Well Data Manager / Well Summary / 21/20b- 4

21/20b- 4

Decommissioned

Well Header

Well No
21/20b- 4
NSTA DEN No
4099
Well Name
--
Drill Seq No
4
Quadrant / Block
21 / 20 b
Surface Location
57.402044, 0.878133
Source Datum
ED50
Subsea Well
Unknown
Platform
--
Slot No
--
Operator
SPIRIT ENERGY NORTH SEA OIL LIMITED
Original Operator
--
Sub Area Operator
SPIRIT ENERGY NORTH SEA OIL LIMITED
Licence No
P421
Licence Type
Production
Spud Date
1990-06-18
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (3)

21/20b- 4 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Oil Well
Dev Type
--
Convention
--
Primary Target
K
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
25.908
Ground Elev (m)
--
Water Depth (m)
119.48
TD MD (m)
2911.450
TD TVDSS (m)
2885.542
TD Datum Depth (m)
25.908
TD Datum Type
Kelly Bushing
Spud Date
1990-06-18
TD Reached
1990-07-16
Completion Date
1990-07-26
Release Date
1994-07-26
21/20b- 4Y Sidetrack Y parent: 21/20b- 4Z
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Oil Well
Dev Type
--
Convention
--
Primary Target
K
Well Seq
WB3
Datum Type
Kelly Bushing
Datum Elev (m)
25.908
Ground Elev (m)
--
Water Depth (m)
119.48
TD MD (m)
4339.742
TD TVDSS (m)
4313.834
TD Datum Depth (m)
25.908
TD Datum Type
Kelly Bushing
Spud Date
1990-09-03
TD Reached
1991-01-12
Completion Date
1991-02-14
Release Date
1995-02-14
21/20b- 4Z Sidetrack Z parent: 21/20b- 4
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Oil Well
Dev Type
--
Convention
--
Primary Target
K
Well Seq
WB2
Datum Type
Kelly Bushing
Datum Elev (m)
25.908
Ground Elev (m)
--
Water Depth (m)
119.48
TD MD (m)
3741.420
TD TVDSS (m)
3715.512
TD Datum Depth (m)
25.908
TD Datum Type
Kelly Bushing
Spud Date
1990-07-26
TD Reached
1990-08-12
Completion Date
1990-09-03
Release Date
1994-09-03

