3D Imaging of Geothermal Faults from a Vertical DAS Fiber at Brady Hot Spring, NV USA
Abstract
In March 2016, arguably the most ambitious 4D (3D space + over time) active-source seismic survey for geothermal exploration in the U.S. was acquired at Brady Natural Laboratory, outside Fernley, Nevada. The four-week experiment included 191 vibroseis source locations, and approximately 130 m of distributed acoustic sensing (DAS) in a vertical well, located at the southern end of the survey area. The imaging of the geothermal faults is done with reverse time migration of the DAS data for both P-P and P-S events in order to generate 3D models of reflectivity, which can identify subsurface fault locations. Three scenarios of receiver data are explored to investigate the reliability of the reflectivity models obtained: (1) Migration of synthetic P-P and P-S DAS data, (2) migration of the observed field DAS data and (3) migration of pure random noise to better assess the validity of our results. The comparisons of the 3D reflectivity models from these three scenarios confirm that sections of three known faults at Brady produce reflected energy observed by the DAS. Two faults that are imaged are ~1 km away from the DAS well; one of these faults (middle west-dipping) is well-constructed for over 400 m along the fault’smore »
- Authors:
-
[2];
- Colorado School of Mines, Golden, CO (United States)
- DownUnder Geosolutions, Golden, CO (United States)
- Cimarex, Tulsa, OK (United States)
- Publication Date:
- Research Org.:
- Temple Univ., Philadelphia, PA (United States); Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1613302
- Grant/Contract Number:
- EE0005510; EE0006760
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Energies
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 7; Journal ID: ISSN 1996-1073
- Publisher:
- MDPI AG
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 10 SYNTHETIC FUELS; energy & fuels; distributed acoustic sensing; depth migration; faults
Citation Formats
Trainor-Guitton, Whitney, Guitton, Antoine, Jreij, Samir, Powers, Hayden, and Sullivan, Bane. 3D Imaging of Geothermal Faults from a Vertical DAS Fiber at Brady Hot Spring, NV USA. United States: N. p., 2019.
Web. doi:10.3390/en12071401.
Trainor-Guitton, Whitney, Guitton, Antoine, Jreij, Samir, Powers, Hayden, & Sullivan, Bane. 3D Imaging of Geothermal Faults from a Vertical DAS Fiber at Brady Hot Spring, NV USA. United States. https://doi.org/10.3390/en12071401
Trainor-Guitton, Whitney, Guitton, Antoine, Jreij, Samir, Powers, Hayden, and Sullivan, Bane. Mon .
"3D Imaging of Geothermal Faults from a Vertical DAS Fiber at Brady Hot Spring, NV USA". United States. https://doi.org/10.3390/en12071401. https://www.osti.gov/servlets/purl/1613302.
@article{osti_1613302,
title = {3D Imaging of Geothermal Faults from a Vertical DAS Fiber at Brady Hot Spring, NV USA},
author = {Trainor-Guitton, Whitney and Guitton, Antoine and Jreij, Samir and Powers, Hayden and Sullivan, Bane},
abstractNote = {In March 2016, arguably the most ambitious 4D (3D space + over time) active-source seismic survey for geothermal exploration in the U.S. was acquired at Brady Natural Laboratory, outside Fernley, Nevada. The four-week experiment included 191 vibroseis source locations, and approximately 130 m of distributed acoustic sensing (DAS) in a vertical well, located at the southern end of the survey area. The imaging of the geothermal faults is done with reverse time migration of the DAS data for both P-P and P-S events in order to generate 3D models of reflectivity, which can identify subsurface fault locations. Three scenarios of receiver data are explored to investigate the reliability of the reflectivity models obtained: (1) Migration of synthetic P-P and P-S DAS data, (2) migration of the observed field DAS data and (3) migration of pure random noise to better assess the validity of our results. The comparisons of the 3D reflectivity models from these three scenarios confirm that sections of three known faults at Brady produce reflected energy observed by the DAS. Two faults that are imaged are ~1 km away from the DAS well; one of these faults (middle west-dipping) is well-constructed for over 400 m along the fault’s strike, and 300 m in depth. These results confirm that the DAS data, together with an imaging engine such as reverse time migration, can be used to position important geothermal features such as faults.},
doi = {10.3390/en12071401},
journal = {Energies},
number = 7,
volume = 12,
place = {United States},
year = {Mon Apr 01 00:00:00 EDT 2019},
month = {Mon Apr 01 00:00:00 EDT 2019}
}
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