The Hot Dry Rock (HDR) site of Soultz-sous-Forêts in Alsace was chosen in 1986 for scientific investigations. During the first phase of the project (1987-1988), a first borehole GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1) was drilled. It reached a final depth of 2000 m and various investigations were undertaken during that period. In December 1988, an injection test was made at the bottom zone of this borehole with a relatively low flow rate of 3.3 l/s for a period of three days. Induced seismicity recorded was detected by 3-axis geophone probes deployed in three old recovered oil wells at depth ranging from 850 to 1350 m. A small amount of the detected seismicity could be located and showed a trend to grow towards greater depths than the injection zone. The following report from BRGM in the link gives details about the experiments and presents the results about the seismic monitoring and the location of the events. Some hydraulic data are presented as well with figures.

Data used to generate the figures of the paper: J. Azzola, J. Schmittbuhl, D.Zigone, V. Magnenet, and F. Masson (2017). Direct modeling of the mechanical strain influence on coda wave interferometry. Journal of Geophysical Research. Accepted article. (https://doi.org/10.1002/2017JB015162) This work has been published under the framework of the LABEX ANR-11-LABX-0050-G-EAU-THERMIE-PROFONDE and benefits from a funding from the state managed by the French National Research Agency (ANR) as part of the ‘Investments for the Future’ program. It has also been funded by the EU project DESTRESS (EU H2020 research and innovation program, grant agreement No 691728). This work is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/)

Hydraulic data recorded at GPK1, GPK2, GPK3, GPK4 and EPS1 during the 2004 hydraulic program. Two datasets are available: SSFS2004-Hydraulic_injection.csv: hydraulic data from 07/09/2004 to 12/09/2004 during the low flow injection test at GPK4 SSFS2004-Hydraulic_stimulation.csv: hydraulic data from 12/09/2004 to 02/10/2004 during the stimulation test at GPK4 The data parameters for the file SSFS2004-Hydraulic_injection.csv are the following: Column 1: Date and time (UTC) Column 2: Qin_MeSy - GPK4 injection flowrate Column 3: Vin - Cumulative volume of injected fluid Column 4: Tin_MeSy - Temperature of injected fluid Column 5: WL_Tank - Water level in the tank * Column 6: P_Tank - Pressure in the tank * Column 7: Rho_Tank - Density of injected fluid Column 8: Pw3 - GPK3 wellhead pressure Column 9: Pan3 - GPK3 annulus pressure Column 10: Pw2 - GPK2 wellhead pressure Column 11: Pan2 - GPK2 annulus pressure Column 12: Pw4 - GPK4 wellhead pressure Column 13: Pan4 - GPK4 annulus pressure Column 14: Pan_EPS1 - EPS1 annulus pressure The data parameters for the file SSFS2004-Hydraulic_stimulation.csv are the following: Column 1: Date and time (UTC) Column 2: Qin_omega - GPK4 injection flowrate Column 3: Vin - Cumulative volume of injected fluid Column 4: Qout - GPK3 production flowrate Column 5: Vout - Cumulative volume of produced fluid Column 6: Tin_omega - Temperature of injected fluid Column 7: Tout2 - Temperature of produced fluid Column 8: Tout3 - Temperature of produced fluid (other sensor) Column 9: WL_Tank - Water level in the tank * Column 10: P_Tank - Pressure in the tank * Column 11: Rho_Tank - Density of injected fluid Column 12: Pw3 - GPK3 wellhead pressure Column 13: Pan3 - GPK3 annulus pressure Column 14: Pw2 - GPK2 wellhead pressure Column 15: Pan2 - GPK2 annulus pressure Column 16: Pw4 - GPK4 wellhead pressure Column 17: Pan4 - GPK4 annulus pressure Column 18: Pan_EPS1 - EPS1 annulus pressure Column 19: Pwc1 - GPK1 wellhead pressure Column 20 : Pan1 - GPK1 annulus pressure * The tank was used as a buffer for injection fluid. Last update of data: 31/10/2018

