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Near-Surface Effect on Geological CO2 Storage Site Characterization in Denmark
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, The Fourth EAGE Global Energy Transition Conference and Exhibition, Nov 2023, Volume 2023, p.1 - 5
Abstract
Summary
This study focuses on the characterization and effect of near-surface materials at a potential geological carbon storage (GCS) site in Denmark. The seismic data, acquired using a dual seismic acquisition setup comprising 10-m-spaced wireless units and 2-m-spaced landstreamer microelectromechanical units (MEMs), provided high-quality reflections that can be associated with lithological units that are important for GCS such as the Gassum Formation that is the prime target reservoir. However, near-surface materials and their heterogeneity pose challenges for obtaining an accurate near-surface velocity model and thereby affect the quality of the seismic image. Given the high-resolution aspects of the data and dense receiver spacing, it was possible to overcome near-surface challenges and correct for their effects to obtain a high-resolution image of the deeper reflections of interest, which is a key aspect for GCS applications. The estimated velocity model agrees with expected near-surface sediment velocities, but details in the layers are not fully resolved. Further research will include seismic refraction tomography and the integration of the landstreamer data to obtain an accurate velocity model that will improve the GCS site characterization.
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