Estimating fracture parameters from p-wave velocity profiles about a geothermal well
The feasibility of locating fracture zones and estimating their crack parameters was examined using an areal well shoot method centered on Utah State Geothermal Well 9-1, Beaver County, Utah. High-resolution travel time measurements were made between a borehole sensor and an array of shot stations distributed radially and azimuthally about the well. Directional velocity behavior in the vicinity of the well was investigated by comparing velocity logs derived from the travel time data. Three fracture zones were identified form the velocity data, corroborating fracture indicators seen in other geophysical logs conducted in Well 9-1. Crack densities and average crack aspect ratios for these fracture zones were estimated using a self-consistent velocity theory (O'Connell and Budiansy 1974). Probable trends of these fracture zones were established from a combination of the data from the more distant shot stations and the results of a gravity survey. The results of this study indicate that the areal well shoot is a potentially powerful tool for the reconnaisance of fracture-controlled fluid and gas reservoirs. Improvements in methodology and hardware could transform it into an operationally viable survey method.
- Research Organization:
- University of Southern California, Los Angeles (USA). Earth and Space Sciences Inst.
- DOE Contract Number:
- FC07-79ID12068
- OSTI ID:
- 5349214
- Report Number(s):
- DOE/ID/12068-T1; ON: DE82014291
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ROOSEVELT HOT SPRINGS
GEOPHYSICAL SURVEYS
CRACKS
FRACTURES
GEOLOGICAL SURVEYS
GEOTHERMAL EXPLORATION
GEOTHERMAL WELLS
GRAVITY SURVEYS
SEISMIC SURVEYS
UTAH
VELOCITY
WELL LOGGING
EXPLORATION
FAILURES
FEDERAL REGION VIII
KGRA
NORTH AMERICA
SURVEYS
USA
WELLS
Geothermal Legacy
150301* - Geothermal Exploration & Exploration Technology- Geophysical Techniques & Surveys