Exploration of the enhanced geothermal system (EGS) potential of crystalline rocks for district heating (Elbe Zone, Saxony, Germany)

This paper addresses aspects of a baseline geothermal exploration of the thermally quiescent Elbe Zone (hosting the cities of Meissen and Dresden) for a potential deployment of geothermal heat in municipal heating systems. Low-permeable to impermeable igneous and metamorphic rocks constitute the maj...

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Veröffentlicht in:International journal of earth sciences : Geologische Rundschau 2018, Vol.107 (1), p.89-101
Hauptverfasser: Förster, Andrea, Förster, Hans-Jürgen, Krentz, Ottomar
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Förster, Hans-Jürgen
Krentz, Ottomar
description This paper addresses aspects of a baseline geothermal exploration of the thermally quiescent Elbe Zone (hosting the cities of Meissen and Dresden) for a potential deployment of geothermal heat in municipal heating systems. Low-permeable to impermeable igneous and metamorphic rocks constitute the major rock types at depth, implying that an enhanced geothermal system needs to be developed by creating artificial flow paths for fluids to enhance the heat extraction from the subsurface. The study includes the development of geological models for two areas on the basis of which temperature models are generated at upper crustal scale. The models are parameterized with laboratory-measured rock thermal properties (thermal conductivity k , radiogenic heat production H ). The uncertainties of modelled temperature caused by observed variations of k and H and inferred mantle heat flow are assessed. The study delineates highest temperatures within the intermediate (monzonite/syenite unit) and mafic rocks (diorite/monzodiorite unit) forming the deeper portions of the Meissen Massif and, specifically for the Dresden area, also within the low-metamorphic rocks (slates/phyllites/quartzites) of the Elbtalschiefergebirge. Boreholes 3–4 km deep need to be drilled to reach the envisioned economically favourable temperatures of 120 °C. The metamorphic and mafic rocks exhibit low concentrations of U and Th, thus being advantageous for a geothermal use. For the monzonite/syenite unit of high heat production (~6 µW m −3 ) in the Meissen Massif, the mobilization of Th and U into the geothermal working fluid is assumed to be minor, although their various radioactive decay products will be omnipresent during geothermal use.
doi_str_mv 10.1007/s00531-016-1429-6
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Low-permeable to impermeable igneous and metamorphic rocks constitute the major rock types at depth, implying that an enhanced geothermal system needs to be developed by creating artificial flow paths for fluids to enhance the heat extraction from the subsurface. The study includes the development of geological models for two areas on the basis of which temperature models are generated at upper crustal scale. The models are parameterized with laboratory-measured rock thermal properties (thermal conductivity k , radiogenic heat production H ). The uncertainties of modelled temperature caused by observed variations of k and H and inferred mantle heat flow are assessed. The study delineates highest temperatures within the intermediate (monzonite/syenite unit) and mafic rocks (diorite/monzodiorite unit) forming the deeper portions of the Meissen Massif and, specifically for the Dresden area, also within the low-metamorphic rocks (slates/phyllites/quartzites) of the Elbtalschiefergebirge. 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Low-permeable to impermeable igneous and metamorphic rocks constitute the major rock types at depth, implying that an enhanced geothermal system needs to be developed by creating artificial flow paths for fluids to enhance the heat extraction from the subsurface. The study includes the development of geological models for two areas on the basis of which temperature models are generated at upper crustal scale. The models are parameterized with laboratory-measured rock thermal properties (thermal conductivity k , radiogenic heat production H ). The uncertainties of modelled temperature caused by observed variations of k and H and inferred mantle heat flow are assessed. The study delineates highest temperatures within the intermediate (monzonite/syenite unit) and mafic rocks (diorite/monzodiorite unit) forming the deeper portions of the Meissen Massif and, specifically for the Dresden area, also within the low-metamorphic rocks (slates/phyllites/quartzites) of the Elbtalschiefergebirge. Boreholes 3–4 km deep need to be drilled to reach the envisioned economically favourable temperatures of 120 °C. The metamorphic and mafic rocks exhibit low concentrations of U and Th, thus being advantageous for a geothermal use. For the monzonite/syenite unit of high heat production (~6 µW m −3 ) in the Meissen Massif, the mobilization of Th and U into the geothermal working fluid is assumed to be minor, although their various radioactive decay products will be omnipresent during geothermal use.