skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Tuscarora area, Nevada: geothermal reservoir assessment case history, northern basin and range. Final report, 1 October 1978-9 September 1980

Abstract

The Tuscarora prospect is located at the north end of Independence Valley approximately 90 km north-northwest of Elko, Nevada. Geothermal exploration on the prospect consisted of an integrated program of geologic, hydrogeochemical and soil geochemistry studies. Geophysical exploration included heatflow studies, aeromagnetic, self-potential, gravity, dipole-dipole resistivity and magnetotelluric surveys. Exploration drilling includes thirty-two shallow thermal gradient holes, six intermediate depth temperature gradient wells and one 5454 foot test for discovery well. Shallow low-temperature reservoirs were encountered in the Tertiary rocks and in the Paleozoic rocks immediately beneath the Tertiary. Drilling problems forced the deep well to be stopped before the high-temperature reservoir was reached.

Authors:
Publication Date:
Research Org.:
AMAX Exploration, Inc., Wheat Ridge, CO (USA)
OSTI Identifier:
6254536
Report Number(s):
DOE/ET/27011-1
ON: DE82001328
DOE Contract Number:
AC08-79ET27011
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; NEVADA; GEOCHEMICAL SURVEYS; GEOLOGICAL SURVEYS; GEOPHYSICAL SURVEYS; GEOTHERMAL WELLS; GEOTHERMAL EXPLORATION; GRAVITY SURVEYS; HEAT FLOW; HYDROLOGY; MAGNETIC SURVEYS; MAGNETOTELLURIC SURVEYS; RESERVOIR TEMPERATURE; RESISTIVITY SURVEYS; SELF-POTENTIAL SURVEYS; TEMPERATURE GRADIENTS; WELL DRILLING; WELL LOGGING; DRILLING; ELECTRICAL SURVEYS; ELECTROMAGNETIC SURVEYS; EXPLORATION; NORTH AMERICA; SURVEYS; USA; WELLS; WESTERN REGION; Geothermal Legacy; 150300* - Geothermal Exploration & Exploration Technology

Citation Formats

Pilkington, H.D. Tuscarora area, Nevada: geothermal reservoir assessment case history, northern basin and range. Final report, 1 October 1978-9 September 1980. United States: N. p., 1981. Web. doi:10.2172/6254536.
Pilkington, H.D. Tuscarora area, Nevada: geothermal reservoir assessment case history, northern basin and range. Final report, 1 October 1978-9 September 1980. United States. doi:10.2172/6254536.
Pilkington, H.D. 1981. "Tuscarora area, Nevada: geothermal reservoir assessment case history, northern basin and range. Final report, 1 October 1978-9 September 1980". United States. doi:10.2172/6254536. https://www.osti.gov/servlets/purl/6254536.
@article{osti_6254536,
title = {Tuscarora area, Nevada: geothermal reservoir assessment case history, northern basin and range. Final report, 1 October 1978-9 September 1980},
author = {Pilkington, H.D.},
abstractNote = {The Tuscarora prospect is located at the north end of Independence Valley approximately 90 km north-northwest of Elko, Nevada. Geothermal exploration on the prospect consisted of an integrated program of geologic, hydrogeochemical and soil geochemistry studies. Geophysical exploration included heatflow studies, aeromagnetic, self-potential, gravity, dipole-dipole resistivity and magnetotelluric surveys. Exploration drilling includes thirty-two shallow thermal gradient holes, six intermediate depth temperature gradient wells and one 5454 foot test for discovery well. Shallow low-temperature reservoirs were encountered in the Tertiary rocks and in the Paleozoic rocks immediately beneath the Tertiary. Drilling problems forced the deep well to be stopped before the high-temperature reservoir was reached.},
doi = {10.2172/6254536},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1981,
month = 8
}

Technical Report:

