SOGNEFJORD FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	SOGNEFJORD FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	151
  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

  Sognefjord Formation
  
  Name

  After a fjord on the west coast of Norway, adjacent to the type area in Quadrant 31.

  Well type section

  Norwegian well 31/2-1 (Shell) from 1440 m to 1531.5 m, coord N 60°46' 19.16", E 03°33'15.87", (Fig 3.21) .

  Well reference section

  None at present.

  Lithology

  The formation consists of sandstones and sands, grey-brown in colour, medium to coarse grained, well sorted and friable to unconsolidated. Locally the formation is weakly micaceous with minor argillaceous and carbonaceous beds. Bioclastic material and occasional cemented bands occur locally.

  Boundaries

  The Sognefjord Formation has a gradational lower boundary, due to the interdigitation of sandstones with the siltstones which form the upper part of the Heather Formation . The base is chosen immediately below the first continuous sandstone, often shown by reduction in gamma ray intensity. The formation has a homogenous "blocky" log motif in the lower half. The upper half comprises several cycles displaying "funnel-shaped" gamma ray log motifs coincident with coarsening upward sequences. The top of the formation is marked by the distinct lithological break into claystones or shales, which in the type well are the overlying Draupne Formation .

  Distribution

  The formation has only been clearly recognized in the Troll Field area, where it is the major reservoir interval.

  Age

  Oxfordian to Kimmeridgian/Volgian.

  Depositional environment

  The formation was deposited in a coastal-shallow marine 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]
  30/9-23	21.08.2009	2283	2338
  31/1-1	15.02.2008	2055	2068
  31/2-1	09.11.1979	1440	1532
  31/2-1 R	09.11.1981	1441	1533
  31/2-2	23.04.1980	1545	1665
  31/2-2 R	06.10.1980	1545	1665
  31/2-3	20.07.1980	1384	1508
  31/2-4 R	06.04.1981	1365	1460
  31/2-4 R2	12.11.1982	1365	1460
  31/2-5	21.12.1980	1536	1617
  31/2-5 R	20.07.1981	1529	1610
  31/2-5 R2	22.04.1984	1529	1610
  31/2-6	17.10.1981	1492	1673
  31/2-7	14.06.1982	1546	1601
  31/2-8	18.08.1982	1837	1999
  31/2-9	01.10.1982	1549	1600
  31/2-10	31.10.1982	1600	1733
  31/2-11	25.05.1983	1558	1611
  31/2-12	09.09.1983	1365	1487
  31/2-13 S	15.03.1984	1732	1855
  31/2-14	21.06.1984	1533	1595
  31/2-15	15.11.1984	1515	1559
  31/2-16 S	27.12.1989	1659	2390
  31/2-16 SR	08.07.1991	1660	2391
  31/2-17 A	31.01.1992	1689	1756
  31/2-17 B	14.02.1992	1691	1838
  31/2-17 BR	24.02.1993	1696	1843
  31/2-17 S	20.01.1992	1872	1957
  31/2-18	07.10.1992	1529	1643
  31/2-18 A	17.10.1992	1530	1655
  31/2-20 S	08.12.2002	2673	2887
  31/2-21 S	04.06.2014	2192	2562
  31/2-22 A	16.03.2021	2051	2117
  31/2-22 A	16.03.2021	2157	2207
  31/2-22 S	03.03.2021	1907	1980
  31/2-22 S	03.03.2021	1995	2061
  31/3-1	13.10.1983	1352	1497
  31/3-2	30.04.1984	1567	1706
  31/3-3	18.11.1984	1753	1905
  31/3-4	05.01.2014	1658	1669
  31/4-3	11.05.1980	2018	2082
  31/4-4	17.02.1981	2365	2402
  31/4-5	29.07.1981	2070	2078
  31/4-10	13.12.1995	2025	2098
  31/4-11	12.09.2000	2201	2233
  31/4-12	14.03.2005	2089	2125
  31/5-2	11.11.1983	1521	1642
  31/5-2 R	30.08.1984	1521	1642
  31/5-3	09.06.1984	1555	1666
  31/5-4 A	13.12.1990	1621	2603
  31/5-4 AR	18.07.1991	1621	2603
  31/5-4 AR2	05.09.2003	1628	2610
  31/5-4 S	10.10.1990	1619	1830
  31/5-5	11.02.1993	1572	1660
  31/5-5 R	27.07.2002	1579	1667
  31/5-6	25.07.2000	1798	1862
  31/5-7	06.03.2020	1957	2104
  31/6-1	28.10.1983	1352	1488
  31/6-2	11.12.1983	1460	1625
  31/6-2 R	08.09.1984	1460	1625
  31/6-3	26.12.1983	1511	1669
  31/6-5	21.05.1984	1518	1677
  31/6-6	29.07.1984	1561	1706
  31/6-8	25.05.1985	1507	1661
  31/6-8 R	22.09.1985	1507	1661
  31/7-1	22.06.2016	2154	2230
  31/7-1 A	14.07.2016	2371	2478
  31/7-2 A	27.07.2017	2579	2692
  31/7-2 S	08.07.2017	2190	2292
  31/7-3 A	18.01.2019	2726	2810
  31/7-3 S	16.12.2018	2573	2633
  31/8-1	24.07.2011	2123	2367
  31/11-1 S	28.06.2021	2317	2412
  32/2-1	01.07.2008	902	1012
  32/4-1	04.12.1996	1238	1306
  32/4-3 S	26.10.2019	1248	1415
  35/8-4	10.08.1999	3639	3719
  35/9-2	03.04.1991	2109	2132
  35/9-12 S	26.12.2014	2950	2957
  35/11-3 S	09.09.1989	3081	3096
  35/11-4	29.12.1990	1984	2116
  35/11-4 R	27.01.1992	1994	2126
  35/11-5	03.11.1991	2875	2950
  35/11-6	20.04.1992	3157	3196
  35/11-7	29.09.1992	1796	1964
  35/11-8 S	11.05.1996	2807	2825
  35/11-9	01.05.1997	2556	2580
  35/11-10	23.06.1997	1971	2117
  35/11-10 A	14.07.1997	2293	2457
  35/11-16 S	18.03.2014	3416	3554
  35/11-17	01.05.2014	2145	2184
  35/11-20 A	07.08.2016	3869	3901
  35/11-20 B	15.09.2016	4131	4176
  35/11-20 S	19.06.2016	3362	3432
  35/11-21 A	17.10.2018	2281	2320
  35/11-25 A	04.06.2021	3007	3051
  35/11-25 A	04.06.2021	3091	3143
  35/11-25 S	14.05.2021	2896	2985
  35/11-25 S	14.05.2021	3078	3127
  35/12-1	24.04.1992	2557	2667
  35/12-2	15.07.2009	1968	2030
  35/12-3 S	16.02.2011	2046	2164
  35/12-5 S	19.06.2015	3007	3019
  36/7-1	07.05.1996	2171	2207
  36/7-2	22.09.1997	917	936
  6204/11-2	28.12.1997	2892	2920

