Abstract
Reliable monitoring of fractures created during water/fluid injection in enhanced geothermal systems (EGS) is crucial for understanding the efficacy of the fracturing process. The EGS Collab project is a new research effort initiated by the US DOE Geothermal Technologies Office (GTO) to study the rock mass response to simulation. We conduct numerical modeling of active and passive seismic monitoring and alternative displacement-type measurement for monitoring hydraulic fracturing growth at the EGS Collab experiment site. We perform elastic-wave sensitivity propagation to provide the best locations to place geophones to record most significant information reflected/transmitted/scattered from the fracture plane. Our numerical results show that the optimal locations to record significant seismic signals from the fracture plane are within an anisotropic spatial region. For cost-effective passive seismic monitoring, we study the relationships between standard deviation errors of micro-earthquake locations and geophone distributions within multiple monitoring wells. Our results show that only two geophones per well are required for reliable event location, and that the combination of parallel and perpendicular wells does not help with MEQ event location. We conduct finite-element modeling to study the feasibility of using alternative displacement-type measurement to monitor hydraulic fracturing growth at the EGS Collab experiment site. Our numerical modeling results can help determine the geophysical monitoring strategy during the EGS Collab experiments.
Original language | English |
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Title of host publication | Geothermal Energy |
Subtitle of host publication | Power To Do More - Geothermal Resources Council 2017 Annual Meeting, GRC 2017 |
Publisher | Geothermal Resources Council |
Pages | 893-909 |
Number of pages | 17 |
ISBN (Electronic) | 0934412227 |
State | Published - 2017 |
Event | Geothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017 - Salt Lake City, United States Duration: Oct 1 2017 → Oct 4 2017 |
Publication series
Name | Transactions - Geothermal Resources Council |
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Volume | 41 |
ISSN (Print) | 0193-5933 |
Conference
Conference | Geothermal Resources Council 41st Annual Meeting - Geothermal Energy: Power To Do More, GRC 2017 |
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Country/Territory | United States |
City | Salt Lake City |
Period | 10/1/17 → 10/4/17 |
Funding
This project is supported by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (GTO) through contract No. DE-AC52-06NA25396 to Los Alamos National Laboratory (LANL), contract No. DEAC02-05CH11231 to Lawrence Berkeley National Laboratory, and contract No. DE-AC52-07NA27344 to Lawrence Livermore National Laboratory. The computation was performed using super-computers of LANL's Institutional Computing Program as well as facilities of LLNL’s Livermore Computing Center. This project is supported by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (GTO) through contract No. DE-AC52-06NA25396 to Los Alamos National Laboratory (LANL), contract No. DEAC02-05CH11231 to Lawrence Berkeley National Laboratory, and contract No. DE-AC52-07NA27344 to Lawrence Livermore National Laboratory. The computation was performed using super-computers of LANL's Institutional Computing Program as well as facilities of LLNL's Livermore Computing Center.
Funders | Funder number |
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U.S. Department of Energy | |
Office of Energy Efficiency and Renewable Energy | |
Lawrence Berkeley National Laboratory | DE-AC52-07NA27344 |
Lawrence Berkeley National Laboratory | |
Los Alamos National Laboratory | DEAC02-05CH11231 |
Los Alamos National Laboratory | |
Geothermal Technologies Office |
Keywords
- Active seismic
- Anisotropic media
- Elastic-wave sensitivity
- Enhanced geothermal systems (EGS)
- Finite-element modeling
- Fracturing
- Monitoring
- Passive seismic
- Strain
- Tilt