Well Data Manager / Well Summary / 21/28a- 8

21/28a- 8

Decommissioned

Well Header

Well No
21/28a- 8
NSTA DEN No
6331
Well Name
--
Drill Seq No
8
Quadrant / Block
21 / 28 a
Surface Location
57.117298, 0.493241
Source Datum
ED50
Subsea Well
Unknown
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
1998-03-09
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (2)

21/28a- 8 Original
Abandoned Phase 3 Interpreted Data Survey
Current Intent
Appraisal
Original Intent
Appraisal
Flow Class
Oil Well
Dev Type
--
Convention
--
Primary Target
H
Well Seq
WB1
Datum Type
Rotary Table
Datum Elev (m)
26.518
Ground Elev (m)
--
Water Depth (m)
88.39
TD MD (m)
5216.000
TD TVDSS (m)
5129.000
TD Datum Depth (m)
26.518
TD Datum Type
Rotary Table
Spud Date
1998-03-09
TD Reached
1998-03-24
Completion Date
1998-03-31
Release Date
2002-03-31
21/28a- 8Z Sidetrack Z parent: 21/28a- 8
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Appraisal
Original Intent
Appraisal
Flow Class
Gas and Oil Well
Dev Type
--
Convention
--
Primary Target
HZ
Well Seq
WB2
Datum Type
Rotary Table
Datum Elev (m)
26.210
Ground Elev (m)
--
Water Depth (m)
88.39
TD MD (m)
5029.000
TD TVDSS (m)
4625.000
TD Datum Depth (m)
26.518
TD Datum Type
Rotary Table
Spud Date
1998-03-31
TD Reached
1998-04-02
Completion Date
1998-04-11
Release Date
2002-04-11

Formation Tops (29)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/28a- 8 Unknown 114.000 87.482 BGS LithoStrat Upper
Nordland Cenozoic 868.000 841.482 BGS LithoStrat Upper
Nordland Cenozoic 878.000 851.482 BGS LithoStrat Upper
Nordland Cenozoic 934.000 907.482 BGS LithoStrat Upper
Lark Formation Cenozoic 1054.000 1027.482 BGS LithoStrat Upper
Lark Formation Cenozoic 1091.000 1064.482 BGS LithoStrat Upper
Lark Formation Cenozoic 1109.000 1082.482 BGS LithoStrat Upper
Horda Formation Cenozoic 1166.000 1139.482 BGS LithoStrat Upper
Horda Formation Cenozoic 1189.000 1162.482 BGS LithoStrat Upper
Horda Formation Cenozoic 1207.000 1180.482 BGS LithoStrat Upper
Upper Tay Sands Cenozoic 1244.000 1217.482 BGS LithoStrat Upper
Lower Tay Sands 1314.000 1287.482 BGS LithoStrat Upper
Balder Cenozoic 1353.000 1326.482 BGS LithoStrat Upper
Sele Mesozoic 1396.000 1369.482 BGS LithoStrat Upper
Sele Mesozoic 1445.000 1418.482 BGS LithoStrat Upper
Lista Mesozoic 1506.000 1479.482 BGS LithoStrat Upper
Tor Mesozoic 1547.000 1520.482 BGS LithoStrat Upper
21/28a- 8Z Horda Cenozoic 1166.000 1118.496 Lloyds Register
Stronsay Cenozoic 1166.000 1118.496 Lloyds Register
Upper Tay Sandstone 1244.000 1180.484 Lloyds Register
Lower Tay Sandstone 1324.000 1243.249 Lloyds Register
Balder Cenozoic 1353.000 1266.225 Lloyds Register
Balder Sandstone 1353.000 1266.225 Lloyds Register
Moray Mesozoic 1353.000 1266.225 Lloyds Register
Sele Mesozoic 1396.000 1300.482 Lloyds Register
Montrose Mesozoic 1499.000 1382.880 Lloyds Register
Lista Mesozoic 1499.000 1382.880 Lloyds Register
Tor Mesozoic 1547.000 1409.976 Lloyds Register
Chalk Mesozoic 1547.000 1409.976 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- 8 0 0 0 17 17 1 3 1 0 View
21/28a- 8Z 4 5 3 13 12 1 0 1 1 View

Hydrocarbon Occurrence (3)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
21/28a- 8 Oil shows OS UTS 1243.584 -- 70 m thick
21/28a- 8Z Oil O UTS 1279.8552 -- 92 m thick
21/28a- 8Z DST DST 1 -- 1343.6 1348.1 Label / Alba

