Page 13 - Geothermal Energy Systems Exploration, Development, and Utilization

Contents XI

5.3.2 Fluid Properties 254
5.3.2.1 Density and Viscosity 254
5.3.2.2 Heat Capacity and Thermal Conductivity 255
5.3.3 Supercritical Fluids 257
5.3.4 Uncertainty Assessment 258
5.4 Site Studies 260
5.5 Groß Sch¨ onebeck 260
5.5.1 Introduction 260
5.5.2 Model Description 261
5.5.2.1 Geology 261
5.5.2.2 Structure 262
5.5.2.3 Thermal Conditions 263
5.5.2.4 Hydraulic Conditions 263
5.5.3 Modeling Approach 264
5.5.4 Results 265
5.5.5 Conclusions 268
5.6 Bad Urach 268
5.6.1 The Influence of Parameter Uncertainty on Reservoir Evolution 268
5.6.1.1 Conceptual Model 268
5.6.1.2 Simulation Results 270
5.6.1.3 Stimulated Reservoir Model 270
5.6.1.4 Monte Carlo Analysis 271
5.6.1.5 Conclusions 275
5.6.2 The Influence of Coupled Processes on Differential Reservoir
Cooling 275
5.6.2.1 Conceptual Model 275
5.6.2.2 Development of Preferential Flow Paths due to Positive Feedback
Loops in Coupled Processes and Potential Reservoir Damage 276
5.6.3 The Importance of Thermal Stress in the Rock Mass 278
5.7 Rosemanowes (United Kingdom) 279
5.8 Soultz-sous-Forets (France) 280
5.9 KTB (Germany) 284
5.9.1 Introduction 284
5.9.2 Geomechanical Facies and Modeling the HM Behavior of the KTB
Pump Test 285
5.10 Stralsund (Germany) 287
5.10.1 Site Description 290
5.10.2 Model Setup 290
5.10.3 Long-Term Development of Reservoir Properties 291
References 293

6 Energetic Use of EGS Reservoirs 303
Ali Saadat, Stephanie Frick, Stefan Kranz, and Simona Regenspurg
6.1 Utilization Options 303
6.1.1 Energetic Considerations 303