Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
sodir.no          Norsk
10.12.2024 - 01:27
Time of last synchronization with Norwegian Offshore Directorate's internal systems

SMITH BANK FM

Export: PDF icon PDF
  • General information

    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    SMITH BANK FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    149
    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

    Smith Bank Formation

    Name
    The name is derived from a North Sea bathymetric feature.
    Well type section
    UK well 15/26-1 (BP) (Fig 1.12-14) . from 2488 to 3087 m below KB.
    Well reference section
    Norwegian wells 10/8-1 (Petronord) (Fig 1.12-14) , and 17/10-1 (Norske Shell) (Fig 1.15-16) . The basal part of the formation was not penetrated in 17/10-1 .
    Thickness
    599 m in the type well. The formation is thickest in the western part of the Central Graben and thins towards the Norwegian sector as shown in the reference wells.
    Lithology
    The formation consists of a monotonous sequence of brick red, somewhat silty, claystones with a few thin sandstone streaks and some anhydrite bands, especially in the lower part. Minor components, particularly in the Norwegian sector, are conglomerate, dark shale, marl, limestone and dolomite. In some localities sandy units may be present at the base. Over most of the eastern sector of the North Sea these sandy units are local and unconnected but south-eastward they become more continuous.
    Boundaries
    In the type well the formation is overlain unconformably by Middle Jurassic volcanics. Elsewhere in the western and central parts of the Central North Sea overlaying rocks range from Lower Jurassic to Lower Cretaceous. This boundary almost invariably coincides with the highest occurrence of red beds in this section. To the east the top of the formation is the interdigitating contact with the Skagerrak Formation , although on a few structures where the Skagerrak Formation has been eroded away, Jurassic or younger sediments are in unconformable contact with the Smith Bank Formation. The lower boundary is normally conformable with the underlying Permian sediments and there is no major time hiatus (Brennand, 1975). However on some structures the formation may rest on basement rocks of Precambrian or Early Paleozoic age. In the type well (Fig 1.12-14) , and again in 10/8-1 (Fig 1.12-14) . the basal contact is clearly marked by gamma ray and sonic log breaks reflecting the change from the evaporitic Zechstein sequence to the clastic Triassic beds.
    Distribution
    The formation is widely distributed throughout the Central North Sea and probably occurs in Denmark north of the Ringkøbing-Fyn High. Within the Moray Firth Basin Triassic sediments have not been considered in any detail, but Brennand (1975) shows the succession to consist of a basal sandstone unit passing upwards into siltstones and sandy claystones which he considered to represent a marginal facies. It is felt that, while the name Smith Bank Formation can be applied to the complete succession, member names may be needed for the sandstone units.
    Age
    Early to possibly Late Triassic.
    Depositional environment
    The formation probably represents a range of distal continental environments where predominantly fine grained clastics were deposited.
    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.
  • Wellbores penetrating

