21/15b- 4

Decommissioned

Well Header

Well No
21/15b- 4
NSTA DEN No
2487
Well Name
--
Drill Seq No
4
Quadrant / Block
21 / 15 b
Surface Location
57.627076, 0.811325
Source Datum
ED50
Subsea Well
No
Platform
--
Slot No
--
Operator
ENTERPRISE OIL LIMITED
Original Operator
--
Sub Area Operator
ENTERPRISE OIL LIMITED
Licence No
P420
Licence Type
Production
Spud Date
1984-09-08
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (2)

21/15b- 4 Original
Abandoned Phase 3 View Log Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Oil and Gas Shows
Dev Type
--
Convention
--
Primary Target
A
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
24.994
Ground Elev (m)
--
Water Depth (m)
118.87
TD MD (m)
3899.306
TD TVDSS (m)
0.000
TD Datum Depth (m)
24.994
TD Datum Type
Kelly Bushing
Spud Date
1984-09-08
TD Reached
1984-09-17
Completion Date
1984-09-20
Release Date
1988-09-20
21/15b- 4A Sidetrack A parent: 21/15b- 4
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Oil and Gas Shows
Dev Type
--
Convention
--
Primary Target
A
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
25.908
Ground Elev (m)
--
Water Depth (m)
117.35
TD MD (m)
3924.300
TD TVDSS (m)
0.000
TD Datum Depth (m)
25.908
TD Datum Type
Kelly Bushing
Spud Date
1984-09-20
TD Reached
1984-11-19
Completion Date
1984-12-09
Release Date
1988-12-09

Formation Tops (0)

No formation tops ingested for this well.

Lithology Intervals

21/15b- 4A Curve: SANDCOUNT 103 intervals  ·  MD 879.196 – 3932.225 m G:/NSTA_BigFiles/NSTA_Packages/Lloyds_Register/NSTA Centr...
Limestone (59)
Sandstone (43)
Coal (1)

Interpreted Data Inventory (LR / WellStrat)

Open Interpreted Data Log
Wellbore Groups Formations Members Strat Intervals Tops HC Occ Core Cuttings DSTs
21/15b- 4 0 0 0 0 0 0 0 0 0
21/15b- 4A 8 14 6 49 0 3 2 0 1 View

Hydrocarbon Occurrence (2)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/15b- 4A Oil shows OS Forties Sandstone Member 2306.4216 -- 269 m thick
21/15b- 4A DST DST 1 -- 3883.2 3916.7 Label / Upper Jurassic

