Well Data Manager / Well Summary / 9/23a- 27

9/23a- 27

Decommissioned

Well Header

Well No
9/23a- 27
NSTA DEN No
4574
Well Name
--
Drill Seq No
27
Quadrant / Block
9 / 23 a
Surface Location
59.300483, 1.574700
Source Datum
ED50
Subsea Well
Unknown
Platform
--
Slot No
--
Operator
NEO NEXT+ ENERGY E&P NORTH SEA UK LIMITED
Original Operator
--
Sub Area Operator
NEO NEXT+ ENERGY E&P NORTH SEA UK LIMITED
Licence No
P257
Licence Type
Production
Spud Date
1991-11-19
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (2)

9/23a- 27 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Appraisal
Original Intent
Appraisal
Flow Class
Oil and Gas Shows
Dev Type
--
Convention
--
Primary Target
E
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
24.384
Ground Elev (m)
--
Water Depth (m)
113.39
TD MD (m)
2153.412
TD TVDSS (m)
2127.503
TD Datum Depth (m)
24.384
TD Datum Type
Kelly Bushing
Spud Date
1991-11-19
TD Reached
1991-12-03
Completion Date
1991-12-07
Release Date
1995-12-07
9/23a- 27Z Sidetrack Z parent: 9/23a- 27
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Appraisal
Original Intent
Appraisal
Flow Class
Oil Well
Dev Type
--
Convention
--
Primary Target
E
Well Seq
WB2
Datum Type
Kelly Bushing
Datum Elev (m)
24.384
Ground Elev (m)
--
Water Depth (m)
113.39
TD MD (m)
2111.959
TD TVDSS (m)
1830.324
TD Datum Depth (m)
24.384
TD Datum Type
Kelly Bushing
Spud Date
1991-12-04
TD Reached
1991-12-17
Completion Date
1992-01-18
Release Date
1996-01-18

Formation Tops (19)

Wellbore Formation Era MD (m) TVDSS (m) Provider
9/23a- 27 Unknown 138.000 113.614 BGS LithoStrat Upper
Oligocene Clay Unit 668.000 643.606 BGS LithoStrat Upper
Oligocene Clay Unit 910.000 885.603 BGS LithoStrat Upper
Grid Formation 924.000 899.602 BGS LithoStrat Upper
Horda Formation Cenozoic 1160.000 1135.540 BGS LithoStrat Upper
Upper Frigg Formation 1484.000 1459.161 BGS LithoStrat Upper
Upper Balder Cenozoic 1608.000 1582.943 BGS LithoStrat Upper
Middle Balder Cenozoic 1687.000 1661.812 BGS LithoStrat Upper
Lower Balder Cenozoic 1723.000 1697.757 BGS LithoStrat Upper
Sele Mesozoic 1748.000 1722.724 BGS LithoStrat Upper
Lista Mesozoic 1853.000 1827.569 BGS LithoStrat Upper
Heimdal 1980.000 1954.360 BGS LithoStrat Upper
9/23a- 27Z Grid Formation 924.000 899.585 BGS LithoStrat Upper
Horda Formation Cenozoic 1163.000 1134.395 BGS LithoStrat Upper
Upper Frigg Formation 1591.000 1463.264 BGS LithoStrat Upper
Upper Balder Cenozoic 1791.000 1599.010 BGS LithoStrat Upper
Middle Balder Cenozoic 1887.000 1666.263 BGS LithoStrat Upper
Lower Balder Cenozoic 1960.000 1718.271 BGS LithoStrat Upper
Sele Mesozoic 1985.000 1736.061 BGS LithoStrat Upper

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
9/23a- 27 0 0 0 12 12 0 2 1 0 View
9/23a- 27Z 0 0 0 0 7 0 0 1 0 View

Hydrocarbon Occurrence (2)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
9/23a- 27 Mixed shows OGS BLDU 1608.1248 -- 79 m thick
9/23a- 27 Oil shows OS BLDM 1687.068 -- 36 m thick

