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 10 9 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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