SKAGERRAK FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	SKAGERRAK FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	146
  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.	HEGRE GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Skagerrak Formation
  
  Name

  From the channel separating Norway from Denmark.

  Well type section

  Norwegian well 10/8-1 (Petronord) (Fig 1.12-14) . from 1567 to 2749 m below KB.

  Well reference section

  Norwegian well 17/10-1 (Norske Shell) (Fig 1.15-16) .

  Thickness

  The formation is 1182 m thick in the type well and thicker further east where seismic data indicate that it may reach a maximum thickness of over 3000 m. Westward from the type well the formation interdigitates with and progrades over the associated claystone sequence ( Smith Bank Formation ). The maximum thickness at the north-west limit of well control is 660 m and at the south-west limit 250 m.

  Lithology

  The formation consists of interbedded conglomerates, sandstones, siltstones and shales. Various shades of reds and browns are the dominant colours but light to dark grey beds are also present. Sandstones may be orthoquartzitic arkosic or highly lithic. Anhydrite, dolomite and limestone are subordinate lithologies.

  Boundaries

  The formation has gradational to sharp contacts with the claystone sequence of the Smith Bank Formation . Dip meter surveys suggest that in places this contact is an unconformity. Over some structures the formation rests on pre-Triassic rocks. The formation is normally overlain unconformably by Jurassic or younger sediments but in a few wells it passes up into the Gassum Formation (of Rhaetian age).

  Distribution

  The formation is present throughout the eastern part of the Central North Sea and the western Skagerrak. It may be missing over certain structures because of erosion or halokinesis.

  Age

  Middle to Late Triassic. It may possibly extend down to the Early Triassic in the areas of maximum development.

  Depositional environment

  The bulk of the Skagerrak Formation was probably deposited in a coalescing and prograding system of alluvial fans along the the eastern and southern flanks of a structurally controlled basin. The limited areal extent and poorly preserved faunal components suggest that some of the dark shale, carbonate and anhydrite beds were deposited in lakes. Better preserved microfossils and other indicators such as glauconite show that some beds were deposited when minor marine incursions occurred between floods of continental clastics.

  Source

  • Deegan, C. E. and Scull, B. J. (compilers) 1977: A standard lithostratigraphic nomenclature for the Central and Northern North Sea. UK Institute of Geological Sciences, Report 77/25. The Norwegian Petroleum Directorate, NPD-Bulletin No. 1, 36 pp.

