GFZ is the national German Research Centre for Geosciences. GFZ combines all solid earth science fields including geodesy, geology, geophysics, mineralogy and geochemistry, in a multidisciplinary research centre. The SURE project is coordinated by the GFZ. In the framework of the project, rock physical properties at reservoir conditions will be investigated at GFZ. Furthermore, numerical methods will be developed to predict the long term performance of stimulated geothermal reservoirs.