Rock Samples (35)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
9/23a- 27 Cuttings 914.4 2152.5 -- -- .
9/23a- 27 Core #1 1671.83 1690.21 φ 14.9% (n=12) · Kh 28.2 mD (n=7) · Kv 0.8 mD (n=3) · Density 2.73 (n=12) · THE ROBERTSON GROUP PLC FRACTURED; MUDSTONE NO ANALYSIS; NO ANALYSIS | SST, F, SL ARG, MOD IND, SL CALC, TR PYR.; SST, F, SL ARG, W.IND, V CALC.; SST, F-MED, SL ARG, MOD IND, SL CALC, FRAC.; SST, VF W/ RARE F GRNS, SL-MOD ARG, MOD IND, SL CALC, SL MIC, OCC FE ST GRNS.; SST, VF, MOD ARG, MOD IND, SL CALC, OCC MIC, OCC CARB FRAGS.; SST, VF, MOD ARG, MOD IND, SL CALC, OCC MIC.; SST, VF-MED W/ RARE CRS GRNS, W.IND, V CALC, TR PYR.; SST, VF-OCC MED, SL ARG, MOD-W.IND, SL CALC W/ MDST CL (3X30MM).; SST, VF-OCC MED, SL ARG, MOD-W.IND, SL CALC. .
9/23a- 27 ↳ Core Plug #1 1673.047 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Plug 06 1673.352 -- φ 23.1% · Kh 3.6 mD · Density 2.72 · THE ROBERTSON GROUP PLC SST, VF, MOD ARG, MOD IND, SL CALC, OCC MIC. --
9/23a- 27 ↳ Plug 07 1673.657 -- THE ROBERTSON GROUP PLC NO ANALYSIS --
9/23a- 27 ↳ Plug 08 1674.084 -- φ 18.3% · Kh 1.0 mD · Density 2.79 · THE ROBERTSON GROUP PLC SST, VF W/ RARE F GRNS, SL-MOD ARG, MOD IND, SL CALC, SL MIC, OCC FE ST GRNS. --
9/23a- 27 ↳ Plug 8V 1674.084 -- φ 20.5% · Kv 1.4 mD · Density 2.79 · THE ROBERTSON GROUP PLC SST, VF W/ RARE F GRNS, SL-MOD ARG, MOD IND, SL CALC, SL MIC, OCC FE ST GRNS. --
9/23a- 27 ↳ Plug 09 1674.327 -- φ 19.4% · Kh 0.8 mD · Density 2.70 · THE ROBERTSON GROUP PLC SST, VF, MOD ARG, MOD IND, SL CALC, OCC MIC, OCC CARB FRAGS. --
9/23a- 27 ↳ Plug 10 1674.48 -- φ 19.2% · Kh 0.7 mD · Density 2.69 · THE ROBERTSON GROUP PLC SST, VF, MOD ARG, MOD IND, SL CALC, OCC MIC, OCC CARB FRAGS. --
9/23a- 27 ↳ Core Plug #1 1674.876 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Core Plug #1 1675.181 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Plug 13 1675.425 -- φ 21.6% · Kh 189.0 mD · Density 2.68 · THE ROBERTSON GROUP PLC SST, F, SL ARG, MOD IND, SL CALC, TR PYR. --
9/23a- 27 ↳ Plug 13V 1675.455 -- φ 21.4% · Density 2.66 · THE ROBERTSON GROUP PLC FRACTURED | SST, F-MED, SL ARG, MOD IND, SL CALC, FRAC. --
9/23a- 27 ↳ Plug 14 1675.714 -- φ 2.5% · Kh 0.0 mD · Density 2.74 · THE ROBERTSON GROUP PLC SST, F, SL ARG, W.IND, V CALC. --
9/23a- 27 ↳ Core Plug #1 1676.095 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Core Plug #1 1678.838 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Plug 25V 1679.174 -- φ 4.1% · Kv 0.0 mD · Density 2.80 · THE ROBERTSON GROUP PLC SST, VF-MED W/ RARE CRS GRNS, W.IND, V CALC, TR PYR. --
9/23a- 27 ↳ Plug 25 1679.204 -- φ 1.8% · Density 2.79 · THE ROBERTSON GROUP PLC FRACTURED | SST, VF-MED W/ RARE CRS GRNS, W.IND, V CALC, TR PYR. --
9/23a- 27 ↳ Core Plug #1 1679.448 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Core Plug #1 1688.897 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Plug 58 1689.08 -- φ 14.4% · Kh 2.5 mD · Density 2.69 · THE ROBERTSON GROUP PLC SST, VF-OCC MED, SL ARG, MOD-W.IND, SL CALC. --
9/23a- 27 ↳ Plug 58V 1689.11 -- φ 12.8% · Kv 1.0 mD · Density 2.70 · THE ROBERTSON GROUP PLC SST, VF-OCC MED, SL ARG, MOD-W.IND, SL CALC W/ MDST CL (3X30MM). --
9/23a- 27 ↳ Core Plug #1 1689.506 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Core Plug #1 1690.116 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 Core #2 1769.06 1784.76 φ 27.5% (n=5) · Kh 393.0 mD (n=3) · Kv 453.5 mD (n=2) · Density 2.68 (n=5) · THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS | SST, F-CRS, SL ARG, P-MOD IND, TR CALC, MOD DISSEM PYR.; SST, F-MED W/ OCC CRS GRNS, SL ARG, P-MOD IND, TR CALC, TR MIC.; SST, F-MED W/ SL LINEAR VF-F GRND ZONES, SL ARG, P-MOD IND, TR CALC.; SST, F-MED, SL ARG, P-MOD IND, TR CALC, TR MIC, LOCALLY CMN PATCHY PYR. .
9/23a- 27 ↳ Plug 63 1769.501 -- φ 28.0% · Kh 560.0 mD · Density 2.68 · THE ROBERTSON GROUP PLC SST, F-MED, SL ARG, P-MOD IND, TR CALC, TR MIC, LOCALLY CMN PATCHY PYR. --
9/23a- 27 ↳ Plug 63V 1769.547 -- φ 30.0% · Kv 621.0 mD · Density 2.64 · THE ROBERTSON GROUP PLC SST, F-MED W/ OCC CRS GRNS, SL ARG, P-MOD IND, TR CALC, TR MIC. --
9/23a- 27 ↳ Plug 64 1769.699 -- φ 28.5% · Kh 254.0 mD · Density 2.64 · THE ROBERTSON GROUP PLC SST, F-MED W/ SL LINEAR VF-F GRND ZONES, SL ARG, P-MOD IND, TR CALC. --
9/23a- 27 ↳ Core Plug #2 1769.974 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Core Plug #2 1775.46 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Plug 84V 1775.704 -- φ 25.5% · Kv 286.0 mD · Density 2.74 · THE ROBERTSON GROUP PLC SST, F-CRS, SL ARG, P-MOD IND, TR CALC, MOD DISSEM PYR. --
9/23a- 27 ↳ Plug 84 1775.765 -- φ 25.5% · Kh 365.0 mD · Density 2.70 · THE ROBERTSON GROUP PLC SST, F-CRS, SL ARG, P-MOD IND, TR CALC, MOD DISSEM PYR. --
9/23a- 27 ↳ Core Plug #2 1776.07 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27 ↳ Core Plug #2 1784.604 -- THE ROBERTSON GROUP PLC MUDSTONE NO ANALYSIS --
9/23a- 27Z Cuttings 914.4 2111.96 -- -- .

