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Geothermal Resource Mapping of Northern Switzerland

Geothermal Resource Mapping of Northern Switzerland. Thomas Kohl, Nathalie Andenmatten-Bertoud, S. Signorelli, L. Rybach Geowatt AG, Zurich, Switzerland. Project goal: Interpretation of Swiss Resource potential in main populated area 3 D geological modeling Numerical analysis

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Geothermal Resource Mapping of Northern Switzerland

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  1. Geothermal Resource Mapping of Northern Switzerland Thomas Kohl, Nathalie Andenmatten-Bertoud, S. Signorelli, L. RybachGeowatt AG, Zurich, Switzerland New and Classical Uses of Heat Flow Studies, Aachen

  2. Project goal: Interpretation of Swiss Resource potential in main populated area 3D geological modeling Numerical analysis GIS interpretation Conventional resource mapping: Total Energy = f(T,V) Utilizable Energy = total Energy x recovery factor Here: 3D subsurface structures Evaluation of transmissivity Assumption of utilization scenario Utilization energy = f(Tr, T, ….) Combination with GIS tools Background New and Classical Uses of Heat Flow Studies, Aachen

  3. Northern Switzerland Well investigated for research of nuclear waste deposit Borehole, seismic profiles, geophysical & geological interpretation 3D determination of subsurface structures New and Classical Uses of Heat Flow Studies, Aachen

  4. Geological 3D mapping • Geological surface interpolation with GOCAD software from data basis • Example top Malm & Muschelkalk layers with borehole marker New and Classical Uses of Heat Flow Studies, Aachen

  5. Benken Böttstein Weiach Leuggern Development of local numerical model • Triangulation of surfaces • Tetrahedrization of geological model • Construction of Finite Element Mesh New and Classical Uses of Heat Flow Studies, Aachen

  6. Numerical patch test New and Classical Uses of Heat Flow Studies, Aachen

  7. Petrophysical Data Measured and averaged parameters from Weiach New and Classical Uses of Heat Flow Studies, Aachen

  8. Local temperature calculation • Calculation of thermal and hydraulic field:Example Weiach New and Classical Uses of Heat Flow Studies, Aachen

  9. Weiach Benken Temperature Data New and Classical Uses of Heat Flow Studies, Aachen

  10. Thermal evaluation: heat flow variation: background vs. local value Peclet Analysis from regional borehole distribution:relating heat flow variation to vD With assumption on head gradient =>Transmissivity estimation Transmissivity evaluation • Evaluation from existing data T j2 z j1 New and Classical Uses of Heat Flow Studies, Aachen

  11. Doublet System: Calculation over time span Dt Transient Gringarten (1978) solution: Necessary surface area Sustainable flow rate Reservoir geometry => Utilizable heat energy = f(t, Tr, T, V, …) in individual reservoir zone Transmissivity Distance Dx Utilization Scenario New and Classical Uses of Heat Flow Studies, Aachen

  12. Northern Switzerland: Resource of altered crystalline basement for 30 yr production Surface area <1km2 Example: Resource Potential Similar evaluation for sedimentary aquifers New and Classical Uses of Heat Flow Studies, Aachen

  13. Boettstein - Leuggern From Local to Regional Models Weiach Local Model Benken Local Model 110mW/m2. Weiach 90mW/m2. Boettstein Local Model 100 – 110mW/m2. Eglisau Zurzach Benken Kaisten Local Model 110mW/m2. Kaisten Lindau Local Model 80mW/m2. Kloten Ruchfelden Riniken Local Model 110mW/m2. Nordschweiz Regional Model Riniken Basserdorf Beznau Birmenstorf New and Classical Uses of Heat Flow Studies, Aachen

  14. Legend: Permocarbon Trog Rand Temperatur: Prel. Temperature Distribution in 2000m b.s.l N New and Classical Uses of Heat Flow Studies, Aachen

  15. Conclusion • Evaluation of 3D geology and regional temperature field • Individual assessment of recovery factor and production time • Cost analysis possible (borehole depth, geological structures, …) • Future combination with GIS tools New and Classical Uses of Heat Flow Studies, Aachen

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