Well Data Manager / Well Summary / 21/04b- 5

21/04b- 5

Decommissioned

Well Header

Well No
21/04b- 5
NSTA DEN No
4540
Well Name
--
Drill Seq No
5
Quadrant / Block
21 / 4 b
Surface Location
57.987976, 0.648666
Source Datum
ED50
Subsea Well
Yes
Platform
--
Slot No
--
Operator
CHRYSAOR PRODUCTION (U.K.) LIMITED
Original Operator
--
Sub Area Operator
CHRYSAOR PRODUCTION (U.K.) LIMITED
Licence No
P646
Licence Type
Production
Spud Date
1991-11-14
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

21/04b- 5 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Dry Hole
Dev Type
--
Convention
--
Primary Target
E
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
33.528
Ground Elev (m)
--
Water Depth (m)
150.57
TD MD (m)
3748.430
TD TVDSS (m)
3398.350
TD Datum Depth (m)
33.528
TD Datum Type
Kelly Bushing
Spud Date
1991-11-14
TD Reached
1992-01-27
Completion Date
1992-02-04
Release Date
1996-02-04

Formation Tops (17)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/04b- 5 Horda Cenozoic 1433.000 1399.384 Lloyds Register
Stronsay Cenozoic 1433.000 1399.384 Lloyds Register
Grid Sandstone Cenozoic 1471.000 1437.382 Lloyds Register
Balder Cenozoic 2010.000 1959.557 Lloyds Register
Moray Mesozoic 2010.000 1959.557 Lloyds Register
Balder Tuff Cenozoic 2029.000 1975.869 Lloyds Register
Sele Mesozoic 2055.000 1997.869 Lloyds Register
Forties Sandstone Mesozoic 2156.000 2078.100 Lloyds Register
Montrose Mesozoic 2199.000 2111.516 Lloyds Register
Balmoral Sandstone Cenozoic 2199.000 2111.516 Lloyds Register
Lista Mesozoic 2199.000 2111.516 Lloyds Register
Glamis Tuff 2448.000 2304.484 Lloyds Register
Andrew Sandstone Cenozoic 2479.000 2328.555 Lloyds Register
Maureen Sandstone Mesozoic 2573.000 2401.296 Lloyds Register
Maureen Mesozoic 2573.000 2401.296 Lloyds Register
Chalk Mesozoic 2829.000 2597.918 Lloyds Register
Ekofisk Mesozoic 2829.000 2597.918 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
21/04b- 5 4 6 7 39 17 3 0 1 0 View

Hydrocarbon Occurrence (1)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/04b- 5 Oil shows OS Andrew Sandstone unit 2262.5304 -- 186 m thick

Rock Samples (1)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/04b- 5 Cuttings 615.7 3748.43 -- -- .

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/04b- 5 179.98440551757812 3750.71630859375 9 0 2026-08-06 10:10:24.536458+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/04b- 5
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density RHOB CGG Digital Well Logs 2040.6360000000002 3750.7164000000002 11222
caliper CALI CGG Digital Well Logs 2040.6360000000002 3750.7164000000002 11222
comp_sonic DT CGG Digital Well Logs 602.2848 3739.2864000000004 20585
deep_resistivity ILD CGG Digital Well Logs 603.1992 3748.7352 20641
density_correction DRHO CGG Digital Well Logs 2041.0932 3750.5640000000003 11218
gamma_ray GR CGG Digital Well Logs 1979.6760000000002 3733.038 11506
gamma_ray GRD CGG Digital Well Logs 179.98440000000002 3740.2008 23362
gamma_ray CGR CGG Digital Well Logs 2006.9556 3740.0484 11373
med_resistivity ILM CGG Digital Well Logs 603.3516000000001 3749.6496 20646
neutron_por NPHI CGG Digital Well Logs 2040.7884000000001 3744.6204000000002 11181
pef PEF CGG Digital Well Logs 2041.7028 3750.7164000000002 11215
potassium POTA CGG Digital Well Logs 2006.9556 3740.0484 11373
thorium THOR CGG Digital Well Logs 2006.9556 3740.0484 11373
uranium URAN CGG Digital Well Logs 2007.1080000000002 3740.0484 11372

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/04b- 5 115 3748.430 3398.456 D:\BigSpatial\nsta_raw\CGG_Deviation\21-4b-5 15467da_CGG-Deviation.xlsx

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