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Title: Geophysical logging case history of the Raft River geothermal system, Idaho

Drilling to evaluate the geothermal resource in the Raft River Valley began in 1974 and resulted in the discovery of a geothermal reservoir at a depth of approximately 1523 m (500 ft). Several organizations and companies have been involved in the geophysical logging program. There is no comprehensive report on the geophysical logging, nor has there been a complete interpretation. The objectives of this study are to make an integrated interpretation of the available data and compile a case history. Emphasis has been on developing a simple interpretation scheme from a minimum of data sets. The Raft River geothermal system occurs in the Raft River Valley, which is a portion of the Basin and Range geomorphic province located in south central Idaho, south of the Snake River Plain. The valley is a late Cenozoic structural downwarp bounded by faults on the west, south, and east. The downwarp is filled with Tertiary and Paleozoic sediments, metasediments, and volcanics that overlie Precambrian rocks. The variety of rock types, the presence of alteration products, and the variability of fracturing make reliable interpretations difficult. However, the cross plotting of various parameters has allowed a determination of rock types and an analysis of the degreemore » of alteration and the density of fractures. Thus, one can determine the relevant data necessary to assess a geothermal reservoir in similar rock types and use cross plots to potentially define the producing zones.« less
Authors:
;
Publication Date:
OSTI Identifier:
5490655
Report Number(s):
LA-8252-MS
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Technical Report
Research Org:
Los Alamos Scientific Lab., NM (USA); Boise State Univ., ID (USA)
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; GEOTHERMAL WELLS; WELL LOGGING; RAFT RIVER VALLEY; DATA ANALYSIS; FRACTURING; GEOLOGY; GEOMORPHOLOGY; GEOTHERMAL RESOURCES; IDAHO; ROCKS; WELL DRILLING; COMMINUTION; DRILLING; NORTH AMERICA; PACIFIC NORTHWEST REGION; RESOURCES; USA; WELLS Geothermal Legacy 150303* -- Geothermal Exploration & Exploration Technology-- Exploratory Drilling & Well Logging