TRACE: a multi-tracer analysis of shallow aquifers to improve geothermal potential assessment

The assessment of geothermal potential for deep - geothermal energy production currently relies on expensive - 3D reflexion seismic methods to identify adequate fault zones - and geometry of the geothermal aquifer. However, this - analysis does not allow the estimation of hydraulic - permeability of...

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Hauptverfasser: Freundt, Florian (VerfasserIn) , Al Najem, Sami (VerfasserIn) , Aeschbach, Werner (VerfasserIn) , Isenbeck-Schröter, Margot (VerfasserIn) , Kober, Bernd (VerfasserIn) , Kraml, Michael (VerfasserIn) , Grobe, Rene (VerfasserIn) , Wenke, Axel (VerfasserIn)
Dokumenttyp: Article (Journal) Konferenzschrift
Sprache:Englisch
Veröffentlicht: August 28, 2013
In: The Mineralogical Magazine and Journal of the Mineralogical Society of Great Britain and Ireland
Year: 2013, Jahrgang: 77
ISSN:2515-821X
DOI:https://doi.org/10.1180/minmag.2013.077.5.6
Schlagworte:
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/https://doi.org/10.1180/minmag.2013.077.5.6
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Verfasserangaben:Florian Freundt, Sami NAjem, Werner Aeschbach, Margot Isenbeck-Schröter, Bernd Kober, Michael Kraml, Rene Grobe, Axel Wenke

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520 |a The assessment of geothermal potential for deep - geothermal energy production currently relies on expensive - 3D reflexion seismic methods to identify adequate fault zones - and geometry of the geothermal aquifer. However, this - analysis does not allow the estimation of hydraulic - permeability of active faults nor provides a characterisation of - the chemical properties of the deep aquifer fluid. Both factors - play an important role in optimising siting of fault related - geothermal wells and operation of geothermal power plants. - The TRACE project aims to combine methods from - hydrogeochemistry and isotope hydrology in the analysis of - shallow groundwater to develop a low cost method for deep - geothermal energy exploration. The main goal is to constrain - the interest area with further methods supporting geophysical - exploration methods. The approach introduced in this - contribution includes the measurement and evaluation of a - wide range of natural isotopic and geochemical. To assess the - fault permeability, the groundwater 3He/4He ratio will be - analysed for mantle signatures pointing to deep water - circulation and upward flux [1]. The hydrogeochemical - analysis and transport modeling will be used to characterise - the origin and flow path of the thermal water [2] and to assess - its suitability for industrial scale energy production. - The Upper Rhine Graben was chosen as the project’s - study region, focusing on three different local areas with - preexisting well and 2D/3D seismic data to allow for - comparison and validation of the study results. Preliminary - results from the first sampling campaign show promising data, - indicating an area of increased interest where elevated helium - ratios coincide with characteristic geochemical data, fault - location and a previously known saltwater anomaly. 
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