GPK2 was the third well drilled for geothermal purposes at Soultz-sous-Forêts after GPK1 and EPS1. The well has been drilled southern to GPK1. It constitutes the second well of the doublet and obtains a maximum of fluid recovery. GPK2 well reached 3900 m in 1995 by drilling in destructive mode only. Hydraulic tests have been done to characterize the exchanger and to evaluate the potential fluid flow. In 1999, it was decided to exploit a lower level at 5000 m depth, where the temperature reaches 200°C in order to develop a geothermal resource aiming at electricity production? GPK2 was then extended to 5084 m. Location GPK2 WGS84: Latitude: 48.9308924 | 48° 55' 51'' N Longitude: 7.86662988 | 7° 51' 59'' E

GPK1 was the first well drilled for geothermal purposes at Soultz-sous-Forêts. The well was first drilled in 1987. It reached 2000 m and the temperature at the bottom hole was 140°C. Several hydraulic injections have been done associated with tracer tests and temperature and flow logs. In order to get deeper information, the GPK1 well was deepened to 3600 m in 1992. The downhole temperature reached 160°C. Location GPK1 WGS84: Latitude: 48.93525543 | 48° 56' 6'' N Longitude: 7.86535117 | 7° 51' 55'' E

VSP acquired in EPS1 and GPK1 wells from May 3-5, 1993. Sources: P and S vibrators at several locations: A2, A3, B1, B2, C3, C4, D1, D2. Run1: P@A3/EPS1, P@C3/GPK1, S-NS@A2/GPK1, S-EW@A2/GPK1 Run 2: P@C3/GPK1, P@A3/EPS1, S-NS@C4/EPS1, S-EW@C4/EPS1 Run 3: P@B2, S-NS@B1, S-EW@B1 Run 4: P@D1, S-NS@D2, S-EW@D2

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

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

GPK3 well was drilled after GPK2 well in order to exploit a lower level at 5000 m depth, where the temperature reaches 200°C. GPK3 has been drilled in 2002 to build a triplet exchanger along ith GPK2 and GPK4 wells. It reaches a depth of 5090 m. Location GPK3 WGS84: Latitude: 48.93084122 | 48° 55' 51'' N Longitude: 7.86656943 | 7° 51' 59'' E

Velocity models described in Nicolas Cuenot's Thesis, used to calculate location of microseismic events from the surface and the downhole network during 2000 stimulation. A first initial model was derived from sonic logs and calibration shots in the well GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1) and used to perform a preliminary location of hypocenters. The initial model was refined into the final velocity model. The catalogue from Cuenot was obtained by applying the static station corrections with the final velocity model. The catalogue of events located during 2000 stimulation using both the surface and downhole network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2000-catalogue). Last update of data: 26/11/2018

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),GPK3 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK3), GPK4 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK4) and EPS1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-EPS1) during the 2005 GPK4 hydraulic stimulation program. Time period: 07/02/2005 13:51:26 - 03/04/2005 02:02:10 (UTC). The data parameters are the following: Column 1: Experiment test Column 2: Date and time (UTC) Column 3: Qin_omega - GPK4 injection flowrate Column 4: Vin - Cumulative volume of injected fluid Column 5: Tin_omega - Temperature of injected fluid Column 6: WL_Tank - Water level in the tank * Column 7: P_Tank - Pressure in the tank * Column 8: Rho_Tank - Density of injected fluid Column 9: Pw3 - GPK3 wellhead pressure Column 10: Pan3 - GPK3 annulus pressure Column 11: Pw2 - GPK2 wellhead pressure Column 12: Pan2 - GPK2 annulus pressure Column 13: Pw4 - GPK4 wellhead pressure Column 14: Pan4 - GPK4 annulus pressure Column 15: Pan_EPS1 - EPS1 annulus pressure Column 16: Pwc1 - GPK1 wellhead pressure Column 17 : Pan1 - GPK1 annulus pressure * The tank was used as a buffer for injection fluid. Last update of data: 31/10/2018

Catalogue of microseismicity recorded at Soultz-sous-Forêts during 1993 stimulation by the downhole network. This catalogue is part of Seid Bourouis Thesis: Sismicité induite et comportement mécanique d'un massif granitique fracturé par injection d'eau - Application au site géothermique de Soultz-sous-Forêts. Number of events: 15534. The data parameters used are the following: Column 1: Seismic ID Column 2: Event number Column 3: Record name Column 4: Date Column 5: Time (local) Column 6: Time (UTC) * Column 7: Easting from GPK1 wellhead Column 8: Northing from GPK1 wellhead Column 9: Depth from GPK1 wellhead Column 10: Latitude WGS84 ** Column 11: Longitude WGS84 ** Column 12: Elevation WGS84 ** * The UTC time has been calculated from the local time. ** Latitude, longitude and elevation have been derived from easting, northing and depth from GPK1 wellhead. The microseismic downhole network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1993-network). The associated waveforms are available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1993-seed). Last update of data: 23/07/2019