KOBBE FM
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.KOBBE FMNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.83Nivå Angir den litostratigrafiske enhetens nivå. Lovlige verdier: GROUP, FORMATION, MEMBER.FORMATIONLitostrat. enhet, forelder Den litostratigrafiske enhetens offisielle navn, refererer til forelder. Se også nivå. Vil være tom hvis Nivå = GROUP. -
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Beskrivelse
Kobbe Formation
NameFrom the Norwegian collective name for several seal species common in arctic waters. The unit corresponds to T1-3 or upper Grimsøy Formation of earlier usage.Well type sectionWell 7120/12-2 (Norsk Hydro), coordinates 71°7'30.03"N, 20°48'19.00"E, from 3095 to 2927 m (Fig 4.44) .Well reference sectionWell 7120/9-2 (Norsk Hydro), coordinates 71°29'40.81"N, 20°42'05.38"E, from 4245 m to 3962 m (Fig 4.45) .Thickness168 m in the type well and 283 m in the reference well.LithologyA basal 20 m thick shale unit passes up into interbedded shale, siltstone and carbonate cemented sandstone.Basal StratotypeThe formation is defined by upwards increasing gamma ray, interval transit time and neutron porosity responses into the basal shale. Log responses show much more variation above this unit.Lateral extent and variationThis unit shows a coarser proximal facies development, along the southern margin of the Hammerfest Basin and fines towards the basin axis. The formation thickens northwards from 140 m on the Troms - Finnmark Platform. Thicknesses vary more from platform to basin than in the underlying units.AgeAn Anisian age is suggested by palynomorphs, with a probable break in deposition in the early and/or late Anisian.Depositional environmentA transgressive pulse marking the base of the unit was followed by renewed build-out of clastic marginal marine regimes from southern coastal areas.CorrelationThe base of the formation is a clear regional marker, which elsewhere (on Svalbard and in the Sverdrup Basin) marks the onset of deposition of phosphatic organic rich shales. This facies, well displayed by the Botneheia Member of the Barentsøya Formation in central and eastern Svalbard, has not yet been encountered in the Hammerfest Basin. The Kobbe Formation shows greater similarities to the Bravaisberget Formation of western Spitsbergen.Source-
Dalland, A., Worsley, D. and Ofstad, K. (eds.) 1988: A lithostratigraphic scheme for the Mesozoic and Cenozoic succession offshore mid- and northern Norway. NPD-Bulletin No. 4, 65 pp.
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Brønnbaner som penetrerer
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Brønnbaner med kjerner
Brønnbaner med kjerner 12.10.1980508.01.20062225.11.20062623.12.20061104.01.20132803.05.2015814.06.20152502.09.20151501.12.20202202.08.2016210.03.20081104.11.20083427.02.201416414.01.20091319.06.19881425.09.20111707.08.20137419.07.2008411.04.1988202.02.2001219.08.198914