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Title: Lithologic interpretation of the De Braga No. 2 and Richard Weishaupt No. 1 geothermal wells, Stillwater project, Churchill County, Nevada

Lithologies penetrated throughout the upper 732 to 838 m (2400 to 2750 ft) within the Stillwater prospect area are terrigenous sediments of Pleistocene to Recent age. A sill of dacite to andesite composition with a thickness variable between 122 to 208 m (400 to 680 ft) is present below the terrigenous sediments. Between the base of the sill and the top of the Bunejug Formation are intercalated volcanic and sedimentary rocks. All formations overlying the Bunejug Formation are probably of Pleistocene age. The basalt and basaltic-andesite flows and ash below the depth of approximately 1128 m (3700 ft) are herein assigned to the Bunejug Formation (Morrison, 1964) of Pliocene and possibly early Pleistocene age. The Bunejug Formation is a thick sequence of basalt to andesite flows and hyaloclastite exposed in the mountains surrounding the south half of the Carson Desert. The De Braga No. 2 well bottomed in Bunejug volcanics at a depth of 2109 m (6920 ft). The Richard Weishaupt No. 1 well penetrated the entire Bunejug sequence and entered felsic volcanics and tuffaceous sediments, which possibly represent part of the Truckee Formation, at a depth of approximately 2412 m (7915 ft).
Authors:
;
Publication Date:
OSTI Identifier:
5349386
Report Number(s):
DOE/ID/12079-57; ESL-70
ON: DE82019935
DOE Contract Number:
AC07-79ID12079
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of document are illegible
Research Org:
Utah Univ., Salt Lake City (USA). Research Inst.
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL WELLS; LITHOLOGY; NEVADA; ANDESITES; BASALT; GEOLOGIC AGES; SEDIMENTARY ROCKS; SEDIMENTS; VOLCANIC ROCKS; FEDERAL REGION IX; IGNEOUS ROCKS; NORTH AMERICA; ROCKS; USA; WELLS Geothermal Legacy 150201* -- Geology & Hydrology of Geothermal Systems-- USA-- (-1989)