Optimising Seismic Data Quality Across Multiple CO2 Storage Sites in the Greater Endurance Area, UK

The Greater Endurance area contains six prospective CO2 storage sites. Initial development of the Endurance structure will store 100 MtCO2 over 25 years within Triassic Bunter saline sandstone reservoir.

During 2022, a 3D High Resolution (3DHR) seismic survey was acquired over an area of across the area, designed to deliver higher near-offset fold to improve resolution within the reservoir and overburden section, improve shallow imaging and to fill 3D seismic coverage holes.

The data were processed through a Pre-Stack Depth Migration (PSDM) flow and successfully led to improved characterisation of the reservoir, overburden, faulting and depth structure at each of the stores within the data area.

During processing of the 3DHR survey, consistent pre-processing and approach to velocity model building were across the full area. Complexities were identified related to changes in subsurface stratigraphy that led to variations of seismic data quality across the prospective stores that could not be addressed within the project scope.

Recognising that a regional processing approach could not deliver the quality of seismic data required across all prospective stores within Greater Endurance, additional processing of targeted areas of the 3DHR data has been carried out adapted to the specific subsurface challenges of each.