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Title: EGS Collab Experiment 1: Microseismic Monitoring

Abstract

The U.S. Department of Energy's Enhanced Geothermal System (EGS) Collab project aims to improve our understanding of hydraulic stimulations in crystalline rock for enhanced geothermal energy production through execution of intensely monitored meso-scale experiments. The first experiment is being performed at the 4850 ft level of the Sanford Underground Research Facility (SURF), approximately 1.5 km below the surface at Lead, South Dakota. Here we report on microseismic monitoring of repeated stimulation experiments and subsequent flow tests between two boreholes in the Poorman Formation. Stimulations were performed at several locations in the designated injection borehole at flow rates from 0.1 to 5 L/min over temporal durations from minutes to hours. Microseismic monitoring was performed using a dense 3D sensor array including two cemented hydrophone strings with 12 sensors at 1.75 m spacing accompanied by 18 3-C accelerometers, deployed in 6 monitoring boreholes, completely surrounding the stimulation region. Continuous records were obtained over a two-month period using a novel dual recording system consisting of a conventional 96 channel exploration seismograph and a high-performance 64 channel digitizer sampling sensors at 4 and 100 kHz respectively. Using a standard STA/LTA triggering algorithm, we detected thousands of microseismic events with recorded energy in a frequencymore » range generally above 3 kHz and up to 40 kHz. The locations of these events are consistent with creation of a hydraulic fracture and additional reactivation of pre-existing structures. Using manual pick refinement and double-difference relocation we are able to track the fracture growth to high precision. We estimate the times and locations of the fracture intersecting a monitoring and the production borehole using microseismic events. They are in excellent agreement with independent measurements using distributed temperature sensing, in-situ strain observations and measurements of conductivity changes. This submission includes a microearthquake catalog, raw event files, a subset of the continuous microseismic monitoring data collected during stimulations and flow test activity on 05/22/2018, 05/23/2018, 05/24/2018, 05/25/2018, 06/25/2018, 07/19/2018, 07/20/2018, 12/7/2018, 12/20/2018, and 12/21/2018 (in binary format), and a binary file interpreter to read the continuous microseismic monitoring data. A Stanford Geothermal Workshop paper is also included to describe microseismic monitoring activities at SURF during these periods.« less

Authors:
ORCiD logo ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Other Number(s):
1166
DOE Contract Number:  
EE0032708
Product Type:
Dataset
Research Org.:
USDOE Geothermal Data Repository (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Program (EE-4G)
Subject:
15 Geothermal Energy
Keywords:
geothermal; energy; EGS Collab; SURF; hydraulic; fracturing; stimulation; Sanford Underground Research Facility; experiment; EGS; microseismic monitoring; meso-scale stimulations; Sandford Underground Research; mesoscale experiments; crystalline rock; 3D sensor; Lead; South Dakota; STA/LTA triggering algorithm; microseismicity; catalog; raw data; processed data; binary file interpreter; Python; geospatial data
OSTI Identifier:
1557417
DOI:
https://doi.org/10.15121/1557417

