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Geological Conditions for Offshore Wind Turbine Foundations at the Sørlige Nordsjø II site, Norwegian North Sea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE GET 2022, Nov 2022, Volume 2022, p.1 - 5
Abstract
Summary
A better understanding of how offshore wind turbine foundations interact with geological substrates is required to optimize design and reduce costs. An important component of this will come from developing a more detailed geological and geotechnical understanding of the foundation substrates within new offshore wind areas, such as the Norwegian North Sea. In this study, we focus on the geological conditions at the Sørlige Nordsjø II site, located along the southern border of the Norwegian North Sea. We present a conceptual geological model which combines an overview of previous knowledge about the geological history of the southern North Sea with observations from bathymetric data, 2D and 3D seismic data, and recently acquired sub-bottom profiles and shallow cores collected from the site in June 2022 by the University of Bergen. Based on our preliminary analyses, five main geological units are defined: 1) homogeneous and layered marine sands covering most of the site, with patchy distribution in the east, 2) buried estuarine channel deposits containing organic material and associated biogenic gas, 3) buried, stiff glacilacustrine clay deposits, 4) buried glacitectonized glacimarine-marine sands and 5) mounded glacial tills/glacitectonized deposits containing boulders, exposed in the east.
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