valley Area, California. United States: N. p., 1983. Web. doi:10.2172/897426.
Youngs, Leslie G, Chapman, Rodger H, Chase, Gordon W, Bezore, Stephen P, & Majmundar, Hasu H. Investigation of Low-Temperature Geothermal Resources in the Sonoma Valley Area, California. United States. https://doi.org/10.2172/897426
Youngs, Leslie G, Chapman, Rodger H, Chase, Gordon W, Bezore, Stephen P, and Majmundar, Hasu H. 1983. "Investigation of Low-Temperature Geothermal Resources in the Sonoma Valley Area, California". United States. https://doi.org/10.2172/897426. https://www.osti.gov/servlets/purl/897426.
@article{osti_897426,
title = {Investigation of Low-Temperature Geothermal Resources in the Sonoma Valley Area, California},
author = {Youngs, Leslie G and Chapman, Rodger H and Chase, Gordon W and Bezore, Stephen P and Majmundar, Hasu H},
abstractNote = {The Sonoma Valley area contains low-temperature geothermal resources (20 C {le} T {le} 90 C) having the potential for useful development. Sonoma Valley residents, local governments and institutions, private developers, and manufacturers may be able to utilize the geothermal resources as an alternate energy source. Historically, there have been at least six geothermal spring areas developed in the Sonoma Valley. Four of these (Boyes Hot Springs, Fetter's Hot Springs, Agua Caliente Springs, and the Sonoma State Hospital warm spring) lie on a linear trend extending northwestward from the City of Sonoma. Detailed geophysical surveys delineated a major fault trace along the east side of the Sonoma Valley in association with the historic geothermal areas. Other fault traces were also delineated revealing a general northwest-trending structural faulting fabric underlying the valley. Water wells located near the ''east side'' fault have relatively high boron concentrations. Geochemical evidence may suggest the ''east side'' fault presents a barrier to lateral fluid migration but is a conduit for ascending fluids. Fifteen of the twenty-nine geothermal wells or springs located from literature research or field surveys are located along or east of this major fault in a 10 km (6.2 miles) long, narrow zone. The highest recorded water temperature in the valley appears to be 62.7 C (145 F) at 137.2 meters (450 feet) in a well at Boyes Hot Springs. This is consistent with the geothermal reservoir temperature range of 52-77 C (126-171 F) indicated by geothermometry calculations performed on data from wells in the area. Interpretation of data indicates a low-temperature geothermal fluid upwelling or ''plume'', along the ''east side'' fault with subsequent migration into permeable aquifers predominantly within volcanic strata. It is quite likely other geothermal fluid ''plumes'' in association with faulting are present within the Sonoma Valley area. A 5.8 km{sup 2} geothermal zone, that parallels the fault trace, is delineated and is perhaps the most favorable area for further investigation and possible geothermal production.},
doi = {10.2172/897426},
url = {https://www.osti.gov/biblio/897426}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}