Seismic imaging of shallow marine sediments offshore Denmark using ultra-high resolution multi-channel seismic data

The in-depth knowledge of the shallow marine sedimentary record is essential to access the potential of offshore areas for windfarm installations and to assess associated risks effectively. GEUS is currently conducting a geological screening of the entire offshore area in Denmark for the Danish Energy Agency as a part of the project “Screening and Environmental mapping of offshore Wind potential in Denmark”, with an aim to gain a comprehensive overview of the combined offshore wind potential. As part of the screening, GEUS has acquired 6405 km multi-channel (48-96 channels) ultra-high resolution seismic data in 2022-23 for mapping of the shallow (<100-150 m below the seafloor) sedimentary units. The dataset was acquired using a sparker source with dominant signal in the 100-1200 Hz frequency range. Here, we present the processing workflow, challenges, and preliminary results from the processed dataset. We also highlight additional geological insights deduced from the interpretation of the ultra-high resolution seismic data. The project has a wider significance as it greatly enhances our geological understanding of shallow marine sediments in Denmark's offshore regions.