Rock Samples (91)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/15b- 4A Core #1 3903.88 3929.05 φ 15.3% (n=81) · Kh 2.4 mD (n=76) · Kv 1.5 mD (n=8) · So 10.2% (n=51) · Sw 46.6% (n=51) · Density 2.69 (n=81) · FSP 14.2 (n=51) · REDWOOD COREX DAMAGED; FRACTURED; PRESERVED SAMPLE .
21/15b- 4A ↳ Plug GGA 1 3903.909 -- φ 1.5% · Kh 0.0 mD · Kv 0.0 mD · So 0.0% · Sw 54.6% · Density 2.75 · FSP 3.7 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 2 3904.183 -- φ 1.3% · Kh 0.0 mD · So 9.8% · Sw 49.1% · Density 2.75 · FSP 2.2 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 3 3904.488 -- φ 0.7% · Kh 0.0 mD · So 6.5% · Sw 72.0% · Density 2.76 · FSP 3.4 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 4 3904.793 -- φ 9.8% · So 18.6% · Sw 39.4% · Density 2.67 · FSP 17.3 · REDWOOD COREX DAMAGED --
21/15b- 4A ↳ Plug GGA 5 3905.098 -- φ 25.2% · Kh 34.8 mD · So 16.7% · Sw 32.4% · Density 2.66 · FSP 19.1 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 6 3905.402 -- φ 21.3% · Kh 44.7 mD · So 14.1% · Sw 34.1% · Density 2.66 · FSP 17.9 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 7 3905.707 -- φ 19.9% · Kh 8.2 mD · So 13.2% · Sw 48.9% · Density 2.66 · FSP 19.2 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 8 3906.012 -- φ 17.9% · Kh 4.9 mD · So 19.2% · Sw 50.2% · Density 2.67 · FSP 17.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 9 3906.332 -- φ 18.4% · Kh 3.9 mD · So 11.6% · Sw 57.0% · Density 2.66 · FSP 16.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 10 3906.622 -- φ 23.3% · Kh 9.0 mD · So 19.7% · Sw 44.4% · Density 2.65 · FSP 18.9 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 11 3906.926 -- φ 20.3% · Kh 7.8 mD · Kv 9.1 mD · So 11.7% · Sw 43.1% · Density 2.66 · FSP 20.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 12 3907.231 -- φ 20.1% · Kh 9.4 mD · So 14.1% · Sw 39.4% · Density 2.66 · FSP 19.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 13 3907.536 -- φ 19.4% · Kh 4.2 mD · So 14.5% · Sw 40.6% · Density 2.67 · FSP 18.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 14 3907.841 -- φ 19.7% · Kh 3.2 mD · So 10.7% · Sw 30.9% · Density 2.67 · FSP 15.2 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 15 3908.146 -- φ 20.1% · Kh 2.5 mD · So 12.0% · Sw 44.5% · Density 2.69 · FSP 15.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 16 3908.45 -- φ 19.2% · Kh 1.6 mD · So 10.8% · Sw 44.5% · Density 2.70 · FSP 15.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 17 3908.755 -- φ 18.1% · Kh 0.6 mD · So 12.2% · Sw 42.1% · Density 2.72 · FSP 16.5 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 18 3909.06 -- φ 18.5% · Kh 4.0 mD · So 12.4% · Sw 37.2% · Density 2.69 · FSP 14.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 19 3909.365 -- φ 15.6% · Kh 0.7 mD · So 8.7% · Sw 47.3% · Density 2.67 · FSP 14.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 20 3909.67 -- φ 18.1% · Kh 1.8 mD · So 12.3% · Sw 41.5% · Density 2.66 · FSP 16.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 21 3909.974 -- φ 18.4% · Kh 1.7 mD · Kv 1.2 mD · So 10.8% · Sw 38.4% · Density 2.66 · FSP 12.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 22 3910.279 -- φ 18.0% · Kh 2.2 mD · So 8.5% · Sw 53.0% · Density 2.66 · FSP 17.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 23 3910.584 -- φ 17.6% · Kh 1.1 mD · So 14.5% · Sw 50.2% · Density 2.67 · FSP 20.7 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 24 3910.889 -- REDWOOD COREX PRESERVED SAMPLE --
21/15b- 4A ↳ Plug GGA 25 3911.194 -- φ 18.6% · Kh 1.1 mD · So 12.8% · Sw 42.7% · Density 2.66 · FSP 19.1 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 26 3911.498 -- φ 18.9% · Kh 1.4 mD · So 11.0% · Sw 27.5% · Density 2.66 · FSP 17.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 27 3911.803 -- φ 15.8% · Kh 0.3 mD · So 7.7% · Sw 50.9% · Density 2.69 · FSP 17.7 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 28 3912.138 -- φ 12.5% · Kh 0.1 mD · So 9.1% · Sw 61.0% · Density 2.76 · FSP 12.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 29 3912.413 -- REDWOOD COREX PRESERVED SAMPLE --
21/15b- 4A ↳ Plug GGA 30 3912.718 -- φ 12.8% · Kh 0.7 mD · So 6.4% · Sw 41.7% · Density 2.68 · FSP 17.7 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 31 3913.022 -- φ 17.5% · Kh 1.2 mD · Kv 1.0 mD · So 5.7% · Sw 54.8% · Density 2.67 · FSP 16.8 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 32 3913.327 -- φ 17.3% · Kh 1.1 mD · So 6.1% · Sw 21.3% · Density 2.67 · FSP 12.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 33 3913.632 -- φ 17.1% · Kh 4.9 mD · So 8.2% · Sw 45.3% · Density 2.66 · FSP 13.7 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 34 3913.967 -- φ 16.1% · Kh 1.2 mD · So 11.3% · Sw 43.9% · Density 2.65 · FSP 15.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 35 3914.303 -- φ 16.7% · So 8.4% · Sw 45.6% · Density 2.66 · FSP 15.7 · REDWOOD COREX FRACTURED --
21/15b- 4A ↳ Plug GGA 36 3914.546 -- φ 16.6% · Kh 0.9 mD · So 4.0% · Sw 50.1% · Density 2.68 · FSP 14.2 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 37 3914.851 -- φ 15.7% · Kh 2.4 mD · So 4.2% · Sw 43.7% · Density 2.65 · FSP 13.1 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 38 3915.156 -- φ 17.1% · Kh 0.6 mD · So 5.8% · Sw 52.4% · Density 2.66 · FSP 15.9 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 39 3915.461 -- φ 15.4% · Kh 0.4 mD · Density 2.65 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 40 3915.766 -- φ 15.5% · Kh 0.2 mD · Density 2.68 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 41 3916.07 -- φ 16.2% · Kv 0.4 mD · So 6.3% · Sw 46.2% · Density 2.66 · FSP 17.3 · REDWOOD COREX DAMAGED --
