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Temperature Gradient Anomalies in the Buntsandstein Sandstone Reservoir, Upper Rhine Graben, Soultz, FranceNormal access

Authors: S. Haffen, Y. Geraud, M. Diraison, C. Dezayes, D. Siffert and M.H. Garcia
Event name: 76th EAGE Conference and Exhibition 2014
Session: Reservoir Characterization - Case Studies
Publication date: 16 June 2014
DOI: 10.3997/2214-4609.20140661
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 690.9Kb )
Price: € 20

The geothermal reservoir at Soultz-sous-Forêts is targeted in a granite horst bounded by subvertical normal faults. Exploration and production results tend to show that the Buntsandstein formation, made of inter-bedded sandstones and argillite in the Rhine Graben, above the granitic basement, may also have geothermal potential. Indeed, temperature gradient anomalies observed in the Buntsandstein indicate that the Buntsandstein could be exploited to produce heat or even electricity. In order to determine the fluid flow pattern within the sandstone formation, we compare two temperature gradient logs: on the one hand, the observed gradient log derived from temperatures measured along a borehole, on the other hand, a calculated one based on thermal conductivities measured on borehole cores. The observe temperatures gradients anomalies, could be explained by fluid flow patterns, thus phenomenological study has been carried out using TOUGH2 to simulate fluid flow and heat transfer for various boundary conditions. These results allow building a conceptual model (980-1400 m) of the sedimentary reservoir above the granitic basement at Soultz-sous-Forêt.

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