Geometry and segmentation of an evaporite-detached normal fault array: 3D seismic analysis of the southern Bremstein Fault Complex,offshore mid-Norway |
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| Institution: | 1. Basin Studies and Petroleum Geoscience, SEAES, University of Manchester, Williamson Building, Oxford Road, Manchester M13 9PL, England, UK;2. Department of Earth Science and Engineering, Imperial College, London SW7 2BP, England, UK;3. Department of Earth Science, University of Bergen, Norway;4. Statoil, Mølnholtet 42, 9414 Harstad, Norway;5. Statoil Research Centre, Bergen, Norway;1. Division of Materials Science and Engineering, Hanyang University, Seoul 133-791, Republic of Korea;2. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;3. Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan;1. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, TX, 78713-8924, USA;2. Basins Research Group (BRG), Department of Earth Science & Engineering, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom;3. Departamento de Geodinamica and Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Universidad de Granada, Campus Fuentenueva, 18071, Granada, Spain;1. Department of Orthopedic Surgery, Holbæk Hospital, Holbæk, Denmark;2. Department of Orthopedic Surgery, Rigshospitalet, Copenhagen, Denmark;3. The Danish Patient Compensation Association, Copenhagen, Denmark;4. Department of Orthopedic Surgery, Næstved Hospital, Næstved, Denmark;1. Basins Research Group (BRG), Department of Earth Science and Engineering, Imperial College, South Kensington Campus, Prince Consort Road, London, SW7 2BP, UK;2. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, TX 78713-8924, USA;3. Department of Earth Science/Natural History Collections, University of Bergen, Allégaten 41, 5008 Bergen, Norway |
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| Abstract: | The Halten Terrace, offshore mid-Norway, is underlain by a Triassic evaporitic package that is rheologically weak, and led to decoupling of fault systems during Middle Jurassic to Early Cretaceous rifting. We use 2D and 3D reflection seismic data, constrained by wells, from the southern Bremstein Fault Complex of the Halten Terrace to map faults and key stratigraphic horizons, and analyse throw variations along faults, allowing us to constrain patterns of fault segmentation and linkage within the complex. The Bremstein Fault Complex has an overall tilted monoclinal geometry with localised fault systems at base salt level associated with overlying, highly distributed systems of normal faults. Vertical strain partitioning across the evaporite package means that sub-evaporite and supra-evaporite fault populations acted as semi-independent fault systems. Supra-evaporite faults are partly gravity-driven, and controlled by sub-evaporite faulting and consequent tilting of the evaporitic package. This behaviour leads to a wide variety of possible vertical linkage patterns of faults across the evaporite package. A greater variety of lateral segment linkage patterns occurs in evaporite-detached normal fault systems than in normal fault systems developed in the absence of evaporite units. Segment boundary styles can also be modified by migration of evaporite. Some segment boundaries are associated with a footwall anticline and hanging-wall syncline, in contrast to the footwall synclines and hanging-wall anticlines widely described in studies of normal fault systems. |
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| Keywords: | Normal faults Salt Detachment Halten terrace |
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