3D Seismic Exploration of a Carbonate Geothermal Reservoir in Southern Germany

Abstract

The target of seismic exploration for geothermal energy within the Southern German Molasse Basin is the Upper Jurassic (Malm) carbonate platform. Several factors govern its hydraulic transmissivity. The formation of the platform led to different carbonate facies, i.e. reefs and small sedimentary troughs. Further on, fault systems play an important role since the formation of the basin was accompanied by complex faulting. Additionally, local carstification has taken place. A reservoir model of the aquifer has to take into account all of this geological heterogeneity. The seismic interpretation on the other hand has to provide the necessary geological information. Based on a 3D seismic survey a structural model was built, the facies distribution was analysed and carst structures were mapped. For these different tasks mathematical transforms have been evaluated.