Towards Best Practices for Egs Seismic Monitoring: Insights Gained at Utah Forge
Description:
The Department of Energy Frontier Observatory for Research in Geothermal Energy (FORGE) program has a mission to enable research and advances in drilling and technology to facilitate a pathway for commercial Engineered Geothermal Systems (EGS). In January 2021 at Utah FORGE, an ~3 km deep horizontally deviated well was drilled through basement rock at temperatures over 220oC. In April 2022, the horizontal deviated section of this well was stimulated in three stages. At the Utah FORGE site multiple scales and types of seismic instrumentation are utilized to monitor background seismicity and reservoir stimulation phases. The Utah FORGE site has a local seismic network of broadband and accelerometer sensors and four deep vertical boreholes (three at reservoir depth; two with DAS cemented into the casing) where 3C sensor arrays were deployed during stimulation phases. During the 2022 stimulation, the local seismic network was utilized for a magnitude-based traffic light system, while data from the multiple boreholes were integrated to generate a near-real-time catalog to monitor reservoir development, and the near-real-time catalog and hydraulic data were used to test adaptive traffic light systems. In addition, two dense surface geophone experiments were conducted—one focused on event detection and the second for velocity model development. There was also an experiment utilizing horizontal DAS at the surface and following the stimulation a walk away vertical seismic profile experiment. In September 2022, a post-stimulation seismic workshop was held on the University of Utah campus. Groups that had participated in seismic monitoring of the stimulation or that had conducted other seismic related experiments participated. The meeting was structured to cover four key topics: (1) seismic instrumentation, (2) seismic network design, (3) seismic monitoring protocol, and (4) development and implementation of adaptive seismic traffic light systems. Here, we describe the 2022 monitoring effort and thoughts on future seismic monitoring at Utah FORGE and the monitoring of EGS systems more generally.
Session: De-risking Deep Geothermal Projects: Geophysical Monitoring and Forecast Modeling Advances
Type: Oral
Date: 4/18/2023
Presentation Time: 11:00 AM (local time)
Presenting Author: Kristine L. Pankow
Student Presenter: No
Invited Presentation:
Authors
Kristine Pankow Presenting Author Corresponding Author pankow@seis.utah.edu University of Utah |
Ben Dyer b.dyer@geo-energie.ch Geo-Energie Suisse AG |
James Rutledge rutledge@swcp.com Santa Fe Seismic, LLC |
Falko Bethmann f.bethmann@geo-energie.ch Geo-Energie Suisse AG |
David Eaton eatond@ucalgary.ca University of Calgary |
Dimitrios Karvounis d.karvounis@geo-energie.ch Geo-Energie Suisse AG |
Federica Lanza federica.lanza@sed.ethz.ch Swiss Seismological Service, ETH Zurich |
Alejandro Martinez ammartinez@slb.com SLB |
John McLennan jmclennan@egi.utah.edu University of Utah |
Manuel M Mendoza Manuel.Mendoza@colorado.edu University of Colorado, Boulder, Colorado, United States |
Nori Nakata nnakata@lbl.gov Lawrence Berkeley National Laboratory, Berkeley, California, United States |
Gesa Petersen gesap@gfz-potsdam.de GFZ Potsdam, Potsdam, , Germany |
Hongrui Qiu qiuhonrui@gmail.com Lawrence Berkeley National Laboratory, Berkeley, California, United States |
Anne F Sheehan Anne.Sheehan@colorado.edu Unversity of Colorado, Boulder, Colorado, United States |
Katherine M Whidden whidden@seis.utah.edu University of Utah, Salt Lake City, Utah, United States |
Towards Best Practices for Egs Seismic Monitoring: Insights Gained at Utah Forge
Category
De-risking Deep Geothermal Projects: Geophysical Monitoring and Forecast Modeling Advances