Abstract
Twentyone sidewall core samples from the lower 56 metres of the Lower Graben Sand Formation in the U-1 well are described with respect to their kerogen content and microflora in order to gain a better understanding of the depositional environment and the age relations. Based on e.g. the inconsistent dinoflagellate cyst occurrences, marginal marine conditions are concluded. The dinoflagellate cysts Pareodinia prolongata, Acanthaulax senta, Scriniodinium crystallinum, Energlynia acollaris, Wanaea thysanota and Hystrichogonyaulax cladophora and the recovered palynomorph assemblage in general permit an age determination as follows: 21 m Callovian undifferentiated, 7.9 m latest Middle Callovian - earliest Late Callovian, 6.1 m latest Late Callovian and 21 m latest Late Callovian? - earliest Early Oxfordian.
Highlights
The primary aim of the present investigation is to focus on the palynostratigraphy and the palynofacies of theLower Graben Sand Formation (Jensen et al 1986) of the U-1 well.Danish central Trough ID 20km JURASSICSTRUCTURAL ELEMENTS----- Legend Normal Fault Reverse faultStrike-slip fault Q Salt structure
The U-1 well is located in the southern part of the Danish Central Trough, about 40 km west of the Ringk0bing-Fyn High, in the Salt Dome Province, fig. 1
The upper boundary of the Lower Graben Sand Formation is placed at 10853 ft. (Jensen et al 1986)
Summary
Lower Graben Sand Formation (Jensen et al 1986) of the U-1 well. The depositional environment and the age of the Lower Graben Sand Formation in general and in the U-1 well in particular have been dealt with previously by e.g. Based on biostratigraphy and lithostratigraphy Michelsen (1976) provisionally assigned a Middle Jurassic age to the Lower Graben Sand Formation in the U-1 well. The depositional environment favoured by Koch et al (1982) is that of a prograding delta (pro-delta clays and distributary mouth bar sands) whereas Koch (1983) suggests a braided river plain. Based on palynology Frandsen et al (1985) refer the upper part of the Lower Graben Sand Formation in the U-1 well to the Callovian. The U-1 well is located in the southern part of the Danish Central Trough, about 40 km west of the Ringk0bing-Fyn High, in the Salt Dome Province, fig. 1
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