Accurate near-surface characterization is essential to ensure public safety and operational integrity in geological carbon storage (GCS) projects. This study focuses on imaging of near-surface features within the Havnsø domal structure, a potential GCS site in northern-central Denmark, using seismic data acquired in 2022. We combined high-resolution seismic reflection imaging with first-break traveltime tomography to characterize features and key horizons within Quaternary sediments and the Chalk Group. We achieved more accurate and detailed near-surface sections down to 500 m by migrating and time-to-depth converting seismic sections using the tomographic velocities. This approach, along with superimposed tomography-based models, revealed important features such as buried valleys, Chalk Group horizons, and fault zones. Our results demonstrate that the potential GCS prospect area is suitable for long-term CO2 storage, supported by the lack of major faults in situ and in the vicinity of buried valleys.

Thematic collection: This article is part of the sustainable future of geoenergy in the hands of early career researchers collection available at: https://www.lyellcollection.org/content/geoenergy-early-career-research