Well Data Manager / Well Summary / 21/14a- 4

21/14a- 4

Decommissioned

Well Header

Well No
21/14a- 4
NSTA DEN No
4364
Well Name
--
Drill Seq No
4
Quadrant / Block
21 / 14 a
Surface Location
57.584774, 0.769767
Source Datum
ED50
Subsea Well
Unknown
Platform
--
Slot No
--
Operator
CHEVRON BRITAIN LIMITED
Original Operator
--
Sub Area Operator
CHEVRON BRITAIN LIMITED
Licence No
P141
Licence Type
Production
Spud Date
1991-03-12
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

21/14a- 4 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Dry Hole
Dev Type
--
Convention
--
Primary Target
X
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
24.689
Ground Elev (m)
--
Water Depth (m)
91.44
TD MD (m)
4507.382
TD TVDSS (m)
4482.694
TD Datum Depth (m)
24.689
TD Datum Type
Kelly Bushing
Spud Date
1991-03-12
TD Reached
1991-05-11
Completion Date
1991-05-24
Release Date
1995-05-24

Formation Tops (24)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/14a- 4 Balder Cenozoic 2271.000 2245.843 Lloyds Register
Moray Mesozoic 2271.000 2245.843 Lloyds Register
Balder Tuff Cenozoic 2272.000 2246.841 Lloyds Register
Sele Mesozoic 2311.000 2285.560 Lloyds Register
Cromarty Sandstone Cenozoic 2333.000 2307.418 Lloyds Register
Forties Sandstone Mesozoic 2388.000 2362.162 Lloyds Register
Balmoral Sandstone Cenozoic 2508.000 2481.853 Lloyds Register
Montrose Mesozoic 2508.000 2481.853 Lloyds Register
Lista Mesozoic 2508.000 2481.853 Lloyds Register
Glamis Tuff 2601.000 2574.677 Lloyds Register
Andrew Sandstone Cenozoic 2638.000 2611.608 Lloyds Register
Maureen Mesozoic 2663.000 2636.561 Lloyds Register
Maureen Sandstone Mesozoic 2663.000 2636.561 Lloyds Register
Ekofisk Mesozoic 2770.000 2743.376 Lloyds Register
Chalk Mesozoic 2770.000 2743.376 Lloyds Register
Upper Cretaceous Chalk Mesozoic 2853.000 2826.208 Lloyds Register
Cromer Knoll Mesozoic 3509.000 3478.669 Lloyds Register
Valhall Mesozoic 3509.000 3478.669 Lloyds Register
Humber Mesozoic 4092.000 4060.482 Lloyds Register
Kimmeridge Clay 4092.000 4060.482 Lloyds Register
Fladen Mesozoic 4189.000 4157.263 Lloyds Register
Pentland Mesozoic 4189.000 4157.263 Lloyds Register
Smith Bank Mesozoic 4207.000 4175.221 Lloyds Register
Heron Palaeozoic 4207.000 4175.221 Lloyds Register

Lithology Intervals

No lithology intervals ingested for this well.

Interpreted Data Inventory (LR / WellStrat)

Open Interpreted Data Log
Wellbore Groups Formations Members Strat Intervals Tops HC Occ Core Cuttings DSTs
21/14a- 4 7 10 7 18 24 2 0 1 0 View

Hydrocarbon Occurrence (0)

No hydrocarbon shows or DSTs recorded for this well.

Rock Samples (1)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/14a- 4 Cuttings 548.64 4532.07 -- -- .

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/14a- 4 100.73639678955078 4541.52001953125 9 0 2026-08-06 10:14:09.194353+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/14a- 4
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density RHOB CGG Digital Well Logs 1691.7924 4541.52 18700
caliper CALI CGG Digital Well Logs 1691.7924 4541.52 18700
comp_sonic DTLF CGG Digital Well Logs 1692.0972000000002 4527.804 18608
deep_resistivity ILD CGG Digital Well Logs 1693.0116 4539.5388 18679
deep_resistivity IDER CGG Digital Well Logs 1693.0116 4539.3864 18678
density_correction DRHO CGG Digital Well Logs 1692.5544 4541.52 18695
gamma_ray GR CGG Digital Well Logs 100.7364 4531.4616000000005 29052
gamma_ray SGR CGG Digital Well Logs 1684.9344 4531.6140000000005 18680
gamma_ray CGR CGG Digital Well Logs 1684.9344 4531.6140000000005 18680
med_resistivity IMER CGG Digital Well Logs 1693.164 4540.6056 18685
med_resistivity ILM CGG Digital Well Logs 1692.8592 4540.6056 18687
neutron_por NPHI CGG Digital Well Logs 1692.8592 4536.338400000001 18659
pef PEF CGG Digital Well Logs 1706.5752 4541.52 14092
potassium POTA CGG Digital Well Logs 1684.9344 4531.6140000000005 18680
thorium THOR CGG Digital Well Logs 1684.9344 4531.6140000000005 18680
uranium URAN CGG Digital Well Logs 1684.9344 4531.6140000000005 18680

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/14a- 4 70 4538.620 4506.080 D:\BigSpatial\nsta_raw\CGG_Deviation\21-14a-4 12585db_CGG-Deviation.xlsx

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