Acquiring hybrid High-resolution Streamer/OBN seismic for CCS in the complex environment of the Liverpool Bay.

Between March and June 2022, in a very complex operational context, Eni UK Limited acquired, in Liverpool Bay, a valuable HR streamer/OBN dataset together with a bathy-morphological survey for CCS purposes. The combination of shallow waters (30-2m), the extreme tidal excursion (8-9m) and the shallow geophysical targets (-1000m up to sea bottom) together with the presence of numerous O&G infrastructures, wind farms, and naval traffic have made such offshore acquisition campaign one of the most complex and challenging conducted by Eni in recent years.

Thanks to the outstanding performances achieved by the service contractors involved and the excellent planning in the precursory phases of the project, amazing results have been achieved in accordance with accepted industry standards. All routine and reasonable precautions were taken to protect the environment, property, and persons from damage or injury.

Compared to the vintage seismic, the new dataset presents a marked improvement in terms of resolution and frequency content. Nevertheless, the operational limitations related to the bathymetry and the towed seismic equipment did not allow to image the seabed over the entire survey area, but this lack of information was easily recovered from the SBP data and the OBN survey conducted east of the Lennox-platform.