DRAKE FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	DRAKE FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	27
  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.	DUNLIN GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Drake Formation
  
  Name

  Named by Deegan and Scull (1977) who gave it "sub-unit" status.

  Well type section

  UK well 211/29-3 (Shell) from 2829 m to 2887 m, coord N 61°08'06", E 01°43'36.5" (Fig 3.10) .

  Well reference sections

  Norwegian wells 33/9-1 (Mobil) from 2668 m to 2715 m, coord N 61°15'07.5", E 01°50'25.8" (Fig 3.11) . 30/6-7 (Norsk Hydro) from 2786 m to 2975 m, coord N 60°38' 39.49'', E 02°45'21.74" (Fig 3.12) . 31/2-1 (Shell) from 1985 m to 2093 m, coord N 60°46'19.16", E 03°33'15.87" (Fig 3.13) . 25/2-4 (Elf) from 3876 m to 3895 m, coord N 59°58'44.09", E 02°22'58.88" (Fig 3.15) .

  Thickness

  58 m in the type well, 47 m in 33/9-1 , 189 m in 30/6-7 , 108 m in 31/2-1 and 19 m in 25/2-4 .

  Lithology

  In the type well the lower part of the formation consists of medium grey, slightly sandy, calcareous claystone. The upper part is dark grey to black, fissile, micaceous shale containing calcareous nodules. On the Horda Platform and along its western margin white to grey, fine to coarse sandstones are found within the formation. The sandstones are often hard and calcite cemented. They also show and "upward coarsening" on the gamma ray log. The claystone is often silty.

  Boundaries

  In the basinal areas, where the sandstones are not present, the formation has more regular gamma ray and sonic log responses than that of the underlying formation, the gamma ray response being uniformly higher and the velocity lower. The lower velocity is also apparent where sandstone beds are present. The upper boundary is marked by the presence of arenaceous sediments of the overlying Brent Group , and the upper boundary is placed at the base of the upward coarsening sequence of the Rannoch Formation of the Brent Group . The Brent Group shows a more erratic sonic log pattern than the Drake Formation. In the south the top of the formation is marked by an unconformity (e.g. well 25/2-4 , (Fig 3.15) . In the northernmost area where the Brent Group is not recognised, the Dunlin Group is often unconformably overlain by the Viking Group .

  Distribution

  The formation is widely distributed throughout the East Shetland Basin and northern Horda Platform. It thins towards the west and south, where it may be absent due to erosion. The sand developments within the formation seem to be a function of marginal position within of the basin.

  Age

  Toarcian to Bajocian.

  Depositional environment

  The Drake Formation is generally considered to have been deposited in prodelta and delta front environments.

