Case history on geothermal-well-log interpretation: Surprise Valley, California
Well logs from a 1972 geothermal well drilled in California's Surprise Valley are discussed. The well is in an igneous formation, primarily basalt in the logged interval, and had a bottom-hole temperature of about 170/sup 0/C at a total depth exceeding 1400 m. It produced good flow rates from what is presumably a formation with predominately fracture-related permeability. The well has special interest because fractures could be located approximately by the appearance of well-defined secondary crystallization in the drill cuttings. The original use of the log data in evaluating the well when it was drilled is discussed. In addition, the log data are reviewed and valuable data are obtained on log response in basalts, the effects of secondary mineralization, fracture detection, and aspects of the resistivity logs. The Surprise Valley well gives a clear demonstration of the value of thorough logging in geothermal exploratory wells, especially in the identification and location of potential production zones.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6309391
- Report Number(s):
- LA-8598-MS; ON: DE81028544
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sampling and Interpretation of Drill Cuttings from Geothermal Wells
Log Interpretation Techniques to Identify Production Zones in Geothermal Wells
Related Subjects
GEOTHERMAL WELLS
DATA ANALYSIS
WELL LOGGING
CALIFORNIA
DENSITY
DRILL CORES
EXPLORATORY WELLS
FRACTURES
INTERSTITIAL WATER
LITHOLOGY
NEUTRON LOGGING
PERMEABILITY
POROSITY
SP LOGGING
STRATIGRAPHY
ELECTRIC LOGGING
FAILURES
GEOLOGY
GROUND WATER
HYDROGEN COMPOUNDS
NORTH AMERICA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIOACTIVITY LOGGING
USA
WATER
WELLS
WESTERN REGION
Geothermal Legacy
150303* - Geothermal Exploration & Exploration Technology- Exploratory Drilling & Well Logging