SMITH BANK FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.SMITH BANK FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.149Level Indicates the lithostratigraphic unit's level. Legal values: GROUP, FORMATION, MEMBER.FORMATIONLithostrat. unit, parent The parent lithostratigraphic unit's official name. See also level. Will be empty if Level = GROUP. -
Level below
Level below Lithostrat. unit -
Description
Smith Bank Formation
NameThe name is derived from a North Sea bathymetric feature.Well type sectionWell reference sectionNorwegian wells 10/8-1 (Petronord) (Fig 1.12-14) , and 17/10-1 (Norske Shell) (Fig 1.15-16) . The basal part of the formation was not penetrated in 17/10-1 .Thickness599 m in the type well. The formation is thickest in the western part of the Central Graben and thins towards the Norwegian sector as shown in the reference wells.LithologyThe formation consists of a monotonous sequence of brick red, somewhat silty, claystones with a few thin sandstone streaks and some anhydrite bands, especially in the lower part. Minor components, particularly in the Norwegian sector, are conglomerate, dark shale, marl, limestone and dolomite. In some localities sandy units may be present at the base. Over most of the eastern sector of the North Sea these sandy units are local and unconnected but south-eastward they become more continuous.BoundariesIn the type well the formation is overlain unconformably by Middle Jurassic volcanics. Elsewhere in the western and central parts of the Central North Sea overlaying rocks range from Lower Jurassic to Lower Cretaceous. This boundary almost invariably coincides with the highest occurrence of red beds in this section. To the east the top of the formation is the interdigitating contact with the Skagerrak Formation , although on a few structures where the Skagerrak Formation has been eroded away, Jurassic or younger sediments are in unconformable contact with the Smith Bank Formation. The lower boundary is normally conformable with the underlying Permian sediments and there is no major time hiatus (Brennand, 1975). However on some structures the formation may rest on basement rocks of Precambrian or Early Paleozoic age. In the type well (Fig 1.12-14) , and again in 10/8-1 (Fig 1.12-14) . the basal contact is clearly marked by gamma ray and sonic log breaks reflecting the change from the evaporitic Zechstein sequence to the clastic Triassic beds.DistributionThe formation is widely distributed throughout the Central North Sea and probably occurs in Denmark north of the Ringkøbing-Fyn High. Within the Moray Firth Basin Triassic sediments have not been considered in any detail, but Brennand (1975) shows the succession to consist of a basal sandstone unit passing upwards into siltstones and sandy claystones which he considered to represent a marginal facies. It is felt that, while the name Smith Bank Formation can be applied to the complete succession, member names may be needed for the sandstone units.AgeEarly to possibly Late Triassic.Depositional environmentThe formation probably represents a range of distal continental environments where predominantly fine grained clastics were deposited.Source-
Deegan, C. E. and Scull, B. J. (compilers) 1977: A standard lithostratigraphic nomenclature for the Central and Northern North Sea. UK Institute of Geological Sciences, Report 77/25. The Norwegian Petroleum Directorate, NPD-Bulletin No. 1, 36 pp.
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Wellbores penetrating
Wellbores penetrating 24.03.19834620482027.05.19975086520108.03.19935457556502.08.20034911498626.02.19783384354029.03.19804163421903.08.19824470448506.03.19854105433207.05.19974617472527.08.19822995310511.05.19833930410007.06.19883969402003.04.19692832291724.07.19843332337714.03.20085426549630.05.19693256330225.02.19833638372902.06.19903606361518.01.20193545359907.08.19923796383906.01.19944789480014.12.19894600467025.04.19933905406212.03.19874672467414.09.19905537575726.02.19943013307720.08.19783604382528.04.20133680371714.09.20153467351127.05.20193706374113.03.20083421345703.06.20132733300020.02.19903288350025.04.19923347338804.07.19933507356729.08.19732883299712.12.19833767423720.02.19853826440010.06.19824241447820.10.19824145450012.12.19833725475009.03.19864183427110.09.19904395456610.06.20074618467907.06.19814145439307.02.19722727287328.03.20132371240501.07.19692866308117.03.19802795288006.10.20103221339404.03.20142791281004.01.20192954314629.06.19753182381019.05.19682590293901.08.20064638522406.05.19692417269826.06.19761561159717.01.19712749282528.02.1976644193008.06.19933476354025.05.19813676373014.07.19812776296907.11.19813241328923.12.19812830295027.05.19822791325627.06.19823543356324.08.19822705301130.03.19832847312002.03.19843593362209.11.19974097413102.02.19984214425020.03.19943503362627.02.19762868288807.01.19913477357013.05.20212771278407.08.19762620271327.09.19822840308216.02.20142167218321.11.20132095211401.04.20141979198616.03.20141978199318.11.19842337239403.05.20132198223307.03.20162625266830.03.19822692301027.07.19822385279503.08.19842775290003.01.20112553266529.10.19762116230112.07.19683074319901.12.19962626285031.10.19672236225520.08.19952440281126.08.19682532266523.10.20212544265824.03.19693398359130.06.19682315251717.05.19762608264421.06.19723965413320.10.19754261436004.08.19763847400015.11.19773705375025.01.19903887390809.12.19723513406026.03.19814207435503.02.19862651285122.09.19943338339503.08.19973338339519.06.19992028215609.06.19992040209622.04.19952415252502.04.20102368243218.01.201525402597 -
Wellbores with cores
Wellbores with cores 08.03.19931012.03.1987014.09.1990213.03.2008020.02.19901725.04.19922104.07.1993912.12.1983120.02.19853320.10.19821312.12.19831909.03.19862610.09.1990827.05.1982916.03.201415