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

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  • General information

    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    FARSUND FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    39
    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

    Farsund Formation

    Name
    After the town of Farsund on the south-west coast of Norway.
    Well type section
    Norwegian well 2/7-3 (Phillips) from 3414 m to 3626 m, coord N 56°23'02.9", E 03°14'45.9" (Fig 3.40) .
    Well reference sections
    Norwegian well 7/12-2 (BP) from 3306 m to 3378.5 m, coord N 57°06'41.34", E 02°50'50.73" (Fig 3.32) and 2/8-3 (Amoco) from 3594m to 3761 m, coord N 56°18'31", E 03°26'54.1" (Fig 3.41) .
    Thickness
    200 m in the type well and 72.5 m ( 7/12-2 ) and 167 m ( 2/8-3 ) in the reference wells. The formation attains its maximum thickness in the axial part of the Central Graben and thins towards the flanking highs.
    Lithology
    The Farsund Formation consists predominantly of medium to dark grey shale. The shale is often well laminated and contains frequent calcareous streaks. Sandstone stringers are common in the type well 2/7-3 , particularly in the lowermost part of the sequence. In the reference well 7/12-2 , closer to the flank of the Southern Vestland Arch, a thinner Farsund Formation is present as a clear "coarsening upward cycle", becoming consistently less radioactive towards the top of the unit.
    Boundaries
    In the type well the base of the Farsund Formation occurs at the top of the sandy Eldfisk Formation and as a consequence is a pronounced gamma ray marker. Similarly, in the reference well the Farsund Formation overlies the sandy Ula Formation and is easily distinguished on logs. In several wells within the Central Graben, the Farsund Formation overlies the shaly Haugesund Formation with no intervening sand (e.g. reference well 2/8-3 . Here the base of the Farsund Formation is picked directly above the gamma ray minimum which forms the top of the Haugesund Formation .
    The top of the Farsund Formation is marked by a further gamma ray minimum. Above this occurs the distinct log motif of the
    Mandal Formation , with its high gamma ray and inter val transit time readings.
    Distribution
    The formation is present throughout the Central Graben but thin or absent over the Southern Vestland Arch and intra-basinal highs.
    Age
    Kimmeridgian to Volgian.
    Depositional environment
    The Farsund Formation shales were mainly deposited in a low-energy marine environment. The gamma ray log profile suggests that the formation represents an initial period of deepening followed by gradual shallowing. In parts of the Central Graben the occurence of thin sand stringers in the lower part of the formation probably represent minor turbidite influxes from the adjacent shelf, where time equivalent sands of the Ula Formation were being deposited.
    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.
  • Wellbores penetrating

