Planning and approval of deep geothermal wells require detailed preliminary knowledge of the geological subsurface and its geophysical and petrophysical parameters. Afterwards, geothermal potentials can be modeled and preliminary profiles for injection and production wells or probe fields and underground reservoirs can be developed before investment decisions are made. The geological subsurface of the state of Baden-Württemberg is characterized by a broad spectrum of large- and small-scale subsurface structures. Nevertheless, the level of exploration is comparatively high due to more than 200 years of state mapping, hydrocarbon exploration, and groundwater development, so that a geological geothermal profile can be predicted for virtually every point in BW. Due to the need to implement future geothermal projects more quickly, geological-geophysical data must be rapidly available in comparable formats and to a wide range of users. For this purpose, the LFZG is developing a GIS system based on the geological map of Baden-Württemberg 1:25,000 and its explanatory notes. The 304 sheets are subdivided with a scalable grid, which uses a database. In addition to the stratigraphic profiles, the geothermal parameters as well as information on the reservoir geology and the stress field are stored in this database. In the future, it will be possible for anyone to create a geological-geothermal preliminary study for any point in Baden-Württemberg via an online interface.