Citation Formats

Schoenball, Martin, Ajo-Franklin, Jonathan, Robertson, Michelle, Wood, Todd, Blankenship, Doug, Cook, Paul, Dobson, Patrick, Guglielmi, Yves, Fu, Pengcheng, Kneafsey, Timothy, Knox, Hunter, Petrov, Petr, Schwering, Paul, Rempleton, Dennise, Ulrich, Craig, Li, Jiaxuan, Huang, Lianjie, Chi, Benxin, Hopp, Chet, and EGS Collab Team, The. EGS Collab Experiment 1: Microseismic Monitoring. United States: N. p., 2019. Web. doi:10.15121/1557417.
Schoenball, Martin, Ajo-Franklin, Jonathan, Robertson, Michelle, Wood, Todd, Blankenship, Doug, Cook, Paul, Dobson, Patrick, Guglielmi, Yves, Fu, Pengcheng, Kneafsey, Timothy, Knox, Hunter, Petrov, Petr, Schwering, Paul, Rempleton, Dennise, Ulrich, Craig, Li, Jiaxuan, Huang, Lianjie, Chi, Benxin, Hopp, Chet, & EGS Collab Team, The. EGS Collab Experiment 1: Microseismic Monitoring. United States. doi:https://doi.org/10.15121/1557417
Schoenball, Martin, Ajo-Franklin, Jonathan, Robertson, Michelle, Wood, Todd, Blankenship, Doug, Cook, Paul, Dobson, Patrick, Guglielmi, Yves, Fu, Pengcheng, Kneafsey, Timothy, Knox, Hunter, Petrov, Petr, Schwering, Paul, Rempleton, Dennise, Ulrich, Craig, Li, Jiaxuan, Huang, Lianjie, Chi, Benxin, Hopp, Chet, and EGS Collab Team, The. 2019. "EGS Collab Experiment 1: Microseismic Monitoring". United States. doi:https://doi.org/10.15121/1557417. https://www.osti.gov/servlets/purl/1557417. Pub date:Mon Jul 29 00:00:00 EDT 2019
@article{osti_1557417,
title = {EGS Collab Experiment 1: Microseismic Monitoring},
author = {Schoenball, Martin and Ajo-Franklin, Jonathan and Robertson, Michelle and Wood, Todd and Blankenship, Doug and Cook, Paul and Dobson, Patrick and Guglielmi, Yves and Fu, Pengcheng and Kneafsey, Timothy and Knox, Hunter and Petrov, Petr and Schwering, Paul and Rempleton, Dennise and Ulrich, Craig and Li, Jiaxuan and Huang, Lianjie and Chi, Benxin and Hopp, Chet and EGS Collab Team, The},
abstractNote = {The U.S. Department of Energy's Enhanced Geothermal System (EGS) Collab project aims to improve our understanding of hydraulic stimulations in crystalline rock for enhanced geothermal energy production through execution of intensely monitored meso-scale experiments. The first experiment is being performed at the 4850 ft level of the Sanford Underground Research Facility (SURF), approximately 1.5 km below the surface at Lead, South Dakota. Here we report on microseismic monitoring of repeated stimulation experiments and subsequent flow tests between two boreholes in the Poorman Formation. Stimulations were performed at several locations in the designated injection borehole at flow rates from 0.1 to 5 L/min over temporal durations from minutes to hours. Microseismic monitoring was performed using a dense 3D sensor array including two cemented hydrophone strings with 12 sensors at 1.75 m spacing accompanied by 18 3-C accelerometers, deployed in 6 monitoring boreholes, completely surrounding the stimulation region. Continuous records were obtained over a two-month period using a novel dual recording system consisting of a conventional 96 channel exploration seismograph and a high-performance 64 channel digitizer sampling sensors at 4 and 100 kHz respectively. Using a standard STA/LTA triggering algorithm, we detected thousands of microseismic events with recorded energy in a frequency range generally above 3 kHz and up to 40 kHz. The locations of these events are consistent with creation of a hydraulic fracture and additional reactivation of pre-existing structures. Using manual pick refinement and double-difference relocation we are able to track the fracture growth to high precision. We estimate the times and locations of the fracture intersecting a monitoring and the production borehole using microseismic events. They are in excellent agreement with independent measurements using distributed temperature sensing, in-situ strain observations and measurements of conductivity changes. This submission includes a microearthquake catalog, raw event files, a subset of the continuous microseismic monitoring data collected during stimulations and flow test activity on 05/22/2018, 05/23/2018, 05/24/2018, 05/25/2018, 06/25/2018, 07/19/2018, 07/20/2018, 12/7/2018, 12/20/2018, and 12/21/2018 (in binary format), and a binary file interpreter to read the continuous microseismic monitoring data. A Stanford Geothermal Workshop paper is also included to describe microseismic monitoring activities at SURF during these periods.},
doi = {10.15121/1557417},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {7}
}