Episode: 1995 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Collection

The 1995 hydraulic program tested GPK‑2 and its ability to circulate with GPK‑1. After low injectivity was confirmed, short‑ and long‑term stimulations were performed, followed by post‑fracturing tests and three brief circulation experiments between the two wells.

Soultz-sous-Forêts

June 11, 1995 - Aug. 20, 1995

Injection test / Hydraulic Stimulation / Circulation Test

Last updated on July 23, 2026

Episode: 1993 Stimulation Soultz-sous-Forêts

Collection

During the 1993 program, GPK‑1 was deepened to 3590 m and subjected to large‑scale hydraulic stimulations to investigate major natural fractures. Across two main tests injecting a total of 44 000 m³ of water, about 18 700 microseismic events were detected, with activity monitored by both downhole and surface networks.

Soultz-sous-Forêts

Sept. 2, 1993 - Oct. 26, 1993

Hydraulic Stimulation

Last updated on July 23, 2026

Episode: 2003 Stimulation Soultz-sous-Forêts

Collection

The May–July 2003 hydraulic programme at GPK‑3 involved an 11‑day deep stimulation injecting 34 000 m³ of water (including an initial 450 m³ brine slug), followed by a 17‑day post‑stimulation circulation test between GPK‑3 and GPK‑2. Microseismic monitoring continued throughout the operations until late August, capturing the system’s response across five distinct hydraulic phases.

Soultz-sous-Forêts

May 27, 2003 - July 28, 2003

Hydraulic Stimulation / Circulation Test

Last updated on June 24, 2026

Episode: 2004 Stimulation Soultz-sous-Forêts

Collection

The 2004 programme consisted of a low‑flow injectivity test followed by the first stimulation of GPK‑4, during which 9 300 m³ of water were injected at 30–45 L/s.

Soultz-sous-Forêts

Sept. 8, 2004 - Sept. 16, 2004

Hydraulic Stimulation

Last updated on June 24, 2026

Episode: 2005 Stimulation Soultz-sous-Forêts

Collection

The 2005 program included a second hydraulic stimulation of the GPK-4 well, followed a few days later by a chemical stimulation using diluted hydrochloric acid. Two injection tests with increasing flow rates, one before and one after the acid treatment.

Soultz-sous-Forêts

Feb. 7, 2005 - March 16, 2005

Hydraulic Stimulation

Last updated on June 24, 2026

Episode: 2010 Circulation Soultz-sous-Forêts

Collection

The 2010 circulation test ran from November 2009 to October 2010, making it the longest continuous circulation experiment at Soultz. During this period, GPK2 produced while GPK3 and GPK1 served as reinjection wells.

Soultz-sous-Forêts

Jan. 3, 2010 - Oct. 29, 2010

Hydraulic Stimulation

Last updated on June 24, 2026

Episode: ECOGI geothermal project at Rittershoffen - development phase

Collection

The ECOGI geothermal plant in Rittershoffen has operated since 2016, supplying 24 MWth of heat at 170 °C to a nearby biorefinery. Its development (2012–2014) involved drilling GRT‑1 and GRT‑2, during which induced seismicity was recorded by permanent and temporary networks.

Soultz-sous-Forêts

Nov. 29, 2012 - May 26, 2014

Production test / Hydraulic Stimulation / Circulation Test and more...

Last updated on June 24, 2026

Episode: 1996 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Collection

The 1996 hydraulic programme at GPK‑2 included a production test, a major re‑stimulation injecting 28 000 m³ at rates up to 78 L/s, a stepped injectivity test, and two short circulation experiments between GPK‑2 and GPK‑1. Around 7 500 microseismic events were detected, with about 5 700 successfully located.

Soultz-sous-Forêts

Aug. 14, 1996 - Oct. 30, 1996

Production test / Hydraulic Stimulation / Stepped Injection Test

Last updated on June 22, 2026

Episode: 2000 Stimulation Soultz-sous-Forêts

Collection

The June–July 2000 hydraulic programme at GPK‑2 involved a six‑day deep stimulation over the 4431–5084 m openhole interval, injecting 27 800 m³ of water including an initial 700 m³ brine slug to promote downward fracture growth. After a one‑week pause, a post‑stimulation injection test was performed, followed by 11 days of continued seismic monitoring.

Soultz-sous-Forêts

June 30, 2000 - July 15, 2000

Hydraulic Stimulation

Last updated on June 22, 2026

Episode: 1991 Stimulation Soultz-sous-Forêts

Collection

During the 1991 episode, two 50‑hour injection tests were performed in GPK‑1 at 7 and 15 L/s, generating significant induced seismicity. A network of CSM accelerometer probes and hydrophones in nearby wells detected over 400 events, about 60% of which were successfully located.

Soultz-sous-Forêts

1991

Hydraulic Stimulation

Last updated on June 16, 2026

Velocity model and static corrections used by N. Cuenot to locate seismic events acquired from the downhole and surface network - Soultz-sous-Forêts 2000 Stimulation

Dataset in collection Episode: 2000 Stimulation Soultz-sous-Forêts

Velocity models from Cuenot’s thesis were built from GPK1 sonic logs and calibration shots, first as an initial model for preliminary locations, then refined into the final model.

Soultz-sous-Forêts

2000

Model

Last updated on July 1, 2026

Catalogue with hydraulic data from Drif et al.(2024)- Soultz-sous-Forêts 1995 Stimulation

Dataset in collection Episode: 1995 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Hourly catalogue of the 1995 Soultz injection, tracking injected flow/volume/energy and the seismic response (event depth, seismic moment, radiated and faulting energy) to quantify how hydraulic energy converts into seismic energy.

Soultz-sous-Forêts

1995

Hydraulic

Last updated on June 15, 2026

Microseismic catalogue with seismic moment and moment magnitude from Drif et al.(2024) - Soultz-sous-Forêts 1995 Stimulation

Dataset in collection Episode: 1995 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Microseismic catalogue of the 1995 Soultz‑sous‑Forêts stimulation, listing all events with location, CSMA moment magnitude, and recalculated seismic moment and moment magnitude. It is derived from the CSMA 1995 downhole network catalogue and reprocessed following Drif et al. (2024).

Soultz-sous-Forêts

June 14, 1995 - June 29, 1995

Seismology

Last updated on June 15, 2026

Flow logs - Soultz-sous-Forêts 1996 Stimulation and Hydraulic Tests

Dataset in collection Episode: 1996 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Flow logs from GPK1 and GPK2 were recorded during the 1996 Soultz‑sous‑Forêts hydraulic programme, documenting depth‑dependent flow profiles (depth in m, flow in L/s) over multiple injection and circulation phases. Each file header contains the detailed acquisition parameters.

Soultz-sous-Forêts

Sept. 19, 1996 - Oct. 19, 1996

geophysics

Last updated on June 15, 2026

Hydraulic data - Soultz-sous-Forêts 1996 Stimulation and Hydraulic Tests

Dataset in collection Episode: 1996 Stimulation and Hydraulic Tests Soultz-sous-Forêts

Hydraulic data from GPK2, GPK1, and EPS1 were recorded during the 1996 Soultz‑sous‑Forêts hydraulic programme, covering production, stimulation, stepped‑injection, and two circulation tests. Five datasets document wellhead pressure, flowrate, temperature, and related hydraulic parameters, with full metadata provided in each file header.

Soultz-sous-Forêts

Aug. 14, 1996 - Oct. 30, 1996

Hydraulic

Last updated on June 15, 2026