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3D-Modellierung der tiefengeothermischen Potenziale von Hessen – Eingangsdaten und Potenzialausweisung

[3D modelling of the deep geothermal potential of the Federal State of Hesse (Germany) – input data and identifi cation of potential.]

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Im Rahmen des Forschungsprojektes,,3D-Modellierung der Geothermischen Tiefenpotenziale von Hessen" wird für ganz Hessen das tiefengeothermische Potenzial quantifiziert und qualitativ beurteilt. Die Quantifizierung der im Untergrund gespeicherten Wärme und die qualitative Beurteilung des Potenzials basieren auf einem geologisch-geothermischen 3D-Modell (vgl. Arndt et al. 2011) und erfolgt für verschiedene tiefengeothermische Nutzungssysteme. Im Sinne eines Multikriterienansatzes werden die für die Tiefengeothermie als relevant eingestuften thermophysikalischen, hydraulischen und tektonischen Parameter entsprechend einer nutzungsartabhängigen Wichtung zur qualitativen Potenzialausweisung berücksichtigt. Als Grundlage dazu dienen für jeden Parameter definierte Grenzwerte. Diese legen fest, ob für den vorliegenden Wertebereich ein sehr hohes, hohes, mittleres, geringes oder sehr geringes Potenzial vorliegt. Aus dem attributierten geologischen 3D-Modell können auf infrage kommende Zielhorizonte und Standorte alle relevanten Parameter abgefragt und zur Berechnung des lokalen geothermischen Potenzials herangezogen werden. Abschließend können in einem weiteren Schritt die lokalen Ergebnisse für jede potenziell geeignete Formation und Nutzungsart in die Fläche interpoliert und in Karten oder Schnitten dargestellt werden.

Abstract

Within the scope of the research project "3D-modelling of the deep geothermal potentials of Hesse" the deep geothermal potential of the Federal State of Hesse was quantified and assessed in a qualitative analysis. The quantification of the heat stored under ground and the qualitative analysis was done for different geothermal systems. These are hydrothermal and petrothermal systems, as well as fault zones and deep borehole heat exchangers.

For the assessment of the deep geothermal potential, knowledge of the geological structure and the geothermal properties of the potential reservoir rocks are indispensable. Therefore, a 3D model of the deep geothermal potential of the Federal State of Hesse (Germany) has been developed (cf. Arndt et al. 2011). Systematic measurements of thermophysical and hydraulic rock properties such as thermal conductivity, heat capacity and permeability of relevant geologic formations have been combined with in-situ temperature measurements, hydrothermal upwelling zones, characteristics of geological faults and were added to the 3D geological structural model. Using a multiple criteria approach, the various rock and reservoir properties were assessed incorporating their relevance for the different geothermal systems to allow the qualitative analysis. Therefore, threshold values for each parameter were defined specifying whether the potential is very high, high, medium, low or very low. This method was tested for the one-dimensional case (virtual drilling) and the two-dimensional case (geological-geothermical cross-sections) before being applied to the 3D model.

The resulting geothermal model, which incorporates the quantification and the qualitative analysis, is an important tool, which can be used at an early stage of the planning phase for the design of geothermal power plants. Furthermore, it allows quantification of the deep geothermal potential and is intended to be an instrument for public information.
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Keywords: DEUTSCHLAND; GEOLOGISCHES 3D-MODELL; GEOTHERMIE; GEOTHERMISCHES POTENZIAL; GOCAD; HESSEN; HYDRAULISCHE KENNWERTE; OBERRHEINGRABEN; THERMOPHYSIKALISCHE GESTEINSEIGENSCHAFTEN

Language: German

Document Type: Research Article

Publication date: 01 December 2011

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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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