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Fracture mapping in geothermal fields with long-offset induction logging

Conference ·
OSTI ID:593759
 [1];  [2];  [3];  [4]; ;  [5]
  1. Electromagnetic Instruments, Inc., Richmond, CA (United States)
  2. Geothermal Energy Research and Development Co. Ltd., Tokyo (Japan)
  3. New Energy and Industrial Technology Development Organization, Tokyo (Japan)
  4. Lawrence Livermore National Lab., CA (United States)
  5. Lawrence Berkeley National Lab., CA (United States)
+ Show Author Affiliations
The mapping of producing fractures in a geothermal field is an important technical objective in field development. Locating, orientating, and assessing producing fractures can guide drilling programs and optimize the placement of production and injection wells. A long-offset multicomponent borehole induction resistivity tool capable of surviving the high temperatures encountered in geothermal wells has recently been developed and tested in a high temperature environment. Several characteristics of this device make it ideal for detecting producing fractures. Whereas commercial induction logging devices have strong source-receiver separations of 1 m, this device has multiple sensors with separation of 8 m, allowing for deeper penetrations and the ability to straddle fracture-induced washout zones in boreholes. The three-component measurements also make it possible to map the strike and inclination of nearby fractures and other three-dimensional structures. This in turn allows for accurate projection of these structures into the space between wells.
Research Organization:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Organization:
USDOE, Washington, DC (United States)
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
593759
Report Number(s):
UCRL-JC--126397; CONF-970114--5; ON: DE97053392
Country of Publication:
United States
Language:
English

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Related Subjects

15 GEOTHERMAL ENERGY
44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
BOREHOLES
ELECTRIC CONDUCTIVITY
FRACTURES
GEOTHERMAL FIELDS
Geothermal Legacy
MAPPING