Formation Tops (58)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/20b- 4 Nordland Cenozoic 94.000 68.091 BGS LithoStrat Upper
Nordland Cenozoic 923.000 897.070 BGS LithoStrat Upper
Nordland Cenozoic 1545.000 1519.050 BGS LithoStrat Upper
Nordland Cenozoic 1902.000 1876.045 BGS LithoStrat Upper
Nordland Cenozoic 1920.000 1894.045 BGS LithoStrat Upper
Nordland Cenozoic 2268.000 2241.909 BGS LithoStrat Upper
Nordland Cenozoic 2286.000 2259.857 BGS LithoStrat Upper
Nordland Cenozoic 2429.000 2402.126 BGS LithoStrat Upper
Nordland Cenozoic 2469.000 2441.949 BGS LithoStrat Upper
Nordland Cenozoic 2487.000 2459.869 BGS LithoStrat Upper
Balder Cenozoic 2563.000 2535.506 BGS LithoStrat Upper
Balder Cenozoic 2579.000 2551.428 BGS LithoStrat Upper
Sele Mesozoic 2581.000 2553.418 BGS LithoStrat Upper
Forties Mesozoic 2593.000 2565.361 BGS LithoStrat Upper
Forties Mesozoic 2597.000 2569.341 BGS LithoStrat Upper
Andrew Cenozoic 2751.000 2722.850 BGS LithoStrat Upper
Maureen Mesozoic 2772.000 2743.804 BGS LithoStrat Upper
Maureen Mesozoic 2798.000 2769.763 BGS LithoStrat Upper
Ekofisk Mesozoic 2819.000 2790.742 BGS LithoStrat Upper
Ekofisk Mesozoic 2835.000 2806.729 BGS LithoStrat Upper
Ekofisk Mesozoic 2908.000 2879.678 BGS LithoStrat Upper
Tor Mesozoic 2916.000 2883.126 BGS LithoStrat Upper
Tor Mesozoic 2926.000 2883.126 BGS LithoStrat Upper
Tor Mesozoic 3139.000 2883.126 BGS LithoStrat Upper
Hod Mesozoic 3140.000 2883.126 BGS LithoStrat Upper
Hod Mesozoic 3200.000 2883.126 BGS LithoStrat Upper
Hod Mesozoic 3292.000 2883.126 BGS LithoStrat Upper
Hod Mesozoic 3322.000 2883.126 BGS LithoStrat Upper
Hod Mesozoic 3353.000 2883.126 BGS LithoStrat Upper
Hod Mesozoic 3368.000 2883.126 BGS LithoStrat Upper
Herring Mesozoic 3377.000 2883.126 BGS LithoStrat Upper
Herring Mesozoic 3432.000 2883.126 BGS LithoStrat Upper
Plenus Marl 3437.000 2883.126 BGS LithoStrat Upper
Hidra Mesozoic 3443.000 2883.126 BGS LithoStrat Upper
Upper Valhall B Member 3474.000 2883.126 BGS LithoStrat Upper
Upper Valhall B Member 3475.000 2883.126 BGS LithoStrat Upper
Upper Valhall B Member 3542.000 2883.126 BGS LithoStrat Upper
Upper Valhall A Member 3567.000 2883.126 BGS LithoStrat Upper
Upper Valhall A Member 3578.000 2883.126 BGS LithoStrat Upper
Upper Valhall A Member 3597.000 2883.126 BGS LithoStrat Upper
Upper Valhall A Member 3612.000 2883.126 BGS LithoStrat Upper
Unknown 3615.000 2883.126 BGS LithoStrat Upper
Upper Valhall A Member 3627.000 2883.126 BGS LithoStrat Upper
Lower Valhall C Member 3637.000 2883.126 BGS LithoStrat Upper
Lower Valhall C Member 3652.000 2883.126 BGS LithoStrat Upper
Lower Valhall C Member 3658.000 2883.126 BGS LithoStrat Upper
Lower Valhall C Member 3688.000 2883.126 BGS LithoStrat Upper
Lower Valhall B Member 3744.000 2883.126 BGS LithoStrat Upper
Lower Valhall B Member 3780.000 2883.126 BGS LithoStrat Upper
Lower Valhall B Member 3840.000 2883.126 BGS LithoStrat Upper
Lower Valhall B Member 3901.000 2883.126 BGS LithoStrat Upper
Lower Valhall B Member 3908.000 2883.126 BGS LithoStrat Upper
Lower Valhall A Member 3920.000 2883.126 BGS LithoStrat Upper
Kimmeridge Clay 3937.000 2883.126 BGS LithoStrat Upper
Kimmeridge Sands Mesozoic 4116.000 2883.126 BGS LithoStrat Upper
Heather Mesozoic 4158.000 2883.126 BGS LithoStrat Upper
Fulmar Sandstone 4209.000 2883.126 BGS LithoStrat Upper
Humber Mesozoic 4252.000 2883.126 BGS LithoStrat Upper

Lithology Intervals

21/20b- 4Y Curve: SANDCOUNT 60 intervals  ·  MD 2400.300 – 4241.597 m G:/NSTA_BigFiles/NSTA_Packages/Lloyds_Register/NSTA Centr...
Sandstone (46)
Limestone (14)
21/20b- 4Z Curve: SANDCOUNT 31 intervals  ·  MD 2400.300 – 3675.431 m G:/NSTA_BigFiles/NSTA_Packages/Lloyds_Register/NSTA Centr...
Sandstone (29)
Limestone (2)

