EIRIKSSON FM
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.EIRIKSSON FMNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.32Nivå 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
Eiriksson Formation
NameNamed after Leiv Eiriksson, the discoverer of North America in the year 1000, according to the Norse Sagas. He was the son of Eirik Raude.Well type sectionWell reference sectionThickness71 m in the type well. In the reference well the formation is 157 m thick. The thickness is relatively constant over the area of the Statfjord Field but the formation thickens towards the south and west (Fig .17-18) . where sandstone characteristic of this formation occur at lower levels in the section.LithologyIn the type well the formation is characterised by massive sandstone beds, generally correlatable between the wells, interbedded with hard grey shales. The sandstones are white to light grey, medium to very coarse grained with thin horizons of granules, pebbles, and lignite fragments, often concentrated in channels and along cross-bedding foresets. They contain slightly less kaolinite matrix, mica and rock fragments than the sandstones of the Raude Formation . The shales are slightly and commonly micaceous and carbonaceous. In the area of the Statfjord Field the sandstone beds average about 5 m in thickness and the shale beds average about 2.5 m. The sediments of this formation appear more mature than those of the Raude Formation , and marine fossils and glauconite are present near the top of the formation in the type well.BoundariesThe originally Eiriksson Member of the Statfjord Formation was elevated to formation level by Lervik, 2006. There is usually a sharp upward transition from the Raude Formation reflecting a change to a more humid climate as well as a tectonic uplift of the hinterland. Sandstones are more abundant and thicker. The modified climate resulted in a change in the colour of the siltstones and mudstones from red to green and grey, and carbonate nodules and soils that formed in the previous evaporitic environment were replaced by coal- and carbonaceous-rich beds. The lower boundary is formed by the base of the lowest massive sandstone which can be well correlated. The upper boundary is marked by the base of the distinctive sandstones of the Nansen Formation which are frequently calcareous. The Eiriksson Formation has a characteristic blocky gamma ray and sonic log response but the boundaries may not always be marked by prominent log breaks.DistributionThe formation is present over much of the northern North Sea, but not in the southern part of the East Shetland Basin.AgeIn the type well it is Hettangian, possibly extending into the early Sinemurian. However, to the west and south the base of the formation appears to be progressively older.Depositional environmentNystuen and Fält (1995) reported vertically stacked channel-sandstones forming multi-storey sandstone units up to 30-40 m thick. Cross-bedded sandstones with basal channel-lag conglomerates of coarse- to very coarse-grained sandstones with pebbles of quartz and gneiss (Nystuen and Fält, 1995) associated with coal facies are interpreted as having a fluvial origin (Røe and Steel, 1985). Røe and Steel (1985) discussed the sheet-like extent of the sand bodies, interpreting them as having formed in a relatively high-gradient, braided-alluvial setting. The Eiriksson Formation is interpreted as the more proximal braided-stream deposit of a fan-delta system associated with coastal to shallow marine elements. Deegan and Scull (1977) reported marine fossils and glauconite near the top of the fromation in well 33/12-2 , suggesting a marginal marine environment varying from coastal backswamp and river mouth situations to coastal barriers.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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Goldsmith, P. J., Hudson, G. and Van Veen, P. Triassic. 105 – 127 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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Lervik, K.-S. 2006: Triassic lithostratigraphy of the Northern North Sea Basin. Norwegian Journal of Geology, Vol. 86, pp. 93-116.
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