EGS Collab Experiment 1: Microseismic Monitoring

Description

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.

Resources

Name Format Description Link
2018-05-22.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-05-22 in binary format Open resource
2018-05-23_1.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-05-23, part 1 of 2 in binary format Open resource
20180523_02.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-05-23, part 2 of 2 in binary format Open resource
20180524.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-05-24 in binary format Open resource
20180525_01.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-05-25, part 1 of 3 in binary format Open resource
20180525_02.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-05-25, part 2 of 3 in binary format Open resource
20180525_03.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-05-25, part 3 of 3 in binary format Open resource
20180625_01.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-06-25, part 1 of 5 in binary format Open resource
20180625_02.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-06-25, part 2 of 5 in binary format Open resource
20180625_03.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-06-25, part 3 of 5 in binary format Open resource
20180625_04.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-06-25, part 4 of 5 in binary format Open resource
20180625_05.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-06-25, part 5 of 5 in binary format Open resource
20180719_01.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-19, part 1 of 4 in binary format Open resource
20180719_02.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-19, part 2 of 4 in binary format Open resource
20180719_03.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-19, part 3 of 4 in binary format Open resource
20180719_04.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-19, part 4 of 4 in binary format Open resource
20180720_01.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 1 of 10 in binary format Open resource
20180720_02.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 2 of 10 in binary format Open resource
20180720_03.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 3 of 10 in binary format Open resource
20180720_04.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 4 of 10 in binary format Open resource
20180720_05.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 5 of 10 in binary format Open resource
20180720_06.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 6 of 10 in binary format Open resource
20180720_07.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 7 of 10 in binary format Open resource
20180720_08.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 8 of 10 in binary format Open resource
20180720_09.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 9 of 10 in binary format Open resource
20180720_10.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-07-20, part 10 of 10 in binary format Open resource
20181207.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-07 in binary format Open resource
20181220_01.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-20, part 1 of 5 in binary format Open resource
20181220_02.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-20, part 2 of 5 in binary format Open resource
20181220_03.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-20, part 3 of 5 in binary format Open resource
20181220_04.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-20, part 4 of 5 in binary format Open resource
20181220_05.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-20, part 5 of 5 in binary format Open resource
20181221_01.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-21, part 1 of 5 in binary format Open resource
20181221_02.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-21, part 2 of 5 in binary format Open resource
20181221_03.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-21, part 3 of 5 in binary format Open resource
20181221_04.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-21, part 4 of 5 in binary format Open resource
20181221_05.tar.gz G-Zipped Continuous microseismic monitoring data from stimulations and flow tests performed on the notch at 164 ft on 2018-12-21, part 5 of 5 in binary format Open resource
Microearthquake catalog.csv CSV ***OUTDATED - See "Updated Microearthquake Catalog.csv" for most recent version of the catalog*** Open resource
Updated Microearthquake Catalog.csv CSV Microearthquake catalog, updated in August, 2024. This file includes event times, locations, relative magnitudes, and other statistical information related to each detected microearthquake. Open resource
Binary File Interpreter.py Unknown Python code for reading binary microseismic monitoring files contained in archives Open resource
Methodology used to Determine Accelerometers 3-C Orientations.pdf PDF Document describing the methodology used to determine the accelerometers' three-component (3-C) orientations at the first aEGS Collab testbed using CASSM data and hodogram analysis. Open resource
Event files Raw.zip ZIP Triggered event files, 0.11 s long each Open resource
Event Files Raw.tar TAR Triggered event files, 0.03 s long each Open resource
Microseismic monitoring of meso-scale stimulations for the DOE EGS Collab project at the Sanford Underground Research Facility.pdf PDF Paper describing the monitoring and initial interpretation. Open resource
Station Coordinates.txt Text Station locations in the local coordinate system Open resource
EGS Collab Testbed-1 Well Locations and Orientations HTML Link to a separate GDR submission containing well locations and orientations at EGS Collab Teastbed 1 Open resource

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