8.11.2007 ENGINE Leiden Combining Areal Underground and Infrastructure Data to Minimize Exploration and Economic Risks Thomas Kohl, GEOWATT AG Clément Baujard, GEOWATT AG Example of West Switzerland Geothermal Productivity Economic Analysis Societal Needs gine: ENhanced Geothermal Innovative Network for Europe
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8.11.2007ENGINE Leiden Combining Areal Underground and Infrastructure Data to Minimize Exploration and Economic Risks Thomas Kohl, GEOWATT AG Clément Baujard,
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8.11.2007 ENGINE Leiden
Combining Areal Underground and Infrastructure Data to Minimize Exploration and Economic Risks
Thomas Kohl, GEOWATT AG
Clément Baujard, GEOWATT AG
Example of West SwitzerlandGeothermal ProductivityEconomic AnalysisSocietal Needs
Engine: ENhanced Geothermal Innovative Network for Europe
8.11.2007 ENGINE Leiden
Investigation of National Swiss Geothermal Ressources
8.11.2007 ENGINE Leiden
Geothermal Potential
Heat in Place
cP specific heat capacity of rock [J m‑3 K‑1],
V Volume of resource [m3],
Tprod Temperature of produced fluid [°C]
Treinj Temperature of re-injected fluid [°C].
Transient Production
(cP)f specific heat capacity of fluids [J m‑3 K‑1]
Q produced flow rate [m3 s‑1].
)( reinjprodPHIP TTVcE
t
reinjprodfP
t
thut
dtTTQc
dtpE
)()(
8.11.2007 ENGINE Leiden
Utilization Scenario
Doublet System:Negligible temperature drawdown
over t=30 yrAnalytic solution (Gringarten, 1978):
Necessary surface area Sustainable flow rate Reservoir geometry
Utilizable heat energy
= f(Tr, T, V, …)
in individual reservoir zone
Dynamic approach:
reservoir depletion
Distance x
Transmissivity
21 /3ln
4
wi
bi rztcQ
PTrQ
8.11.2007 ENGINE Leiden
Resource Analysis: Workflow
Data research Geological data Well data Geophysical data (seismic profiles…) Hydrogeological data (pumping tests, chemical…)
3D Geological model
3D Temperature model Thermal properties from well data Calibration of temperature on well data
Extraction of temperature on aquifers
Computation and mapping of geothermal potential for identified aquifer
Identification of zones of great potential, cross-checking with surface data