Regional sedimentology and petroleum geology of marine,late Bathonian-Valanginian sandstone in the North Sea |
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| Institution: | 1. A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;1. Department of Geology, St. Lawrence University, Canton, NY 13617, USA;2. Emeritus, Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, USA;3. Department of Geology, Croatian Geological Survey, 10000 Zagreb, Croatia;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China;4. State Key Laboratory for Mineral Deposits Research and School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Road, Nanjing 210023, China |
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| Abstract: | A large number of marine, late Bathonian-Valanginian sandstone units have been identified in the North Sea, north of the Mid North Sea High. This paper discusses their complex areal distribution and outlines sedimentological models. The sandstone formations are interpreted as shallow marine, transgressive and regressive units interbedded with beach, lagoonal and coastal plain deposits. Coarse grained scarp fed fans occur along fault-controlled rift margins.The total proven recoverable reserves in these sandstone reservoirs are 2.3 x 109 ton oil equivalent, of which approximately one third is oil. The play types are intimately linked with the Mesozoic rift system of the Viking, Witch Ground and Central Grabens. Along this rift system the sand units provide good trapping potential and they are generally interbedded with or lie immediately below the Kimmeridgian-Ryazanian source rocks, so that migration paths are relatively simple and migration efficiency is high. |
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