TRYGGVASON FM
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.TRYGGVASON FMNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.173Nivå 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
Tryggvason Formation
NameNamed after Olav Trygvason, a Norwegian king (A.D. 995-1000).Well type sectionNorwegian well 25/1-1 from 3790 m to 3582 m, coordinates N 59°53'17.40", E 02°04'42.70" (Fig 5.33) . No cores.Well reference sectionsNorwegian well 35/3-2 from 3190 m to 2864 m, coordinates N 61°51'05.98", E 03°46'28.22" (Fig 5.34) . No cores. Norwegian well 24/9-1 from 3783 m to 3638 m, coordinates N 59°16'09.48", E 01°47'31.18" (Fig 5.35) . No cores. Norwegian well 30/11-3 from 3207 m to 3162 m, coordinates N 60°02'38.59", E 02°32'15.47" (Fig 5.36) . No cores.ThicknessIn the Viking Graben, the formation is 208 m thick in the type well ( 25/1-1 ), 326 m in well 35/3-2 and 145 m in well 24/9-1 . It is 45 m thick in well 30/11-3 on the western margin of the Horda Platform.LithologyThe Tryggvason Formation consists generally of mudstones with interbedded limestones. Interbedded sandstones are common in the Agat area. The content of limestones relative to mudstones is generally lower in the northern part of the Viking Graben (from blocks 30/2 and 30/3 northwards) than in the southern part. At the transition between the Viking Graben and the Horda Platform (e.g. block 30/11, (Fig 5.36) , the formation consists of limestone. The mudstones are light to dark grey, often calcareous, occasionally micaceous, glauconitic and pyritic. The limestones are white to light grey or brownish grey and argillaceous. The sandstones are clear to light grey, very fine to fine grained and cemented by calcite.Basal stratotypeThe lower boundary is defined by a decrease in gamma-ray intensity and an increase in velocity from the Blodøks Formation into the Tryggvason Formation (Fig 5.33 , 5.34) . This is due to the difference in carbonate content.Characteristics of the upper boundaryThe upper boundary shows an increase in gamma-ray intensity and a decrease in velocity from the Tryggvason Formation upwards into the Kyrre Formation (Fig 5.33) . This log change is due to the lower carbonate content of the Kyrre Formation .DistributionThe formation is present in the Viking Graben and northern Tampen Spur area towards the Marulk Basin.AgeEarly to Mid Turonian.Depositional environmentOpen marine.RemarksThe Tryggvason Formation is time-equivalent with the Herring Formation and the lower part of the Hod Formation in the central North Sea, and also with the informal “formation C” of Deegan & Scull (1977) (Fig 5.6) .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 09.12.19725