MIME FM
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.MIME FMNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.106Nivå 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
Mime Formation
NameNamed after a god from Norse mythology who was considered to be very wise.Well type sectionNorwegian well 34/10-18 from 2351 m to 2340 m, coordinates N 61°14'22.48", E 02°03'18.83" (Fig 5.16) . Cores (lower half of the formation).Well reference sectionNorwegian well 17/4-1 from 2122 m to 2080 m, coordinates N 58°35'54.00", E 03°16'05.00" (Fig 5.17) . No cores.ThicknessIn the type well the Mime Formation is 11 m, and in the reference well it is 42 m thick. Usually, the thickness varies between 5 and 20 m.LithologyThe formation is dominated by limestones and marls. It often contains impure carbonates that are reworked and mixed with smaller quantities of sand and silt. The formation is sometimes chalky. The matrix is usually very calcareous. Oolites are observed in some wells in the East Shetland Basin. The colour is usually white or light pink, but may vary slightly on account of the sand/silt mixture.Basal stratotypeIn those wells where the Mime Formation is present it defines the lower boundary of the Lower Cretaceous, lying on the Upper Jurassic sediments or older rocks. This boundary is always an unconformity and can most often be seen on the logs as a decrease in gamma-ray readings and an increase in velocity upwards from the underlying Jurassic sediments.Characteristics of the upper boundaryThe upper boundary is usually defined at the bottom of more or less calcareous shales in the Åsgard Formation . This boundary is reflected on the logs as an upward increase in gamma-ray readings and a reduction in velocity (Fig 5.17) . The upper boundary can also be defined by the overlying shales of the Sola or Rødby formations. The boundary will normally be reflected on logs as described above (Fig 5.16) .DistributionThe formation is found only as narrow zones along structural highs. On the flanks of the Viking Graben it may be seen almost continuously from approximately 58° to 62° N. It is also found as a thin carpet over most of the East Shetland Basin and along the Fladen Ground Spur, the Utsira High-Lomre Terrace, the northwest side of the Sele High, and the Jæren High.
The formation is not encountered in the more central parts of the basins, and it is doubtful if it is present along the boundaries of the Fennoscandian Shield.AgeThe formation is time-transgressive, and is dated to Late Valanginian to Albian. It is oldest in the deeper parts along the basin margins and becomes younger up along the flanks. In most of the East Shetland Basin, along the Utsira, Bergen, Sele and Jæren highs, and along the flanks of the Viking Graben, it is usually of Barremian/Hauterivian age (Fig 5.4) .Depositional environmentPalaeontological investigations together with the observation of oolites indicate a transgressive, shallow marine, depositional environment.RemarksHesjedal & Hamar (1983) described the impure, reworked limestones resting directly on the Base Cretaceous unconformity over the structural highs, as the Utvik Formation. This formation is formally defined as the Mime Formation in this paper, since the name suggested was not in accordance with existing recommendations.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.
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Brønnbaner som penetrerer
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Brønnbaner med kjerner
Brønnbaner med kjerner 10.06.2015308.06.1992520.01.1993223.10.2014627.03.1986113.08.1990127.12.1991327.08.1992212.02.19932020.05.1994426.02.1998602.02.1998914.04.1998530.08.19837