CO₂ storage potential in Denmark ‒ Scientific results and perspectives from investigations of selected geological structures in the CCS2022‒2024 project

Geological storage of CO₂ is an important method for reducing greenhouse gasses as described by UN’s Climate Panel (IPCC, 2005) and is a part of the Danish Government’s climate efforts following the Danish Climate Act from 2020 with an aim of net zero emission of greenhouse gas in 2050. Therefore, GEUS has investigated large deep structures for potential CO2 storage in a comprehensive three-year research project (Gregersen et al., 2025). This CCS2022–2024 project was carried out for five onshore structures (the Stenlille, Havnsø, Rødby, Gassum and Thorning structures) and three offshore-nearshore structures (the Inez, Lisa and Jammerbugt structures) (Figure 1). New seismic surveys were acquired in collaboration with partners mainly from Uppsala University (onshore) and BGR and Aarhus University (offshore). The subsequent investigations describe and define the structures with their geometry, larger faults, key reservoirs and seal formations, as a thorough initial maturation for the authorities. Reports, assessments and data are publicly available. The reports, the new seismic data and seismic interpretations provided new knowledge of the structures, most of which were poorly known previously. The significant new scientific key results of this major project are presented.