Rock Samples (111)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/28a- 8 Cuttings 871.73 1589.84 -- -- curated May'98 to fill gap
21/28a- 8 Core #1 1242.06 1255.47 φ 37.0% (n=10) · Kh 4117.0 mD (n=10) · Density 2.66 (n=10) · COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 07 1242.06 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 08 1242.365 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 09 1242.67 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 10 1242.974 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 11 1243.279 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 12 1243.584 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 13 1243.889 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 14 1244.194 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 15 1244.498 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 16 1244.803 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 17 1245.108 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 18 1245.413 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 19 1245.718 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 20 1246.022 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 21 1246.327 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 22 1246.632 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 23 1246.937 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 24 1247.242 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 25 1247.546 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 26 1247.851 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 27 1248.156 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 28 1248.461 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 29 1248.766 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 30 1249.07 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 31 1249.375 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 32 1249.68 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 33 1249.985 -- φ 41.6% · Kh 3540.0 mD · Density 2.65 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 34 1250.198 -- φ 37.3% · Kh 2220.0 mD · Density 2.65 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 35 1250.777 -- φ 39.3% · Kh 1290.0 mD · Density 2.79 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 36 1250.945 -- φ 38.4% · Kh 3470.0 mD · Density 2.66 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 37 1251.204 -- φ 36.3% · Kh 3890.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 38 1251.509 -- φ 37.2% · Kh 5740.0 mD · Density 2.65 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 39 1251.859 -- φ 34.8% · Kh 5500.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 40 1252.118 -- φ 35.0% · Kh 5270.0 mD · Density 2.65 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 41 1252.423 -- φ 35.0% · Kh 5110.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 42 1252.728 -- φ 34.9% · Kh 5140.0 mD · Density 2.65 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 43 1253.033 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 Core #2 1260.65 1268.58 COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 07 1260.653 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 08 1260.958 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 09 1261.262 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 10 1261.567 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 11 1261.872 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 12 1262.177 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 13 1262.482 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 14 1262.786 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 15 1263.091 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 16 1263.396 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 17 1263.701 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 18 1264.006 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 19 1264.31 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 20 1264.615 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 21 1264.92 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 22 1265.225 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 23 1265.53 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 24 1265.834 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 25 1266.139 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 26 1266.444 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 27 1266.749 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 Core #3 1356.36 1372.82 φ 38.5% (n=16) · Kh 4728.1 mD (n=16) · Density 2.64 (n=16) · COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 08 1356.604 -- φ 37.8% · Kh 3790.0 mD · Density 2.63 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 09 1356.97 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 10 1357.274 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 11 1357.579 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 12 1357.884 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 13 1358.189 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 14 1358.494 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 15 1358.798 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 16 1359.103 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 17 1359.408 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 18 1359.713 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 19 1360.018 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 20 1360.322 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 21 1360.627 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 22 1360.932 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 23 1361.237 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 24 1361.542 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 25 1361.846 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 26 1362.121 -- φ 39.9% · Kh 4140.0 mD · Density 2.68 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 27 1362.486 -- φ 37.7% · Kh 5730.0 mD · Density 2.65 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 28 1362.822 -- φ 39.9% · Kh 4620.0 mD · Density 2.62 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 29 1363.142 -- φ 38.1% · Kh 4400.0 mD · Density 2.68 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 30 1363.37 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 31 1363.675 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 32 1363.98 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 33 1364.285 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 34 1364.59 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 35 1364.894 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 36 1365.199 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 37 1365.641 -- φ 38.7% · Kh 4660.0 mD · Density 2.63 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 38 1365.809 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 39 1366.114 -- φ 38.9% · Kh 5390.0 mD · Density 2.63 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 40 1366.357 -- φ 38.1% · Kh 4430.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 41 1366.723 -- φ 38.0% · Kh 4350.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 42 1367.028 -- φ 38.5% · Kh 4980.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 43 1367.302 -- φ 38.7% · Kh 3870.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 44 1367.638 -- φ 38.4% · Kh 4560.0 mD · Density 2.62 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 45 1367.942 -- φ 38.7% · Kh 5110.0 mD · Density 2.63 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 46 1368.232 -- φ 37.8% · Kh 4310.0 mD · Density 2.63 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 47 1368.552 -- φ 37.5% · Kh 4720.0 mD · Density 2.63 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 48 1368.857 -- φ 38.9% · Kh 6590.0 mD · Density 2.64 · COREX U.K., LTD. -- --
21/28a- 8 ↳ Plug 49 1369.162 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 50 1369.466 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 51 1369.771 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 52 1370.076 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 53 1370.381 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 54 1370.686 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8 ↳ Plug 55 1370.99 -- COREX U.K., LTD. NO PLUG POSSIBLE - MUDSTONE --
21/28a- 8Z Cuttings 896.11 1532.53 -- -- curated May'98 to fill gap

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/28a- 8Z 2814.0 4940.0 6 0 2026-08-06 17:29:15.551123+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/28a- 8Z
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density ZDEN CGG Digital Well Logs 1208.2272 1502.664 1933
caliper CALX CGG Digital Well Logs 857.7072000000001 1505.712 4253
comp_sonic DT24 CGG Digital Well Logs 857.7072000000001 1505.1024 4249
density_correction ZCOR CGG Digital Well Logs 1206.8556 1502.664 1942
neutron_por CNC CGG Digital Well Logs 1230.1728 1495.3488 1741
pef PE CGG Digital Well Logs 1208.2272 1502.664 1933
potassium K CGG Digital Well Logs 835.152 1489.8624 4297
thorium TH CGG Digital Well Logs 835.152 1489.8624 4297

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/28a- 8 0 -- -- --
21/28a- 8Z 52 1532.839 1409.976 D:\BigSpatial\nsta_raw\CGG_Deviation\21-28a-8Z 27033aj_CGG-Deviation.xlsx

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