Températures à 5000 m de profondeur Soultz Project Concept HDR Températures à 5000 m de profondeur <60°C 60-80 80-100 100-120 120-140 140-160 160-180 180-200 200-240 >240°C Fracture Permeability - Petrophysics Identification of hydraulic geothermal transfer zones Caracterization of the reservoir life time J.J. Royer – J. Sausse

A pilote power station of 6MW in order to build a prototype of 25 MW Final Soultz Project GPK4 GPK2 200°C 200°C 70°C 50 l/s 50 l/s 5000 m 100 l/s A pilote power station of 6MW in order to build a prototype of 25 MW

High Surface Heat Flow Anomaly Geothermal Heat Flow of 80 mW/m2 within the graben Anomaly explained by several convective cells from East to West Anomal Surface Heat Flow

(Renard and Courrioux, 1994) Data 93 94 95 96 2000 Vertical Section Geology and seismic sections, Wells, Logings, faults, Micro-seismic cloud (93, 94, 95, 96, 2000, 2003, 2004) Objectives : to predict the permeability To estimate the yield and life time of the geothermal reservoir (Renard and Courrioux, 1994) Top view Microseismicity Utilisee pour la modelisation : 3 outils

GPK1 Interpretating flow logs and logings permeability clear evidences cumulated electric ARI apertures (microns) Q (l/s) 2000 4000 6000 8000 10000 12000 14000 16000 2800 2900 3000 3100 3200 3300 3400 3500 Sausse and Genter, 2005 clear evidences GPK1 subvertical and progressive evolution of the curve thin structures regularly spaced  connected network of fractures (pervasive alteration of the granite matrix) smaller fraction of the flows during injection Flow log discontinuous curve drains or clustered structures  isolated percolation features GPK1 depth (m)

Fracture Opening during Hydrofracturation

Shearing Model

Coupling thermo-hydraulic modeling of fractured porous mediums. GPK1 GPK2 100m N 100m GPK1 GPK2 East View Vertical Section Top View V=cst, Stml inchangees pdt resolution tracer et temp 300m Pressure Field Double permeability Model Thermo-mechanical Model 360 streamlines – 125.000 cells - Soultz Liad © 2005

3D Numerical Modeling of the Reservoir at 5000m Modeling the life time of the geothermal reservoir 3D Numerical Modeling of the Reservoir at 5000m Bottom well temperature Top View Time (in year) Total power at well bottom Animation at Soultz (France): Cool fluid invading the hot deep (5000m) rocks Temperature of injection 70°C Temperature at production vs time 500m Time (in year)

Total power at well bottom Results Characterization of fluids circulation in low permeable fractured medium Poro-elastic medium Interaction fluid rock (weathering, precipitation) Thermo-mechanical effects Exchange sediment basement Bottom well temperature Time (in year) Total power at well bottom Time (in year)