Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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11.12.2024 - 01:27
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TUXEN FM

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  • General information

    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    TUXEN FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    175
    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

    Tuxen Formation

    Name
    Named by Jensen et al. (1986) from a bathymetric feature west of Blavandshuk, the westernmost point of Jylland.
    Well type section
    Danish well I-1 from 2986 m to 2898 m, coordinates N 56°03'10", E 04°14'60" (Fig 5.14) . No cores.
    Well reference sections
    Norwegian well 2/11-1 from 3063 m to 2988 m, coordinates N 56°14'16.98", E 03°27'07.05" (Fig 5.12) . No cores.
    Norwegian well
    2/6-2 from 3935 m to 3864 m, coordinates N 56°30'48.90", E 03°42'39.66" (Fig 5.15) . No cores.
    Thickness
    The thickness of the formation varies from 1 m along structural highs to about 100 m in basinal areas. In the reference wells the thicknesses are 75 m ( 2/11-1 ) and 71 m ( 2/6-2 ). In the type well (I-1) the thickness is 88 m.
    Lithology
    The formation is dominated by white to greyish-pink, calcareous claystones and marlstones. Along some of the structural highs the marlstones grade into purer limestones. Generally, the formation terminates vertically upwards with a chalk sequence containing subordinate marlstone layers. This chalk is white to pale orange or yellowish-grey, occasionally greenish and reddish. The marlstones are generally light grey to greenish-grey or olive-grey, but may be reddish-brown in some wells.
    A 0.3-1 m thick, radioactive, marlstone bed is frequently encountered within the Tuxen Formation in the Danish sector where it is defined as the Munk Marl Bed. This characteristic unit has also been recognised in some wells in the central Norwegian sector (e.g.
    2/1-2 , 2/1-3 , 2/1-8 , 2/6-2 , 2/11-7 , 6/3-1 , 16/8-1 and 16/10-1 ), (see also (Fig 5.15) . In the Norwegian sector, the Tuxen Formation above the Munk Marl Bed is often more calcareous than the rest of the sequence.
    Basal stratotype
    The lower boundary is defined as the base of an upward decrease in gamma-ray readings and an increase in velocity, reflecting the passage from the slightly calcareous claystones of the underlying Åsgard Formation up into the more calcareous claystones and marlstones of the Tuxen Formation (Fig 5.12 , 5.14 , 5.15). The transition is generally gradual in basinal areas. Purer limestones were deposited along some structural highs, causing more distinct log breaks.
    Characteristics of the upper boundary
    Upwards, the Tuxen Formation is generally in contact with the micaceous claystones and organic-rich shales of the Sola Formation (Fig 5.12 , 5.14). This boundary is marked by an upward increase in gamma-ray readings and a decrease in velocity. Where the Sola Formation is missing, the Tuxen Formation is in contact with the marlstones of the overlying Rødby Formation (Fig 5.15) . The boundary is usually defined by an upward increase in gamma-ray readings.
    Distribution
    The Tuxen Formation is widely distributed in the Norwegian and Danish sectors (Jensen et al. 1986). In the Norwegian sector it is developed in the Central Trough, along the Jæren High and in parts of the Norwegian-Danish Basin.
    In basinal areas in the Norwegian-sector it interfingers laterally with claystones and marlstones of the
    Åsgard Formation (Fig 5.4 , 5.7).
    Age
    Late Hauterivian to Late Barremian (Heilmann-Clausen 1987, Thomsen 1987).
    Depositional environment
    Deposition was dominated by pelagic marl and chalk oozes, which covered large areas of the North Sea. The bottom waters were mainly well oxygenated (Jensen et al. 1986).
    Source
    • Isaksen, D. and Tonstad, K. (eds.) 1989: A revised Cretaceous and Tertiary lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin No. 5, 59 pp.
  • Wellbores penetrating

    Wellbores penetrating
    Wellbore name
    Wellbore completion date
    Top depth [m]
    Bottom depth [m]
    27.05.1997
    4556
    4685
    31.07.1998
    3935
    3942
    22.07.2010
    5346
    5398
    16.09.2016
    5529
    5540
    08.03.1993
    4694
    4746
    02.08.2003
    3948
    4001
    14.11.1972
    3755
    3775
    29.03.1980
    3579
    3625
    03.08.1982
    3785
    3825
    05.04.1983
    3797
    3833
    12.08.1984
    3853
    3897
    23.11.1985
    3678
    3713
    06.07.1991
    3852
    3867
    08.03.1992
    3881
    3900
    14.01.1992
    3914
    3964
    07.05.1997
    4155
    4173
    10.02.1999
    3153
    3158
    07.03.2009
    4149
    4176
    28.02.2009
    5785
    5820
    05.09.2013
    3310
    3317
    13.07.2013
    3296
    3305
    08.11.2019
    3895
    3911
    19.02.1992
    3281
    3285
    14.05.2010
    3500
    3503
    04.11.1991
    4678
    4714
    15.07.1992
    4678
    4714
    10.07.1994
    4494
    4544
    24.05.2012
    4560
    4605
    24.07.2012
    4560
    4605
    22.02.2015
    4263
    4304
    05.09.2015
    4857
    4886
    18.01.1992
    4083
    4108
    25.05.1980
    3864
    3935
    13.04.1991
    3081
    3109
    31.03.1991
    4584
    4634
    13.09.1991
    4163
    4182
    17.06.1992
    4333
    4362
    07.08.1992
    3263
    3281
    09.06.1999
    4372
    4379
    27.04.1989
    3759
    4000
    22.01.1991
    2936
    2984
    04.07.2008
    4259
    4323
    15.02.2021
    3687
    3799
    03.10.1969
    2988
    3063
    11.07.1991
    4070
    4168
    23.12.1993
    3854
    3935
    07.03.2019
    3090
    3114
    14.09.1990
    4253
    4282
    26.02.1994
    2668
    2670
    28.06.1978
    2683
    2691
    20.08.1978
    3070
    3084
    07.02.1992
    3050
    3058
    30.11.1996
    3360
    3396
    27.10.2008
    3390
    3422
    29.12.2010
    3162
    3208
    21.08.1993
    2882
    2948
    13.03.2008
    3163
    3204
    25.04.1992
    3140
    3153
    04.07.1993
    3281
    3291
    31.12.2011
    5112
    5162
    16.07.2011
    4888
    4935
    29.08.1991
    3362
    3385
    06.11.1991
    3586
    3596
    17.03.1996
    5655
    5753
    28.03.2013
    2013
    2042
    01.07.1969
    2679
    2700
    17.03.1980
    2599
    2626
    06.10.2010
    2950
    3009
    18.12.2011
    2907
    2922
    27.10.2011
    2757
    2763
    24.05.2014
    2179
    2197
    04.03.2014
    2438
    2473
    16.07.2014
    1864
    1877
    04.01.2019
    2774
    2782
    06.05.1969
    1615
    1645
    03.01.2010
    2917
    2929
    16.05.2010
    2704
    2730
    29.05.2010
    2924
    2952
    18.07.2010
    4312
    4329
    27.11.2012
    2720
    2753
    24.03.1969
    1985
    2005
    30.06.1968
    1665
    1724
    21.05.2014
    3082
    3098
    15.04.2014
    3080
    3095
  • Wellbores with cores

    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]
    25.05.1980
    9