Geosystem

Various geophysical and geological techniques will be employed for the exploration of geothermal reservoirs, characterised by the presence of fault zones. Using hydraulic and transport investigations, fluid flow and heat transport parameters (hydraulic conductivities, specific area, effective porosity, reservoir shape, geomechanic properties) will be quantified. Particular emphasis shall also be placed on the assessment of the chemical composition of the highly saline brines and its effect on the formation of borehole skins. Finally numerical models shall be developed investigating the effect of thermo-hydro-mechanical process coupling as well as for the prediction of the long-term development of the geothermal reservoir.

The following results are expected:

• exploration strategy for fault systems;

• knowledge of reservoir characteristics for the optimum choice of the efficient drilling technology;

• determination and evaluation of relevant parameters by means of hydraulic, tracer and heat tests;

• recommendations concerning reservoir behaviour in long-term simulation for efficient energy production.

Coordinator: Dr. Rüdiger Thomas