SKADE FM
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.SKADE FMNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.145Nivå 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. -
Nivå under
Nivå under Litostrat. enhet -
Beskrivelse
Skade Formation1)
NameNamed after a female giant in Norse mythology, the wife of the god Njord.Well type sectionNorwegian well 24/12-1 from 1007m to 851 m, coordinates N 59°02'29.80", E 01°52'57.93" (Fig 5.61) No cores.Well reference sectionNorwegian well 15/9-13 from 1224 m to 1143 m, coordinates N 58°22'25.96", E 01°56'02.86" (Fig 5.67) . No cores.ThicknessThe Thickness is 156 m in the type well and 81 m in the reference well. It reaches nearly 200 m in Norwegian block 15/3, but is usually around 50-100 m. The formation shows a general eastward thinning.LithologyThe formation consists of marine sandstones with thin claystone interbeds. The sandstones are clear to light grey, usually fine to medium, occasionally coarse grained, with subrounded to rounded grains which are moderately to well sorted. Traces of fossils, shell fragments, mica and abundant glauconite occur. In some wells the sandstones are interbedded with silty claystones as illustrated by reference well 15/9-13 (Fig 5.67) . The formation often interfingers with the unnamed claystones of the Hordaland Group .Basal stratotypeThe lower boundary shows a decreasing gamma-ray response from the underlying claystones into the sandstones of the Skade Formation. The velocity log usually records no distinct break (Fig 5.61) .Characteristics of the upper boundaryThe gamma-ray response increases from the sandstones of the Skade Formation into the overlying claystones of the Hordaland Group . The velocity log usually records no distinct break (Fig 5.61) . Where the Skade Formation is directly overlain by the Utsira Formation the boundary is normally a break on the velocity log.DistributionThe formation has been identified in the Viking Graben area between 58° N and approximately 60°30' N (Fig 5.66) . Several sandstones occur in the upper part of the Hordaland Group in wells to the north and northeast of the known distribution area of the formation, and it may be present in these areas, but identification is difficult.AgeLate Oligocene.Depositional environmentThe formation is thought to have been deposited in an open marine environment as a response to a fall in sea level. A globally low sea level during the late Oligocene is indicated by Haq et al. (1987).Source-
Isaksen, D. and Tonstad, K. (eds.) 1989: A revised Cretaceous and Tertiary lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin No. 5, 59 pp.
Footnotes-
1) An error in the definition of the Skade and Utsira formations, in the type wells area in the Viking Graben, is reported by Rundberg and Eidvin (2005) and Eidvin and Rundberg (2007; see Utsira Formation ). According to Eidvin and Rundberg (2007), Rundberg and Eidvin (2005) and T. Eidvin (unpublished investigations) the Skade Formation is re-dated to Early Miocene age (about 22-15 Ma). Several well reports and composite logs include older Oligocene Sands in the "Skade Formation". These sands are denoted as "Unnamed Oligocene Sand Mb" by Rundberg and Eidvin (2005) and Eidvin and Rundberg (2007). In some wells in the NPD-factpages we have taken into account the new investigations of the Skade and Utsira formations of Rundberg and Eidvin (2005) and Eidvin and Rundberg (2007), while most still follow the definition by Isaksen and Tonstad (1989).
References-
Eidvin, T. and Rundberg, Y., 2007: Post-Eocene strata of the southern Viking Graben, northern North Sea; intergrated biostratigraphic, strontium isotopic and lithostratigraphic study. Norwegian Journal of Geology 87, 391-450. Link
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Rundberg, Y. and Eidvin, T., 2005: Controls on depositional history and architecture of the Oligocene-Miocene succession, northern North Sea Basin. In B.T.G. Wandaas et al. (eds.): Onshore-Offshore Relationships on the North Atlantic Margin. NPF Special Publication 12, 207-239.
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Brønnbaner som penetrerer
Brønnbaner som penetrerer 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Brønnbaner med kjerner