    Wellbores penetrating
    Wellbore name
    Wellbore completion date
    Top depth [m]
    Bottom depth [m]
    24.03.1983
    4112
    4178
    27.05.1997
    4742
    5005
    31.07.1998
    4135
    4266
    22.07.2010
    5556
    5627
    16.09.2016
    5712
    5752
    08.03.1993
    4876
    5305
    12.07.1992
    4448
    4655
    30.09.1978
    4319
    4360
    02.08.2003
    4400
    4504
    03.08.1982
    4137
    4164
    05.04.1983
    3914
    4053
    12.08.1984
    4165
    4426
    23.11.1985
    3900
    3965
    06.07.1991
    4034
    4048
    08.03.1992
    4084
    4099
    14.01.1992
    4156
    4189
    14.01.1992
    4322
    4347
    07.05.1997
    4173
    4323
    10.02.1999
    3341
    3384
    13.07.2013
    3448
    3490
    13.07.2013
    3659
    3701
    08.11.2019
    4002
    4162
    08.11.2019
    4168
    4390
    03.07.1982
    3322
    3357
    11.05.1983
    3527
    3880
    07.06.1988
    3313
    3324
    19.02.1992
    3426
    3538
    14.05.2010
    3588
    4105
    20.11.1971
    2850
    2875
    09.04.1974
    3990
    4211
    04.11.1991
    4770
    4828
    15.07.1992
    4770
    4828
    10.07.1994
    4772
    5310
    24.05.2012
    4795
    5395
    24.07.2012
    4797
    5573
    22.02.2015
    4430
    4543
    05.09.2015
    4907
    5142
    22.11.1970
    3839
    3972
    24.02.1984
    4120
    4347
    18.01.1992
    4137
    4313
    26.08.1993
    4298
    4582
    25.09.1993
    4298
    4616
    22.02.2002
    3703
    4153
    21.01.2009
    4320
    4456
    25.05.1980
    4149
    4236
    25.02.1983
    3427
    3545
    02.06.1990
    3402
    3537
    11.12.1970
    3730
    4258
    11.10.1972
    3414
    3626
    02.06.1980
    3606
    4133
    02.02.1981
    4590
    4693
    14.03.1990
    4587
    4690
    13.04.1991
    3317
    5023
    31.03.1991
    4828
    4940
    13.09.1991
    4302
    4386
    07.08.1992
    3339
    3498
    06.01.1994
    4391
    4473
    06.01.1994
    4602
    4658
    09.06.1999
    4439
    4469
    03.09.1972
    3594
    3761
    27.04.1989
    4042
    4207
    22.01.1991
    3257
    4392
    04.09.1979
    3755
    4032
    14.12.1989
    3846
    4125
    04.07.2008
    4698
    5450
    18.09.2014
    3430
    3547
    15.02.2021
    4175
    4330
    03.10.1969
    3728
    4075
    06.09.1986
    3814
    4720
    12.03.1987
    3988
    4365
    14.09.1990
    4355
    5175
    26.02.1994
    2726
    2736
    31.08.2012
    2920
    2961
    20.08.1978
    3170
    3172
    30.11.1996
    3439
    4050
    27.10.2008
    3435
    3857
    29.12.2010
    3305
    3465
    08.05.2008
    2919
    2945
    21.08.1993
    2991
    3065
    13.03.2008
    3336
    3382
    25.04.1992
    3282
    3327
    04.07.1993
    3440
    3491
    12.12.1983
    3675
    3724
    03.06.2006
    3871
    3950
    10.06.1982
    4057
    4155
    20.10.1982
    4036
    4098
    25.12.1983
    4448
    4527
    08.10.1984
    4448
    4527
    09.03.1986
    4093
    4169
    10.09.1990
    4311
    4341
    10.06.2007
    4348
    4470
    31.12.2011
    5321
    5493
    16.07.2011
    5082
    5197
    31.10.2021
    4005
    4075
    23.09.1976
    3306
    3379
    06.09.1977
    3560
    3638
    12.12.1977
    3365
    3445
    07.06.1981
    3763
    3831
    24.07.1981
    3332
    3406
    26.07.1988
    3699
    3772
    23.12.1988
    3663
    3718
    14.05.1990
    3652
    3701
    29.08.1991
    3564
    3627
    06.11.1991
    3753
    3788
    17.03.1996
    5927
    6018
    18.05.2012
    4070
    4255
    06.10.2010
    3090
    3099
    18.12.2011
    3334
    3432
    27.10.2011
    2905
    2948
    24.05.2014
    2364
    2403
    04.03.2014
    2671
    2708
    16.07.2014
    2020
    2051
    04.01.2019
    2905
    2938
  • Wellbores with cores

    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]
    24.03.1983
    18
    03.08.1982
    1
    05.04.1983
    18
    12.08.1984
    189
    23.11.1985
    41
    06.07.1991
    14
    03.07.1982
    1
    10.07.1994
    12
    24.05.2012
    63
    26.08.1993
    7
    25.09.1993
    4
    25.05.1980
    15
    02.06.1990
    4
    02.06.1980
    10
    13.04.1991
    17
    31.03.1991
    10
    13.09.1991
    12
    07.08.1992
    18
    04.09.1979
    18
    03.10.1969
    15
    30.11.1996
    10
    27.10.2008
    54
    21.08.1993
    9
    13.03.2008
    4
    04.07.1993
    4
    09.03.1986
    3
    14.05.1990
    12
    29.08.1991
    11
    04.03.2014
    36