Preliminary Analysis of Stress in the Newberry EGS Well NWG 55-29
Description
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 deg 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 deg. 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.
Resources
| Name |
Format |
Description |
Link |
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33 |
Preliminary Analysis of Stress in the Newberry EGS Well NWG 55-29 |
https://gdr.openei.org/files/737/davatzes-and-hickman-2011.pdf |
Tags
- publication
- egs
- stress-analysis
- enhanced-geothermal-system
- enhanced-geothermal-systems
- newgen
- monitoring
- well-data
- 4d
- stress
- newberry
- oregon
- geothermal