Interpreted Data Inventory (LR / WellStrat)

Open Interpreted Data Log
Wellbore Groups Formations Members Strat Intervals Tops HC Occ Core Cuttings DSTs
21/20b- 4 0 0 0 58 58 0 1 1 0 View
21/20b- 4Y 6 11 4 0 0 1 0 0 1 View
21/20b- 4Z 0 0 0 0 0 0 0 0 0 View

Hydrocarbon Occurrence (2)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/20b- 4 Oil shows OS KMS 4116.019200000001 -- 42 m thick
21/20b- 4Y DST DST 1 -- 4117.8 4151.4 Label / Upper Jurassic

Rock Samples (34)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/20b- 4 Cuttings 941.83 4339.74 -- -- .
21/20b- 4 Core #1 4233.06 4242.48 φ 13.9% (n=32) · Kh 0.1 mD (n=32) · Kv 0.0 mD (n=4) · So 29.5% (n=32) · Sw 29.9% (n=2) · Density 2.69 (n=32) NF | SST DK GY VF-F LAM BIOT FE STG; SST DK GY VF-F SLTY LAM; SST F SL FE STG; SST GY F DEF LAM; SST GY F DEF LAM BIOT; SST GY F DEF SLTY LAM BIOT; SST GY F FE STG; SST GY F FNT LAM; SST GY F LAM; SST GY F LAM BIOT; SST GY F LAM BIOT PY; SST GY F LAM BIOT R FE STG; SST GY F LAM CARB SL BIOT; SST GY F LAM SL BIOT; SST GY F PY FE STG; SST GY F R DEF SLTY LAM; SST GY F R FE STG; SST GY F R LAM BIOT; SST GY F R LAM BIOT R PY; SST GY F R SLTY LAM BIOT; SST GY F-M R PY/FE STG; SST GY VF-F R SLTY LAM; SST GY/BRN F FE STG; SST GY/BRN F LAM FE STG BIOT --
21/20b- 4 ↳ Plug 01 4233.062 -- φ 14.4% · Kh 0.0 mD · Kv 0.0 mD · So 31.6% · Density 2.70 NF | SST GY F LAM CARB SL BIOT --
21/20b- 4 ↳ Plug 02 4233.367 -- φ 15.6% · Kh 0.1 mD · So 32.3% · Density 2.69 SST GY F LAM CARB SL BIOT --
21/20b- 4 ↳ Plug 03 4233.672 -- φ 11.5% · Kh 0.1 mD · So 32.0% · Density 2.69 SST GY F PY FE STG --
21/20b- 4 ↳ Plug 04 4233.977 -- φ 16.6% · Kh 0.2 mD · So 21.9% · Density 2.67 SST GY F FE STG --
21/20b- 4 ↳ Plug 05 4234.282 -- φ 16.9% · Kh 0.2 mD · So 24.1% · Density 2.68 SST GY/BRN F FE STG --
21/20b- 4 ↳ Plug 06 4234.586 -- φ 16.9% · Kh 0.1 mD · So 29.4% · Density 2.70 SST GY F LAM SL BIOT --
21/20b- 4 ↳ Plug 07 4234.891 -- φ 10.6% · Kh 0.1 mD · So 28.0% · Density 2.70 SST GY/BRN F LAM FE STG BIOT --
21/20b- 4 ↳ Plug 08 4235.196 -- φ 12.0% · Kh 0.1 mD · So 30.3% · Density 2.70 SST GY/BRN F LAM FE STG BIOT --
21/20b- 4 ↳ Plug 09 4235.501 -- φ 15.2% · Kh 0.1 mD · So 30.6% · Density 2.69 SST GY/BRN F LAM FE STG BIOT --
21/20b- 4 ↳ Plug 10 4235.806 -- φ 15.8% · Kh 0.1 mD · So 31.1% · Density 2.69 SST GY F R LAM BIOT --
