Well Data Manager / Well Summary / 21/04a- 4

21/04a- 4

Decommissioned

Well Header

Well No
21/04a- 4
NSTA DEN No
4405
Well Name
--
Drill Seq No
4
Quadrant / Block
21 / 4 a
Surface Location
57.982505, 0.753225
Source Datum
ED50
Subsea Well
No
Platform
--
Slot No
--
Operator
CHRYSAOR PRODUCTION (U.K.) LIMITED
Original Operator
--
Sub Area Operator
CHRYSAOR PRODUCTION (U.K.) LIMITED
Licence No
P347
Licence Type
Production
Spud Date
1991-06-06
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

21/04a- 4 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Oil Show
Dev Type
--
Convention
--
Primary Target
D
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
26.213
Ground Elev (m)
--
Water Depth (m)
147.83
TD MD (m)
2499.360
TD TVDSS (m)
2472.650
TD Datum Depth (m)
26.213
TD Datum Type
Kelly Bushing
Spud Date
1991-06-06
TD Reached
1991-07-11
Completion Date
1991-07-22
Release Date
1995-07-22

Formation Tops (17)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/04a- 4 Horda Cenozoic 1575.000 1548.766 Lloyds Register
Stronsay Cenozoic 1575.000 1548.766 Lloyds Register
Grid Sandstone Cenozoic 1615.000 1588.760 Lloyds Register
Caran Sanstone 1752.000 1725.695 Lloyds Register
Skroo Sandstone Cenozoic 1916.000 1889.604 Lloyds Register
Balder Cenozoic 1955.000 1928.583 Lloyds Register
Moray Mesozoic 1955.000 1928.583 Lloyds Register
Balder Tuff Cenozoic 1955.000 1928.583 Lloyds Register
Sele Mesozoic 1977.000 1950.571 Lloyds Register
Forties Sandstone Mesozoic 2073.000 2046.519 Lloyds Register
Lista Mesozoic 2135.000 2108.492 Lloyds Register
Montrose Mesozoic 2135.000 2108.492 Lloyds Register
Balmoral Sandstone Cenozoic 2142.000 2115.489 Lloyds Register
Glamis Tuff 2245.000 2218.444 Lloyds Register
Andrew Sandstone Cenozoic 2286.000 2259.422 Lloyds Register
Maureen Sandstone Mesozoic 2404.000 2377.351 Lloyds Register
Maureen Mesozoic 2404.000 2377.351 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
21/04a- 4 3 5 9 22 17 2 0 1 0 View

Hydrocarbon Occurrence (7)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/04a- 4 Oil shows OS Horda Formation 1574.5968 -- 48 m thick
21/04a- 4 Oil shows OS Horda Formation 1622.1456 -- 130 m thick
21/04a- 4 Oil shows OS ALBA 1751.9904000000001 -- 123 m thick
21/04a- 4 Oil shows OS TYSD 1915.6680000000001 -- 40 m thick
21/04a- 4 Oil shows OS Andrew Sandstone unit 2286.0 -- 118 m thick
21/04a- 4 Oil shows OS Maureen Formation 2403.6528000000003 -- 44 m thick
21/04a- 4 Oil shows OS Maureen Formation 2447.5440000000003 -- 44 m thick

Rock Samples (1)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/04a- 4 Cuttings 438.91 2499.36 -- -- .

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/04a- 4 136.7028045654297 2488.692138671875 11 0 2026-08-06 10:10:18.702694+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/04a- 4
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density RHOB CGG Digital Well Logs 1457.7060000000001 2488.5396 6765
caliper CALI CGG Digital Well Logs 1457.7060000000001 2488.692 6766
caliper CALS CGG Digital Well Logs 426.8724 2488.692 13443
comp_sonic DTLF CGG Digital Well Logs 427.0248 2479.0908 13414
deep_resistivity LLD CGG Digital Well Logs 428.0916 2488.0824000000002 13518
density_correction DRHO CGG Digital Well Logs 1458.7728 2488.5396 6758
gamma_ray GRD CGG Digital Well Logs 1449.6288000000002 2479.8528 6761
gamma_ray GR CGG Digital Well Logs 136.7028 2482.1388 15391
micro_resistivity MSFL CGG Digital Well Logs 427.1772 1443.6852000000001 6671
neutron_por NPHI CGG Digital Well Logs 1457.5536 2482.7484 6728
pef PEF CGG Digital Well Logs 1458.468 2488.5396 6760
shallow_resistivity LLS CGG Digital Well Logs 427.9392 2488.2348 13520
sp SP CGG Digital Well Logs 429.61560000000003 2460.8028 13167

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/04a- 4 57 2499.360 2472.653 D:\BigSpatial\nsta_raw\CGG_Deviation\21-4a-4 14618av_CGG-Deviation.xlsx

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