TRYGGVASON FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	TRYGGVASON FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	173
  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

  Tryggvason Formation
  
  Name

  Named after Olav Trygvason, a Norwegian king (A.D. 995-1000).

  Well type section

  Norwegian well 25/1-1 from 3790 m to 3582 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 3190 m to 2864 m, coordinates N 61°51'05.98", E 03°46'28.22" (Fig 5.34) . No cores. Norwegian well 24/9-1 from 3783 m to 3638 m, coordinates N 59°16'09.48", E 01°47'31.18" (Fig 5.35) . No cores. Norwegian well 30/11-3 from 3207 m to 3162 m, coordinates N 60°02'38.59", E 02°32'15.47" (Fig 5.36) . No cores.

  Thickness

  In the Viking Graben, the formation is 208 m thick in the type well ( 25/1-1 ), 326 m in well 35/3-2 and 145 m in well 24/9-1 . It is 45 m thick in well 30/11-3 on the western margin of the Horda Platform.

  Lithology

  The Tryggvason Formation consists generally of mudstones with interbedded limestones. Interbedded sandstones are common in the Agat area. The content of limestones relative to mudstones is generally lower in the northern part of the Viking Graben (from blocks 30/2 and 30/3 northwards) than in the southern part. At the transition between the Viking Graben and the Horda Platform (e.g. block 30/11, (Fig 5.36) , the formation consists of limestone. The mudstones are light to dark grey, often calcareous, occasionally micaceous, glauconitic and pyritic. The limestones are white to light grey or brownish grey and argillaceous. The sandstones are clear to light grey, very fine to fine grained and cemented by calcite.

  Basal stratotype

  The lower boundary is defined by a decrease in gamma-ray intensity and an increase in velocity from the Blodøks Formation into the Tryggvason Formation (Fig 5.33 , 5.34) . This is due to the difference in carbonate content.

  Characteristics of the upper boundary

  The upper boundary shows an increase in gamma-ray intensity and a decrease in velocity from the Tryggvason Formation upwards into the Kyrre Formation (Fig 5.33) . This log change is due to the lower carbonate content of the Kyrre Formation .

  Distribution

  The formation is present in the Viking Graben and northern Tampen Spur area towards the Marulk Basin.

  Age

  Early to Mid Turonian.

  Depositional environment

  Open marine.