21/20b- 4 ↳ Plug 11 4236.11 -- φ 14.8% · Kh 0.6 mD · Kv 0.0 mD · So 24.4% · Density 2.69 NF | SST GY F R LAM BIOT --
21/20b- 4 ↳ Plug 12 4236.415 -- φ 11.9% · Kh 0.1 mD · So 30.1% · Density 2.71 SST GY F R LAM BIOT R PY --
21/20b- 4 ↳ Plug 13 4236.72 -- φ 11.4% · Kh 0.1 mD · So 29.5% · Density 2.67 SST DK GY VF-F LAM BIOT FE STG --
21/20b- 4 ↳ Plug 14 4237.025 -- φ 14.0% · Kh 0.1 mD · So 29.8% · Density 2.70 SST GY F LAM BIOT R FE STG --
21/20b- 4 ↳ Plug 15 4237.33 -- φ 15.6% · Kh 0.1 mD · So 30.3% · Density 2.68 SST GY F R FE STG --
21/20b- 4 ↳ Plug 16 4237.634 -- φ 6.9% · Kh 0.0 mD · So 29.9% · Density 2.76 SST F SL FE STG --
21/20b- 4 ↳ Plug 17 4237.939 -- φ 13.5% · Kh 0.1 mD · So 29.8% · Sw 29.8% · Density 2.69 SST GY F DEF SLTY LAM BIOT --
21/20b- 4 ↳ Plug 18 4238.244 -- φ 13.2% · Kh 0.1 mD · So 30.3% · Density 2.71 SST GY VF-F R SLTY LAM --
21/20b- 4 ↳ Plug 19 4238.549 -- φ 11.3% · Kh 0.1 mD · So 30.8% · Density 2.71 SST DK GY VF-F SLTY LAM --
21/20b- 4 ↳ Plug 20 4238.854 -- φ 14.2% · Kh 0.1 mD · So 30.1% · Density 2.69 SST GY F R SLTY LAM BIOT --
21/20b- 4 ↳ Plug 21 4239.158 -- φ 16.0% · Kh 0.1 mD · Kv 0.1 mD · So 29.8% · Density 2.69 SST GY F R DEF SLTY LAM --
21/20b- 4 ↳ Plug 22 4239.463 -- φ 16.1% · Kh 0.1 mD · So 30.2% · Density 2.70 SST GY F-M R PY/FE STG --
21/20b- 4 ↳ Plug 23 4239.768 -- φ 16.5% · Kh 0.1 mD · So 29.9% · Density 2.69 SST GY F-M R PY/FE STG --
21/20b- 4 ↳ Plug 24 4240.073 -- φ 16.2% · Kh 0.1 mD · So 29.2% · Density 2.69 SST GY F FNT LAM --
21/20b- 4 ↳ Plug 25 4240.378 -- φ 15.7% · Kh 0.1 mD · So 29.3% · Density 2.69 SST GY F LAM --
21/20b- 4 ↳ Plug 26 4240.682 -- φ 9.1% · Kh 0.1 mD · So 29.1% · Density 2.71 SST DK GY VF-F LAM BIOT FE STG --
21/20b- 4 ↳ Plug 27 4240.987 -- φ 12.5% · Kh 0.1 mD · So 28.9% · Density 2.70 SST GY F LAM BIOT --
21/20b- 4 ↳ Plug 28 4241.292 -- φ 13.5% · Kh 0.1 mD · So 29.7% · Density 2.70 SST GY F LAM BIOT PY --
21/20b- 4 ↳ Plug 29 4241.597 -- φ 11.5% · Kh 0.1 mD · So 31.2% · Density 2.69 SST GY F LAM BIOT --
21/20b- 4 ↳ Plug 30 4241.902 -- φ 16.0% · Kh 0.1 mD · So 30.0% · Density 2.69 SST GY F DEF LAM --
21/20b- 4 ↳ Plug 31 4242.206 -- φ 14.2% · Kh 0.1 mD · Kv 0.1 mD · So 30.0% · Sw 30.1% · Density 2.68 SST GY F DEF LAM BIOT --
21/20b- 4 ↳ Plug 32 4242.42 -- φ 14.7% · Kh 0.1 mD · So 29.7% · Density 2.69 SST GY F DEF LAM BIOT --

