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

Technical Report · Tue Apr 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/5490655· OSTI ID:5490655

Applegate, J K; Moens, T A

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 degree 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.

• Research Organization: Los Alamos Scientific Lab., NM (USA); Boise State Univ., ID (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5490655
• Report Number(s): LA-8252-MS
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150303* -- Geothermal Exploration & Exploration Technology-- Exploratory Drilling & Well Logging
COMMINUTION
DATA ANALYSIS
DRILLING
FRACTURING
GEOLOGY
GEOMORPHOLOGY
GEOTHERMAL RESOURCES
GEOTHERMAL WELLS
Geothermal Legacy
IDAHO
NORTH AMERICA
PACIFIC NORTHWEST REGION
RAFT RIVER VALLEY
RESOURCES
ROCKS
USA
WELL DRILLING
WELL LOGGING
WELLS