KROSSFJORD FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	KROSSFJORD FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	87
  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.	VIKING GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Krossfjord Formation
  
  Name

  After a fjord on the west coast of Norway, adjacent to the type area in Quadrant 31.

  Well type section

  Norwegian well 31/2-1 (Shell) from 1741.5 m to 1880 m, coord N 60°46'19.16", E 03°33'15.87", (Fig 3.21) .

  Well reference section

  None at present.

  Lithology

  The formation consists of sandstones, light grey-brown in colour, medium to coarse grained, well sorted, and loose to very friable. Occasionally calcite cemented streaks occur. The lower portion of the Krossfjord Formation is slightly argillaceous and carbonaceous with minor shale intercalations.

  Boundaries

  In the type well the formation overlies the lower part of the Heather Formation . It has a "blocky" log character and is the first continuous thick sandstone unit above the Brent Group . The base of the formation is shown by the underlying reduction in gamma-ray intensity and FDC-CNL separation. The top is characterized by the change to the serrate gamma ray log motif of the overlying Fensfjord Formation and an overall upward increase in gamma ray intensity.

  Distribution

  The formation has only been clearly recognized in the Troll Field area.

  Age

  Bathonian.

  Depositonal environment

  The formation was deposited in a coastal shallow marine environment.

  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]
  30/9-23	21.08.2009	2678	2717
  31/2-1	09.11.1979	1742	1880
  31/2-1 R	09.11.1981	1743	1881
  31/2-2	23.04.1980	1848	1857
  31/2-2 R	06.10.1980	1848	1961
  31/2-3	20.07.1980	1677	1755
  31/2-4 R	06.04.1981	1625	1710
  31/2-4 R2	12.11.1982	1625	1710
  31/2-5	21.12.1980	1789	1860
  31/2-5 R	20.07.1981	1782	1853
  31/2-5 R2	22.04.1984	1782	1853
  31/2-8	18.08.1982	2254	2266
  31/2-18 A	17.10.1992	1916	2005
  31/2-20 S	08.12.2002	3148	3252
  31/3-1	13.10.1983	1668	1779
  31/3-2	30.04.1984	1851	1929
  31/3-3	18.11.1984	2077	2134
  31/3-4	05.01.2014	1996	2010
  31/4-10	13.12.1995	2270	2278
  31/4-11	12.09.2000	2522	2538
  31/5-2	11.11.1983	1826	1908
  31/5-2 R	30.08.1984	1826	1908
  31/5-3	09.06.1984	1848	1905
  31/5-5	11.02.1993	1855	1930
  31/5-5 R	27.07.2002	1862	1937
  31/5-6	25.07.2000	2056	2112
  31/5-7	06.03.2020	2278	2382
  31/6-1	28.10.1983	1720	1776
  31/6-2	11.12.1983	1875	1910
  31/6-2 R	08.09.1984	1875	1910
  31/6-3	26.12.1983	1756	1932
  31/6-5	21.05.1984	1937	1972
  31/6-6	29.07.1984	1947	1976
  31/6-8	25.05.1985	1927	1965
  31/6-8 R	22.09.1985	1927	1965
  31/8-1	24.07.2011	2498	2629
  31/11-1 S	28.06.2021	2678	2721
  32/2-1	01.07.2008	1115	1187
  32/4-1	04.12.1996	1598	1645
  32/4-3 S	26.10.2019	1551	1645
  35/9-1	07.05.1989	2099	2140
  35/9-1 R	27.07.1989	2099	2140
  35/9-2	03.04.1991	2481	2512
  35/9-5	07.02.2010	3376	3531
  35/9-9	18.11.2013	2848	2943
  35/11-1	06.08.1984	2233	2469
  35/12-2	15.07.2009	2232	2237
  35/12-3 S	16.02.2011	2594	2716
  35/12-5 S	19.06.2015	3230	3289
  36/1-4 S	30.01.2022	3097	3130
  36/7-1	07.05.1996	2510	2560

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  31/2-4 R	06.04.1981	37
  31/5-5	11.02.1993	33
  35/9-1	07.05.1989	35
  35/9-2	03.04.1991	29