Preliminary Analysis of Stress in the Newberry EGS Well NWG 55-29
- Temple Univ., Philadelphia, PA (United States)
- U.S. Geological Survey, Menlo Park, CA (United States)
As part of the planning for stimulation of the Newberry Volcano Enhanced Geothermal Systems (EGS) Demonstration project in Oregon, a high-resolution borehole televiewer (BHTV) log was acquired using the ALT ABI85 BHTV tool in the slightly deviated NWG 55-29 well. The image log reveals an extensive network of fractures in a conjugate set striking approximately N-S and dipping 50° that are well oriented for normal slip and are consistent with surface-breaking regional normal faults in the vicinity. Similarly, breakouts indicate a consistent minimum horizontal stress, Shmin, azimuth of 092.3±17.3°. In conjunction with a suite of geophysical logs, a model of the stress magnitudes constrained by the width of breakouts at depth and a model of rock strength independently indicates a predominantly normal faulting stress regime.
- Research Organization:
- AltaRock Energy, Inc., Seattle, WA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- DOE Contract Number:
- EE0002777
- OSTI ID:
- 1023224
- Report Number(s):
- DOE/EE-2777/3
- Resource Relation:
- Conference: Geothermal Resources Council Annual Meeting, San Diego, CA (United States), 23-26 Oct 2011
- Country of Publication:
- United States
- Language:
- English
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