  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]
  25/2-4	20.10.1975	3876	3927
  25/2-5	04.08.1976	3489	3513
  25/2-13	25.01.1990	3491	3565
  25/2-18 A	19.10.2016	4049	4066
  25/2-18 C	17.11.2016	4301	4369
  25/2-18 S	11.09.2016	3783	3887
  25/5-1	01.08.1987	3060	3129
  25/5-1 A	16.09.1987	3403	3432
  25/5-2	04.07.1989	3231	3304
  25/5-3	26.03.1990	2453	2475
  25/6-1	03.02.1986	2297	2344
  25/6-2	29.05.1992	2345	2392
  26/4-1	17.07.1987	2872	3095
  29/3-1	15.09.1986	3912	4046
  29/6-1	09.05.1982	4500	4546
  29/9-1	24.02.1984	4421	4487
  30/2-1	12.10.1982	3793	3962
  30/2-2	04.05.1985	4135	4172
  30/2-3	05.10.1992	3983	4161
  30/3-1 R	26.04.1982	3874	4081
  30/3-2 R	16.02.1981	2950	2982
  30/3-3	30.05.1983	3116	3241
  30/3-4	12.06.1985	2949	3079
  30/3-4 R	18.11.2001	2951	3081
  30/3-5 S	19.06.1992	4243	4424
  30/3-6 S	06.03.1994	5688	5823
  30/3-7 A	29.01.1998	6620	6678
  30/3-7 B	04.08.1998	4350	4378
  30/3-7 B	04.08.1998	4948	5124
  30/3-7 B	04.08.1998	5777	5897
  30/3-7 BR	17.11.2001	4350	4378
  30/3-7 BR	17.11.2001	4948	5124
  30/3-7 BR	17.11.2001	5777	5897
  30/3-7 S	12.12.1995	4930	4966
  30/3-7 S	12.12.1995	5122	5138
  30/3-8 A	23.05.2000	4554	4654
  30/3-8 A	23.05.2000	4654	4752
  30/3-8 A	23.05.2000	4827	4830
  30/3-8 S	04.05.2000	4486	4488
  30/3-8 S	04.05.2000	4554	4752
  30/3-8 S	04.05.2000	4827	5120
  30/3-9	01.07.2000	3923	4015
  30/3-10 S	29.04.2009	3752	3871
  30/3-11 S	09.09.2022	4612	4642
  30/3-11 S	09.09.2022	4653	4658
  30/4-1	14.05.1979	5400	5454
  30/4-2	16.05.1980	4061	4127
  30/5-2	21.12.1996	4041	4076
  30/6-1	22.09.1979	2345	2537
  30/6-2	11.12.1979	2237	2431
  30/6-3	07.03.1980	2512	2689
  30/6-4	11.05.1981	2686	2855
  30/6-5	15.08.1981	2958	3071
  30/6-6	24.03.1982	2965	3152
  30/6-7	24.08.1982	2786	2975
  30/6-8	06.08.1982	3171	3350
  30/6-9	16.12.1982	2620	2821
  30/6-9 R	12.05.1990	2618	2819
  30/6-10	02.12.1982	2575	2656
  30/6-10 A	03.03.1983	2608	2665
  30/6-13	14.05.1983	2671	2775
  30/6-13 R	11.09.1986	2671	2775
  30/6-14	08.02.1984	2589	2679
  30/6-15	05.09.1984	2902	3101
  30/6-16	21.01.1985	2868	2920
  30/6-17 A	18.03.1986	2420	2460
  30/6-17 R	04.02.1986	2309	2402
  30/6-18	23.11.1985	2913	2983
  30/6-19	21.06.1986	2989	3103
  30/6-19 R	25.05.1994	2988	3102
  30/6-20	13.04.1986	2673	2747
  30/6-21	09.04.1987	2670	2854
  30/6-22	13.07.1988	2998	3122
  30/6-22 R	02.06.1994	2997	3121
  30/6-23	01.07.1990	2902	3016
  30/6-25 S	06.01.1999	2713	2830
  30/6-25 S	06.01.1999	2918	2988
  30/6-29 S	03.03.2015	5396	5534
  30/6-30	18.11.2018	3447	3493
  30/7-6 R	03.06.1978	4057	4115
  30/8-1 S	01.03.1995	4123	4450
  30/8-1 SR	01.03.1996	4123	4450
  30/8-3	05.01.1998	3663	3720
  30/9-1	29.01.1983	2783	2895
  30/9-2	12.07.1983	2767	2830
  30/9-2 R	07.07.1986	2767	2830
  30/9-3	26.02.1984	3045	3113
  30/9-3 A	20.05.1984	3133	3455
  30/9-4 S	30.03.1985	3633	3924
