Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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04.11.2024 - 01:25
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TEIST FM

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  • General information
    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    TEIST FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    166
    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
    Teist Formation (informal)

     Name
    From the bird (English: black guillemot) of the same name.
    Well type section
    Norwegian well 33/12-5 (Mobil) from 3867 m to TD (4573 m), coord N 61°11'05.53", E 01°51'53.34" (Fig 3.2) .
    Well reference section
    Norwegian well 33/5-1 (Norsk Hydro) from 3298 m to TD (3829 m), coord N 61°44'46.10'', E 01°34'47.40" (Fig 3.3) .
    Thickness
    The base of the formation has not been reached. Minimum thickness is 706 m in the type well and 531 m in the reference well.
    Lithology
    The Teist Formation consists of interbedded sandstone, claystone and marl. The sandstones are dominantly very fine to fine-grained, dark red brown and calcareous. In addition white and pink, medium to coarse sandstone is present in the upper levels of the succession. Red marl forms the main argillaceous lithology with green and dark grey claystone as subordinate constituents. In the type well ( 33/12-5 ) the formation is a gradual coarsening upward succession with an upward increase in sandstone/ shale ratio. To the north, in the reference well ( 33/5-1 ), fine-grained sandstone is the dominant lithology throughout most of the formation except for the lowermost 24 m which consist of a red marl.
    Boundaries
    The lower boundary has not been penetrated. The Teist Formation remains as an informal unit until a satisfactory base is defined. The upper boundary marks the base of the coarser-grained, cleaner and more massive sandstones of the Lomvi Formation . The Teist Formation is characterized by a more irregular gamma ray response with higher readings than the overlying Lomvi Formation . In the northern area, the boundary is also marked with a sonic log break.
    Distribution
    The Teist Formation has been recognized in all deep wells between the Brent Field and the southern edge of the Møre Basin.
    Age
    Probably early Triassic (?Scythian) in well 33/5-1 to late Triassic (Carnian) in well 33/12-5 .
    Depositional environment
    The formation is probably of continental origin, and the sandstones may include both fluvial and eolian deposits. The finer-grained lithologies are assigned to overbank and lacustrine environments.
    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]
    12.04.2009
    4222
    4335
    10.06.2015
    3276
    3530
    18.10.1979
    3298
    3829
    21.02.1976
    3867
    4574
    16.12.1979
    2894
    2916
    03.02.1983
    3228
    3800
    27.03.1986
    3231
    3282
    30.05.1985
    3632
    3685
    15.11.2015
    3610
    3875
    06.11.1987
    3628
    3850
    20.10.2012
    2783
    2925

  • Wellbores with cores
    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]
    20.10.2012
    14