21/15b- 4A ↳ Plug GGA 42 3916.375 -- φ 16.4% · Kh 0.3 mD · Density 2.68 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 43 3916.68 -- φ 11.8% · Kh 0.2 mD · Density 2.66 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 44 3916.985 -- φ 8.9% · Kh 0.2 mD · So 4.2% · Sw 55.7% · Density 2.68 · FSP 13.8 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 45 3917.29 -- φ 14.4% · Kh 0.1 mD · Density 2.66 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 46 3917.64 -- φ 13.0% · Kh 0.1 mD · Density 2.65 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 47 3917.899 -- φ 14.3% · Kh 0.9 mD · So 6.7% · Sw 56.3% · Density 2.69 · FSP 14.5 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 48 3918.204 -- φ 15.2% · Kh 0.3 mD · Density 2.67 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 49 3918.509 -- φ 16.0% · Kh 0.2 mD · Density 2.67 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 50 3918.783 -- φ 17.5% · Kh 0.6 mD · So 7.7% · Sw 51.7% · Density 2.68 · FSP 17.5 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 51 3919.118 -- φ 16.9% · Kh 1.1 mD · Kv 0.6 mD · Density 2.67 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 52 3919.423 -- φ 17.4% · Kh 0.4 mD · Density 2.68 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 53 3919.758 -- φ 17.4% · Kh 0.4 mD · So 5.8% · Sw 55.4% · Density 2.68 · FSP 16.3 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 54 3920.033 -- φ 16.0% · Kh 0.2 mD · Density 2.72 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 55 3920.338 -- φ 17.2% · Kh 0.2 mD · Density 2.70 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 56 3920.642 -- φ 16.6% · Kh 0.1 mD · So 13.1% · Sw 65.3% · Density 2.69 · FSP 11.9 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 57 3920.947 -- φ 15.5% · Kh 0.3 mD · Density 2.68 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 58 3921.252 -- φ 15.2% · Kh 0.1 mD · Density 2.71 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 59 3921.557 -- φ 14.8% · Kh 0.1 mD · So 5.8% · Sw 67.2% · Density 2.71 · FSP 13.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 60 3921.862 -- φ 13.8% · Kh 0.1 mD · Density 2.74 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 61 3922.166 -- φ 13.8% · Kh 0.3 mD · Kv 0.0 mD · Density 2.74 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 62 3922.471 -- φ 15.7% · Kh 0.1 mD · So 9.6% · Sw 61.7% · Density 2.68 · FSP 14.2 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 63 3922.776 -- φ 14.1% · Kh 0.1 mD · Density 2.71 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 64 3923.081 -- φ 12.8% · Kh 0.1 mD · Density 2.71 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 65 3923.386 -- φ 7.0% · Kh 0.1 mD · So 8.9% · Sw 62.1% · Density 2.76 · FSP 4.8 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 66 3923.69 -- φ 5.3% · Kh 1.1 mD · Density 2.73 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 67 3923.995 -- φ 9.1% · Kh 0.1 mD · Density 2.79 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 68 3924.3 -- φ 10.3% · Kh 0.9 mD · So 26.2% · Sw 52.4% · Density 2.75 · FSP 3.2 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 69 3924.605 -- φ 14.1% · Kh 0.1 mD · Density 2.71 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 70 3924.91 -- φ 14.0% · Kh 0.1 mD · Density 2.72 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 71 3925.214 -- φ 14.6% · Kh 1.9 mD · Kv 0.1 mD · So 10.0% · Sw 27.4% · Density 2.70 · FSP 7.6 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 72 3925.519 -- φ 16.1% · Kh 0.2 mD · Density 2.68 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 73 3925.824 -- φ 16.0% · Kh 0.2 mD · Density 2.67 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 74 3926.129 -- φ 16.1% · Kh 0.4 mD · So 8.3% · Sw 24.9% · Density 2.67 · FSP 9.1 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 75 3926.434 -- φ 15.6% · Kh 0.1 mD · Density 2.66 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 76 3926.738 -- φ 16.4% · Kh 0.1 mD · Density 2.69 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 77 3927.043 -- φ 15.1% · Kh 0.1 mD · So 6.0% · Sw 35.9% · Density 2.68 · FSP 9.7 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 78 3927.348 -- φ 13.9% · Kh 0.1 mD · Density 2.68 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 79 3927.653 -- φ 12.8% · Kh 8.3 mD · Density 2.77 · REDWOOD COREX -- --
21/15b- 4A ↳ Plug GGA 80 3927.958 -- φ 10.9% · So 6.0% · Sw 35.9% · Density 2.75 · FSP 9.7 · REDWOOD COREX FRACTURED --
21/15b- 4A ↳ Plug GGA 81 3928.262 -- φ 15.4% · Kh 0.3 mD · Density 2.75 · REDWOOD COREX FRACTURED --
21/15b- 4A ↳ Plug GGA 82 3928.567 -- φ 13.7% · Density 2.73 · REDWOOD COREX DAMAGED --
21/15b- 4A ↳ Plug GGA 83 3928.902 -- φ 14.1% · Kh 0.1 mD · So 13.0% · Sw 62.9% · Density 2.65 · FSP 8.9 · REDWOOD COREX -- --
21/15b- 4A Core #2 3931.31 3939.78 φ 7.1% (n=2) · Kh 0.0 mD (n=1) · Density 3.19 (n=2) · REDWOOD COREX FRACTURED - NPP -No Fluid Analysis; No Fluid Analysis; SHALE NO ANALYSIS | PYRITE .
21/15b- 4A ↳ Core Plug #2 3931.31 -- REDWOOD COREX SHALE NO ANALYSIS --
21/15b- 4A ↳ Core Plug #2 3937.711 -- REDWOOD COREX SHALE NO ANALYSIS --
21/15b- 4A ↳ Plug GGB 23 3938.077 -- φ 11.8% · Density 3.05 · REDWOOD COREX FRACTURED - NPP -No Fluid Analysis | PYRITE --
21/15b- 4A ↳ Core Plug #2 3938.354 -- REDWOOD COREX SHALE NO ANALYSIS --
21/15b- 4A ↳ Core Plug #2 3939.235 -- REDWOOD COREX SHALE NO ANALYSIS --
21/15b- 4A ↳ Plug GGB 28 3939.54 -- φ 2.4% · Kh 0.0 mD · Density 3.34 · REDWOOD COREX No Fluid Analysis | PYRITE --

