JOHANSEN FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	JOHANSEN FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	73
  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.	DUNLIN GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Johansen Formation
  
  Name

  Named after Hjalmar Johansen, member of the Amundsen South Pole expedition.

  Well type section

  Norwegian well 31/2-1 (Shell) from 2176 m to 2272.5 m, coord N 60°46'19.16'', E 03°33'15.87" (Fig 3.13) .

  Well reference section

  None at present.

  Thickness

  95.5 m in the type well.

  Lithology

  In the type well the formation consists of a sequence of sandstones with thin calcite cemented streaks throughout. The lower part is medium to fine-grained, micaceous, well sorted sandstone which grades downwards into light grey silty micaceous claystone. The main section of the formation is composed of medium grained, friable sandstones, with well sorted quartz grains which are angular to subrounded. The uppermost part is composed of medium to fine grained, micaceous sandstones, which are moderately sorted, silty and argillaceous.

  Boundaries

  In the type well area the Johansen Formation splits the Amundsen Formation . It is distinguished by a low response, crescentic gamma ray profile.

  Distribution

  The formation is restricted to an area extending from the eastern part of the Horda Platform northwards to the Måløy Fault Blocks.

  Age

  Sinemurian to Pliensbachian.

  Depositional environment

  The formation was probably deposited on a high energy, shallow marine shelf.

  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]
  31/1-1	15.02.2008	2787	2882
  31/2-1	09.11.1979	2176	2273
  31/2-1 R	09.11.1981	2177	2274
  31/2-2 R	06.10.1980	2233	2344
  31/2-3	20.07.1980	2097	2176
  31/2-4 R	06.04.1981	2126	2241
  31/2-4 R2	12.11.1982	2126	2241
  31/2-5	21.12.1980	2308	2387
  31/2-5 R	20.07.1981	2301	2380
  31/2-5 R2	22.04.1984	2301	2380
  31/2-8	18.08.1982	2967	3035
  31/3-1	13.10.1983	2001	2088
  31/3-3	18.11.1984	2306	2432
  31/4-3	11.05.1980	2543	2702
  31/5-2	11.11.1983	2225	2323
  31/5-2 R	30.08.1984	2225	2323
  31/5-7	06.03.2020	2702	2818
  31/6-1	28.10.1983	1981	2083
  31/6-2 R	08.09.1984	2055	2138
  31/6-3	26.12.1983	2042	2125
  31/6-6	29.07.1984	2122	2193
  31/7-1	22.06.2016	2756	2780
  31/11-1 S	28.06.2021	2929	2998
  32/4-1	04.12.1996	1785	1791
  32/4-3 S	26.10.2019	1746	1797
  35/1-1	18.07.2002	4124	4180
  35/9-11 A	21.05.2014	3753	3782
  35/9-11 S	15.04.2014	3752	3782
  35/10-1	16.01.1992	3665	3806
  35/11-1	06.08.1984	2764	2995
  35/11-2	04.12.1987	3730	3775
  35/11-3 S	09.09.1989	3794	3895
  35/11-4	29.12.1990	3023	3082
  35/11-4 R	27.01.1992	3033	3092
  35/11-5	03.11.1991	3570	3628
  35/11-6	20.04.1992	3887	3924
  35/11-7	29.09.1992	2791	2840
  35/11-18 A	16.12.2015	3943	3953
  35/11-22 S	02.02.2019	3657	3676

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  31/2-3	20.07.1980	18
  31/4-3	11.05.1980	17
  31/5-7	06.03.2020	69