  Remarks

  The Tryggvason Formation is time-equivalent with the Herring Formation and the lower part of the Hod Formation in the central North Sea, and also with the informal “formation C” 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]
  15/3-3	09.08.1979	3250	3521
  15/3-7	01.09.2001	3327	3654
  15/3-8	11.04.2006	3341	3673
  15/3-9	13.08.2010	3304	3615
  15/3-11	09.08.2018	3161	3428
  15/3-12 A	03.03.2020	3205	3369
  15/3-12 S	20.01.2020	3133	3340
  15/6-10	06.04.2009	3277	3327
  15/9-19 A	09.11.1997	3584	3637
  15/9-19 B	02.02.1998	3654	3678
  15/9-19 SR2	25.07.1997	4113	4153
  15/9-19 SR	29.04.1993	4110	4150
  16/3-4	28.06.2011	1694	1706
  16/3-4 A	18.07.2011	1812	1824
  16/3-5	07.03.2013	1691	1699
  16/3-6	16.07.2013	1709	1724
  16/3-7	08.11.2013	1686	1703
  17/8-1	23.10.2021	1467	1485
  24/6-1	25.08.1985	3663	3925
  24/9-1	03.07.1976	3638	3783
  24/12-1	09.04.1978	3550	3672
  24/12-1 R	14.08.1978	3550	3672
  24/12-2	21.01.1982	3257	3598
  24/12-6 S	20.12.2010	3741	3913
  25/1-1	22.07.1971	3582	3790
  25/2-4	20.10.1975	3370	3632
  25/2-5	04.08.1976	3158	3240
  25/2-6	15.11.1977	3021	3083
  25/2-12	12.11.1988	3333	3550
  25/2-12 A	06.04.1989	3342	3610
  25/2-13	25.01.1990	3187	3268
  25/2-14	30.03.1991	2970	3029
  25/2-15	13.01.1993	3189	3346
  25/2-15 R	01.03.1993	3193	3350
  25/2-15 R2	11.04.1993	3193	3350
  25/2-16 S	13.09.2001	3488	3631
  25/2-18 A	19.10.2016	3337	3482
  25/2-18 B	30.10.2016	3504	3658
  25/2-18 C	17.11.2016	3342	3509
  25/2-18 S	11.09.2016	3077	3194
  25/2-19 A	08.10.2017	3264	3353
  25/2-23 S	01.04.2022	3735	4041
  25/4-1	09.12.1972	3062	3154
  25/4-5	26.03.1981	3258	3376
  25/4-6 S	24.08.1991	3335	3381
  25/4-6 SR	14.09.2003	3344	3390
  25/7-2	18.07.1990	3060	3260
  25/7-7	09.11.2019	3106	3344
  25/7-8 S	09.01.2020	2697	2743
  25/7-10	06.09.2022	3276	3438
  25/9-1	22.04.1995	2047	2050
  25/9-2 S	03.08.2003	2050	2067
  25/9-3	20.09.2009	2021	2027
  25/9-4	27.02.2014	2100	2137
  25/10-2 R	08.07.1972	2542	2623
  25/10-6 S	22.03.1996	3160	3521
  25/10-11	10.08.2011	3124	3311
  25/10-13 S	19.06.2015	2450	2475
  25/10-17 S	10.02.2023	3196	3276
  25/11-17	22.03.1993	1870	1882
  26/5-1	06.05.2013	1883	1910
  29/3-1	15.09.1986	3286	3435
  29/6-1	09.05.1982	3632	3743
  29/9-1	24.02.1984	3604	3770
  30/2-2	04.05.1985	3442	3679
  30/2-3	05.10.1992	3419	3543
  30/2-4 S	09.08.2008	3954	4140
  30/2-5 S	12.07.2020	3544	3781
  30/3-1	07.09.1979	3410	3605
  30/3-1 R	26.04.1982	3410	3605
  30/3-7 A	29.01.1998	4447	5852
  30/3-7 B	04.08.1998	3693	4261
  30/3-7 BR	17.11.2001	3693	4261
  30/3-7 S	12.12.1995	3969	4667
  30/3-9	01.07.2000	3236	3460
  30/3-10 S	29.04.2009	3418	3455
  30/3-11 S	09.09.2022	3494	3668
  30/4-1	14.05.1979	3520	3761
  30/4-3 S	09.10.2016	3904	3974
  30/5-1	29.07.1972	3178	3277
  30/5-2	21.12.1996	3167	3288
  30/5-3 A	30.05.2009	4090	4391
  30/5-3 S	12.04.2009	3220	3359
  30/5-4 A	16.11.2022	3680	4001
  30/5-4 S	23.09.2022	3680	4001
  30/6-27	30.10.2001	2996	3095
  30/7-3	25.10.1976	3475	3633
  30/7-7	01.07.1979	3569	3631
  30/8-3	05.01.1998	3044	3141
  30/9-2	12.07.1983	2505	2507
  30/9-2 R	07.07.1986	2505	2507
  30/9-8 R	25.09.1989	2704	2722
  30/9-19	22.10.1998	2954	3036
  30/9-19 A	21.12.1998	3062	3140
  30/9-24	17.10.2009	2838	2854
  30/9-25	20.09.2013	2678	2688
  30/10-5	01.05.1975	3630	3782
  30/10-6	09.11.1992	3608	3780
  30/11-3	14.03.1983	3162	3239
  30/11-4	24.07.1984	3156	3193
  30/11-7	03.02.2009	3425	3710
  30/11-7 A	25.05.2009	3450	3810
  30/11-8 A	03.07.2011	3481	3557
  30/11-8 S	20.05.2011	3378	3433
  30/11-10	26.12.2014	3238	3304
  30/11-10 A	13.02.2015	3482	3539
  31/3-4	05.01.2014	1545	1592
  31/8-1	24.07.2011	1494	1527
  31/11-1 S	28.06.2021	1595	1614
  32/4-1	04.12.1996	894	940
