FLEKKEFJORD FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	FLEKKEFJORD FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	43
  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.	BOKNFJORD GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Flekkefjord Formation
  
  Name

  From a town on the south-west coast of Norway. This formation was formerly included in the Valhall Formation of the Cromer Knoll Group (Deegan and Scull, 1977). The same unit was defined as the Flekkefjord Member by Rawson and Riley (1982), and is here elevated to formation status.

  Well type section

  Norwegian well 9/4-2 (Texaco) from 2155 m to 2208m, coord N 57°41'11.05", E 04°02'34.85" (Fig 3.38) .

  Well reference section

  Norwegian well 8/1-1 (Phillips) from 2379 m to 2425m, coord N 57°51'43.53", E 03° 12'27.64" (Fig 3.37) .

  Thickness

  In the type well it is 53 m, and in the reference well it is 46 m. This is also the approximate thickness in most wells within the Egersund Sub-Basin.

  Lithology

  The formation consists of dark grey shales which are variably carbonaceous, pyritic and may contain thin limestone stringers.

  Boundaries

  The lower boundary of the formation is clearly defined both on gamma and sonic logs by the contact with the more silty Sauda Formation . The upper boundary usually appears as a distinct log break, with higher radioactivity and higher interval transit times in the Flekkefjord Formation. In the Egersund Sub-Basin, which is situated closer to the source area, the boundary may be difficult to identify on logs.

  Distribution

  The formation is present in the Norwegian-Danish Basin. It is time-equivalent to the upper part of the Mandal Formation in the graben areas to the west and to the Fredrikshavn Unit C in the Danish sector to the east (Michelsen, 1978).

  Age

  Ryazanian.

  Depositional envitronment

  The Flekkefjord Formation was deposited in a marine, low-energy, basinal 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]
  7/3-1	10.06.1969	2598	2643
  8/1-1	07.02.1972	2379	2425
  8/3-1	10.10.1966	1628	1658
  8/3-2	04.12.1982	2025	2075
  8/5-1	28.03.2013	2176	2205
  8/9-1	10.02.1976	2103	2123
  8/10-1	01.07.1969	2775	2793
  8/10-2	17.03.1980	2657	2667
  8/11-1	29.06.1975	2807	2835
  8/12-1	23.07.1971	2574	2607
  9/1-1 S	21.11.2011	1934	2060
  9/2-1	28.04.1987	2483	2550
  9/2-2	21.09.1987	2381	2447
  9/2-3	08.02.1990	2625	2799
  9/2-4 S	11.04.1994	2730	3075
  9/2-5	21.07.1995	2595	2706
  9/2-6 S	15.10.1996	3297	3800
  9/2-7 S	10.06.1997	3062	3182
  9/2-8 S	02.02.1998	4762	4995
  9/2-9 S	17.09.1999	2710	2823
  9/2-11	29.03.2010	2101	2180
  9/2-12	14.10.2019	2530	2602
  9/2-A-4	13.08.1996	3758	3865
  9/3-1	04.09.1986	1446	1488
  9/3-2	09.12.2005	1970	2072
  9/4-1	19.05.1968	1985	2047
  9/4-2	29.08.1970	2155	2208
  9/4-3	19.08.1972	2200	2250
  9/4-4	20.08.1977	2310	2395
  9/4-5	01.08.2006	2300	2387
  9/11-1	19.08.1971	1957	1966
  9/12-1	06.05.1969	1905	1948
  10/4-1	12.07.2015	1842	1937
  10/5-1	26.06.1976	1275	1335
  10/7-1	30.07.1992	1298	1386
  10/8-1	17.01.1971	1367	1393
  11/10-1	19.08.1969	1655	1672
  17/3-1	20.08.1995	1875	1980
  17/6-1	07.02.2011	2020	2116
  17/8-1	23.10.2021	2297	2346
  17/9-1	23.10.1973	1933	1954
  17/9-1 R	11.06.1974	1933	1954
  17/10-1	24.03.1969	2515	2544
  17/11-1	30.06.1968	2083	2101
  17/11-2	17.05.1976	2410	2422
  17/12-1 R	21.06.1972	1902	1946
  17/12-3	03.02.1980	1957	2010
  17/12-4	10.07.2009	1992	2017
  17/12-4 A	15.08.2009	2142	2175
  17/12-4 B	26.08.2009	2101	2134
  18/10-1	01.01.1980	1991	2046
  18/11-1	31.03.1974	1609	1650

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]