Velocity model described in the PhD thesis of N. Cuenot, used to calculate location of microseismic events of his second catalogue of the 2000 episode at Soultz-sous-Forêts. N. Cuenot used a local tomographic method to get more precise locations for his second catalogue as part of his PhD. The distributed velocity model is the input 1-D layered model required for the tomographic calculations. The second catalogue of events of the 2000 episode calculated by N. Cuenot using tomographic inversion is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2000-Catalogue_Cuenot_2). Last update of data: 04/06/2021

Velocity model and station corrections described in the PhD thesis of <b>N. Cuenot</b>, used to calculate location of microseismic events of his first catalogue of the 2000 stimulation episode at Soultz-sous-Forêts. N. Cuenot performed preliminary locations during his PhD using a modified version of the HYPOINVERSE program (Klein, 1978). An initial velocity model established by Darnet (2000) was first used but did not give satisfactory results. The velocity model was thus refined. P waves velocities were iteratively calculated by minimizing residual errors at the stations. The ratio Vp/Vs was similarly adjusted in the sedimentary layers. At least, station corrections were used to get hypocenters as precise as possible. The first catalogue of events of the 2000 episode calculated by N. Cuenot using the HYPOINVERSE program is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2000-catalogue). Last update of data: 26/11/2018

Velocity model described in J. Helm thesis (p.127) according to Beauce et al. (1991). The velocity model was used to calculate location of microseismic events from the surface network during 1993 stimulation. The catalogue of events located during 1993 stimulation using the surface network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS1993-catalogue_Helm). Last update of data: 26/07/2019

Velocity model used by M. Calò and C. Dorbath. The velocity was derived from sonic logs operated by Schlumberger in GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1) and from transit times for shots fired inside GPK1 at different levels and recorded on the IMRG downhole network (Beauce et al., 1991). The catalogue of events located during 2003 stimulation using the downhole and the surface network is available here (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2003-catalogue). Last update of data: 18/09/2019

During February/March 2005 a hydraulic stimulation program was conducted in the well GPK4 (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSF-GPK4) at European Hot Dry Rock Project, Soultz-sous-Forêts, France. It is the second stimulation of GPK4, after the previous one, performed in September 2004. The hydraulic stimulation was followed a few days later by a program of chemical stimulation (injection of diluted HCl). This program involved the chemical stimulation itself and two identical step-rate injection tests. The first injection test was performed before the chemical stimulation and the second after, in order to observe the efficiency of the chemical stimulation. Dates of the 2005 hydraulic programme: - Second hydraulic stimulation of GPK4: from 18:05 07/02/2005 to 18:00 11/02/2005. - First step-rate injection test of GPK4: from 15:30 22/02/2005 to 15:30 25/02/2005. - Chemical stimulation of GPK4 with HCl: from 13:30 02/03/2005 to 06:00 05/03/2005. - Second step-rate injection test of GPK4: from 10:00 13/03/2005 to 09:55 16/03/2005. The Episode contains several datasets which you can find further down the page in "Links".

The 2004 stimulation was aimed at improving the hydraulic performances of the well GPK4 (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSF-GPK4). This borehole was stimulated twice. The 2004 episode corresponds to the first stimulation of GPK4. 9300 m3 of water were injected during the test at a constant flowrate of 30 l/s, with peaks up to 45 l/s. A low flow injection test of GPK4 was performed before the stimulation to evaluate the initial injectivity of the well. The data from the injection test are included too. Dates of the 2004 hydraulic programme: - GPK4 low flow injection: from 10:38 08/09/2004 to 10:00 12/09/2004. - GPK4 stimulation: from 08:32 13/09/2004 to 20:00 16/09/2004. The Episode contains the following datasets: - Microseismic catalogue of the downhole network by B.C. Dyer - Soultz-sous-Forêts 2004 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2004-Catalogue_downhole); - Microseismic downhole network - Soultz-sous-Forêts 2004 and 2005 Stimulations (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2004-Downhole_network); - Seismological waveforms - Soultz-sous-Forêts 2004 Stimulations (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2004-Waveforms); - Hydraulic data - Soultz-sous-Forêts 2004 Stimulation (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2004-Hydraulic); - Velocity model and station corrections used by B.C. Dyer to locate seismic events recorded by the downhole network - Soultz-sous-Forêts 2004 and 2005 Episodes (https://cdgp.u-strasbg.fr/geonetwork/srv/eng/catalog.search#/metadata/SSFS2004-velocity_model_downhole);

Interval seismic velocities applied to the 3D velocity model. Vp, Vs and Vp/Vs values for each formation along GRT-1 well. Original data from Maurer et al., 2020

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

Velocity model described in B. Dyer's report. Used in particular to calculate location of microseismic events from the downhole network during 2004 and 2005 stimulation. The catalogue of events located during 2004 stimulation using both the downhole network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2004-catalogue_downhole). The catalogue of events located during 2005 stimulation using both the downhole network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2005-catalogue_downhole).

Velocity model and static station corrections described in B. Dyer's report [see part 1.5.3 Velocity model and station corrections]. The velocity model was derived from a combination of the GPK1 (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSF-GPK1) check shot survey velocities and the velocity gradient interpreted from the GPK1 sonic logs. The station corrections were refined from initial station corrections by removing any bias between the model traveltimes and the picked P and S wave arrivals (Dyer, B. 2001.Soultz GPK2 Stimulation June/July 2000. Seismic Monitoring Report. Semore Seismic report for Socomine). The catalogue of events located by B. Dyer using the downhole network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2000-Catalogue_downhole). The catalogue of events located by B. Dyer using the surface network is available (https://cdgp.u-strasbg.fr/geonetwork/srv/fre/catalog.search#/metadata/SSFS2000-Catalogue_surface_Dyer). Last update of data: 26/11/2018