Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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11.11.2024 - 01:26
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ELDFISK FM

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  • General information

    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    ELDFISK FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    34
    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

    Eldfisk Formation

    Name
    From the Eldfisk Field in Norwegian block 2/7.
    Well type section
    Norwegian well 2/7-3 (Phillips) from 3626 m to 3695m, coord N 56°23'02.9", E 03°14'45.9" (Fig 3.40) .
    Well reference section
    Norwegian well 1/9-3 R (Statoil) from 4359.5 m to 4386.5 m, coord N 56°24'56.2", E 02°54'15.15" (Fig 3.43) .
    Thickness
    69 m in the type well 2/7-3 and 27 m in the reference well.
    Lithology
    The Eldfisk Formation consists predominantly of sandstone but contains substantial interbeds of shale. In the type well the sandstone is dark yellowish brown, fine to coarse grained, poorly sorted and generally angular, while the shale is medium light grey to dark grey. Both the sandstone and the shale contain calcareous streaks which produce high amplitude peaks on the sonic log.
    Boundaries
    The sands of the Eldfisk Formation are entirely enclosed within the thick upper Jurassic shale sequence of the Central Graben. The Eldfisk Formation is therefore easily distinguished from the underlying Haugesund Formation and the overlying Farsund Formation by its lower gamma ray readings.
    Distribution
    As defined at present, the main development of the Eldfisk Formation is confined to the region of the Eldfisk Field , although thin time equivalent sands are present in other parts of the Central Graben.
    Age
    Kimmeridgian.
    Depositional environment
    The Eldfisk Formation represents an influx of sand into the axial portions of the Central Graben at a time of regression, and for this reason it is postulated that the formation is turbiditic in origin. However, no conventional cores have been taken in the sands and there is no definitive sedimentological evidence.
    Source
    • Vollset, J. and Doré, A. G. (eds.) 1984: A revised Triassic and Jurassic lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin No. 3, 53 pp.
  • Wellbores penetrating

    Wellbores penetrating
    Wellbore name
    Wellbore completion date
    Top depth [m]
    Bottom depth [m]
    30.09.1978
    4360
    4387
    08.11.2019
    4162
    4168
    11.10.1972
    3626
    3695
    02.06.1980
    4133
    4181
    31.03.1991
    4940
    5177
    07.08.1992
    3498
    3518
    06.01.1994
    4473
    4602
    06.01.1994
    4664
    4698
    28.06.1978
    2795
    2817
    20.08.1978
    3172
    3183
  • Wellbores with cores

    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]
    31.03.1991
    26
    07.08.1992
    4
    06.01.1994
    89