  32/4-2	21.09.2019	597	702
  32/4-3 S	26.10.2019	630	720
  33/2-2 S	10.06.2015	2829	2897
  33/5-1	18.10.1979	2650	2672
  33/5-2	18.11.1981	2828	3349
  33/6-2	02.01.1997	3110	3455
  33/6-3 S	24.07.2012	3320	3949
  33/6-5 S	16.10.2021	3105	3273
  33/9-16	20.01.1993	2625	2649
  33/9-17	04.05.1994	2858	2930
  33/9-18	20.12.1994	2821	2841
  33/9-18 A	24.01.1995	2996	3190
  33/9-22 S	17.09.2017	2622	2644
  34/2-2 R	08.05.1981	2970	3111
  34/2-5 S	31.03.2018	3247	3370
  34/3-1 A	30.10.2008	3450	3776
  34/3-1 S	10.09.2008	3429	3769
  34/3-2 S	30.12.2009	3417	3679
  34/3-3 A	03.01.2012	4042	4726
  34/3-3 S	19.11.2011	3433	3739
  34/4-5	06.04.1984	3015	3235
  34/4-8	21.06.1994	2600	2761
  34/4-10 R	18.04.2000	3323	3773
  34/4-11	10.01.2010	3340	3685
  34/4-14 S	19.05.2015	3357	4072
  34/4-15 A	12.08.2020	3360	3524
  34/4-15 S	15.07.2020	3184	3373
  34/4-16 S	31.03.2021	3150	3386
  34/4-18 S	06.03.2022	2496	2802
  34/5-1 A	10.04.2010	3802	4070
  34/5-1 S	13.03.2010	3355	3544
  34/5-2 S	04.07.2018	3285	3472
  34/6-1 S	28.08.2002	3240	3378
  34/6-2 A	12.12.2012	3207	3413
  34/6-2 S	05.11.2012	3208	3449
  34/6-3 A	01.11.2014	3363	3501
  34/6-3 S	24.09.2014	3377	3643
  34/6-4	02.03.2016	3291	3751
  34/6-5 S	08.06.2021	3207	3368
  34/7-36 S	17.09.2014	3320	3376
  34/8-2	17.11.1986	2699	2882
  34/8-6	03.11.1991	3352	3418
  34/8-7	16.07.1992	3260	3826
  34/8-7 R	10.02.1993	3260	3826
  34/8-10 S	09.12.1993	2838	2843
  34/8-13 A	13.05.2009	3045	3326
  34/8-13 S	26.06.2009	3830	3857
  34/8-15 S	19.02.2013	3340	3427
  34/9-1 S	19.06.2022	3581	3960
  34/10-20	23.04.1984	3045	3477
  34/10-23	13.10.1985	3450	3550
  34/10-54 A	18.04.2014	3328	3563
  34/10-54 S	11.02.2014	3275	3459
  34/10-55 S	26.03.2017	5300	7200
  34/11-1	25.10.1994	3200	3503
  34/11-2 S	17.05.1996	2762	3342
  34/11-5 S	03.07.2006	4848	5613
  34/11-6 S	26.01.2017	4841	5978
  34/12-1	30.04.2008	3497	3705
  35/1-1	18.07.2002	3301	3726
  35/3-1	26.10.1976	2962	3359
  35/3-2	26.10.1980	2864	3190
  35/3-4	06.06.1981	2714	3040
  35/3-5	31.03.1982	2569	2904
  35/3-6	02.04.2002	2223	2771
  35/3-7 S	01.10.2009	2847	3234
  35/4-1	24.05.1997	3326	3500
  35/4-3	17.05.2022	3351	3742
  35/6-2 S	04.04.2009	2375	2620
  35/6-3 S	25.08.2022	2270	2563
  35/7-1 S	15.08.2011	3360	3586
  35/8-1	24.01.1981	3047	3170
  35/8-2	21.05.1982	2947	3059
  35/8-5 S	20.07.2003	2847	3083
  35/8-6 A	14.05.2016	3293	3391
  35/8-6 S	22.04.2016	3397	3500
  35/9-5	07.02.2010	2237	2586
  35/9-6 S	07.12.2010	2802	2989
  35/9-7	14.04.2012	2482	2540
  35/9-8	11.04.2013	2549	2627
  35/9-9	18.11.2013	2173	2351
  35/9-10 S	26.11.2013	2922	2980
  35/9-11 A	21.05.2014	2800	2945
  35/9-11 S	15.04.2014	2800	2945
  35/9-13	20.01.2018	2508	2743
  35/9-14	02.03.2018	2502	2737
  35/9-14 A	29.03.2018	2606	2933
  35/9-16 A	25.04.2022	2277	2541
  35/9-16 S	06.04.2022	2160	2410
  35/10-1	16.01.1992	3007	3043
  35/10-2	22.08.1996	3414	3645
  35/10-4 A	12.11.2018	2860	3392
  35/10-4 S	10.10.2018	2860	3125
  35/11-2	04.12.1987	2675	2682
  35/11-13	28.05.2005	2565	2626
  35/11-14 S	07.12.2006	2547	2621
  35/11-15 S	28.06.2007	2470	2502
  35/11-16 S	18.03.2014	2839	2910
  35/11-18	27.09.2015	2885	2918
  35/11-18 A	16.12.2015	2934	2983
  35/11-20 A	07.08.2016	3239	3295
  35/11-20 B	15.09.2016	3632	3720
  35/11-20 S	19.06.2016	2837	2898
  35/11-22 S	02.02.2019	2639	2656
  35/12-3 S	16.02.2011	1842	1923
  35/12-4 A	17.07.2011	2792	2836
  35/12-5 S	19.06.2015	2412	2612
  35/12-6 A	30.06.2018	2545	2671
  35/12-6 S	14.06.2018	2484	2607
  36/1-2	27.10.1975	2217	2575
  36/1-3	25.03.2019	1972	2284
  36/1-4 S	30.01.2022	2360	2565
  36/7-4	26.09.2016	2005	2215
  6205/3-1 R	30.11.1990	2425	2876

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  25/4-1	09.12.1972	5