1. ENGINE Launching Conference, Orleans, 12-15 February 2006 The geothermal use of high-heat-production granites: the recycling of an old concept Förster, A., Förster, H.-J., Rossi, P., Cocherie, A., Guillou-Frottier, L., Schulman, K., Sliaupa, S.

2. ENGINE Launching Conference, Orleans, 12-15 February 2006

3. HHP-Granite Occurrences in Europe Germany: Erzgebirge Meißen Massif Sax. Granulite Massif Harz Mts.

4. ENGINE Launching Conference, Orleans, 12-15 February 2006 Pure Geothermics (Exploration) Extension/Thickness Heat-Flow Density Radiogenic Heat Production Thermal Conductivity Fluid Regime Fracture/Fault Patterns

5. ENGINE Launching Conference, Orleans, 12-15 February 2006 Zemaiciu Naumiestis Hot Granites 50 km Heat Flow and Granite Thickness

6. ENGINE Launching Conference, Orleans, 12-15 February 2006 Geochemical Complexity

7. ENGINE Launching Conference, Orleans, 12-15 February 2006 Radiogenic Heat Production

8. ENGINE Launching Conference, Orleans, 12-15 February 2006 Alteration Effects in the Erzgebirge

9. ENGINE Launching Conference, Orleans, 12-15 February 2006 Unaltered Erzgebirge Samples HHP

10. ENGINE Launching Conference, Orleans, 12-15 February 2006 General Trends

11. ENGINE Launching Conference, Orleans, 12-15 February 2006 General Trends Low-silica, Th-rich HHP granites form the most predestined resources Susceptibility to Leaching Uranium: 30-90 %Thorium: < 20 % some Erzgebirge granites Meißen Massif Saxonian Granulite Massif Armorican Massif Scottish Caledonides granites in the shields

12. ENGINE Launching Conference, Orleans, 12-15 February 2006 Faults/Fractures Modern Stress Field Fluid-Rock Interaction Data Banking Future Research Exploration Typifying Granites for Geothermal Use

13. ENGINE Launching Conference, Orleans, 12-15 February 2006 HHP granites exhibit a great potential geothermal resource. Is it feasible and economic to develop this potential? Where do we go from the Cornwall HDR experiment?

14. ENGINE Launching Conference, Orleans, 12-15 February 2006 CommercialPotentially commercial Productive hydrothermal Enhanced geothermal Hot dry rock * Hydrofracture, targeted injection, acid leaching, directional drilling, etc. Suitable for reservoir enhancement* High Zero Natural permeability

15. ENGINE Launching Conference, Orleans, 12-15 February 2006 Future R & D Reservoir Engineering European Borehole Test Site ? Geomechanical Analysis and Modeling Numerical Thermo- hydraulic Modeling Different-Scale Experiments Development of a Stimulation Technology