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/20b- 4 101.8031997680664 2391.61328125 10 0 2026-08-06 10:18:54.467623+00 View Log
21/20b- 4Y 2738.4755859375 4258.20849609375 10 0 2026-08-06 10:18:59.47813+00 View Log
21/20b- 4Z 2362.3525390625 3744.315673828125 6 0 2026-08-06 10:19:02.648667+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/20b- 4
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density RHOB CGG Digital Well Logs 924.4584000000001 2385.9744 9591
caliper CALI CGG Digital Well Logs 923.2392000000001 2385.822 9598
caliper CALS CGG Digital Well Logs 923.2392000000001 2377.2876 9542
comp_sonic DT CGG Digital Well Logs 928.5732 2385.822 9563
deep_resistivity LLD CGG Digital Well Logs 926.5920000000001 2391.4608000000003 9613
density_correction DRHO CGG Digital Well Logs 924.6108 2385.822 9589
gamma_ray GR CGG Digital Well Logs 101.8032 2376.5256 14927
gamma_ray GRD CGG Digital Well Logs 915.4668 2376.5256 9588
micro_resistivity MSFL CGG Digital Well Logs 927.8112000000001 2378.5068 9520
neutron_por NPHI CGG Digital Well Logs 924.306 2379.726 9551
shallow_resistivity LLS CGG Digital Well Logs 926.2872000000001 2391.6132000000002 9616
sp SP CGG Digital Well Logs 925.83 2364.7908 9443
21/20b- 4Y
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density RHOB CGG Digital Well Logs 3938.1684 4257.294 2095
caliper CALI CGG Digital Well Logs 3937.4064000000003 4257.1416 1762
caliper CALS CGG Digital Well Logs 3937.4064000000003 4252.1124 2066
comp_sonic DT CGG Digital Well Logs 3654.3996 4245.102 3801
deep_resistivity LLD CGG Digital Well Logs 3654.3996 4258.2084 3927
density_correction DRHO CGG Digital Well Logs 3938.3208000000004 4257.294 2094
gamma_ray GR CGG Digital Well Logs 2738.4756 4250.436000000001 9922
gamma_ray GRD CGG Digital Well Logs 3926.7384 4250.436000000001 2125
micro_resistivity MSFL CGG Digital Well Logs 3938.1684 4252.1124 1798
neutron_por NPHI CGG Digital Well Logs 3938.3208000000004 4252.5696 2063
shallow_resistivity LLS CGG Digital Well Logs 3654.3996 4258.0560000000005 3926
sp SP CGG Digital Well Logs 3938.6256000000003 4231.2336000000005 1921
21/20b- 4Z
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density RHOB CGG Digital Well Logs 2403.5004 3744.3156000000004 8799
caliper CALI CGG Digital Well Logs 2402.5860000000002 3744.3156000000004 8805
comp_sonic DT CGG Digital Well Logs 2403.8052000000002 3732.4284000000002 8719
density_correction DRHO CGG Digital Well Logs 2403.348 3744.3156000000004 8800
gamma_ray GR CGG Digital Well Logs 2362.3524 3734.2572 9003
neutron_por NPHI CGG Digital Well Logs 2403.0432 3738.2196000000004 8762

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/20b- 4 99 2911.450 2883.126 D:\BigSpatial\nsta_raw\CGG_Deviation\21-20b-4 10910bs-CGG_Deviation.xlsx
21/20b- 4Y 147 4375.400 4342.771 D:\BigSpatial\nsta_raw\CGG_Deviation\21-20b-4Y 12575fd-CGG_Deviation.xlsx
21/20b- 4Z 0 -- -- --

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