ROGN FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	ROGN FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	134
  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.	VIKING GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Rogn Formation
  
  Name

  The Norwegian word for spawn or hard roe. The formation corresponds to the informally used Frøya Formation.

  Well type section

  6407/9-1 (Shell), coordinates 64°21'55.39"N, 07°47'21.76"E, from 1670 m to 1621 m (Fig 4.22) . Three cores, recovery 35.5 m, including the base.

  Thickness

  49 m in the type well.

  Lithology

  The formation shows a coarsening upward sequence from siltstones and shales to sandstones which constitute the bulk of the unit.

  Basal Stratotype

  The Rogn Formation is developed within the Spekk Formation in the type well. The lower boundary is defined at the base of a gradual decrease in the gamma ray log and at a sharp decrease in interval transit time shown by the sonic log (Fig 4.21) .

  Lateral extent and variation

  The formation is developed in the Draugen Field area, where it thins laterally away from the type well.

  Age

  Oxfordian to Kimmeridgian.

  Depositional environment

  The formation's sandstones are interpreted as shallow marine bar deposits.

  Correlation

  There are no known comparable units in surrounding areas.

  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]
  6306/3-1 S	11.12.2021	2318	2345
  6306/3-2	12.07.2022	1650	1729
  6306/5-2	11.10.2015	2940	2952
  6306/6-1	05.07.1994	1159	1252
  6306/9-1	18.01.2022	817	895
  6406/12-1 S	28.02.1991	3600	3625
  6406/12-2	17.10.1995	3790	3873
  6406/12-2	17.10.1995	3907	3912
  6406/12-3 A	22.07.2014	4053	4114
  6406/12-3 B	11.06.2014	3728	3748
  6406/12-4 A	17.09.2015	3522	3529
  6406/12-4 S	17.08.2015	3726	3753
  6407/5-2 S	04.09.2011	3109	3116
  6407/6-7 S	27.05.2009	2747	2766
  6407/7-1 S	07.04.1986	2706	2721
  6407/8-4 S	21.05.2008	2184	2187
  6407/9-1	07.09.1984	1621	1670
  6407/9-2	02.02.1985	1650	1702
  6407/9-3	28.07.1985	1630	1668
  6407/9-4	10.09.1985	1658	1660
  6407/9-5	13.11.1985	1654	1705
  6407/9-6	13.03.1986	1643	1660
  6407/9-6 R	30.05.1993	1643	1660
  6407/9-10	23.06.2003	1635	1665
  6407/9-12	08.11.2019	1663	1701
  6407/10-1	19.06.1987	2579	2702
  6407/10-2	23.06.1990	2830	2904
  6407/10-5	18.09.2015	2588	2647
  6407/11-1	07.12.2018	1771	1774
  6407/12-1	15.07.1999	1659	1721

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  6306/3-2	12.07.2022	73
  6306/6-1	05.07.1994	19
  6406/12-1 S	28.02.1991	22
  6406/12-2	17.10.1995	27
  6406/12-3 A	22.07.2014	29
  6406/12-3 B	11.06.2014	20
  6407/6-7 S	27.05.2009	9
  6407/7-1 S	07.04.1986	8
  6407/9-1	07.09.1984	36
  6407/9-2	02.02.1985	34
  6407/9-3	28.07.1985	33
  6407/9-5	13.11.1985	42
  6407/9-6	13.03.1986	12
  6407/9-12	08.11.2019	18
  6407/10-1	19.06.1987	28
  6407/11-1	07.12.2018	3