GRID FM
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.GRID FMNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.53Nivå 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
Grid Formation
NameNamed after a female giant in Norse mythology, who was one of the wives of Odin.Well type sectionNorwegian well 15/3-3 from 1840 m to 1470 m, coordinates N 58°52'31.25", E 01°46'46.24" (Fig 5.64) . No cores.Well reference sectionsNorwegian well 24/12-1 from 1660 m to 1502 m, coordinates N 59°02'29.80", E 01°52'57.93" (Fig 5.61) . No cores. Norwegian well 24/12-2 from 1397 m to 1282 m, coordinates N 59°12'00.75", E 01°52'53.34" (Fig 5.65) . No cores.ThicknessLithologyThe formation consists of sandstones with interbeds of claystone and siltstone. The sandstones often have a massive, "blocky", appearance as illustrated by type well 15/3-3 (Fig 5.64) . Individual sandstone beds show little, or no evidence of fining-upwards or coarsening- upwards. The sandstones are very fine to fine, sometimes medium to coarse. Sorting is generally moderate to good. Traces of mica, pyrite, glauconite and fossil fragments are common. A higher argillaceous content is found in distal areas. Well 24/12-1 illustrates the interfingering of thicker claystone units of the Hordaland Group with the Grid Formation (Fig 5.61) . Further subdivision may be possible in the future (see Remarks).Basal stratotypeThe lower boundary shows a decrease in gamma-ray response and an increase in velocity from the Hordaland Group into the sandstones of the Grid Formation (Fig 5.64) .Characteristics of the upper boundaryThe upper boundary is characterised by an increase in gamma-ray readings and a decrease in velocity from the sandstones of the Grid Formation into the clay-stones of the Hordaland Group (Fig 5.64) .DistributionThe sandstones were probably derived from the East Shetland Platform and the formation is recognised in the Viking Graben area between 58°30'N and approximately 60°30'N (Fig 5.66) . A depocentre lies in Norwegian block 15/3 where the formation reaches a thickness of nearly 400 m. It thins eastwards and is not penetrated by wells on the Utsira High. It has been identified in some wells in the Oseberg area. In the Viking Graben north of 61° N, several sandstone bodies occur in the Hordaland Group at the same level, but it is uncertain whether they belong to the Grid Formation.AgeDepositional environmentThe formation is thought to have been deposited in an open marine environment during a regressive period. An eustatic fall in sea level in the Late Eocene is indicated by Haq et al. (1987).RemarksThe formation comprises a series of sand bodies which interfinger with claystones. There is a considerable increase in thickness from less than 200 m north of 59° N (e.g. wells 24/12-1 and 24/12-2 ) to nearly 400 m south of 59° N (e.g. well 15/3-3 ). This is not due to a general increase in thickness, but rather to sand deposition having started earlier in the south. This could give grounds for erecting two formal units, a lower one confined to the area south of 59° N and probably of Middle Eocene age, and an upper one. In some areas the lower unit is separated from the upper one by a sequence of claystones which is referred to informally as the Belton member in the UK sector. However, lithological uniformity renders such subdivision impractical at present.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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