  30/9-5 S	19.07.1985	2253	2447
  30/9-6	21.04.1987	2723	2835
  30/9-7	23.12.1988	3168	3288
  30/9-8 R	25.09.1989	3149	3200
  30/9-9	06.11.1989	2418	2575
  30/9-10	21.09.1990	3117	3404
  30/9-11	19.11.1990	2516	2570
  30/9-11 A	29.12.1990	2680	2836
  30/9-12	09.05.1991	2791	2944
  30/9-12 A	04.06.1991	3007	3061
  30/9-12 AR	11.07.2002	3011	3065
  30/9-13 S	11.10.1991	3452	3758
  30/9-13 SR	17.07.2002	3456	3762
  30/9-14	14.05.1993	3512	3680
  30/9-15	05.01.1994	2276	2461
  30/9-16	08.08.1994	3001	3073
  30/9-18	11.04.1995	2954	2994
  30/9-19	22.10.1998	3510	3560
  30/9-19 A	21.12.1998	3730	3775
  30/9-20 S	11.02.2002	3072	3124
  30/9-21 A	15.06.2008	4054	4086
  30/9-22	10.03.2009	3205	3255
  30/9-28 S	26.02.2016	3311	3488
  30/9-B-18	25.09.1992	3941	3980
  30/10-5	01.05.1975	4860	4967
  30/11-3	14.03.1983	4019	4218
  30/11-4	24.07.1984	4010	4210
  30/11-5	09.01.1997	3716	3726
  30/11-6 S	02.07.2004	3497	3550
  30/11-7	03.02.2009	4027	4067
  30/11-8 A	03.07.2011	4436	4475
  30/11-8 S	20.05.2011	3998	4043
  30/11-10	26.12.2014	4013	4079
  30/11-14	06.07.2016	3420	3467
  30/11-14 B	23.07.2016	4147	4187
  30/12-1	07.03.1994	3133	3409
  31/1-1	15.02.2008	2634	2691
  31/1-2 A	29.01.2021	3761	3859
  31/1-2 S	12.01.2021	3364	3446
  31/2-1	09.11.1979	1985	2093
  31/2-1 R	09.11.1981	1986	2094
  31/2-2 R	06.10.1980	2070	2162
  31/2-3	20.07.1980	1902	2010
  31/2-4 R	06.04.1981	1902	2008
  31/2-4 R2	12.11.1982	1902	2008
  31/2-5	21.12.1980	2070	2201
  31/2-5 R	20.07.1981	2063	2194
  31/2-5 R2	22.04.1984	2063	2194
  31/2-8	18.08.1982	2720	2825
  31/2-19 S	13.07.1996	3632	3749
  31/2-21 S	04.06.2014	3074	3123
  31/3-1	13.10.1983	1844	1945
  31/3-2	30.04.1984	2006	2090
  31/3-3	18.11.1984	2209	2293
  31/4-2	15.11.1979	2354	2479
  31/4-3	11.05.1980	2411	2448
  31/4-5	29.07.1981	2356	2482
  31/4-6	20.04.1982	2380	2447
  31/4-7	11.09.1984	2102	2236
  31/4-8	11.05.1986	2117	2222
  31/4-9	07.03.1987	2411	2480
  31/4-11	12.09.2000	2785	2957
  31/4-A-13 C	26.07.2022	7225	7426
  31/5-2	11.11.1983	2036	2176
  31/5-2 R	30.08.1984	2036	2176
  31/5-3	09.06.1984	2103	2250
  31/5-6	25.07.2000	2336	2370
  31/5-7	06.03.2020	2510	2638
  31/6-1	28.10.1983	1835	1962
  31/6-2	11.12.1983	1975	2020
  31/6-2 R	08.09.1984	1975	2055
  31/6-3	26.12.1983	1974	2042
  31/6-5	21.05.1984	2035	2082
  31/6-6	29.07.1984	2045	2122
  31/6-8	25.05.1985	2008	2025
  31/6-8 R	22.09.1985	2008	2025
  31/7-1	22.06.2016	2449	2598
  31/11-1 S	28.06.2021	2827	2898
  32/4-1	04.12.1996	1680	1733
  32/4-3 S	26.10.2019	1669	1746
  33/5-2	18.11.1981	4276	4340
  33/6-1	06.07.1979	3647	3697
  33/6-2	02.01.1997	3777	3815
  33/6-5 S	16.10.2021	3479	3515
  33/9-1	04.06.1974	2668	2715
  33/9-3	14.11.1974	2599	2644
  33/9-6	31.08.1976	3140	3200
  33/9-9	17.11.1977	2504	2528
  33/9-10	12.06.1978	3416	3500
  33/9-11	28.08.1978	3276	3437
  33/9-12	03.08.1987	2561	2609
