EGERSUND FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	EGERSUND FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	30
  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

  Egersund Formation
  
  Name

  Named by Deegan and Scull (1977) who gave the unit member status.

  Well type section

  Norwegian well 9/4-1 (Amoseas) from 2251 m to 2288 m, coord N 57°35'02", E 04°01'13" (Fig 3.34) .

  Well reference section

  17/12-1 R (Phillips) from 2215 m to 2290 m, coord N 58° 11' 15.4'', E 03°56'22.2'' (Fig 3.35) .

  Thickness

  37 m in the type well and 75 m in the reference well.

  Lithology

  In the type well the formation consists of dark grey micromicaceous shales and siltstones with brownish, locally oolitic, microcrystalline carbonate beds and occasionally sandstone streaks. The latter become more important east and north-east of the type well.

  Boundaries

  The lower boundary is also the junction of the Boknfjord Group with the Vestland Group and is described above. At the base of the formation a more radioactive part is recognizable in several wells. The upper boundary is marked by the appearance of the dark grey to black organic-rich shales of the overlying Tau Formation . The shales of the Tau Formation have a high radioactivity and a low velocity, and therefore the upper boundary is marked by strong log breaks.

  Distribution

  The formation is distributed throughout Fiskebank and Egersund Sub-Basins.

  Age

  Callovian to Kimmeridgian.

  Depositional environment

  The Egersund Formation was deposited in an open marine, generally 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]
  8/3-1	10.10.1966	1890	2040
  8/3-2	04.12.1982	2290	2375
  8/5-1	28.03.2013	2314	2339
  9/1-1 S	21.11.2011	2332	2392
  9/2-1	28.04.1987	3097	3162
  9/2-2	21.09.1987	3062	3123
  9/2-3	08.02.1990	3188	3252
  9/2-4 S	11.04.1994	3993	4094
  9/2-5	21.07.1995	3078	3146
  9/2-6 S	15.10.1996	4714	4783
  9/2-7 S	10.06.1997	3784	3854
  9/2-8 S	02.02.1998	5769	5823
  9/2-8 S	02.02.1998	7420	7584
  9/2-9 S	17.09.1999	3669	3844
  9/2-11	29.03.2010	2574	2629
  9/2-12	14.10.2019	2932	2991
  9/2-A-4	13.08.1996	4560	4631
  9/3-1	04.09.1986	1749	1788
  9/3-2	09.12.2005	2607	2660
  9/4-1	19.05.1968	2251	2288
  9/4-2	29.08.1970	2435	2490
  9/4-3	19.08.1972	2437	2490
  9/4-4	20.08.1977	2668	2718
  9/4-5	01.08.2006	2654	2703
  9/8-1	29.06.1968	1825	1922
  9/11-1	19.08.1971	2005	2040
  10/4-1	12.07.2015	2245	2274
  10/8-1	17.01.1971	1464	1494
  11/5-1	12.09.2007	1141	1276
  17/3-1	20.08.1995	2339	2388
  17/6-1	07.02.2011	2542	2630
  17/8-1	23.10.2021	2417	2435
  17/9-1	23.10.1973	2205	2220
  17/9-1 R	11.06.1974	2205	2220
  17/10-1	24.03.1969	2675	2682
  17/11-1	30.06.1968	2195	2211
  17/11-2	17.05.1976	2513	2521
  17/12-1 R	21.06.1972	2215	2290
  17/12-3	03.02.1980	2288	2370
  17/12-4	10.07.2009	2198	2277
  17/12-4 A	15.08.2009	2438	2606
  17/12-4 B	26.08.2009	2377	2536
  18/10-1	01.01.1980	2319	2405
  18/11-1	31.03.1974	1800	1878

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  9/2-1	28.04.1987	13
  17/12-4	10.07.2009	9