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  31/2-1	09.11.1979	55
  31/2-2	23.04.1980	77
  31/2-3	20.07.1980	76
  31/2-4 R	06.04.1981	75
  31/2-5	21.12.1980	70
  31/2-6	17.10.1981	124
  31/2-7	14.06.1982	39
  31/2-8	18.08.1982	46
  31/2-9	01.10.1982	44
  31/2-10	31.10.1982	124
  31/2-11	25.05.1983	38
  31/2-12	09.09.1983	86
  31/2-13 S	15.03.1984	79
  31/2-14	21.06.1984	43
  31/2-15	15.11.1984	42
  31/2-17 A	31.01.1992	42
  31/2-17 B	14.02.1992	3
  31/2-17 S	20.01.1992	80
  31/2-18	07.10.1992	110
  31/2-22 S	03.03.2021	119
  31/3-1	13.10.1983	139
  31/3-2	30.04.1984	63
  31/3-3	18.11.1984	139
  31/4-5	29.07.1981	8
  31/4-10	13.12.1995	73
  31/4-11	12.09.2000	31
  31/5-2	11.11.1983	76
  31/5-3	09.06.1984	66
  31/5-4 S	10.10.1990	88
  31/5-5	11.02.1993	82
  31/6-1	28.10.1983	122
  31/6-2	11.12.1983	156
  31/6-3	26.12.1983	137
  31/6-5	21.05.1984	154
  31/6-6	29.07.1984	141
  31/6-8	25.05.1985	131
  31/7-1	22.06.2016	65
  31/7-1 A	14.07.2016	55
  31/7-2 A	27.07.2017	77
  31/7-2 S	08.07.2017	83
  31/7-3 S	16.12.2018	47
  32/4-1	04.12.1996	23
  35/9-2	03.04.1991	19
  35/9-12 S	26.12.2014	1
  35/11-3 S	09.09.1989	4
  35/11-4	29.12.1990	93
  35/11-6	20.04.1992	31
  35/11-7	29.09.1992	88
  35/11-10	23.06.1997	102
  35/11-20 A	07.08.2016	31
  35/11-21 A	17.10.2018	39
  35/12-1	24.04.1992	7
  35/12-2	15.07.2009	54
  35/12-3 S	16.02.2011	32
  36/7-1	07.05.1996	36