SVARTE FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	SVARTE FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	160
  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.	SHETLAND GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Svarte Formation
  
  Name

  Named after Halvdan Svarte, King of Ringerike, Norway about A.D. 850.

  Well type section

  Norwegian well 25/1-1 from 3995 m to 3807 m, coordinates N 59°53'17.40", E 02°04'42.70" (Fig 5.33) . No cores.

  Well reference sections

  Norwegian well 35/3-2 from 3447 m to 3207 m, coordinates N 61°51'05.98", E 03°46'28.22" (Fig 5.34) . No cores. Norwegian well 24/9-1 from 3992 m to 3804 m, coordinates N 59°16'09.48", E 01°47'31.18" (Fig 5.35) . No cores.

  Thickness

  In the Viking Graben, the formation is 188 m thick in the type well 25/1-1 , 240 m in well 35/3-2 and 188 m in well 24/9-1 .

  Lithology

  The formation generally consists of mudstones interbedded with limestones. Sandstones occur in the Agat area. The content of limestones relative to mudstones is generally lower in the northern than in the southern part of the Viking Graben. The mudstones are medium to light grey, often calcareous, occasionally micaceous, glauconitic and pyritic. The limestones are mainly white to medium grey, argillaceous or sandy. The sandstones are clear to light grey and often cemented by calcite.

  Basal stratotype

  The lower boundary shows a general upward decrease in gamma-ray intensity and an increase in velocity from the Cromer Knoll Group into the Svarte Formation (Fig 5.34) . This is due to a higher content of carbonate in the Svarte Formation.

  Characteristics of the tipper boundary

  The upper boundary is generally easily located, and is characterised by an increase in gamma-ray intensity and a distinct decrease in velocity from the Svarte Formation up into the Blodøks Formation (Fig 5.33) . This is caused by a lower carbonate content in the Blodøks Formation .

  Distribution

  The formation is present in the Viking Graben and north of the Tampen Spur towards the Marulk Basin. It is, however, lacking on structural highs such as the Lomre Terrace (e.g. Norwegian wells 35/8-1 and 35/8-2), (Nybakken and Backstrøm, in press).

  Age

  Cenomanian.

  Depositional environment

  Open marine.

  Remarks

  The Svarte Formation is time-equivalent with the Hidra Formation in the central North Sea and with the informal “formation A” of Deegan & Scull (1977) (Fig 5.6) .

  Source

  • Isaksen, D. and Tonstad, K. (eds.) 1989: A revised Cretaceous and Tertiary lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin No. 5, 59 pp.

