HAVERT FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	HAVERT FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	58
  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.	SASSENDALEN GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Havert Formation
  
  Name

  From the seal species Halichoerus grypus: The unit corresponds to unit T1-1 or the Svolvær Formation of earlier informal usage.

  Well type section

  Well 7120/12-2 (Norsk Hydro), coordinates 70°7'30.03"N, 20°48'19.00"E, from 3657 m to 3552 m (Fig 4.42) .

  Well reference section

  Well 7120/9-2 (Norsk Hydro), coordinates 71°29'40.81"N, 20°42'05.38"E, from 4956 m to 4806 m (Fig 4.43) .

  Thickness

  105 m in the type well and 150 m in the reference well.

  Lithology

  In the type well the formation consists of medium to dark grey shales with minor inter-bedded pale grey siltstones and sandstones comprising two generally coarsening upwards sequences. The reference section further north in the Hammerfest Basin shows a more monotonous silty shale sequence with only a very weak upwards coarsening trend.

  Basal Stratotype

  The base is defined by increasing gamma ray and decreasing density responses above underlying mixed clastic and carbonate sequences. In the reference well the base is also easily recognised as basal silty shales directly overlie a 6 m thick limestone bed.

  Lateral extent and variation

  Present information suggests a fining trend from the southern margins of the Hammerfest Basin northwards. Thicknesses are moderate and show no marked trends.

  Age

  Palynomorphs suggest a Griesbachian to Dienerian age.

  Depositional environment

  The formation was deposited in marginal marine to open marine settings with coastal environments to the south and southeast.

  Correlation

  Palynofloras and sequence development show similarities to the Vardebukta Formation of western Spitsbergen.

  Source

  • Dalland, A., Worsley, D. and Ofstad, K. (eds.) 1988: A lithostratigraphic scheme for the Mesozoic and Cenozoic succession offshore mid- and northern Norway. NPD-Bulletin No. 4, 65 pp.

• Wellbores penetrating

  Wellbores penetrating

  Wellbore name	Wellbore completion date	Top depth [m]	Bottom depth [m]
  7120/1-1	15.11.1985	2373	2403
  7120/1-1 R	26.12.1985	2373	2403
  7120/1-1 R2	21.07.1986	2373	2403
  7120/9-2	20.10.1984	4806	4956
  7120/12-2	11.09.1981	3552	3657
  7120/12-4	16.04.1984	992	1366
  7121/1-1 R	23.08.1986	2786	2993
  7122/7-3	08.01.2006	2212	2595
  7122/7-4 S	25.11.2006	2217	2550
  7124/3-1	20.10.1987	2671	3475
  7124/4-1 S	12.10.2011	2606	2814
  7128/4-1	26.02.1994	1008	1569
  7128/6-1	08.11.1991	1002	1623
  7130/4-1	08.01.2016	1302	1895
  7132/2-2	07.04.2019	1895	3405
  7220/11-4	17.07.2017	1886	1903
  7220/11-4 A	28.08.2017	2218	2227
  7221/4-1	01.12.2020	1459	1564
  7222/1-1	02.08.2016	2075	2195
  7222/6-1 S	10.03.2008	2674	2895
  7224/2-1	04.03.2016	2735	2944
  7224/7-1	19.06.1988	2663	3067
  7225/3-1	25.09.2011	2555	3666
  7226/2-1	19.07.2008	2930	2992
  7226/11-1	11.04.1988	2913	3877
  7228/2-1 S	20.12.1989	3984	4300
  7228/9-1 S	07.05.1990	2638	3884
  7229/11-1	15.12.1993	2804	3879
  7234/6-1	19.07.2021	1729	3711
  7322/6-1 S	28.05.2021	2447	2519
  7324/10-1	19.08.1989	2512	2919
  7325/1-1	21.07.2014	2758	2865
  7335/3-1	15.06.2019	3060	4300

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  7122/7-3	08.01.2006	2
  7225/3-1	25.09.2011	27
  7226/11-1	11.04.1988	35
  7228/2-1 S	20.12.1989	9
  7228/9-1 S	07.05.1990	17
  7324/10-1	19.08.1989	19