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Multimethod exploration of the hydrothermal reservoir in Bad Soden-Salmünster, Germany

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The Spessart Spa at Bad Soden-Salmünster extracts carbon dioxide bearing thermal brine from three wells. To utilise the thermal brine for balneology in the spa it is necessary to heat the brine, given that the maximum temperature is "only" 23.7 °C. The management of the spa intends to lower financial expenses by increasing the utilisation of renewable energies. This has led to the investigations presented here, focussing on whether hotter brine could be produced by deepen- ing existing wells or drilling new deeper wells. Additionally, optional heat supply from shallow geothermal systems is ex- amined. The wells of Bad Soden-Salmünster are the deepest drill holes in the region reaching a depth of 539 m. Since there are nei- ther deeper wells nor available geophysical exploration data, predicting the geological structure of the deeper underground is a challenging aspect of this exploration. Therefore, a multimethod approach has been chosen here. Firstly, a combination of historical data and new measurements is used to discuss origin and genesis of the thermal brine. Secondly, using literature data and an outcrop analogue study, the geological units beneath Bad Soden-Salmünster are predicted and assigned petro-physical properties. Thirdly, the open-flow potential of the used wells and data from pumping tests are evaluated. Finally, the geothermal potential of the reservoir at Bad Soden-Salmünster is estimated. The chosen multimethod approach is shown to provide a comparatively quick and cost efficient option for establishing a reliable database that enables geothermal explo- ration decisions as well as future simulations of different geothermal utilisation scenarios.
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Document Type: Research Article

Publication date: September 1, 2018

This article was made available online on August 7, 2018 as a Fast Track article with title: "Multimethod exploration of the hydrothermal reservoir in Bad Soden-Salmünster, Germany".

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  • Zeitschrift der Deutschen Gesellschaft für Geowissenschaften (ZDGG) is an international peer reviewed journal that accepts papers on research and applied topics in the Earth Sciences. It is published online and in print. One volume, consisting of four issues is published annually. The journal is continously published by the German Geological Society since its foundation in 1848. It was relaunched in 2005.

    ZDGG invites the submission of English, German and French language papers from all fields of geology, hydrogeology, paleontology, tectonics, sedimentology, engineering geology and of course environmental geology to name a few. The editors of ZDGG also invite suggestions for thematic issues.
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