The Permian Rotliegend Group Leman Sandstone Formation has been a prolific gas reservoir in the UK Southern North Sea for more than five decades and now provides an excellent opportunity for CO 2 storage. Geological evaluation of the depleted Victor Field, now designated the Viking South Carbon Store, has demonstrated its suitability for subsurface storage. Integration of seismic interpretation, with well log and core data confirm a laterally extensive, high-quality and well-connected reservoir characterised by a high net to gross and minimal heterogeneity. Structural mapping defines a simple trap composed of a closed fault-bound horst block. A contiguous reservoir with limited aquifer support is confirmed from production data. The primary seal for the Leman Sandstone Formation storage unit is provided by the regionally continuous Zechstein Group evaporites and the overlying Bunter Shale Formation. Secondary containment is provided in the Bunter Sandstone Formation which adds to the integrity of the storage complex. After producing over 1.05 trillion cubic feet of gas in its 31-year history, Viking South has a theoretical storage capacity of between 79 and 88 million tonnes of CO 2 . Viking South is one of the UK's most technically mature storage opportunities in the UK and the project is well positioned to help decarbonise the Humber region.
Underhill et al. (Mon,) studied this question.