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Factpages Norwegian Offshore Directorate
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04.11.2024 - 01:25
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AGAT FM

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  • General information

    General information
    Attribute Value
    Lithostrat. unit
    The lithostratigraphic unit's official name.
    AGAT FM
    NPDID lithostrat. unit
    Norwegian Offshore Directorate's unique id for lithostratigraphic units.
    2
    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

    Agat Formation

    Name
    Named after the gas-condensate Agat Discovery in Norwegian block 35/3.
    Well type section
    Norwegian well 35/3-4 from 3589 m to 3345 m, coordinates N 61°51'54.54", E 03°52'26.99" (Fig 5.19) , 95 m of cores, mainly from the lower half of the formation.
    Well reference section
    Norwegian well 35/3-5 from 3620 m to 3219 m, coordinates N 61°47'46.71",E 03°54'44.01" (Fig 5.20) . 65 m of cores from the upper part of the formation.
    Thickness
    In the type well the gross thickness of the formation is 244 m, and in the reference well 401 m. The gross thickness varies in that range in the wells in block 35/3.
    Lithology
    In the type well the formation consists of white to light grey, fine- to medium-grained, moderately to well-sorted sandstones alternating with grey claystones. The sandstones are usually micaceous and glauconitic and sometimes contain small amounts of pyrite. The sandstones in the type well are carbonate- and silica-cemented in zones. In the reference well, the upper part of the formation consists of medium- and coarse-grained to pebbly sandstones and conglomerates alternating with dark grey claystones. The conglomerates are both matrix- and grain-supported. The claystones are often found as 0.5-5 m thick layers between the sandstones. They are dark grey, usually calcareous and contain varying amounts of siltstone. They may occasionally pass into light grey, micaceous, calcareous and glauconitic siltstones.
    Basal stratotype
    The lower boundary is defined where sandstones become the dominant lithology and is placed at the base of the first marked coarsening-upwards sandstone unit or distinct sand body. On logs it shows as an upward reduction in gamma-ray response (Fig 5.19) and (Fig 5.20) and most often an increase in velocity (Fig 5.20) .
    Characteristics of the upper boundary
    The upper boundary is placed at the top of the upper sandstone layer. This boundary is especially distinct on the gamma-ray log since the overlying sediments are dominated by calcareous shales with a low sandstone content. The overlying sediments are represented either by the Rødby Formation (well 35/3-1 and 35/3-2 ), or by the Svarte Formation (well 35/3-4 and 35/3-5 ), (Fig 5.19) . (Fig 5.20) .
    Distribution
    The formation is encountered in the area around the Måløy Fault Blocks in Norwegian blocks 35/3-36/1 (Fig 5.21) and is expected to be present along the western boundary of the Fennoscandian Shield. It is assumed to pass into shales towards the west (Fig 5.21) .
    Age
    Aptian-Albian (possibly Early Cenomanian).
    Depositional environment
    Marine environment influenced by gravity flows of sediment.
    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]
    26.10.1976
    3805
    4020
    26.10.1980
    3528
    3722
    06.06.1981
    3345
    3583
    31.03.1982
    3219
    3510
    02.04.2002
    2955
    2958
    01.10.2009
    3596
    3998
    04.04.2009
    3015
    3391
    25.08.2022
    2804
    2956
    11.11.1997
    2658
    2703
    07.02.2010
    2975
    3114
    25.04.2022
    2871
    2992
    06.04.2022
    2626
    2718
    14.06.1975
    1218
    1358
    27.10.1975
    2815
    2865
    25.03.2019
    2564
    2766
    06.01.2002
    2555
    2632
    26.09.2016
    2428
    2554
    23.11.1995
    2564
    2670
    28.12.1997
    2700
    2730
    11.02.1990
    3179
    3780
    30.11.1990
    3179
    3780
  • Wellbores with cores

    Wellbores with cores
    Wellbore name
    Wellbore completion date
    Core length [m]
    26.10.1980
    59
    06.06.1981
    97
    31.03.1982
    65
    01.10.2009
    51
    25.08.2022
    148
    11.11.1997
    39
    25.04.2022
    55
    06.04.2022
    51
    26.09.2016
    117