• Wellbores penetrating

  Wellbores penetrating

  Wellbore name	Wellbore completion date	Top depth [m]	Bottom depth [m]
  1/3-12 S	22.07.2010	5818	5931
  2/1-3	29.03.1980	4101	4163
  2/1-4	03.08.1982	4346	4470
  2/1-6	12.08.1984	4587	4588
  2/1-8	23.11.1985	4081	4151
  2/1-10	14.01.1992	4435	4525
  2/1-13 S	07.03.2009	4362	4435
  2/2-1	03.07.1982	3820	3947
  2/3-1	03.04.1969	2580	2832
  2/3-3	20.11.1971	2875	2930
  2/4-23 S	05.09.2015	5310	5548
  2/5-6	16.08.1978	4087	4132
  2/5-7	24.02.1984	4387	4531
  2/5-10	26.08.1993	4587	4701
  2/5-10 A	25.09.1993	4673	4715
  2/5-13	21.01.2009	4576	4675
  2/6-6 S	18.01.2019	3521	3545
  2/8-12 S	27.04.1989	5225	5300
  3/7-2	20.06.1981	2945	2998
  3/7-11 S	27.05.2019	3611	3706
  6/3-1	01.02.1985	2978	3560
  6/3-2	10.03.1986	3165	3293
  7/1-1	05.08.1971	2661	2808
  7/4-2	13.03.2008	3400	3421
  7/8-5 S	03.06.2006	4021	4168
  7/9-1	29.05.1971	2609	2811
  7/11-7	25.12.1983	4566	4856
  7/11-7 R	08.10.1984	4566	4856
  7/11-12 A	31.12.2011	5587	5672
  7/11-12 S	16.07.2011	5213	5420
  7/11-13	03.11.2012	3697	3800
  7/12-3 A	06.09.1977	3929	4095
  7/12-5	07.06.1981	3917	4145
  7/12-6	24.07.1981	3521	3700
  7/12-8	23.12.1988	3814	3900
  7/12-9	14.05.1990	3760	3820
  7/12-10	29.08.1991	3642	3667
  7/12-11	06.11.1991	3800	3868
  8/1-1	07.02.1972	2704	2727
  8/3-1	10.10.1966	2113	2205
  8/3-2	04.12.1982	2417	2657
  8/4-1	25.07.1977	2513	2582
  8/10-1	01.07.1969	2833	2866
  8/10-2	17.03.1980	2752	2795
  8/10-3	06.10.2010	3158	3221
  8/10-4 A	18.12.2011	3602	3639
  8/10-4 S	27.10.2011	3004	3058
  8/10-5 A	24.05.2014	2470	2618
  8/10-5 S	04.03.2014	2760	2791
  8/10-6 S	16.07.2014	2110	2196
  8/11-1	29.06.1975	2871	3182
  8/12-1	23.07.1971	2813	2875
  9/1-1 S	21.11.2011	2484	2533
  9/2-1	28.04.1987	3685	3756
  9/2-2	21.09.1987	3498	3550
  9/3-1	04.09.1986	1955	1971
  9/3-2	09.12.2005	3118	3154
  9/4-1	19.05.1968	2329	2590
  9/4-2	29.08.1970	2633	3025
  9/4-3	19.08.1972	2613	2682
  9/4-4	20.08.1977	2845	2902
  9/4-5	01.08.2006	2836	4638
  9/11-1	19.08.1971	2121	2196
  9/12-1	06.05.1969	2107	2417
  10/5-1	26.06.1976	1539	1561
  10/8-1	17.01.1971	1567	2749
  11/9-1	28.02.1976	145	644
  11/10-1	19.08.1969	1900	2430
  15/3-3	09.08.1979	5033	5115
  15/3-4	30.03.1982	4044	4259
  15/5-7	07.09.2008	4008	4037
  15/6-3	19.12.1974	3579	3795
  15/6-4	16.08.1976	3268	3505
  15/6-5	29.11.1977	3723	3824
  15/6-6	09.06.1982	3655	3760
  15/6-7	08.06.1993	3411	3476
  15/6-8 S	05.04.1997	3174	3225
  15/6-9 A	13.06.2007	3666	3690
  15/6-9 S	27.05.2007	3872	3940
  15/6-10	06.04.2009	3613	3700
  15/6-12	09.02.2011	3876	3930
  15/6-13	15.05.2015	3499	3577
  15/6-13 A	03.06.2015	3860	3925
  15/6-13 B	29.06.2015	3670	3773
  15/6-15	02.06.2019	3645	3795
  15/6-16 S	28.06.2019	4130	4203
  15/9-1	30.05.1977	3701	3734
  15/9-2	17.06.1978	3699	3764
  15/9-3	03.04.1979	3703	3796
  15/9-4	14.06.1979	3629	3716
  15/9-5	11.04.1980	3769	3946
  15/9-6	07.09.1980	3828	3946
  15/9-8	25.05.1981	3625	3676
  15/9-9	14.07.1981	2642	2776
  15/9-10	07.11.1981	3183	3241
  15/9-14	27.06.1982	3360	3543
  15/9-15	01.08.1982	2821	3200
  15/9-17	30.03.1983	2741	2847
  15/9-18	02.03.1984	3420	3593
  15/9-19 A	09.11.1997	3966	4097
  15/9-19 SR	29.04.1993	4340	4641
  15/9-19 SR2	25.07.1997	4343	4644
  15/9-20 S	20.03.1994	3259	3503
  15/9-22	13.03.2006	3756	3923
  15/9-23	03.01.2010	3169	3225
  15/12-1	06.09.1975	3204	3269
  15/12-5	04.05.1986	3077	3150
  15/12-6 S	04.11.1990	2979	3050
  15/12-7 S	07.01.1991	3036	3477
  15/12-8	14.07.1991	2854	3054
  15/12-8 A	29.07.1991	2856	2940
