BROOM FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	BROOM FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	17
  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.	BRENT GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Broom Formation
  
  Name

  Named by Deegan and Scull (1977) who gave it "sub-unit" status.

  Well type section

  UK well 211/29-3 (Shell) from 2818 m to 2829 m, coord N 61°08'06", E 01'43'36.5" (Fig 3.10) .

  Well reference section

  Norwegian well 33/9-1 (Mobil) from 2664 m to 2668 m, coord N 61°15'07.5", E 01°50'25.8" (Fig 3.11) .

  Thickness

  11 m in the type well and 4 m in 33/9-1 . In the Brent-Statfjord area it varies from a few meters to about fifteen meters in thickness.

  Lithology

  In the type well it is a pale grey to brown, coarse-grained poorly sorted conglomeratic sandstone containing shale clasts.

  Boundaries

  The Broom Formation is distinguished from the underlying Dunlin Group and the overlying Rannoch Formation by its irregular, but generally lower, gamma ray readings.

  Distribution

  The Broom Formation is easily identified in the Brent - Statfjord area. In parts of the East Shetland Basin a thin distal equivalent of the Broom Formation is present within the shales of the Drake Formation .

  Age

  Late Toarcian to Bajocian.

  Depositional environment

  The Broom Formation is a shallow marine deposit, and is a precursor of the regression which characterizes the overlying Rannoch Formation .

  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]
  29/6-1	09.05.1982	4489	4500
  29/9-1	24.02.1984	4415	4421
  30/7-6 R	03.06.1978	4051	4057
  33/6-2	02.01.1997	3764	3777
  33/9-1	04.06.1974	2664	2668
  33/9-13 S	24.12.1987	2810	2815
  33/9-14	09.04.1988	2947	2949
  33/12-7	27.04.1989	3296	3306
  33/12-8 S	26.04.2002	3155	3167
  34/7-12	17.12.1987	2334	2341
  34/7-13	13.04.1988	2598	2600
  34/7-21	11.12.1992	2966	2972
  34/7-22	01.10.1993	2456	2460
  34/7-25 S	14.09.1996	3178	3183
  34/7-33	15.10.2008	2561	2587
  34/8-1	08.03.1986	2980	2981
  34/8-3	14.09.1988	2964	2965
  34/8-4 S	09.06.1991	2922	2924
  34/8-5	01.04.1991	3046	3049
  34/8-7	16.07.1992	4764	4767
  34/8-7 R	10.02.1993	4764	4767
  34/10-1	08.09.1978	1935	1946
  34/10-3	07.06.1979	2084	2092
  34/10-3 R	10.10.1987	2081	2089
  34/10-4	15.10.1979	1905	1916
  34/10-5	02.01.1980	2134	2148
  34/10-6	22.01.1980	2273	2290
  34/10-8	25.05.1980	2040	2054
  34/10-9	09.05.1980	1945	1957
  34/10-9 R	03.07.1980	1945	1957
  34/10-14	19.03.1982	2069	2080
  34/10-18	30.08.1983	2595	2604
  34/10-34	31.05.1991	2268	2275
  34/10-37	22.02.1995	2796	2810
  34/10-38 S	29.05.1995	3045	3052
  34/10-39 S	20.06.1995	2800	2814
  34/10-40 S	13.10.1995	5820	5842
  34/10-41 S	28.08.1997	2863	2875
  34/11-2 S	17.05.1996	4320	4328
  35/8-1	24.01.1981	3743	3744
  35/8-2	21.05.1982	3868	3885
  35/10-2	22.08.1996	4319	4353

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  29/9-1	24.02.1984	5
  33/9-13 S	24.12.1987	5
  34/7-12	17.12.1987	7
  34/8-5	01.04.1991	3
  34/10-1	08.09.1978	11
  34/10-4	15.10.1979	4
  34/10-34	31.05.1991	6