ENGINE Launching Conference, Orleans, 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.

ENGINE Launching Conference, Orleans, February 2006

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

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

ENGINE Launching Conference, Orleans, February 2006 Zemaiciu Naumiestis Hot Granites 50 km Heat Flow and Granite Thickness

ENGINE Launching Conference, Orleans, February 2006 Geochemical Complexity

ENGINE Launching Conference, Orleans, February 2006 Radiogenic Heat Production

ENGINE Launching Conference, Orleans, February 2006 Alteration Effects in the Erzgebirge

ENGINE Launching Conference, Orleans, February 2006 Unaltered Erzgebirge Samples HHP

ENGINE Launching Conference, Orleans, February 2006 General Trends

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

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

ENGINE Launching Conference, Orleans, 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?

ENGINE Launching Conference, Orleans, 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

ENGINE Launching Conference, Orleans, 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