  15/12-9 S	08.10.1992	3688	3848
  15/12-10 S	04.11.1996	3429	3550
  15/12-11 S	19.05.1997	3544	3597
  15/12-12	09.02.2001	2977	3085
  15/12-13 B	11.06.2003	3092	3151
  15/12-16 S	31.03.2006	2914	2961
  15/12-17 A	23.03.2007	3550	3620
  15/12-17 S	04.02.2007	3331	3345
  15/12-19	20.05.2008	2973	3212
  15/12-20 S	01.07.2008	3874	4192
  15/12-21	21.05.2009	3122	3310
  15/12-21 A	21.06.2009	3493	3702
  15/12-22	16.05.2010	2985	3035
  15/12-23	29.05.2010	3192	3485
  15/12-24 S	20.05.2015	3097	3181
  16/1-2	07.08.1976	2424	2620
  16/1-7	28.05.2004	3083	3186
  16/1-9	22.04.2008	2456	2544
  16/1-11	26.04.2010	2401	2625
  16/1-11 A	09.05.2010	2501	2595
  16/1-14	30.11.2010	2496	2550
  16/1-16	07.12.2012	2429	2642
  16/1-16 A	01.01.2013	2729	2897
  16/1-18	14.05.2014	1894	1985
  16/1-20 A	21.10.2013	3060	3106
  16/1-21 A	20.04.2015	3194	3313
  16/1-21 S	03.03.2015	2491	2630
  16/1-22 A	04.06.2015	2769	2896
  16/1-22 B	14.06.2015	3066	3215
  16/1-22 S	27.05.2015	2506	2640
  16/1-23 S	25.08.2015	1953	2094
  16/1-26 S	14.04.2016	4896	5330
  16/1-27	11.04.2017	1968	2240
  16/1-33 S	05.08.2020	3068	3158
  16/1-35 S	28.02.2023	3177	3257
  16/2-6	20.09.2010	1955	2075
  16/2-7	01.09.2011	1986	2134
  16/2-7 A	29.09.2011	2041	2100
  16/2-8	19.08.2011	1951	2140
  16/2-9 S	24.09.2011	1949	1986
  16/2-10	28.10.2011	1968	2090
  16/2-11	29.03.2012	1946	2126
  16/2-11 A	04.05.2012	2239	2365
  16/2-13 A	29.09.2012	2626	2658
  16/2-13 S	30.08.2012	1949	1955
  16/2-14	17.11.2012	1887	1982
  16/2-15	13.01.2013	1969	2006
  16/2-16	12.12.2012	1999	2065
  16/2-16 A	07.02.2013	2385	2503
  16/2-17 S	20.05.2013	2020	2052
  16/2-19	03.04.2014	1952	1989
  16/2-19 A	03.05.2014	2283	2310
  16/2-20 A	16.02.2014	2125	2167
  16/2-20 S	21.11.2013	2038	2095
  16/2-21	07.06.2013	1965	2070
  16/2-U-18	28.11.2016	2057	2143
  16/4-6 S	03.05.2013	1955	2198
  16/4-7	21.08.2013	2529	2600
  16/4-8 S	26.08.2014	1934	2700
  16/4-9 S	16.08.2015	1984	2358
  16/4-11	01.04.2018	1950	2069
  16/5-2 S	28.01.2012	1967	2042
  16/5-3	20.03.2013	1912	1990
  16/5-4	28.09.2013	1936	2100
  16/5-6	10.07.2016	2241	2350
  16/7-4	06.12.1982	2521	2781
  16/7-5	03.08.1984	2594	2775
  16/7-6	24.07.1997	2565	2725
  16/7-7 S	29.12.1997	2770	2994
  16/7-8 S	19.01.2003	2856	2900
  16/7-9	03.01.2011	2515	2553
  16/7-11	04.09.2015	2546	2650
  16/9-1	12.07.1968	2464	3074
  16/10-1	14.07.1986	3053	3116
  16/10-2	01.08.1991	2923	3150
  16/10-3	01.12.1996	2532	2626
  16/10-4	10.08.1998	2547	2550
  17/4-1	26.08.1968	2352	2532
  17/6-1	07.02.2011	2988	3065
  17/8-1	23.10.2021	2466	2544
  17/9-1 R	11.06.1974	2992	3161
  17/10-1	24.03.1969	2825	3398
  17/11-1	30.06.1968	2211	2315
  17/11-2	17.05.1976	2521	2608
  17/12-1 R	21.06.1972	2446	3965
  17/12-3	03.02.1980	2638	2730
  17/12-4	10.07.2009	2439	2470
  18/10-1	01.01.1980	2506	2800
  25/4-5	26.03.1981	4127	4207
  25/6-1	03.02.1986	2503	2651
  25/7-8 S	09.01.2020	3120	3250
  25/8-19 A	19.03.2020	2483	2806
  25/8-19 S	30.12.2019	2434	2716
  25/8-20 B	28.05.2021	2438	2698
  25/8-20 S	10.05.2021	2504	2733
  25/8-21 S	20.06.2021	2391	2633
  25/8-22 S	20.07.2021	2325	2589
  25/10-10	02.04.2010	2173	2368
  25/10-12 S	18.01.2015	2439	2540
  25/10-15 S	02.08.2016	2564	2628
  25/10-16 A	09.08.2018	3653	3680
  25/10-16 A	09.08.2018	3686	3704
  25/10-16 B	18.08.2018	4832	4893
  25/10-16 C	26.08.2018	4305	4405
  25/10-16 S	30.07.2018	2655	2701
  25/10-16 S	30.07.2018	2706	2712
  25/10-17 S	10.02.2023	4052	4150
  25/11-1	09.07.1967	2109	2391
  25/11-29 S	13.05.2019	2147	2230

