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

Description

A series of hydraulic tests were performed from August to October 1996 at the GPK2 well. First a production test was conducted in August to determine the productivity of the well. The production test was followed by a second stimulation of GPK2 after the previous one in 1995. The open hole section of the well was re-stimulated at flowrates up to 78 l/s. A total of 28000 m3 of fluid was injected during the test. The stimulation was followed by a stepped injection test to determine the injectivity of the well after the stimulation. Finally, two circulation tests during which the water produced from GPK2 was reinjected in GPK1 were performed in October 1996. About 7500 microseismic events were detected during the experiments, and about 5700 were located.

Dates of the different tests of the 1996 hydraulic programme:
- Production test at GPK2: from 09:20 14/08/96 to 03:40 15/08/96
- Stimulation test at GPK2: from 16:30 18/09/96 to 22:15 25/09/96
- Stepped injection test at GPK2: from 10:30 29/09/96 to 04:00 06/10/96
- First circulation test between GPK2 and GPK1: from 10:04 12/10/96 to 12:09 20/10/96
- Second circulation test between GPK2 and GPK1: from 15:30 28/10/96 to 19:10 30/10/96

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

Dataset

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.

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

Dataset

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.

Microseismic catalogue with moment magnitude of the downhole network from CSMA - Soultz-sous-Forêts 1996 Stimulation

Dataset

Microseismic catalogue of 3464 events recorded by the downhole network during the 1996 Soultz‑sous‑Forêts stimulation. The dataset covers only the stimulation phase and a few days after, with almost no events at low flow rates and a strong increase in seismicity during the 78 L/s injection stage.

Microseismic downhole network - Soultz-sous-Forêts 1996 Stimulation and Hydraulic Tests

Dataset

In 1996, three CSMA 4‑component accelerometers (in wells 4550, 4601, 4616) and one hydrophone (in EPS1) were deployed for the Soultz microseismic network. Sensors were not grouted.

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

Dataset

Temperature logs from GPK1 and GPK2 were recorded during the 1996 Soultz‑sous‑Forêts hydraulic programme, documenting depth‑dependent temperature profiles (depth in meters, temperature in °C). Measurements were acquired on multiple dates in September–October 1996, with full acquisition details provided in each file header.

Catalogue with hydraulic data from Drif et al.(2024)- Soultz-sous-Forêts 1996 Stimulation

Dataset

Hourly hydraulic–seismic catalogue for the 1996 Soultz stimulation, starting 18/09/1996 12:00. It reports flowrate, injected volume, hydraulic energy, and the corresponding seismic response (event depth, cumulative moment, radiated and faulting energies) to evaluate how injected hydraulic energy converts into seismic energy, following Drif et al. (2024).

Microseismic catalogue with seismic moment and moment magnitude from Drif et al.(2024) - Soultz-sous-Forêts 1996 Stimulation

Dataset

Microseismic catalogue of the 1996 Soultz‑sous‑Forêts stimulation, listing events with location, CSMA moment magnitude, and recalculated seismic moment and moment magnitude. The dataset is derived from the CSMA 1996 downhole catalogue and reprocessed following Drif et al. (2024).

Geological sections from GeORG- Soultz-sous-Forêts

Dataset

The GeORG project (2008–2012) built a 3D geological model of the Upper Rhine Graben, providing a full geoscientific database with maps, temperature models, and geological cross‑sections.

Petrophysical properties - Soultz-sous-Forêts

Dataset

This dataset compiles petrophysical properties of Soultz‑sous‑Forêts geothermal samples, gathered by Prof. Michael J. Heap from published studies. It includes lithology, depth, fractures, porosity, velocities, permeability, mechanical properties, and the reference for each sample.

GeORG 3D Geological Model—Soultz-sous-Forêts

Dataset

The GeORG project provides a 3D geological model of the Upper Rhine Graben. The BRGM distributes the French section, from which a 10 km cut‑out around Soultz‑sous‑Forêts was extracted, including major lithological interfaces and faults.

GPK1 well

Dataset

GPK1, drilled in 1987 as the first geothermal well at Soultz‑sous‑Forêts, initially reached 2000 m (140 °C) before being deepened to 3600 m in 1992 (160 °C).

GPK2 well

Dataset

GPK2, drilled south of GPK1, was the third geothermal well at Soultz. Initially completed to 3900 m in 1995, it was later deepened to 5084 m to reach the ~200 °C reservoir for power production.

Stakeholders

Creator(s)

École & Observatoire des Sciences de la Terre