KUPFERSCHIEFER FM
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.KUPFERSCHIEFER FMNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.88Nivå 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
Kupferschiefer Formation
NameAn old German mining term meaning “Copper Shale”.Well type sectionUK well 49/26-4 (Shell/Esso) (see Rhys, 1974) from 2012 to 2013 m.Well reference sectionThe formation is illustrated in the following wells which may be considered as reference sections. UK wells 30/16-1 (Shell/Esso) (Fig 1.5-8) . 21/11-1 (Shell/Esso) (Fig 1.5-8) and 15/26-1 (BP) (Fig 1.9-11) . Norwegian wells 7/3-1 (Amoco/Noco) (Fig 1.5-8) . and 17/4-1 (Petronord) (Fig 1.9-11) .Thickness1 m in the type well. In the reference wells it is 1 to 2 m thick and appears to be of the same order of thickness throughout the North Sea Basin. Although typically about 1 m or less in thickness, it can be overlain by additional shale to reach a combined thickness of 10 m; it then loses its sharp spike.LithologyThin, grey-black, radioactive, locally calcareous organic-rich shale. In the type well it is a dark brown to black dolomitic shale. In the reference wells it is dark grey to black, carbonaceous and micaceous shale, usually laminated and fissile.BoundariesThe formation is easily distinguished on wireline logs by a very high gamma ray response and low acoustic velocities. Since it normally occurs between the arenaceous sediments of the Rotliegend Group and the carbonates and evaporites of the Zechstein Group it forms a distinctive marker horizon.DistributionDespite the fact that the formation is very thin it is widely distributed over the Southern and Central North Sea. The Kupferschiefer Formation can be very thin or even absent over local highs and in marginal areas of local paleorelief. It is present on land in the UK and northern Europe.AgeLate Permian.Depositional environmentMarine, anoxic basinal environment.Compiled from:-
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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Glennie, K. W., Higham, J. and Stemmerik, L. Permian. 91 – 103 in: Evans, D., Graham, C., Armour, A. and Bathurst, P. (editors and coordinators) 2003: The Millennium Atlas: petroleum geology of the central and northern North Sea. The Geological Society of London, 389 pp.
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