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Sequence Stratigraphy of the Lower Jurassic Dunlin Group, Northern North Sea

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Identifiers
DOI: 10.1016/s0928-8937(01)80012-6
Disciplines
  • Earth Science

Abstract

Sequence stratigraphic analyses of the Lower Jurassic Dunlin Group of the North Viking Graben provides a consistent basinwide framework for a better understanding of the sedimentary facies distributions. Nine sequences are defined on the basis of temporal changes in depositional environments, extensive biostratigraphic information and log correlation. The bounding surfaces of these sequences represent maximum transgressive surfaces (mts) and mark the points between a series of regionally identifiable regressive-transgressive episodes in the Early Jurassic (latest Sinemurian to Toarcian) interval of the North Viking Graben. The biostratigraphic information has enabled the sequences to be calibrated to standard schemes established elsewhere within the North Sea Basin and the ammonite-dated Lower Jurassic type section on the Yorkshire coast. The sequences have thicknesses of between 10 m and 100 m and a duration of approximately 1-4 Ma. They consist of facies representing deposition in a variety of shelf, shoreline and estuarine systems. The significance of estuarine facies within this interval is highlighted, most notably within the J14 and J15 sequences. The sediments generally have a source direction from the Horda Platform and Lomre Terrace areas on the eastern basin margin. The sandstone distribution within these sequences is primarily controlled by variations in sediment supply, accommodation potential and tectonic subsidence and represents a history of repeated progradation and retrogradation.

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