By Michael Ashton, Geological Society of London
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It is partially overlain by a Triassic collapse zone (Walker & Cooper 1987) and Zechstein salt swell which create problems with seismic depth conversion and imaging, rendering seismic delineation and detailed mapping of the structure 34 R. LAHANN E T AL. Lt I,. ~Vikin! ~--"~ I! W. Vulcan~"~ ~ . ,,_ / I I I I ~ Dotty ~x! - "~ "%_-'~ ,_~_K~_ ~ Leman ! Hewett ! ,. J . . Great _ Yarmouth /- ~152 53 / ! / Fig. 1. Location map for the Vanguard Field, UKCS. 5 Mile I1 KM -8600' Fig. 2. Structure map at top Rotliegendes for the Vanguard Field.
Braithwaite 1989). However, this is not compatible with the sedimentological model. Nevertheless, these textures are extremely interesting and warrant further investigation. Fractures parallel to bedding are usually pure calcite, but a second generation of fractures (at some angle to bedding) filled with ferroan calcite is also observed. In some cases, vertical fractures are infilled with sediments. This is also described macroscopically. This clearly indicates that some fracturing of the cements has occurred prior to subsequent sedimentation and therefore dates cementation as indeed occurring at a very early stage.
1989. Displacive calcite and grain breakage in sandstones. Journal of Sedimentary Petrology, 59, 258-266. BRYANT, I. , KANTOROWlCZ, J. D. & LOVE, C. F. 1988. The origin and recognition of laterally continuous carbonate-cemented horizons in the Upper LiPs Sands of southern England. Marine and Petroleum Geology, 5, 108-133. GREY, D. I. 1987. Troll. In: SPENCER, A. M. ) Geology of Norwegian Oil and Gas Fields. Norwegian Petroleum Society, Oslo, 389-401. HALLAM, A. 1987. Eustatic cycles in the Jurassic.
Advances in reservoir geology by Michael Ashton, Geological Society of London