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/15b- 4 0.15240000188350677 3955.084716796875 8 0 2026-08-06 17:24:37.505577+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/15b- 4
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density DEN CGG Digital Well Logs 2186.94 3955.0848 11603
caliper CAL CGG Digital Well Logs 2186.6352 3954.9324 11604
comp_sonic AC CGG Digital Well Logs 673.9128000000001 3947.4648 21481
deep_resistivity RILD CGG Digital Well Logs 673.9128000000001 3954.3228000000004 21526
density_correction CORR CGG Digital Well Logs 2187.2448 3954.9324 11600
gamma_ray GR CGG Digital Well Logs 0.1524 3943.8072 25878
gamma_ray GRD CGG Digital Well Logs 1921.6116000000002 3951.4272 13320
med_resistivity RILM CGG Digital Well Logs 673.7604 3954.3228000000004 21527
neutron_por CN CGG Digital Well Logs 2186.7876 3952.6464 11588
potassium K CGG Digital Well Logs 2191.9692 2803.5504 4014
thorium TH CGG Digital Well Logs 2191.9692 2803.5504 4014

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/15b- 4 0 -- -- --
21/15b- 4A 13 3950.208 3923.803 D:\BigSpatial\nsta_raw\CGG_Deviation\21-15b-4 1048ag-CGG_Deviation.xls

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