  33/9-13 S	24.12.1987	2815	2855
  33/9-14	09.04.1988	2949	2982
  33/9-19 A	09.08.1996	3070	3171
  33/9-19 A	09.08.1996	3319	3514
  33/9-19 S	23.07.1996	2845	2939
  33/12-4	17.07.1975	2701	2776
  33/12-6	21.06.1976	3285	3397
  33/12-7	27.04.1989	3306	3387
  33/12-8 S	26.04.2002	3167	3285
  33/12-9 S	08.01.2012	3775	3812
  34/2-2 R	08.05.1981	3520	3619
  34/2-4	11.06.1985	3615	3821
  34/3-1 A	30.10.2008	3782	3954
  34/3-1 S	10.09.2008	3777	3866
  34/3-2 S	30.12.2009	3857	4012
  34/3-3 A	03.01.2012	4743	4809
  34/3-3 S	19.11.2011	3748	3908
  34/3-4 A	13.02.2015	4246	4370
  34/3-5	16.04.2015	4032	4140
  34/4-3	30.03.1982	4169	4226
  34/4-5	06.04.1984	3266	3416
  34/4-10 R	18.04.2000	4040	4066
  34/4-14 S	19.05.2015	4417	4494
  34/4-15 A	12.08.2020	3802	3844
  34/4-15 S	15.07.2020	3523	3570
  34/4-16 S	31.03.2021	3553	3603
  34/4-18 S	06.03.2022	2818	2855
  34/5-1 A	10.04.2010	4152	4274
  34/5-1 S	13.03.2010	3553	3629
  34/5-2 S	04.07.2018	3499	3588
  34/6-1 S	28.08.2002	3659	3807
  34/6-2 A	12.12.2012	3547	3702
  34/6-2 S	05.11.2012	3566	3654
  34/6-3 A	01.11.2014	3544	3603
  34/6-3 S	24.09.2014	3793	3851
  34/6-4	02.03.2016	3838	3952
  34/6-5 S	08.06.2021	3529	3654
  34/7-5	16.03.1985	2622	2696
  34/7-12	17.12.1987	2341	2462
  34/7-13	13.04.1988	2600	2670
  34/7-14	02.12.1989	2413	2543
  34/7-15 S	03.09.1990	4571	4646
  34/7-16	13.08.1990	2514	2603
  34/7-16 R	15.10.1990	2515	2604
  34/7-16 R2	05.07.1994	2514	2603
  34/7-17	07.04.1991	2697	2789
  34/7-18	17.09.1991	2399	2443
  34/7-19	27.12.1991	2658	2740
  34/7-19 R	12.07.1994	2665	2747
  34/7-20	27.08.1992	2785	2882
  34/7-21	11.12.1992	2972	3015
  34/7-22	01.10.1993	2460	2507
  34/7-25 S	14.09.1996	3183	3235
  34/7-27	07.10.1998	2930	3000
  34/7-28	02.03.1998	2972	3005
  34/7-32	27.10.2001	2636	2651
  34/7-33	15.10.2008	2587	2615
  34/8-1	08.03.1986	2981	3044
  34/8-2	17.11.1986	2913	2923
  34/8-3	14.09.1988	2965	3007
  34/8-3 A	31.10.1988	3184	3227
  34/8-4 S	09.06.1991	2924	2938
  34/8-5	01.04.1991	3049	3122
  34/8-6	03.11.1991	3880	3950
  34/8-7	16.07.1992	4767	4808
  34/8-7 R	10.02.1993	4767	4808
  34/8-8	24.08.1992	3077	3123
  34/8-8 R	09.03.1993	3077	3122
  34/8-9 S	28.12.1992	2984	3009
  34/8-10 S	09.12.1993	2885	2888
  34/8-11	08.02.1994	3011	3072
  34/8-13 A	13.05.2009	3466	3495
  34/8-13 S	26.06.2009	3953	3972
  34/8-14 A	01.12.2008	3720	3838
  34/8-14 D	10.02.2009	3797	3850
  34/8-14 S	21.10.2008	3411	3470
  34/8-15 S	19.02.2013	3649	3690
  34/8-17 S	14.03.2014	4069	4098
  34/8-19 S	20.06.2018	3199	3671
  34/8-19 S	20.06.2018	3943	3986
  34/8-19 S	20.06.2018	5472	5582
  34/8-19 S	20.06.2018	5672	5738
  34/10-1	08.09.1978	1946	2023
  34/10-2	08.12.1978	3124	3172
  34/10-3	07.06.1979	2092	2201
  34/10-3 R	10.10.1987	2089	2198
  34/10-4	15.10.1979	1916	2025
  34/10-5	02.01.1980	2148	2240
  34/10-6	22.01.1980	2290	2363
  34/10-8	25.05.1980	2054	2133