    Wellbores penetrating
    Wellbore name
    Wellbore completion date
    Top depth [m]
    Bottom depth [m]
    24.03.1983
    4620
    4820
    27.05.1997
    5086
    5201
    08.03.1993
    5457
    5565
    02.08.2003
    4911
    4986
    26.02.1978
    3384
    3540
    29.03.1980
    4163
    4219
    03.08.1982
    4470
    4485
    06.03.1985
    4105
    4332
    07.05.1997
    4617
    4725
    27.08.1982
    2995
    3105
    11.05.1983
    3930
    4100
    07.06.1988
    3969
    4020
    03.04.1969
    2832
    2917
    24.07.1984
    3332
    3377
    14.03.2008
    5426
    5496
    30.05.1969
    3256
    3302
    25.02.1983
    3638
    3729
    02.06.1990
    3606
    3615
    18.01.2019
    3545
    3599
    07.08.1992
    3796
    3839
    06.01.1994
    4789
    4800
    14.12.1989
    4600
    4670
    25.04.1993
    3905
    4062
    12.03.1987
    4672
    4674
    14.09.1990
    5537
    5757
    26.02.1994
    3013
    3077
    20.08.1978
    3604
    3825
    28.04.2013
    3680
    3717
    14.09.2015
    3467
    3511
    27.05.2019
    3706
    3741
    13.03.2008
    3421
    3457
    03.06.2013
    2733
    3000
    20.02.1990
    3288
    3500
    25.04.1992
    3347
    3388
    04.07.1993
    3507
    3567
    29.08.1973
    2883
    2997
    12.12.1983
    3767
    4237
    20.02.1985
    3826
    4400
    10.06.1982
    4241
    4478
    20.10.1982
    4145
    4500
    12.12.1983
    3725
    4750
    09.03.1986
    4183
    4271
    10.09.1990
    4395
    4566
    10.06.2007
    4618
    4679
    07.06.1981
    4145
    4393
    07.02.1972
    2727
    2873
    28.03.2013
    2371
    2405
    01.07.1969
    2866
    3081
    17.03.1980
    2795
    2880
    06.10.2010
    3221
    3394
    04.03.2014
    2791
    2810
    04.01.2019
    2954
    3146
    29.06.1975
    3182
    3810
    19.05.1968
    2590
    2939
    01.08.2006
    4638
    5224
    06.05.1969
    2417
    2698
    26.06.1976
    1561
    1597
    17.01.1971
    2749
    2825
    28.02.1976
    644
    1930
    08.06.1993
    3476
    3540
    25.05.1981
    3676
    3730
    14.07.1981
    2776
    2969
    07.11.1981
    3241
    3289
    23.12.1981
    2830
    2950
    27.05.1982
    2791
    3256
    27.06.1982
    3543
    3563
    24.08.1982
    2705
    3011
    30.03.1983
    2847
    3120
    02.03.1984
    3593
    3622
    09.11.1997
    4097
    4131
    02.02.1998
    4214
    4250
    20.03.1994
    3503
    3626
    27.02.1976
    2868
    2888
    07.01.1991
    3477
    3570
    13.05.2021
    2771
    2784
    07.08.1976
    2620
    2713
    27.09.1982
    2840
    3082
    16.02.2014
    2167
    2183
    21.11.2013
    2095
    2114
    01.04.2014
    1979
    1986
    16.03.2014
    1978
    1993
    18.11.1984
    2337
    2394
    03.05.2013
    2198
    2233
    07.03.2016
    2625
    2668
    30.03.1982
    2692
    3010
    27.07.1982
    2385
    2795
    03.08.1984
    2775
    2900
    03.01.2011
    2553
    2665
    29.10.1976
    2116
    2301
    12.07.1968
    3074
    3199
    01.12.1996
    2626
    2850
    31.10.1967
    2236
    2255
    20.08.1995
    2440
    2811
    26.08.1968
    2532
    2665
    23.10.2021
    2544
    2658
    24.03.1969
    3398
    3591
    30.06.1968
    2315
    2517
    17.05.1976
    2608
    2644
    21.06.1972
    3965
    4133
    20.10.1975
    4261
    4360
    04.08.1976
    3847
    4000
    15.11.1977
    3705
    3750
    25.01.1990
    3887
    3908
    09.12.1972
    3513
    4060
    26.03.1981
    4207
    4355
    03.02.1986
    2651
    2851
    22.09.1994
    3338
    3395
    03.08.1997
    3338
    3395
    19.06.1999
    2028
    2156
    09.06.1999
    2040
    2096
    22.04.1995
    2415
    2525
    02.04.2010
    2368
    2432
    18.01.2015
    2540
    2597
  • Wellbores with cores

    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]
    08.03.1993
    10
    12.03.1987
    0
    14.09.1990
    2
    13.03.2008
    0
    20.02.1990
    17
    25.04.1992
    21
    04.07.1993
    9
    12.12.1983
    1
    20.02.1985
    33
    20.10.1982
    13
    12.12.1983
    19
    09.03.1986
    26
    10.09.1990
    8
    27.05.1982
    9
    16.03.2014
    15