During May/June 2003 a hydraulic stimulation program was conducted in the well GPK3 (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSF-GPK3); at the European Hot Dry Rock Project, Soultz-sous-Forêts, France. The stimulation was followed in June/July 2003 by a circulation test between GPK3 and GPK2 (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSF-GPK2). The stimulation was performed over the openhole section of GPK3 from 4556 m measured depth (MD) to the bottom of the well at around 5101 m MD. A total of 34,000 m3 of water was injected. At the start of the stimulation 450 m3 of brine were injected in an effort to encourage downward growth of the stimulated region. The stimulation covered a period of 11 days. After a break of 7 days, a post-fracturing and circulation test was performed between GPK3 and GPK2 for a period of 17 days (Dyer, B.C., Baria, R. and Michelet, S., 2004. <i>Soultz GPK3 stimulation and GPK3-GPK2 circulation May to July 2003. Seismic monitoring report</i>. Semore Seismic report for Socomine.). Microseismic emissions have been monitored and recorded throughout the experiment, and continued until August 26th. The five principle phases of the hydraulic programme were the following: - Phase 1: GPK3 injection - Phase 2: GPK3 and GPK2 injection - Phase 3: GPK3 injection and GPK2 shut-in - Phase 4a: GPK3 and GPK2 shut-in - Phase 4b: GPK3 shut-in and GPK2 venting - Phase 5: GPK3 to GPK2 circulation The Episode contains the following datasets: - Microseismic catalogue of the surface network with magnitude by M. Calò and C. Dorbath- Soultz-sous-Forêts 2003 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2003-Catalogue); - Microseismic catalogue of the downhole network by B.C. Dyer et al. - Soultz-sous-Forêts 2003 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2003-Catalogue_downhole); - Microseismic surface network - Soultz-sous-Forêts 2003 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2003-Surface_network); - Microseismic downhole network - Soultz-sous-Forêts 2003 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2003-downhole_network); - Seismological waveforms - Soultz-sous-Forêts 2003 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2003-Waveforms); - Hydraulic data - Soultz-sous-Forêts 2003 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2003-Hydraulic);

The 2010 circulation test began in November 2009 after a maintenance period and lasted until October 2010, when a new maintenance period was programmed. This 11-month experiment is the longest circulation ever performed on the Soultz project. During the test, GPK2 was used as production well (with Line Shaft Pump), GPK3 and GPK1 as reinjection wells (Cuenot, N., Genter, A., 2015. Microseismic Activity Induced During Recent Circulation Tests at the Soultz-sous-Forêts EGS Power Plant). The Episode contains several datasets which you can find further down the page in "Links".

Microseismic catalogue of the 2000 episode at Soultz-sous-Forêts calculated by B. Dyer (Semore Seismic) using the downhole network. Number of events: 13986. Microseismic monitoring of the hydraulic program at Soultz took place between June 30th and July 18th. During the program, a total of 31511 potential seismic events were recorded from which 13986 seismic events were located.The catalogue covers the two hydraulic tests realized during the 2000 episode. Only the events with an RMS misfit <10 ms were accepted. Time corresponding to the corrected waveforms distributed on the CDGP has been added. Time period: 30/06/2000 19:09:38 - 19/07/2000 07:54:17 (UTC time). The data parameters are the following: Column 1: Event number Column 2: Date (local) Column 3: Time (local) Column 4: Date (UTC) * Column 5: Time (UTC) * Column 6: Date corresponding to the corrected waveforms distributed by the CDGP (UTC) ** Column 7: Time corresponding to the corrected waveforms distributed by the CDGP (UTC) ** Column 8: Easting from GPK1 wellhead *** Column 9: Northing from GPK1 wellhead *** Column 10: Depth from GPK1 wellhead *** Column 11: Latitude WGS84 **** Column 12: Longitude WGS84 **** Column 13: Elevation WGS84 **** * The UTC time has been calculated from the local time. ** Some date and time corresponding to the corrected waveforms are missing. Discrepancies in the time were found with the waveforms for 87 events. Thus, the time corresponding to the corrected waveforms is given for 13899 events only. *** The local coordinate system is based on the UTM32 system. **** Latitude, longitude and elevation have been derived from easting, northing and depth from GPK1 wellhead. The description of the downhole network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2000-downhole_network). The seismological waveforms recorded by the downhole and the surface network during the 2000 episode are available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2000-Waveforms). Last update of data: 28/06/2021

