FLADEN GP

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• Generell informasjon

  Generell informasjon

  Attributt	Verdi
  Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.	FLADEN GP
  NPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.	205
  Nivå Angir den litostratigrafiske enhetens nivå. Lovlige verdier: GROUP, FORMATION, MEMBER.	GROUP

• Nivå under

  Nivå under

  Litostrat. enhet
  RATTRAY FM

• Beskrivelse

  Fladen Group
  
  Name

  From the Fladen Ground Spur, a structural feature.

  Type area

  The group is typically developed in the UK sector of the Central North Sea particularly in the area between the Piper and Forties oilfields.

  Thickness

  Within the volcanic province the thickest section penetrated so far is 1100 m and in this well the base of the volcanic was not reached. A considerable amount of thickness information was presented by Howitt and others (1975).

  Lithology

  The group embraces both volcanic and non-volcanic formations. Therefore the group contains a wide range of lithologies including basalts, tuff agglomerates, and normal continental to shallow water sediments.

  Boundaries

  The group normally rests on pre-Jurassic rocks, frequently Triassic sediments, and the lower boundary is marked either by the incoming of igneous rocks or the change from Triassic continental sediments to paralic sediments containing tuff horizons. The upper boundary is the contact with the marine sediments of the Humber Group. The Piper or Kimmeridge Clay formations may overlie the Fladen Group and in some sections the Heather Formation may be present but as noted earlier the complex interdigitations of the component formations of the Humber Group are not precisely known for this part of the Central North Sea.

  Distribution

  The group is largely restricted to the area of UK quadrants 14, 15, 16, and the more northerly parts of 21 and 22.

  Age

  Middle Jurassic.

  Subdivision

  As noted above the rocks of the Fladen Group are divided into two formations which are essentially end members of an interdigitating sequence. These are named the Rattray and Pentland formations. For present purpose if the encounters section contains more than half volcanic it is assigned to the Rattray Formation while if it contains more than half sedimentary rocks then it is placed in the Pentland Formation. As more data become available it will almost certainly be possible to subdivide the two formations further, and a proper understanding of the relationship between these end members may necessitate revision of the nomenclature in the future.

  Source

  • Deegan, C. E. and Scull, B. J. (compilers) 1977: A standard lithostratigraphic nomenclature for the Central and Northern North Sea. UK Institute of Geological Sciences, Report 77/25; the Norwegian Petroleum Directorate, NPD-Bulletin No. 1, 36 pp.

• Brønnbaner som penetrerer

  Brønnbaner som penetrerer

  Brønnbane navn	Dato for boreslutt	Topp dyp [m]	Bunn dyp [m]
  15/8-1	07.01.1982	4162	4300

• Brønnbaner med kjerner

  Brønnbaner med kjerner

  Brønnbane navn	Dato for boreslutt	Kjernelengde [m]