Well Data Manager / Well Summary / 21/28a- 4

21/28a- 4

Decommissioned

Well Header

Well No
21/28a- 4
NSTA DEN No
3162
Well Name
--
Drill Seq No
4
Quadrant / Block
21 / 28 a
Surface Location
57.130971, 0.533255
Source Datum
ED50
Subsea Well
No
Platform
--
Slot No
--
Operator
NEO NEXT+ ENERGY (ZNI) LIMITED
Original Operator
--
Sub Area Operator
NEO NEXT+ ENERGY (ZNI) LIMITED
Licence No
P77
Licence Type
Production
Spud Date
1987-06-12
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

21/28a- 4 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Appraisal
Original Intent
Appraisal
Flow Class
Oil Show
Dev Type
--
Convention
--
Primary Target
C
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
25.908
Ground Elev (m)
--
Water Depth (m)
89.92
TD MD (m)
1609.950
TD TVDSS (m)
1584.042
TD Datum Depth (m)
25.908
TD Datum Type
Kelly Bushing
Spud Date
1987-06-12
TD Reached
1987-06-21
Completion Date
1987-06-25
Release Date
1991-06-25

Formation Tops (13)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/28a- 4 Horda Cenozoic 1196.000 1170.040 Lloyds Register
Stronsay Cenozoic 1196.000 1170.040 Lloyds Register
Upper Tay Sandstone 1292.000 1266.039 Lloyds Register
Balder Sandstone 1430.000 1404.038 Lloyds Register
Balder Cenozoic 1430.000 1404.038 Lloyds Register
Moray Mesozoic 1430.000 1404.038 Lloyds Register
Sele Mesozoic 1445.000 1419.037 Lloyds Register
Forties Sandstone Mesozoic 1500.000 1474.035 Lloyds Register
Montrose Mesozoic 1523.000 1497.034 Lloyds Register
Lista Mesozoic 1523.000 1497.034 Lloyds Register
Maureen Mesozoic 1565.000 1539.033 Lloyds Register
Ekofisk Mesozoic 1586.000 1560.031 Lloyds Register
Chalk Mesozoic 1586.000 1560.031 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
21/28a- 4 4 6 3 18 13 2 3 1 0 View

Hydrocarbon Occurrence (4)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/28a- 4 Mixed shows OGS Strathtay Formation 1292.352 -- 97 m thick
21/28a- 4 Oil shows OS Strathtay Formation 1389.5832 -- 39 m thick
21/28a- 4 Oil shows OS Strathtay Formation 1428.5976 -- 38 m thick
21/28a- 4 Oil shows OS Forties Sandstone Member 1499.3112 -- 23 m thick

Rock Samples (4)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/28a- 4 Cuttings 192.02 1609.34 -- -- .
21/28a- 4 Core #1 1291.13 1304.24 -- -- .
21/28a- 4 Core #2 1334.41 1346.61 -- -- .
21/28a- 4 Core #3 1371.9 1386.84 -- -- .

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/28a- 4 106.68000030517578 1610.8680419921875 11 0 2026-08-06 17:29:12.90164+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/28a- 4
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density ZDEN CGG Digital Well Logs 962.5584 1610.8680000000002 4255
caliper CAL CGG Digital Well Logs 961.9488 1604.9244 4220
caliper CALI CGG Digital Well Logs 962.2536 1610.8680000000002 4257
comp_sonic AC CGG Digital Well Logs 962.8632 1599.2856000000002 4177
deep_resistivity RILD CGG Digital Well Logs 963.3204000000001 1609.344 4240
density_correction ZCOR CGG Digital Well Logs 963.3204000000001 1610.8680000000002 4250
gamma_ray GR CGG Digital Well Logs 106.68 1603.5528000000002 9823
med_resistivity RILM CGG Digital Well Logs 963.168 1610.2584000000002 4247
micro_resistivity RMLL CGG Digital Well Logs 962.1012000000001 1604.6196 4217
neutron_por CNC CGG Digital Well Logs 962.2536 1605.8388 4224
pef PE CGG Digital Well Logs 962.2536 1610.8680000000002 4257
sp SP CGG Digital Well Logs 963.6252000000001 1609.1916 4237

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/28a- 4 55 1609.954 1583.983 D:\BigSpatial\nsta_raw\CGG_Deviation\21-28a-4 7065ad_CGG-Deviation.xlsx

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