TEIST FM

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• Generell informasjon

  Generell informasjon

  Attributt	Verdi
  Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.	TEIST FM
  NPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.	166
  Nivå Angir den litostratigrafiske enhetens nivå. Lovlige verdier: GROUP, FORMATION, MEMBER.	FORMATION
  Litostrat. enhet, forelder Den litostratigrafiske enhetens offisielle navn, refererer til forelder. Se også nivå. Vil være tom hvis Nivå = GROUP.	HEGRE GP

• Nivå under

  Nivå under

  Litostrat. enhet

• Beskrivelse

  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.

• Brønnbaner som penetrerer

  Brønnbaner som penetrerer

  Brønnbane navn	Dato for boreslutt	Topp dyp [m]	Bunn dyp [m]
  30/5-3 S	12.04.2009	4222	4335
  33/2-2 S	10.06.2015	3276	3530
  33/5-1	18.10.1979	3298	3829
  33/12-5	21.02.1976	3867	4574
  34/4-1	16.12.1979	2894	2916
  34/4-4	03.02.1983	3228	3800
  34/4-6	27.03.1986	3231	3282
  34/7-6	30.05.1985	3632	3685
  34/8-16 S	15.11.2015	3610	3875
  6201/11-1	06.11.1987	3628	3850
  6201/11-3 R	20.10.2012	2783	2925

• Brønnbaner med kjerner

  Brønnbaner med kjerner

  Brønnbane navn	Dato for boreslutt	Kjernelengde [m]
  6201/11-3 R	20.10.2012	14