Development of an optimized, combined and high-resolution imaging method for the site investigation of radioactive repositories (DOSIS)

3D seismic measurements are a tool for high-resolution structural exploration of the subsurface using artificially generated seismic waves. Depending on the acquisition geometry and the seismic source, structures can be examined at depths ranging from a few meters to more than 10 km. The accuracy of the geological layer boundaries in the depth image resulting from the field data depends heavily on the quality and the details of the physical earth model and the imaging algorithms used.

The "DOSIS" project was initiated in order to design an optimized, combined and high-resolution method to facilitate finding answers for important geophysical and geological questions in the exploration of repository sites in Germany in the future. In the framework of the "DOSIS" project, the simulation of elastic waves using finite differences and the associated full-waveform inversion as well as the Fresnel-volume migration are further developed, so that seismic anisotropy and inelastic attenuation can be taken into account for a detailed characterization of the subsurface. These methods are tested and validated using both, synthetic data and real data in the form of a massive high-quality 3D seismic data set acquired in 2020 in the area of the "Asse" salt structure in Lower Saxony and provided by BGE.