Abstract
Three deep wells on the Danish island of Sjælland penetrate the Upper Triassic - Lower Jurassic Gassum Formation. The formation has been the subject of a facies analysis of cored sediments and interpretation of petrophysical logs. The principal part of the work presented is based on data from the Stenlille-1 well. The sediments were deposited in a NW-SE trending, microto mesotidal, prograding coastal zone and the adjacent fluvial hinterland. In the Stenlille-1 well, the coastal progradation is recorded as a thick, coarse-grained sandstone unit deposited within a barrier island complex. This basal part of the formation is overlain by four stacked regressive sequences consisting of finegrained sandstones and mudstones deposited on tidal flats. A thin transgressive sandstone sheet terminates the formation and marks the boundary to marine claystones of the Fjerritslev Formation.
Highlights
In the Stenlille-1 well, the coastal progradation is recorded as a thick, coarse-grained sandstone unit deposited within a barrier island complex. This basal part of the formation is overlain by four stacked regressive sequences consisting of finegrained sandstones and mudstones deposited on tidal flats
The purpose of this paper is to present an interpretation of the depositional environment of the Upper Triassic - Lower Jurassic Gassum Formation carried out on material from the wells Stenlille-1, Slagelse-1, and Lav0-l in the southeastern part of the Danish Subbasin
The interpretations are extended to the whole formation by studying petrophysical log motifs, cuttings samples and sidewall cores, and an interpretation of the depositional environment and the palaeogeography of the formation on Sjrelland is proposed
Summary
AiO Tryk as, Odense Tegning: Eva Melskens and Inge Martin-Legene. Dato: 16.10.1989 Lars Henrik Nielsen; DGU, Thoravej 8, DK-2400 Copenhagen NV. Flemming Larsen; Ramb0ll & Hannemann, sektor Tage S0rensen, Blokken 44, DK-3460 Birker0d. Nils Frandsen; DOPAS, Slotsmarken 16, DK-2970 H0rsholm.
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