Save / Share:
  • The McCoy geothermal prospect is located in north-central Nevada at the junction of the Augusta Mountains, Clan Alpine Mountains and the New Pass Range. Geothermal exploration on the prospect consisted of an integrated program of geologic, geochemical and geophysical studies. The geochemical studies included hydrogeochemistry, soil geochemistry, and drill cuttings geochemistry. Geophysical exploration included heatflow studies, aeromagnetic, self-potential, gravity, passive seismic, dipole-dipole resistivity, electromagnetic and magnetotelluric surveys. Exploration drilling includes fifty-two (52) shallow thermal gradient holes and five (5) intermediate depth temperature gradient wells. Shallow low-temperature geothermal reservoirs were encountered in two areas. In the McCoy Mine area the resourcemore » was found in the Permo-Pennsylvanian rocks. In the southern part of the prospect a resource with temperatures of 100/sup 0/C was encountered in the basal conglomeratic sandstone of the Triassic section.« less
  • The Baltazor KGRA and McGee/Painted Hills geothermal prospects are located in northern Humboldt County, Nevada along the northwestern margin of the Basin and Range province. Exploration work other than drilling has included groundwater sampling, a microearthquake study, a geologic literature search and photogeologic mapping, compilation of aeromagnetic and gravity mapping, soil mercury surveying, electrical resistivity and self-potential surveys and detailed hydrothermal alteration mapping. Exploration drilling included 27 shallow temperature gradient holes, four intermediate-depth gradient wells and one 3703-foot deep test, Baltazor 45-14. The deep test penetrated Miocene rhyolite, andesite, basalt and andesitic basalt flows before excessive hold deviation forced anmore » end to drilling and completion as a deep temperature observation well. A temperature survey two weeks after completion obtained a 119.7/sup 0/C (247.4/sup 0/F) reading at survey total depth, 1110 m (3640 feet).« less
  • Campbell E No. 2 well in the Humboldt House geothermal field in central Pershing County, Nevada was drilled to a depth of 8061 ft in order to confirm the existence of a commercial reservoir. This well offsets the field discovery well which was drilled in 1977 and completed to a depth of only 1835 ft. Desert Peak B-23-1 well was likewise drilled in order to help evaluate a previously discovered geothermal field located in northwestern Churchill County, Nevada. The Desert Peak B-23-1 well was drilled to a depth of 9641 ft as compared to the deepest of three earlier wellsmore » drilled to 7662 ft. The drilling and completion of both these wells are described, including the daily drilling reports, drill bit records, descriptions of the casing and cementing programs, drilling fluid descriptions including methods of combating lost circulation, wellhead equipment descriptions, and logging programs.« less
  • A Geothermal Reservoir Assessment Case Study was conducted in the Leach Hot Springs Known Geothermal Resource Area of Pershing County, Nevada. The case study included the drilling of twenty-three temperature gradient wells, a magnetotelluric survey, seismic data acquisition and processing, and the drilling of one exploratory well. Existing data from prior investigations, which included water geochemistry, gravity, photogeologic reports and a hydrothermal alteration study, was also provided. The exploratory well was drilled to total depth of 8565' with no significant mud losses or other drilling problems. A maximum temperature of 260/sup 0/F was recorded at total depth. The relatively lowmore » temperature and the lack of permeability (as shown by absence of mud loss) indicated that a current, economic geothermal resource had not been located, and the well was subsequently plugged and abandoned. However, the type and extent of rock alteration found implied that an extensive hot water system had existed in this area at an earlier time. This report is a synopsis of the case study activities and the data obtained from these activities.« less
  • Union Oil Company of California drilled two exploratory geothermal wells in the Stillwater geothermal prospect area in northwestern Nevada to obtain new subsurface data for inclusion in the geothermal reservoir assessment program. Existing data from prior investigations, which included the drilling of four earlier deep temperature gradient wells in the Stillwater area, was also provided. The two wells were drilled to total depths of 6946 ft and 10,014 ft with no significant drilling problems. A maximum reservoir temperature of 353 F was measured at 9950 ft. The most productive well flow tested at a rate of 152,000 lbs/hr with amore » wellhead temperature of 252 F and pressure of 20 psig. Based upon current economics, the Stillwater geothermal prospect is considered to be subcommercial for the generation of electrical power. This synopsis of the exploratory drilling activities and results contains summary drilling, geologic, and reservoir information from two exploratory geothermal wells.« less