• Wellbores penetrating

  Wellbores penetrating

  Wellbore name	Wellbore completion date	Top depth [m]	Bottom depth [m]
  15/3-1 S	06.07.1975	3698	3812
  15/3-3	09.08.1979	3628	3743
  15/3-4	30.03.1982	3390	3525
  15/3-5	13.05.1984	3486	3623
  15/3-7	01.09.2001	3668	3752
  15/3-8	11.04.2006	3686	3794
  15/3-9	13.08.2010	3625	3721
  15/6-5	29.11.1977	3302	3337
  15/6-6	09.06.1982	3354	3377
  15/6-7	08.06.1993	3196	3219
  15/6-8 S	05.04.1997	3075	3085
  15/6-10	06.04.2009	3330	3404
  15/6-12	09.02.2011	3526	3629
  15/6-15	02.06.2019	3274	3301
  15/6-16 S	28.06.2019	3601	3699
  15/8-1	07.01.1982	3335	3436
  15/9-1	30.05.1977	3140	3300
  15/9-3	03.04.1979	3242	3285
  15/9-10	07.11.1981	2924	2955
  15/9-13	27.05.1982	2664	2674
  15/9-14	27.06.1982	3075	3082
  15/9-18	02.03.1984	2993	3013
  15/9-19 A	09.11.1997	3651	3655
  15/9-19 B	02.02.1998	3701	3713
  15/9-19 SR2	25.07.1997	4171	4179
  15/9-19 SR	29.04.1993	4168	4176
  15/9-21 S	23.05.1998	4208	4272
  15/12-1	06.09.1975	2961	2992
  15/12-2	27.02.1976	2542	2650
  15/12-10 S	04.11.1996	3107	3204
  15/12-11 S	19.05.1997	3146	3221
  16/2-6	20.09.2010	1777	1805
  16/2-7	01.09.2011	1762	1801
  16/2-7 A	29.09.2011	1830	1870
  16/2-8	19.08.2011	1767	1787
  16/2-10	28.10.2011	1780	1809
  16/2-11	29.03.2012	1764	1783
  16/2-11 A	04.05.2012	2011	2050
  16/2-12	06.09.2012	1803	1817
  16/2-13 A	29.09.2012	2393	2431
  16/2-13 S	30.08.2012	1761	1799
  16/2-15	13.01.2013	1769	1797
  16/2-16	12.12.2012	1791	1824
  16/2-16 A	07.02.2013	2144	2198
  16/2-17 B	16.06.2013	2038	2069
  16/2-17 S	20.05.2013	1771	1797
  16/2-18 S	08.08.2013	1810	1820
  16/2-19	03.04.2014	1823	1838
  16/2-19 A	03.05.2014	2144	2168
  16/2-21	07.06.2013	1769	1806
  16/2-U-18	28.11.2016	1817	1852
  16/2-U-19	12.12.2016	1821	1836
  16/3-2	08.03.1976	1682	1785
  16/3-4	28.06.2011	1741	1783
  16/3-4 A	18.07.2011	1865	1915
  16/3-5	07.03.2013	1729	1769
  16/3-6	16.07.2013	1752	1789
  16/3-7	08.11.2013	1736	1776
  16/3-8 A	01.04.2014	1795	1840
  16/3-8 S	16.03.2014	1795	1834
  16/3-U-1	24.12.2016	1739	1782
  16/3-U-1 A	10.01.2017	1901	1971
  16/3-U-1 B	15.01.2017	1901	1971
  16/5-1	08.02.1971	1848	1859
  16/5-2 S	28.01.2012	1785	1816
  16/5-3	20.03.2013	1776	1807
  16/5-4	28.09.2013	1784	1822
  16/5-7	12.07.2019	1826	1841
  16/6-1	19.01.1968	1734	1771
  16/7-8 S	19.01.2003	2778	2787
  16/10-1	14.07.1986	2691	2750
  16/10-2	01.08.1991	2716	2778
  16/10-3	01.12.1996	2350	2361
  17/8-1	23.10.2021	1485	1540
  24/6-1	25.08.1985	3932	4152
  24/9-1	03.07.1976	3804	3992
  24/12-1	09.04.1978	3681	3848
  24/12-1 R	14.08.1978	3681	3848
  24/12-2	21.01.1982	3654	3840
  24/12-6 S	20.12.2010	3917	4148
  25/1-1	22.07.1971	3807	3995
  25/2-5	04.08.1976	3259	3292
  25/2-12	12.11.1988	3572	3606
