Engine ENhanced Geothermal Innovative Network for Europe Combining

  • Slides: 14
Download presentation
Engine: ENhanced Geothermal Innovative Network for Europe Combining Areal Underground and Infrastructure Data to

Engine: ENhanced Geothermal Innovative Network for Europe Combining Areal Underground and Infrastructure Data to Minimize Exploration and Economic Risks Thomas Kohl, GEOWATT AG Clément Baujard, GEOWATT AG Example of West Switzerland ØGeothermal Productivity ØEconomic Analysis ØSocietal Needs 8. 11. 2007 ENGINE Leiden

Investigation of National Swiss Geothermal Ressources 8. 11. 2007 ENGINE Leiden

Investigation of National Swiss Geothermal Ressources 8. 11. 2007 ENGINE Leiden

Geothermal Potential Heat in Place Transient Production rc. P specific heat capacity of rock

Geothermal Potential Heat in Place Transient Production rc. P specific heat capacity of rock [J m‑ 3 K‑ 1], (rc. P)f specific heat capacity of fluids [J m‑ 3 K‑ 1] Q produced flow rate [m 3 s‑ 1]. V Volume of resource [m 3], Tprod Temperature of produced fluid [°C] Treinj Temperature of re-injected fluid [°C]. 8. 11. 2007 ENGINE Leiden

Utilization Scenario Doublet System: Negligible temperature drawdown over Dt=30 yr Analytic solution (Gringarten, 1978):

Utilization Scenario Doublet System: Negligible temperature drawdown over Dt=30 yr Analytic solution (Gringarten, 1978): Ø Necessary surface area Ø Sustainable flow rate Ø Reservoir geometry Transmissivity Þ Utilizable heat energy = f(Tr, T, V, …) in individual reservoir zone Distance Dx 8. 11. 2007 Þ Dynamic approach: ENGINE Leiden reservoir depletion

Resource Analysis: Workflow Data research Ø Ø Geological data Well data Geophysical data (seismic

Resource Analysis: Workflow Data research Ø Ø Geological data Well data Geophysical data (seismic profiles…) Hydrogeological data (pumping tests, chemical…) 3 D Geological model 3 D Temperature model Ø Thermal properties from well data Ø 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 8. 11. 2007 ENGINE Leiden

3 D Temperature field in domains Ø Conversion of the geological model into FE

3 D Temperature field in domains Ø Conversion of the geological model into FE Ø Attribution of petrophysical data to units Ø Simulation of the temperature using FRACTure Ø Parameters: • • 8. 11. 2007 ENGINE Leiden Surface temperature, geologic model, Thermal conductivity, Basal heat flow distribution

Developing Thermal Calibration Model 8. 11. 2007 ENGINE Leiden

Developing Thermal Calibration Model 8. 11. 2007 ENGINE Leiden

Thermal Calibration Model Temperature along Top 500 m Crystalline 8. 11. 2007 ENGINE Leiden

Thermal Calibration Model Temperature along Top 500 m Crystalline 8. 11. 2007 ENGINE Leiden

Hydrogeological Parameters Crystalline Basement Ø Top 500 m Depth dependency Bimodal Distribution 8. 11.

Hydrogeological Parameters Crystalline Basement Ø Top 500 m Depth dependency Bimodal Distribution 8. 11. 2007 ENGINE Leiden

Identifying aquifers Aquifer Hydraulic conductivity Thickness Upper Marine Molasse 2. 10 -7 ms-1 50

Identifying aquifers Aquifer Hydraulic conductivity Thickness Upper Marine Molasse 2. 10 -7 ms-1 50 -700 m Upper Muschelkalk 1. 10 -7 ms-1 <70 m> Altered Crystalline 1. 10 -8 ms-1 8. 11. 2007 to 1. 10 -4 ms-1 <500 m> to 1 10 -6 ms-1 ENGINE Leiden

Potential Geothermal Energy West Switzerland (Upper Muschelkalk) Key Parameters: Ø Geometry of the aquifer

Potential Geothermal Energy West Switzerland (Upper Muschelkalk) Key Parameters: Ø Geometry of the aquifer Ø Temperature at depth Ø Hydraulic conductivity 8. 11. 2007 ENGINE Leiden

Economic modeling Concepts Parameters: Ø Heat production or electricity production • Option 1: Pure

Economic modeling Concepts Parameters: Ø Heat production or electricity production • Option 1: Pure Heat Production • Option 2: Pure Electricity Production • Option 3: Coupled Electricity & Heat Production Ø Depth of the borehole Ø Drilling costs • Fixed at 1500€/m or 2200€/m • Increasing with depth Ø Conversion efficiency: • Increasing with depth Ø Operational efforts: • pump energy needs Ø Market selling prices and buying prices of heat and electricity Ø Annuity of loans Ø… 8. 11. 2007 ENGINE Leiden

Economic modeling Results Typical results of a parameter study (not definitive) Electricity costs CHF/k.

Economic modeling Results Typical results of a parameter study (not definitive) Electricity costs CHF/k. Wh 8. 11. 2007 ENGINE Leiden

Conclusion Resource analyses are a powerful tool to quantify and map the geothermal potential

Conclusion Resource analyses are a powerful tool to quantify and map the geothermal potential of a region Ø It allows to identify the most interesting regions Ø The geothermal potential can be easily integrated in GIS • Planning tool for local authorities Ø The risk can be expressed in a probable cost model Ø The energy demand could be covered from geothermal, • However: under realistic premises only to a small amount Don't overestimate the geothermal potential! 8. 11. 2007 ENGINE Leiden