  34/10-9	09.05.1980	1957	2083
  34/10-9 R	03.07.1980	1957	2083
  34/10-12	12.09.1981	2250	2350
  34/10-14	19.03.1982	2080	2159
  34/10-15	12.12.1982	1827	1870
  34/10-16	11.04.1983	3475	3556
  34/10-16 R	27.09.1983	3472	3553
  34/10-17	08.07.1983	3000	3108
  34/10-18	30.08.1983	2604	2688
  34/10-21	22.10.1984	3550	3632
  34/10-23	13.10.1985	4335	4413
  34/10-30	12.05.1986	2945	2950
  34/10-32	13.07.1987	3178	3236
  34/10-32 R	10.08.1987	3178	3236
  34/10-33	15.12.1988	3424	3514
  34/10-33 C	01.08.1989	3722	3752
  34/10-33 CR	27.04.1990	3722	3752
  34/10-34	31.05.1991	2275	2357
  34/10-35	01.07.1992	3942	3965
  34/10-36	13.07.1992	3555	3565
  34/10-37	22.02.1995	2810	2873
  34/10-38 S	29.05.1995	3052	3112
  34/10-39 S	20.06.1995	2814	2900
  34/10-40 S	13.10.1995	5842	5900
  34/10-41 S	28.08.1997	2875	3000
  34/10-42 S	19.09.1999	4403	4485
  34/10-43 S	11.04.2001	3345	3434
  34/10-48 A	15.02.2005	4645	4891
  34/10-48 S	22.12.2004	4645	4891
  34/10-49 B	21.05.2006	2627	2740
  34/10-49 B	21.05.2006	3618	3747
  34/10-49 S	08.05.2006	2627	2740
  34/10-52 A	06.08.2011	3470	3520
  34/10-52 B	22.08.2011	3998	4050
  34/10-53 A	01.06.2011	4822	4855
  34/10-53 S	24.03.2011	3956	4065
  34/10-54 A	18.04.2014	4203	4238
  34/10-54 S	11.02.2014	4117	4177
  34/10-55 S	26.03.2017	7214	7223
  34/11-1	25.10.1994	4221	4289
  34/11-2 S	17.05.1996	4328	4433
  34/11-3	16.01.1997	4197	4261
  34/11-4	14.04.1999	4339	4410
  34/11-5 S	03.07.2006	7370	7380
  34/11-6 S	26.01.2017	7105	7126
  34/12-1	30.04.2008	4499	4607
  35/1-1	18.07.2002	3813	3970
  35/1-2 S	19.12.2010	3638	3923
  35/3-1	26.10.1976	4435	4475
  35/3-2	26.10.1980	3819	3920
  35/3-4	06.06.1981	3800	3963
  35/3-5	31.03.1982	3955	3999
  35/4-1	24.05.1997	4287	4434
  35/4-3	17.05.2022	4427	4614
  35/7-1 S	15.08.2011	4515	4669
  35/8-1	24.01.1981	3744	3831
  35/8-2	21.05.1982	3885	3932
  35/9-2	03.04.1991	2680	2694
  35/9-6 S	07.12.2010	3552	3624
  35/9-9	18.11.2013	3118	3128
  35/9-11 A	21.05.2014	3557	3624
  35/9-11 S	15.04.2014	3558	3624
  35/10-1	16.01.1992	3507	3509
  35/10-2	22.08.1996	4353	4368
  35/10-4 S	10.10.2018	3834	3845
  35/10-7 A	27.12.2021	3561	3584
  35/10-7 S	11.12.2021	3464	3489
  35/11-1	06.08.1984	2583	2648
  35/11-2	04.12.1987	3601	3615
  35/11-3 S	09.09.1989	3640	3693
  35/11-4	29.12.1990	2785	2825
  35/11-4 R	27.01.1992	2795	2835
  35/11-5	03.11.1991	3396	3467
  35/11-6	20.04.1992	3721	3773
  35/11-7	29.09.1992	2584	2592
  35/11-8 S	11.05.1996	3576	3624
  35/11-10	23.06.1997	2801	2818
  35/11-11	22.05.1998	3177	3225
  35/11-17	01.05.2014	2837	2847
  35/11-18	27.09.2015	3695	3711
  35/11-18 A	16.12.2015	3750	3808
  35/11-20 B	15.09.2016	4862	4900
  35/11-21 A	17.10.2018	2874	2897
  35/11-22 S	02.02.2019	3417	3495
  35/11-23	06.11.2019	2894	2911
  35/12-1	24.04.1992	2908	2921
  35/12-4 S	26.06.2011	3255	3324
  6201/11-2	11.03.1991	3668	3697

