Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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11.12.2024 - 01:27
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STEINKOBBE FM

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  • General information

    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    STEINKOBBE FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    158
    Level
    Indicates the lithostratigraphic unit's level. Legal values: GROUP, FORMATION, MEMBER.
    FORMATION
    Lithostrat. 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

    Steinkobbe Formation

    Name
    Norwegian for “common seal”, “harbour seal” (Phoca vitulina).
    Well type section
    Composite shallow boreholes:
    • 7323/07-U-01, coord N 73°16'42.64'', E 23°02'32.20"
    • 7323/07-U-03, coord N 73°16'33.70'', E 23°03'26.43"
    • 7323/07-U-04, coord N 73°16'37.70'', E 23°02'59.89"
    • 7323/07-U-09, coord N 73°16'51.01'', E 23°01'43.14"
    Thickness
    107 m in the type well.
    Lithology
    The Steinkobbe Formation is dominated by phosphatic, organic-rich mudstone (TOC 1.5 – 9%), but also contains siltstone beds. The lower part of the formation contains papery, finely laminated, unbioturbated mudstone. Some bioturbation occurs higher up where it partly disturbs the lamination. Phosphate nodules are abundant, both globular and flattened, and are commonly a few centimetres in diameter, although individual nodules may reach larger diameters than the drill core (>5cm). There are also thin beds of carbonate cemented siltstone. Pyrite is abundant throughout the unit. Siltstone dominate in the middle part (7323/07-U-01 and -07), where ripples are developed locally. Flattened bivalves and ammonoids occur commonly.
    Basal Stratotype
    The base is defined at 107.05 m in core 7323/07-U-03, where black organic-rich mudstone conformably overlies siltstone of the Klappmyss Formation . At this level there is an aprupt increase in both gamma radiation and organic content.
    Distribution
    Offshore unit, known from the Svalis dome.
    Age
    Spathian – Anisian, based on ammonoids and palynology.
    Depositional environment
    The Steinkobbe Formation is a facies equivalent of the Botneheia Formation and represents deep, mostly restricted, open shelf environments.
    Correlation
    The lithology and organic content as well as the depositional environment of the Steinkobbe Formation are similar as in the Botneheia Formation. The phosphatic, organic-rich sedimentation, however, started earlier in the Svalis Dome area (Spathian) and also ceased earlier than in Svalbard. The lack of evidence for spatial continuity from the Svalis Dome to Svalbard, and the different age of the lower boundary, suggest retention of separate formational names.
    Compiled from
    • Dallmann, W. K. (ed.) 1999: Lithostratigraphic lexicon of Svalbard. Review and recommendations for nomenclature use. Upper Palaeozoic to Quaternary Bedrock. Norwegian Polar Institute, 318 pp.
  • Wellbores penetrating

    Wellbores penetrating
    Wellbore name
    Wellbore completion date
    Top depth [m]
    Bottom depth [m]
    01.12.2020
    1418
    1435
    02.08.2016
    1693
    1969
    28.05.2021
    2272
    2391
  • Wellbores with cores

    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]