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EIRIKSSON FM

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  • General information

    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    EIRIKSSON FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    32
    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

    Eiriksson Formation

    Name
    Named after Leiv Eiriksson, the discoverer of North America in the year 1000, according to the Norse Sagas. He was the son of Eirik Raude.
    Well type section
    Norwegian well 33/12-2 (Mobil) (Fig 1.17-18) . from 2719 m to 2790 m below KB.
    Well reference section
    UK well 211/24-1 (Conoco/Gulf/NCB) (Fig .17-18) .
    Thickness
    71 m in the type well. In the reference well the formation is 157 m thick. The thickness is relatively constant over the area of the Statfjord Field but the formation thickens towards the south and west (Fig .17-18) . where sandstone characteristic of this formation occur at lower levels in the section.
    Lithology
    In the type well the formation is characterised by massive sandstone beds, generally correlatable between the wells, interbedded with hard grey shales. The sandstones are white to light grey, medium to very coarse grained with thin horizons of granules, pebbles, and lignite fragments, often concentrated in channels and along cross-bedding foresets. They contain slightly less kaolinite matrix, mica and rock fragments than the sandstones of the Raude Formation . The shales are slightly and commonly micaceous and carbonaceous. In the area of the Statfjord Field the sandstone beds average about 5 m in thickness and the shale beds average about 2.5 m. The sediments of this formation appear more mature than those of the Raude Formation , and marine fossils and glauconite are present near the top of the formation in the type well.
    Boundaries
    The originally Eiriksson Member of the Statfjord Formation was elevated to formation level by Lervik, 2006. There is usually a sharp upward transition from the Raude Formation reflecting a change to a more humid climate as well as a tectonic uplift of the hinterland. Sandstones are more abundant and thicker. The modified climate resulted in a change in the colour of the siltstones and mudstones from red to green and grey, and carbonate nodules and soils that formed in the previous evaporitic environment were replaced by coal- and carbonaceous-rich beds. The lower boundary is formed by the base of the lowest massive sandstone which can be well correlated. The upper boundary is marked by the base of the distinctive sandstones of the Nansen Formation which are frequently calcareous. The Eiriksson Formation has a characteristic blocky gamma ray and sonic log response but the boundaries may not always be marked by prominent log breaks.
    Distribution
    The formation is present over much of the northern North Sea, but not in the southern part of the East Shetland Basin.
    Age
    In the type well it is Hettangian, possibly extending into the early Sinemurian. However, to the west and south the base of the formation appears to be progressively older.
    Depositional environment
    Nystuen and Fält (1995) reported vertically stacked channel-sandstones forming multi-storey sandstone units up to 30-40 m thick. Cross-bedded sandstones with basal channel-lag conglomerates of coarse- to very coarse-grained sandstones with pebbles of quartz and gneiss (Nystuen and Fält, 1995) associated with coal facies are interpreted as having a fluvial origin (Røe and Steel, 1985). Røe and Steel (1985) discussed the sheet-like extent of the sand bodies, interpreting them as having formed in a relatively high-gradient, braided-alluvial setting. The Eiriksson Formation is interpreted as the more proximal braided-stream deposit of a fan-delta system associated with coastal to shallow marine elements. Deegan and Scull (1977) reported marine fossils and glauconite near the top of the fromation in well 33/12-2 , suggesting a marginal marine environment varying from coastal backswamp and river mouth situations to coastal barriers.
    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.
    • Goldsmith, P. J., Hudson, G. and Van Veen, P. Triassic. 105 – 127 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.
    • Lervik, K.-S. 2006: Triassic lithostratigraphy of the Northern North Sea Basin. Norwegian Journal of Geology, Vol. 86, pp. 93-116.
  • Wellbores penetrating

    Wellbores penetrating
    Wellbore name
    Wellbore completion date
    Top depth [m]
    Bottom depth [m]
    31.07.2021
    2261
    2316
    28.02.2023
    3098
    3177
    12.12.2012
    1966
    1999
    07.02.2013
    2356
    2385
    21.11.2013
    2027
    2038
    07.06.2013
    1948
    1965
    22.04.2019
    2972
    3170
    09.01.2020
    2995
    3067
    19.03.2020
    2286
    2483
    30.12.2019
    2263
    2434
    18.01.2015
    2249
    2324
    10.02.2023
    3978
    4052
    05.10.1992
    4294
    4325
    16.02.1981
    3308
    3394
    22.09.1979
    2786
    2959
    16.12.1982
    3226
    3334
    12.05.1990
    3224
    3332
    08.02.1984
    2799
    2855
    05.09.1984
    3272
    3548
    21.01.1985
    2967
    3224
    21.06.1986
    3275
    3301
    25.05.1994
    3274
    3300
    01.07.1990
    3179
    3210
    29.03.2012
    2590
    2754
    03.03.2015
    5735
    5765
    01.03.1996
    4729
    5149
    30.03.1985
    4209
    4303
    06.11.1989
    2775
    2809
    08.08.1994
    3476
    3550
    26.02.2016
    3717
    4083
    28.06.2021
    3043
    3120
    26.12.2014
    4388
    4411
    24.07.2012
    4285
    4332
    23.08.1974
    2719
    2790
    26.04.2002
    3731
    3750
    08.05.1981
    3865
    3957
    19.05.2015
    4658
    4723
    06.03.2022
    2855
    2918
    13.03.2010
    3834
    3900
    05.11.2012
    4095
    4252
    24.09.2014
    4407
    4462
    30.05.1985
    2527
    2586
    16.12.1985
    2560
    2629
    29.10.1986
    2562
    2620
    08.12.1978
    3379
    3497
    07.06.1979
    2561
    2677
    10.10.1987
    2558
    2674
    15.10.1979
    2435
    2458
    02.01.1980
    2649
    2732
    05.03.1981
    1935
    2000
    22.10.1984
    3914
    3930
    13.07.1987
    3386
    3488
    10.08.1987
    3386
    3488
    11.04.2001
    3946
    4165
    08.07.2001
    3776
    3982
    18.04.2014
    4512
    4635
  • Wellbores with cores

    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]
    12.12.2012
    20
    07.02.2013
    28
    21.11.2013
    10
    07.06.2013
    17
    09.01.2020
    72
    19.03.2020
    16
    30.12.2019
    15
    05.09.1984
    119
    21.01.1985
    8
    30.03.1985
    8
    08.08.1994
    10
    23.08.1974
    3
    30.05.1985
    52
    16.12.1985
    54
    29.10.1986
    42
    08.12.1978
    11
    13.07.1987
    61
    18.04.2014
    9