</description><subject>Boreholes</subject><subject>Computational fluid dynamics</subject><subject>Crystalline rocks</subject><subject>Decay</subject><subject>Deployment</subject><subject>Diorite</subject><subject>District heating</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Enhanced geothermal systems</subject><subject>Exploration</subject><subject>Flow paths</subject><subject>Fluid flow</subject><subject>Fluids</subject><subject>Geochemistry</subject><subject>Geology</subject><subject>Geophysics/Geodesy</subject><subject>Geothermal exploration</subject><subject>Geothermal resources</subject><subject>Heat</subject><subject>Heat flow</subject><subject>Heat transmission</subject><subject>Heat treatment</subject><subject>Heating</subject><subject>Heating systems</subject><subject>Isotopes</subject><subject>Low concentrations</subject><subject>Metamorphic rocks</subject><subject>Mineral Resources</subject><subject>Original Paper</subject><subject>Quartzite</subject><subject>Radioactive decay</subject><subject>Rock</subject><subject>Sedimentology</subject><subject>Slates</subject><subject>Structural Geology</subject><subject>Syenite</subject><subject>Temperature</subject><subject>Thermal conductivity</subject><subject>Thermal properties</subject><subject>Thermodynamic properties</subject><subject>Thorium</subject><subject>Uranium</subject><subject>Working fluids</subject><issn>1437-3254</issn><issn>1437-3262</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp1kEFLwzAYhoMoOKc_wFvAi4NVkyZN16OMOYWBh-nFS0iTdOvskppksN794aZUxIunJF_e5_3gAeAaozuMUH7vEcoIThBmCaZpkbATMMKU5AlJWXr6e8_oObjwfodQP8Aj8LU4to11ItTWQFvBsNVQm60wUiu40Ta-3V400Hc-6D28XSzXE9jaoE2o4zgS0sUv0TS10dBZ-eFhZR1UtQ-ulgFudew2m0g2pYbv1ugpXIujNd0ULvtu000uwVklGq-vfs4xeHtcvM6fktXL8nn-sEoEIUVIClKlVFKmMJEzTHJFlSiVTmdpITRlrMxzoRCVGBWKEcUqJrOsysosT0tSVpSMwc3Q2zr7edA-8J09OBNXclzMsmiQIBRTeEhJZ713uuKtq_fCdRwj3svmg2weZfNeNmeRSQfGx6zZaPen-V_oGwW1gqs</recordid><startdate>2018</startdate><enddate>2018</enddate><creator>Förster, Andrea</creator><creator>Förster, Hans-Jürgen</creator><creator>Krentz, Ottomar</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TG</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>L.G</scope><scope>M2P</scope><scope>PATMY</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PYCSY</scope><scope>Q9U</scope></search><sort><creationdate>2018</creationdate><title>Exploration of the enhanced geothermal system (EGS) potential of crystalline rocks for district heating (Elbe Zone, Saxony, Germany)</title><author>Förster, Andrea ; 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Low-permeable to impermeable igneous and metamorphic rocks constitute the major rock types at depth, implying that an enhanced geothermal system needs to be developed by creating artificial flow paths for fluids to enhance the heat extraction from the subsurface. The study includes the development of geological models for two areas on the basis of which temperature models are generated at upper crustal scale. The models are parameterized with laboratory-measured rock thermal properties (thermal conductivity k , radiogenic heat production H ). The uncertainties of modelled temperature caused by observed variations of k and H and inferred mantle heat flow are assessed. The study delineates highest temperatures within the intermediate (monzonite/syenite unit) and mafic rocks (diorite/monzodiorite unit) forming the deeper portions of the Meissen Massif and, specifically for the Dresden area, also within the low-metamorphic rocks (slates/phyllites/quartzites) of the Elbtalschiefergebirge. Boreholes 3–4 km deep need to be drilled to reach the envisioned economically favourable temperatures of 120 °C. The metamorphic and mafic rocks exhibit low concentrations of U and Th, thus being advantageous for a geothermal use. For the monzonite/syenite unit of high heat production (~6 µW m −3 ) in the Meissen Massif, the mobilization of Th and U into the geothermal working fluid is assumed to be minor, although their various radioactive decay products will be omnipresent during geothermal use.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s00531-016-1429-6</doi><tpages>13</tpages></addata></record>
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subjects Boreholes
Computational fluid dynamics
Crystalline rocks
Decay
Deployment
Diorite
District heating
Earth and Environmental Science
Earth Sciences
Enhanced geothermal systems
Exploration
Flow paths
Fluid flow
Fluids
Geochemistry
Geology
Geophysics/Geodesy
Geothermal exploration
Geothermal resources
Heat
Heat flow
Heat transmission
Heat treatment
Heating
Heating systems
Isotopes
Low concentrations
Metamorphic rocks
Mineral Resources
Original Paper
Quartzite
Radioactive decay
Rock
Sedimentology
Slates
Structural Geology
Syenite
Temperature
Thermal conductivity
Thermal properties
Thermodynamic properties
Thorium
Uranium
Working fluids
title Exploration of the enhanced geothermal system (EGS) potential of crystalline rocks for district heating (Elbe Zone, Saxony, Germany)
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