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0

500

-4500

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-3000-2500

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-1000-1000

-1000

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-500

640000 650000 660000 670000 680000 690000 700000240000

250000

260000

270000

280000 Fault

Fault

Altered Crystalline

Altered Crystalline

Altered Crystalline below Permo-Carbon trough

-10000

-5000

0

640000650000

660000670000

680000690000

700000

240000

250000

260000

270000

280000

Temp. [°C]: 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210

-10000

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0

640000650000

660000670000

680000690000

700000

240000

250000

260000

270000

280000

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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640000650000

660000670000

680000690000

700000

240000

250000

260000

270000

280000

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: kohl@geowatt.com