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. The northern Upper Rhine Graben is due to its tectonic setting and thepositive geothermal anomaly a key region for geothermal heat and powerproduction in Europe. In this area the Upper Eocene to Lower OligocenePechelbronn Group reaches depths of up to 2800 m with temperatures oflocally more than 130  ∘ C. In order to assess the hydrothermalpotential of the Pechelbronn Group a large dataset is compiled and evaluated.Petrophysical parameters are measured on core samples of eight boreholes(courtesy of Exxon Mobil). Additionally, 15 gamma-ray logs, 99 lithology logsas well as more than 2500 porosity and permeability measurements on cores ofsome of these boreholes are available. The Lower Pechelbronn Beds are composed of fluvial to lacustrine sediments,the Middle Pechelbronn Beds were deposited in a brackish to marineenvironment and the Upper Pechelbronn Beds consist of fluvial/alluvial tomarine deposits. In between the western and eastern masterfaults of theUpper Rhine Graben several fault blocks exist, with fault orientation beingsub-parallel to the graben shoulders. During the syntectonic deposition ofthe Pechelbronn Group these fault blocks acted as isolated depocenters,resulting in considerable thickness and depositional facies variations onthe regional and local scale (few tens to several hundreds of meters). Laboratory measurements of sonic wave velocity, density, porosity,permeability, thermal conductivity and diffusivity are conducted on the coresamples that are classified into lithofacies groups. Statistically evaluatedpetrophysical parameters are assigned to each group. The gamma-ray logsserve to verify the lithological classification and can further be used forcorrelation analysis or joint inversion with the petrophysical data. Well data, seismic sections, isolines and geological profiles are used toconstruct a geological 3-D model. It is planned to use the petrophysical,thermal and hydraulic rock properties at a later stage to parametrize themodel unit and to determine, together with the temperature and thickness ofthe model unit, the expected flow rates and reservoir temperatures and thusthe hydrothermal potential.

Preliminary studies for an integrated assessment of the hydrothermal potential of the Pechelbronn Group in the northern Upper Rhine Graben