| Computer Code: |
VICY |
Preferred Map Code: |
notEntered |
| Status Code: |
Full |
| Age range: |
Berriasian Age (KR)
— Cenomanian Age (KE) |
| Lithological Description: |
The predominant lithology of the Victory Formation is a fine- to medium-grained sandstone. It is locally conglomeratic, frequently calcareous, and micaceous, glauconitic and carbonaceous. Interbedded mudstones are variably coloured, ranging from dark grey carbonaceous shale to grey-green to brown mudstones. Sandstones in the north are less carbonaceous and more glauconitic than sandstones further south. Several thin coals are recorded in the thickest succession, in the south of the area, in 205/25-1. Interbedded limestones reach a maximum thickness of 25 m in 205/23-1 and include both micrites and sandy, shelly limestones with rare grainstones. Ammonites and belemnites are recorded in a nodular packstone in 206/8-4. |
| Definition of Lower Boundary: |
In the south of the area, and within the basin, the Victory Formation rests conformably on the Kimmeridge Clay Formation. This boundary is marked by an abrupt increase in gamma-ray values and decrease in sonic velocity. Along the crest of the Rona Ridge, the Victory Formation lies unconformably on the Devono-Carboniferous sediments of the Clair Group or directly on basement (207/1-2). In both cases there is an abrupt increase in gamma-ray values and sonic velocity. |
| Definition of Upper Boundary: |
In most wells there is an unconformity at the top of the Victory Formation, which is generally overlain by mudstones of the Shetland Group. There is generally a sharp downhole drop in gamma-ray values and an increase in sonic velocity. Locally the Coniacian Dab Limestone Unit occurs at the boundary (e.g. 207/1-2). In the south of the West Shetland Basin, and probably in the basinal areas between wells, the boundary between the Upper Cretaceous and Lower Cretaceous may be conformable. In 205/23-1, the boundary is taken at the base of a low gamma ray, high sonic velocity limestone assigned to the Hidra Formation, with a significant unconformity at the top of the limestone. Close to the Shetland Spine Fault sandstone deposition continued into the Upper Cretaceous Haddock Sandstone Unit. The boundary is taken at the top of a thin limestone which has very high sonic velocity and low gamma-ray values (e.g. 205/30-1). A thin basal conglomerate of limestone clasts occurs at the base of the sandstone. |
| Thickness: |
In the type well the Victory Formation is 209 m thick. In other wells in this northern part of the basin, the succession is much thinner and truncated by unconformities at both the top and base. A more expanded succession may occur close to the Shetland Spine Fault. A similar succession is recorded in the south of the basin with increasing thickness towards the Shetland Spine Fault. A maximum thickness of 1054.5 m is reached in 205/25-1 very close to the fault. |
| Geographical Limits: |
West Shetland Basin. |
| Parent Unit: |
Cromer Knoll Group (CRKN)
|
| Previous Name(s): |
none recorded or not applicable
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Type Section |
North Sea well 207/01- 2: 1537-1746.5 m (5043-5730 ft) (Ritchie et al., 1996). |
| Reference Section |
North Sea well 205/23- 1: 920-1121.5 m (3018-3679 ft) (Ritchie et al., 1996). |
| Reference Section |
North Sea well 205/30- 1: 1494-1886.5 m (4902-6189 ft) (Ritchie et al., 1996). |
| Reference(s): |
| Meadows, N S, Macchi, L, Cubitt, J M, and Johnson, B. 1987. Sedimentology and reservoir potential in the West of Shetland area, UK exploration area. In: Brooks, J, and Glennie, K W (eds.) Petroleum Geology of North-West Europe. (London: Graham and Trotman), 723-736. |
| Waters, C N, Gillespie, M R, Smith, K, Auton, C A, Floyd, J D, Leslie, A G, Millward, D, Mitchell, W I, McMillan, A A, Stone, P, Barron, A J M, Dean, M T, Hopson, P M, Krabbendam, M, Browne, M A E, Stephenson, D, Akhurst, M C, and Barnes, R P. 2007. Stratigraphical Chart of the United Kingdom: Northern Britain. (British Geological Survey.) |
| Ritchie, J D, Gatliff, R W and Riding, J, 1996. 1. Pre - Tertiary lithostratigraphy. In: Stratigraphic Nomenclature of the UK North West Margin. British Geological Survey, Nottingham. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