Hydraulic data recorded at GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1), GPK2 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK2) and GPK3 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK3). Nine datasets are available: - SSFC2010-Flowrate_gpk1.csv : Injection flowrate recorded in GPK1 from 05:49:21 10/12/2009 to 23:50:00 14/10/2010. - SSFC2010-Flowrate_gpk2.csv : Production flowrate recorded at GPK2 from 23:23:51 18/11/2009 to 16:00:00 14/10/2010. - SSFC2010-Flowrate_gpk3.csv : Injection flowrate recorded in GPK3 from 00:45:42 01/12/2009 to 17:25:00 14/10/2010. - SSFC2010-Wellhead_pressure_gpk1.csv : Wellhead pressure recorded at GPK1 from 04:00:00 23/03/2010 to 23:20:00 14/10/2010. - SSFC2010-Wellhead_pressure_gpk2.csv : Wellhead pressure recorded at GPK2 from 14:34:18 19/11/2009 to 23:25:00 14/10/2010. - SSFC2010-Wellhead_pressure_gpk3.csv : Wellhead pressure recorded at GPK3 from 10:05:04 23/11/2009 to 23:55:00 24/10/2010. - SSFC2010-Temperature_gpk1.csv : Temperature recorded at GPK1 from 04:39:01 19/11/2009 to 23:55:00 14/10/2010. - SSFC2010-Temperature_gpk2.csv : Temperature recorded at GPK2 from 08:53:35 01/11/2009 to 23:00:00 14/10/2010. - SSFC2010-Temperature_gpk3.csv : Temperature recorded at GPK3 from 09:32:48 19/11/2009 to 23:55:00 14/10/2010. Due to several problems with the data acquisition system, some time periods of data are missing for all the files. Last update of data: 02/12/2019

Microseismic catalogue of the 2004 episode at Soultz-sous-Forêts calculated by B.C. Dyer using the downhole network. Number of events: 5861. The catalogue covers the GPK4 low flow injection test and the GPK4 stimulation test of the 2004 hydraulic program. The events were located by a combination of automatic and manual processing methods. Only events that could be located with an RMS misfit inferior to 5 ms were accepted in the catalogue. Time period: 08/09/2004 17:46:58 - 24/09/2004 12:19:59 (UTC time). The data parameters are the following: Column 1: Event ID Column 2: Experiment phase of the hydraulic program Column 3: Date (UTC) Column 4: Time (UTC) Column 5: Easting from GPK1 wellhead * Column 6: Northing from GPK1 wellhead * Column 7: Depth from GPK1 wellhead * Column 8: Latitude WGS84 ** Column 9: Longitude WGS84 ** Column 10: Elevation WGS84 ** Column 11: RMS Column 12: Local magnitude *** * The local coordinate system is based on the UTM32 system. ** Latitude, longitude and elevation have been derived from easting, northing and depth from GPK1 wellhead. *** The magnitude has been estimated using the relationship derived by Sophie Michelet/Matthieu Darnet based on the peak amplitude at the 4550V sensor: M = (-11 + log10 ((0.85 * PeakAmplitudeAt4550V) / 1.0e-9)) * 1.85. Last update of data: 03/03/2022

In 1990/1991, an old oil well, EPS1 has been deepened and cored to characterize the granite reservoir and perform some deep hydraulic tests in view of a future experimental doublet. Unfortunately, the well had an important not controlled deviation and could not reach the expected depth. However, it was cored from 930 m to the bottom hole at 2227 m depth and provided a lot of scientific data. Location EPS1 WGS84: Latitude: 48.93118507 | 48° 55' 52'' N Longitude: 7.86766157 | 7° 52' 3'' E

VSP acquired in EPS1 and GPK1 wells from September 15-17, 1993. Sources: P and S vibrators at several locations: A, D, E Run1: P@E/EPS1, S@E/GPK1 Run 2: P@D/EPS1, S@D/EPS1 Run 3: P@D/GPK1, S@D/GPK1 Run 4: P@D/GPK1, S-NS@A/GPK1, S-EW@A/GPK1, P@A/GPK1