Evaluation of Hydraulic Tests at Soultz-Sous-forets, European HDR-Site
- Key words
- hot-dry-rock, hydraulic fracturing, hydraulic testing
- Location
- Soultz-sous-Forets, France
- Conference
- World Geothermal Congress
- Year
- 1995
- Session
- SECTION 12 - Advanced Technologies (HDR - Magma - Geopressur
- Language
- English
- Paper number
- 4-Jung
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Abstract
Two massive hydraulic fracturing tests were performed in the 3600 m deep borehole GPKl in low permeable granite at rock temperatures up to 160 A large ( NW-SE trending vertical fracture system was created by injecting 45,000 of water. The fracture system was found to be connected to a natural reservoir of hot brine (nearby fault or fracture zone). This hydraulic link can contribute considerably to the production flow in a titure HDR circulation loop but carries also the risk of high fluid losses ifthe loop is operated at elavated pressure.
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