  25/2-12 A	06.04.1989	3630	3708
  25/2-13	25.01.1990	3286	3318
  25/2-15	13.01.1993	3365	3465
  25/2-15 R	01.03.1993	3369	3469
  25/2-15 R2	11.04.1993	3369	3469
  25/2-16 S	13.09.2001	3640	3693
  25/2-18 A	19.10.2016	3490	3524
  25/2-18 B	30.10.2016	3665	3700
  25/2-18 C	17.11.2016	3517	3559
  25/2-18 S	11.09.2016	3201	3225
  25/2-19 A	08.10.2017	3363	3432
  25/2-23 S	01.04.2022	4050	4253
  25/4-5	26.03.1981	3379	3479
  25/4-6 S	24.08.1991	3485	3532
  25/4-6 SR	14.09.2003	3494	3541
  25/7-2	18.07.1990	3295	3399
  25/7-2	18.07.1990	3447	3714
  25/7-7	09.11.2019	3556	3787
  25/7-10	06.09.2022	3666	3918
  25/8-7	12.08.1995	2209	2267
  25/8-9	28.01.1997	2323	2355
  25/9-1	22.04.1995	2050	2118
  25/9-2 S	03.08.2003	2067	2110
  25/9-3	20.09.2009	2027	2062
  25/9-4	27.02.2014	2137	2197
  25/10-6 S	22.03.1996	3639	3885
  25/10-11	10.08.2011	3470	3627
  25/10-17 S	10.02.2023	3285	3335
  25/11-17	22.03.1993	1882	1921
  29/3-1	15.09.1986	3440	3462
  29/6-1	09.05.1982	3777	3807
  29/9-1	24.02.1984	3785	3906
  30/3-7 A	29.01.1998	5864	5895
  30/3-9	01.07.2000	3469	3619
  30/3-10 S	29.04.2009	3467	3602
  30/3-11 S	09.09.2022	3691	3851
  30/4-1	14.05.1979	3770	3926
  30/4-3 S	09.10.2016	3994	4079
  30/5-1	29.07.1972	3323	3576
  30/5-2	21.12.1996	3292	3468
  30/5-3 A	30.05.2009	4404	4560
  30/5-3 S	12.04.2009	3380	3396
  30/5-4 S	23.09.2022	4006	4170
  30/7-3	25.10.1976	3665	3838
  30/7-7	01.07.1979	3655	3870
  30/8-1 S	01.03.1995	3243	3361
  30/8-1 SR	01.03.1996	3243	3361
  30/8-3	05.01.1998	3141	3189
  30/9-8 R	25.09.1989	2723	2725
  30/9-20 S	11.02.2002	2629	2703
  30/9-25	20.09.2013	2688	2768
  30/9-28 S	26.02.2016	2807	2870
  30/10-5	01.05.1975	3805	3972
  30/10-6	09.11.1992	3803	3931
  30/11-4	24.07.1984	3193	3225
  30/11-8 A	03.07.2011	3557	3671
  30/11-8 S	20.05.2011	3433	3474
  30/11-10	26.12.2014	3304	3378
  30/11-10 A	13.02.2015	3539	3610
  30/12-1	07.03.1994	2610	2622
  31/1-2 A	29.01.2021	2901	2929
  31/1-2 S	12.01.2021	2680	2692
  31/3-4	05.01.2014	1592	1617
  31/5-7	06.03.2020	1741	1778
  31/8-1	24.07.2011	1540	1599
  31/11-1 S	28.06.2021	1628	1673
  32/4-1	04.12.1996	956	1081
  32/4-2	21.09.2019	702	735
  32/4-3 S	26.10.2019	720	744
  33/5-2	18.11.1981	3359	3750
  33/6-3 S	24.07.2012	3949	3975
  33/9-16	20.01.1993	2649	2654
  33/9-16	20.01.1993	2662	2665
  34/2-2 R	08.05.1981	3147	3203
  34/2-3	13.08.1981	2834	3105
  34/2-4	11.06.1985	3287	3300
  34/4-11	10.01.2010	3685	3819
  34/4-13 S	02.01.2011	4171	4352
  34/4-14 S	19.05.2015	4072	4157
  34/6-3 A	01.11.2014	3501	3534
  34/6-3 S	24.09.2014	3643	3759
  34/6-4	02.03.2016	3759	3786
  34/7-15 S	03.09.1990	2957	3165
  34/8-7	16.07.1992	3826	4034
  34/8-7 R	10.02.1993	3826	4034
  34/8-10 S	09.12.1993	2850	2871
  34/9-1 S	19.06.2022	3975	4225
