JORSALFARE FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.JORSALFARE FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.74Level Indicates the lithostratigraphic unit's level. Legal values: GROUP, FORMATION, MEMBER.FORMATIONLithostrat. unit, parent The parent lithostratigraphic unit's official name. See also level. Will be empty if Level = GROUP. -
Level below
Level below Lithostrat. unit -
Description
Jorsalfare Formation
NameNamed after Sigurd "Jorsalfare" Magnusson, a Norwegian king (A.D. 1103-1130).Well type sectionNorwegian well 25/1-1 from 2997 m to 2711 m, coordinates N 59°53'17.40", E 02°04'42.70" (Fig 5.33) . One core (17 m) in the middle of the formation and another (4 m) at the base.Well reference sectionsNorwegian well 35/3-2 from 1665 m to 1520 m, coordinates N 61051'05.98", E 03°46'28.22" (Fig 5.34) . No cores. Norwegian well 24/9-1 from 3117 m to 2752 m, coordinates N 59°16'09.48", E 01°47'31.18" (Fig 5.35) . No cores.ThicknessThe formation is 286 m thick in the type well ( 25/1-1 ), 145 m in well 35/3-2 and 365 m in well 24/9-1 .LithologyThe formation generally consists of mudstones interbedded with thin limestone beds. The mudstones are light to medium grey, often calcareous. The limestones are white to light grey, fine grained, occasionally sandy and dolomitic.Basal stratotypeThe lower boundary is defined by a decrease in gamma-ray intensity and an increase in velocity, reflecting an increase in calcareous content from the Kyrre Formation into the Jorsalfare Formation (Fig 5.33 , 5.34) . In the Tampen Spur area, however, the boundary may be difficult to identify due to small differences in calcareous content. The lower boundary may be unconformable above the Jurassic sequences (e.g. in the Gullfaks area).Characteristics of the upper boundaryThe upper boundary may be towards the Våle , Lista or Ty formations of the Rogaland Group . When the upper boundary is towards the shale of the Lista Formation it is usually characterised by an upward increase in gamma-ray intensity and a distinct drop in velocity (Fig 5.34) . When it is towards the Våle Formation it does not show the same distinct drop in velocity and increase in gamma-ray intensity, because the overlying lithology consists of limestones or calcareous mudstones (Fig 5.35) . Where the upper boundary is towards the Ty Formation it is identified as a change to sandstone (Fig 5.33) .DistributionThe formation is present in the Viking Graben and on the Tampen Spur. Its boundaries towards the Jorsalfare Formation in the Viking Graben, the Hardråde Formation on the Horda Platform and the Tor Formation on the Utsira High are illustrated in (Fig 5.32ab) .
The main characteristics that can be used to distinguish the three formations are:-
The Jorsalfare Formation contains shales with thin limestone beds which are usually no thicker than 5 m.
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The Hardråde Formation contains thick limestone beds (10-60 m), as well as shales, except in the Troll area where it is thin and may consist of only a single bed of limestone or marly limestone.
Separation of these three formations may be difficult in transitional areas.AgeLate Campanian to Maastrichtian.Depositiohal environmentOpen marine.RemarksThe Jorsalfare Formation is time-equivalent with the Hardråde and Tor formations of the Shetland Group and also with the informal ”formation E” 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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Wellbores penetrating
Wellbores penetrating 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Wellbores with cores