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Conference Paper

Understanding North Sea seismicity for risk mitigation of large-scale CO2 injections

Authors

Kühn,  Daniela
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Martuganova,  Evgeniia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Kettlety,  Tom
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Schweitzer,  Johannes
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Baptie,  Brian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dahl-Jensen,  Trine
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rane,  Hannah
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jerkins,  Annie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fellgett,  Mark
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hopper,  John
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Weemstra,  Cornelis
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Kühn, D., Martuganova, E., Kettlety, T., Schweitzer, J., Baptie, B., Dahl-Jensen, T., Rane, H., Jerkins, A., Fellgett, M., Hopper, J., Weemstra, C. (2023): Understanding North Sea seismicity for risk mitigation of large-scale CO2 injections, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0566


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016923
Abstract
Carbon capture and storage technologies are an essential part of EU’s decarbonisation efforts. Combined with sustainable energy resources, they are necessary to move Europe towards a net zero carbon emissions economy. Containment risk evaluation includes analysing natural seismicity patterns in the North Sea, where several Mt-scale CO2 storage projects are being developed. Within the framework of the ACT project SHARP Storage, an extensive unique earthquake bulletin was compiled using seismicity data from all relevant data centres. The bulletin is stored using the IASPEI Seismic Format (ISF). Preliminary processing included duplicate removal and explosion identification. In total, 15,230 events were recorded between years 1382 and 2022, of which 5,408 were identified as likely or potential explosions. For the remaining events, waveforms are currently being collected as a basis for further analysis, including event relocation and magnitude homogenisation. The magnitude of completeness of this data set varies both spatially and temporally. The most seismically active regions in the study area are the Viking and Central grabens. Coastal areas are populated with more events than the central part of the North Sea due to the denser distribution of seismic stations onshore allowing for the detection of smaller (M<3) magnitude events. Moment tensor inversion, shear-wave splitting measurements, and stress drop analysis will be compared to and complement a review of borehole stress measurements to better gauge the present-day stress field. This is crucial for the understanding of the reservoir and caprock response to large-scale CO2 injection over time.