  34/10-20	23.04.1984	3477	3650
  34/10-23	13.10.1985	3565	3690
  34/10-42 S	19.09.1999	3656	3790
  34/10-54 A	18.04.2014	3563	3825
  34/10-54 S	11.02.2014	3459	3678
  34/11-1	25.10.1994	3503	3750
  34/11-2 S	17.05.1996	3342	3559
  34/11-4	14.04.1999	3512	3697
  34/11-5 S	03.07.2006	5613	6115
  34/11-6 S	26.01.2017	5978	6208
  34/12-1	30.04.2008	3748	3922
  35/3-1	26.10.1976	3387	3725
  35/3-2	26.10.1980	3207	3447
  35/3-4	06.06.1981	3088	3345
  35/3-5	31.03.1982	2912	3181
  35/3-6	02.04.2002	2786	2955
  35/3-7 S	01.10.2009	3237	3305
  35/4-1	24.05.1997	3510	3675
  35/4-3	17.05.2022	3760	3998
  35/6-2 S	04.04.2009	2657	2946
  35/6-3 S	25.08.2022	2563	2780
  35/7-1 S	15.08.2011	3651	3726
  35/8-1	24.01.1981	3172	3180
  35/8-3	15.10.1988	3127	3140
  35/8-4	10.08.1999	3206	3213
  35/8-5 S	20.07.2003	3087	3104
  35/8-6 A	14.05.2016	3391	3412
  35/8-6 S	22.04.2016	3500	3521
  35/9-1	07.05.1989	1940	1967
  35/9-1 R	27.07.1989	1940	1967
  35/9-3	11.11.1997	2380	2598
  35/9-5	07.02.2010	2598	2713
  35/9-6 S	07.12.2010	2991	3030
  35/9-8	11.04.2013	2633	2705
  35/9-9	18.11.2013	2366	2478
  35/9-10 S	26.11.2013	2991	3040
  35/9-11 A	21.05.2014	2970	2981
  35/9-11 S	15.04.2014	2970	2981
  35/9-12 S	26.12.2014	2610	2794
  35/9-13	20.01.2018	2776	3168
  35/9-14	02.03.2018	2774	3189
  35/9-14 A	29.03.2018	2968	3384
  35/9-16 A	25.04.2022	2581	2794
  35/9-16 S	06.04.2022	2435	2573
  35/10-1	16.01.1992	3058	3066
  35/10-4 A	12.11.2018	3404	3456
  35/10-4 S	10.10.2018	3135	3163
  35/10-7 A	27.12.2021	2862	2916
  35/10-7 S	11.12.2021	2763	2830
  35/11-8 S	11.05.1996	2598	2678
  35/11-9	01.05.1997	2303	2381
  35/11-11	22.05.1998	2343	2420
  35/11-12	14.05.2000	2719	2745
  35/11-13	28.05.2005	2646	2671
  35/11-14 S	07.12.2006	2646	2675
  35/11-15 S	28.06.2007	2506	2558
  35/11-16 S	18.03.2014	2916	2923
  35/11-20 A	07.08.2016	3295	3323
  35/11-20 B	15.09.2016	3720	3745
  35/11-20 S	19.06.2016	2898	2914
  35/11-22 S	02.02.2019	2663	2704
  35/11-24 A	28.08.2020	2845	2890
  35/11-24 B	16.09.2020	2876	2903
  35/11-24 S	09.08.2020	2661	2680
  35/11-25 A	04.06.2021	2557	2633
  35/11-25 S	14.05.2021	2482	2556
  35/12-1	24.04.1992	1924	2180
  35/12-3 S	16.02.2011	1930	1980
  35/12-5 S	19.06.2015	2618	2653
  35/12-6 A	30.06.2018	2680	2760
  35/12-6 S	14.06.2018	2617	2719
  36/1-2	27.10.1975	2597	2815
  36/1-3	25.03.2019	2295	2508
  36/1-4 S	30.01.2022	2583	2766
  36/4-1	01.10.1996	2271	2305
  36/7-1	07.05.1996	1976	2020
  36/7-3	06.01.2002	2290	2515
  36/7-4	26.09.2016	2220	2376
  6204/10-1	23.11.1995	2335	2465
  6204/11-1	14.11.1994	2422	2602
  6204/11-2	28.12.1997	2402	2659
  6205/3-1	11.02.1990	2891	3133
  6205/3-1 R	30.11.1990	2891	3133

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]