geothermal resource atlas of the swiss...
TRANSCRIPT
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640000 650000 660000 670000 680000 690000 700000240000
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280000 Fault
Fault
Altered Crystalline
Altered Crystalline
Altered Crystalline below Permo-Carbon trough
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Temp. [°C]: 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210
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Temp [°C]4003753503253002752502252001751501251007550250
Weiach
Benken
Lindau
RinikenLeuggern
ANALYSIS OF EXISTING TEMPERATURE DATA
PROCEDURE
Our methodology integrated existing geological, hydrogeological and petrophysical data in a 3D numerical evaluation. Areas of significant convective flow can be located. In combination with surface utilisation data zones, suited for geothermal doublet systems (power production) and even preferential sites for borehole heat exchanger systems (heat production), can then be identified. This approach allows us to better define the financial risk of geothermal utilization systems on reducing the hazard in exploration of reservoirs.
GOAL
The increased interest in geothermal energy leads to a desire for more sophisticated analyses of available geothermal resources for heat and power production.
AREA OF INVESTIGATION AND AVAILABLE DATA
SUMMARY
The project contains different successful developments:
• Qualitative model assessment by merging geological and geophysical data inter-pretation into a 3D geological model.
• Quantitative evaluation by discretization and parameterization on a regional scale
500 – >1000 m
3D NUMERICAL TEMPERATURE SIMULATION
• Conversion of the geological model into finite elements
• Attribution of petrophysical data to geological units
• Simulation of the temperature using the software FRACTure
EVALUATION OF GEOTHERMAL RESOURCE ON A REGIONAL SCALE: Preliminary geothermal potential for Top Crystalline
3 – 5 km
Power Production Heat Production
3D GEOLOGICAL MODEL
Construction of 3D geological model on the basis of numerous data sets such as seismic profiles, geological interpreta-tions and borehole data using the soft-ware GOCAD
Discretization in a 3D representation model with tetrahedral meshes
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Weiach
Benken
Lindau
RinikenLeuggern
Finite Element Model Petrophysical Data
Temperature Simulation
• Calibration and uncertainty analysis • Definition of regional geothermal resources• Identification of areas of high geothermal interest by combination with
surface GIS data
The geothermal resource atlas indicates a possible annually extractable energy of 10 PJ per km3
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Seon
Benken
Beznau
Kloten
Weiach
Furttal
Kaisten
Riniken
Boswil 1
Lindau 1
LeuggernEglisau 2
Siblingen
Densbueren
Zurzach Z3
BoettsteinRuchfelden
Bassersdorf
Kuesnacht 1
Schafisheim
Birmenstorf
Fehraltorf 1
Aqui 1 (Zurich)
Schinznach Dorf
Lottstetten (Nack)
Hausen-Habsburg HH1
Zurich Tiefenbrunnen
LakesBlack Forest, VosgesMolasse BasinTabular JuraFolded Jura
$ Geological boreholes$ Temperature borehole
Area of Investigation
Seismic profil-lignes
10 km
Interpretation of geological data Discretization with tetrahedral meshes
1. Quantification of hydrogeological condi-tions based on analysis of available measurements to identify zones of convective flow
2. Simulation of the temperature field 3. Identification of areas suitable for geo-thermal use based on surface GIS data:
• <500 m from water (Cooling)
• <200 m from buildings (Heat supply)
4. Identification of areas of high geother-mal interest by combination of hydro-geological conditions and temperature field with surface data
+ + =
Topography
Altered Crystalline
CrystallineP
ermo-C
arbon
trough
Hydrogeological condition Temperature distribution Surface utilization Geothermal power and surface utilization
Geothermal Resource Atlas of the Swiss PlateauT. Kohl & S. Signorelli
GEOWATT, Dohlenweg 28, CH-8050 Zürich, Switzerland Email: [email protected]