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ROTLIEGEND GP

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  • Generell informasjon

    Generell informasjon
    Attributt Verdi
    Litostrat. enhet
    Den litostratigrafiske enhetens offisielle navn.
    ROTLIEGEND GP
    NPDID for litostrat. enhet
    Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.
    136
    Nivå
    Angir den litostratigrafiske enhetens nivå. Lovlige verdier: GROUP, FORMATION, MEMBER.
    GROUP
  • Nivå under

    Nivå under
    Litostrat. enhet
  • Beskrivelse

    Rotliegend Group

    Name
    An old German mining term referring to the ore-free, frequently red-coloured rocks of continental origin (New Red) beneath the Kupferschiefer (Copper Shale).
    Type area
    Well 7/3-1 (Amoco/Noco) (Fig 1.5-8) . and well 17/4-1 (Petronord) (Fig 1.11) , illustrate the lithology of the Rotliegend Group in the Norwegian sector.
    Thickness
    The thickness of the Rotliegend is quite variable, with a maximum in UK waters of over 525 m in well UK 29/18-1. There are few complete penetrations of the Rotliegend Group in Danish and Norwegian waters with maximum penetrations of 380 m reached in well 2/1-7 and 369 m in Elna-1; in neither well was the base Rotliegend reached. Other penetrations in Norwegian wells are 293m in well 7/3-1 , 218m in 2/7-31 .
    Lithology
    The Rotliegend Group consists of a sequence of clays, shales, sandstones and minor conglomerates deposited in a continental environment. Volcanic rocks including tuffaceous sediments are common in the lower part. The sediments are frequently red, and diagnostic floras are rare resulting in poor chronostratigraphic control. In well 7/3-1 the rocks are described as a continental red-bed sequence of reddish brown, very fine grained sandstone, argillaceous in part, with variable amounts of siliceous and carbonate cements. Dark, red micaceous non-calcareous shales are interbedded with the sandstone and become more common towards the base where the whole section becomes finer grained. In well 17/4-1 rocks of probable Rotliegend age include conglomerate with pebbles of quartzite, gneiss, acid volcanic rocks and mica schist in a well-cemented argillaceous and sandy matrix.
    Boundaries
    The Rotliegend Group normally rests on metamorphic basement, Devonian or Carboniferous rocks. It is mostly overlain by the thin Kupferschiefer (Copper Shale) and the Zechstein Group. There is a clear log break when passing from the arenaceous sediments of the Rotliegend Group into the Zechstein carbonates and evaporites or the highly radioactive Kupferschiefer which is developed at the Zechstein base in some wells.
    Age
    Early Permian.
    Distribution
    Although the group has been penetrated in a few wells it is thought to be extensive in the southern part of the Norwegian North Sea, being missing only on local structural highs. Most of these sedimentary rocks are confined within the central North Sea, Inner Moray Firth basin and South Viking Graben areas, and far to the north in the Unst basin. Although Rotliegend sandstones are present in the South Viking Graben, they are absent on the adjacent Utsira High and Horda Platform, in the western part of the Danish central Graben, and along the northern rim of the Mid North Sea - Ringkøbing-Fyn High. On the east side of the South Viking Graben, the whole of the pre-Zechstein sedimentary sequence comprises undated sandstones and conglomerates assigned by the well operators to the Rotliegend Group, although these coarse-grained clastics could have been deposited during the Carboniferous or Devonian, for instance 16/1-3 , 17/4-1 and 25/10-2R .
    Depositional environment
    Continental red-beds (aeolian, fluvial, lacustrine – sabkha) and locally extensive acid volcanics.
    Subdivision
    In the Norwegian sector no subdivision of the group is made.
    Compiled from
    • 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.
    • Glennie, K. W., Higham, J. and Stemmerik, L. Permian. 91 – 103 in: Evans, D., Graham, C., Armour, A. and Bathurst, P. (editors and coordinators) 2003: The Millennium Atlas: petroleum geology of the central and northern North Sea. The Geological Society of London, 389 pp.
  • Brønnbaner som penetrerer

    Brønnbaner som penetrerer
    Brønnbane navn
    Dato for boreslutt
    Topp dyp [m]
    Bunn dyp [m]
    11.02.1985
    4769
    4850
    06.03.1985
    5084
    5464
    29.02.1992
    4520
    5258
    14.03.2008
    5631
    5719
    22.02.2015
    4830
    4889
    18.01.2019
    3680
    3843
    02.03.1971
    3875
    3964
    06.01.1994
    4853
    4900
    09.06.1999
    4750
    4968
    04.09.1979
    4316
    4367
    14.12.1989
    4670
    4859
    04.07.2008
    5450
    5500
    18.09.2014
    3556
    3671
    23.04.1976
    4297
    4529
    25.04.1993
    4128
    4164
    12.03.1987
    4684
    4795
    28.06.1978
    3103
    3426
    20.06.1981
    4166
    4330
    27.05.2019
    3790
    3893
    29.12.2010
    4021
    4070
    10.03.1986
    4045
    4091
    10.06.1969
    4406
    4692
    06.10.2010
    5398
    5738
    01.08.2006
    5279
    5838
    12.09.2007
    1322
    1920
    14.07.1981
    3014
    3044
    24.08.1982
    3068
    3120
    22.12.1980
    4392
    4450
    07.08.1976
    2808
    2912
    27.09.1982
    3230
    3440
    07.12.2012
    2671
    2722
    03.06.2018
    1912
    1915
    01.09.2011
    2244
    2500
    29.09.2012
    2658
    2693
    30.08.2012
    1955
    2035
    12.12.2012
    2165
    2214
    07.03.2013
    1967
    2050
    08.11.2013
    2000
    2089
    01.04.2014
    2069
    2132
    16.03.2014
    2060
    2109
    18.11.1984
    2621
    2885
    01.04.2018
    2069
    2475
    30.03.1982
    3117
    3146
    27.07.1982
    2859
    3141
    01.05.2013
    3015
    3261
    26.08.1968
    3834
    3997
    09.10.1973
    2293
    2300
    08.07.1972
    3014
    3152
    13.06.1981
    2363
    2550
    07.04.1997
    2601
    2653
    02.08.2016
    2668
    2696
    25.09.2015
    2229
    2574
  • Brønnbaner med kjerner

    Brønnbaner med kjerner
    Brønnbane navn
    Dato for boreslutt
    Kjernelengde [m]
    11.02.1985
    9
    06.03.1985
    30
    02.03.1971
    9
    06.01.1994
    19
    09.06.1999
    41
    25.04.1993
    12
    20.06.1981
    9
    10.03.1986
    2
    10.06.1969
    47
    01.08.2006
    19
    14.07.1981
    11
    22.12.1980
    9
    01.09.2011
    27
    29.09.2012
    11
    30.08.2012
    17
    01.04.2018
    8
    26.08.1968
    3
    08.07.1972
    34