Fracture Network Geometry as Revealed by Seismicity and Distributed Temperature Sensing During Egs Collab Experiment 2
Description:
The EGS Collab experiment aims to validate numerical models of fracture propagation, permeability enhancement, and heat flow at a depth relevant to power-producing enhanced geothermal systems. The second and final phase of the experiment took place in the Sanford Underground Research Facility between March and August 2022 with a series of stimulation and flow tests at pressures both above and below the minimum principal stress at 4100 ft depth. A broad array of geophysical instruments was installed to monitor the experiment, including standard piezoelectric accelerometers, Continuous Active Source Seismic Monitoring (CASSM), electrical resistivity tomography, and a full fiber optic sensing suite including temperature, strain, and acoustic measurements on five separate interrogators. Here we present the catalog of detected seismic events along with the temperature measured by distributed fiber optics in four boreholes. The temperature data and seismic catalog, which contains hundreds of events, are two of our most powerful tools used to constrain the geometry of the fracture network created during the experiment. Our results provide information on the direction of fracture propagation and fluid flow in the testbed and show that subtle changes in flow rate drive dramatic changes in the flow through the stimulated fracture network.
Session: Seismology for the Energy Transition
Type: Oral
Date: 4/18/2023
Presentation Time: 05:15 PM (local time)
Presenting Author: Chet Hopp
Student Presenter: No
Invited Presentation:
Authors
Chet Hopp Presenting Author Corresponding Author chopp@lbl.gov Lawrence Berkeley National Laboratory |
Verónica Rodríguez Tribaldos vrodrigueztribaldos@lbl.gov GFZ Potsdam |
Jonathan Ajo-Franklin ja62@rice.edu Rice University |
Lianjie Huang ljh@lanl.gov Los Alamos National Laboratory |
Todd Wood tjwood@lbl.gov Lawrence Berkeley National Laboratory |
Paul Cook pjcook@lbl.gov Lawrence Berkeley National Laboratory |
Alex Morales armorales@lbl.gov Lawrence Berkeley National Laboratory |
Paul Schwering pcschwe@sandia.gov Sandia National Laboratories |
Dennise Templeton templeton4@llnl.gov Lawrence Livermore National Laboratory |
Tim Johnson tj@pnnl.gov Pacific Northwest National Laboratory, Richland, Washington, United States |
Hunter Knox hunter.knox@pnnl.gov Pacific Northwest National Laboratory, Richland, Washington, United States |
Pat Dobson pfdobson@lbl.gov Lawrence Berkeley National Laboratory, Berkeley, California, United States |
Doug Blankenship dablank@sandia.gov Sandia National Laboratories, Albuquerque, New Mexico, United States |
Tim Kneafsey tjkneafsey@lbl.gov Lawrence Berkeley National Laboratory, Berkeley, California, United States |
Michelle Robertson mcrobertson@lbl.gov Lawrence Berkeley National Laboratory, Berkeley, California, United States |
Fracture Network Geometry as Revealed by Seismicity and Distributed Temperature Sensing During Egs Collab Experiment 2
Category
Seismology for the Energy Transition