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  25/5-1	01.08.1987	20
  25/6-1	03.02.1986	13
  29/9-1	24.02.1984	9
  30/2-1	12.10.1982	1
  30/2-2	04.05.1985	0
  30/2-3	05.10.1992	3
  30/3-1 R	26.04.1982	6
  30/3-2 R	16.02.1981	2
  30/3-4	12.06.1985	23
  30/3-7 B	04.08.1998	8
  30/6-1	22.09.1979	28
  30/6-2	11.12.1979	1
  30/6-4	11.05.1981	7
  30/6-6	24.03.1982	4
  30/6-7	24.08.1982	26
  30/6-9	16.12.1982	4
  30/6-10	02.12.1982	15
  30/6-13	14.05.1983	1
  30/6-14	08.02.1984	13
  30/6-16	21.01.1985	37
  30/6-17 A	18.03.1986	7
  30/6-17 R	04.02.1986	18
  30/6-22	13.07.1988	12
  30/6-23	01.07.1990	0
  30/6-30	18.11.2018	47
  30/9-1	29.01.1983	2
  30/9-2	12.07.1983	10
  30/9-9	06.11.1989	9
  30/9-12	09.05.1991	14
  30/9-14	14.05.1993	22
  30/9-15	05.01.1994	27
  30/9-19	22.10.1998	11
  30/11-10	26.12.2014	27
  31/1-2 S	12.01.2021	18
  31/4-7	11.09.1984	44
  33/9-3	14.11.1974	21
  33/9-9	17.11.1977	14
  33/9-12	03.08.1987	5
  33/9-13 S	24.12.1987	13
  33/12-4	17.07.1975	20
  34/4-16 S	31.03.2021	0
  34/7-5	16.03.1985	8
  34/7-12	17.12.1987	16
  34/7-19	27.12.1991	1
  34/8-5	01.04.1991	0
  34/8-8	24.08.1992	6
  34/8-10 S	09.12.1993	3
  34/10-1	08.09.1978	5
  34/10-15	12.12.1982	0
  34/10-30	12.05.1986	1
  34/10-32	13.07.1987	12
  34/10-33	15.12.1988	11
  34/10-35	01.07.1992	9
  34/10-54 S	11.02.2014	10
  35/9-2	03.04.1991	14
  35/9-6 S	07.12.2010	7
  35/10-1	16.01.1992	2
  35/10-7 S	11.12.2021	3
  35/11-18 A	16.12.2015	10
  6201/11-2	11.03.1991	0