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  1/3-12 S	22.07.2010	8
  2/5-10	26.08.1993	3
  2/8-12 S	27.04.1989	17
  6/3-1	01.02.1985	137
  6/3-2	10.03.1986	32
  7/4-2	13.03.2008	20
  7/11-7	25.12.1983	46
  7/12-6	24.07.1981	126
  7/12-10	29.08.1991	13
  7/12-11	06.11.1991	9
  8/10-4 S	27.10.2011	24
  8/10-5 S	04.03.2014	10
  8/10-6 S	16.07.2014	0
  15/6-3	19.12.1974	59
  15/6-4	16.08.1976	37
  15/6-7	08.06.1993	16
  15/6-8 S	05.04.1997	7
  15/9-9	14.07.1981	107
  15/9-15	01.08.1982	57
  15/9-17	30.03.1983	53
  15/9-19 A	09.11.1997	50
  15/9-19 SR	29.04.1993	42
  15/12-6 S	04.11.1990	8
  15/12-7 S	07.01.1991	18
  15/12-8 A	29.07.1991	46
  15/12-10 S	04.11.1996	18
  15/12-12	09.02.2001	19
  15/12-19	20.05.2008	156
  15/12-20 S	01.07.2008	24
  15/12-21	21.05.2009	45
  15/12-23	29.05.2010	104
  16/1-11	26.04.2010	121
  16/1-16	07.12.2012	13
  16/1-18	14.05.2014	83
  16/1-21 A	20.04.2015	30
  16/1-21 S	03.03.2015	96
  16/1-22 S	27.05.2015	44
  16/1-23 S	25.08.2015	117
  16/1-27	11.04.2017	52
  16/2-6	20.09.2010	3
  16/2-7 A	29.09.2011	12
  16/2-8	19.08.2011	56
  16/2-9 S	24.09.2011	33
  16/2-11	29.03.2012	7
  16/2-11 A	04.05.2012	4
  16/2-13 A	29.09.2012	32
  16/2-13 S	30.08.2012	6
  16/2-14	17.11.2012	18
  16/2-15	13.01.2013	22
  16/2-16 A	07.02.2013	35
  16/2-17 S	20.05.2013	21
  16/2-19	03.04.2014	37
  16/2-19 A	03.05.2014	22
  16/2-20 A	16.02.2014	14
  16/2-20 S	21.11.2013	16
  16/2-21	07.06.2013	11
  16/4-6 S	03.05.2013	69
  16/4-8 S	26.08.2014	74
  16/4-9 S	16.08.2015	80
  16/4-11	01.04.2018	52
  16/5-2 S	28.01.2012	7
  16/5-3	20.03.2013	11
  16/5-4	28.09.2013	27
  16/7-4	06.12.1982	94
  16/7-5	03.08.1984	9
  16/7-6	24.07.1997	61
  16/7-7 S	29.12.1997	116
  17/9-1 R	11.06.1974	5
  17/11-2	17.05.1976	8
  25/4-5	26.03.1981	32
  25/7-8 S	09.01.2020	14
  25/8-19 A	19.03.2020	8
  25/8-19 S	30.12.2019	88
  25/8-20 S	10.05.2021	52
  25/8-21 S	20.06.2021	110
  25/11-1	09.07.1967	25