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
9/23a- 27 76.80960083007812 2152.49755859375 8 0 2026-08-06 16:07:31.478512+00 View Log
9/23a- 27Z 871.72802734375 2066.2392578125 8 0 2026-08-06 16:07:33.805011+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
9/23a- 27
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density DEN OGA Batch Unzipped 896.5692 2154.936 8258
bulk_density CDEN Energective CorrectedLOGS 897.9408000000001 2151.888 8229
bulk_density RHOB CGG Digital Well Logs 896.874 2152.9548 8243
cable_tension TENS OGA Batch Unzipped 81.6864 2151.888 13585
caliper CALI CGG Digital Well Logs 896.4168000000001 2152.9548 8246
caliper CLD Energective CorrectedLOGS 896.4168000000001 2151.888 8239
comp_sonic DT CGG Digital Well Logs 896.5692 2142.1344 8174
comp_sonic DTC Energective CorrectedLOGS 928.1160000000001 2143.9632 7979
deep_resistivity ILD Energective CorrectedLOGS 897.9408000000001 2152.4976 8233
deep_resistivity RES_DEP OGA Batch Unzipped 897.4836 2153.7168 8244
density_correction DENC OGA Batch Unzipped 881.7864000000001 2154.936 8355
density_correction DRHO CGG Digital Well Logs 896.5692 2152.9548 8245
density_correction CDRH Energective CorrectedLOGS 897.9408000000001 2151.888 8229
gamma_ray GR CGG Digital Well Logs 76.8096 2150.2116 13606
gamma_ray SGR CGG Digital Well Logs 1524.3048000000001 2148.84 4099
gamma_ray CGR CGG Digital Well Logs 1524.3048000000001 2148.6876 4098
gamma_ray GRD CGG Digital Well Logs 879.0432000000001 2149.6020000000003 8338
gamma_ray GRI Energective CorrectedLOGS 76.8096 2149.4496 13601
med_resistivity RES_MED OGA Batch Unzipped 83.36280000000001 2153.7168 13586
med_resistivity ILM Energective CorrectedLOGS 897.9408000000001 2152.4976 8233
neutron_por NEU OGA Batch Unzipped 878.8908 2152.1928000000003 8346
neutron_por NPHI CGG Digital Well Logs 896.5692 2151.5832 8236
neutron_por CNEU Energective CorrectedLOGS 897.9408000000001 2151.888 8229
potassium POTA CGG Digital Well Logs 1524.3048000000001 2148.84 4099
thorium THOR CGG Digital Well Logs 1524.4572 2148.84 4098
tvdss SS Energective CorrectedLOGS 76.8096 2152.8024 13623
uranium URAN CGG Digital Well Logs 1524.3048000000001 2148.84 4099
9/23a- 27Z
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density DEN OGA Batch Unzipped 897.4836 2066.0868 7669
bulk_density CDEN Energective CorrectedLOGS 897.4836 2066.2392 7670
bulk_density RHOB CGG Digital Well Logs 897.3312000000001 2059.3812000000003 7626
caliper CALI CGG Digital Well Logs 896.874 2050.3896 7570
caliper CLD Energective CorrectedLOGS 897.3312000000001 2050.0848 7565
comp_sonic DT CGG Digital Well Logs 897.1788 2053.7424 7590
comp_sonic DTC Energective CorrectedLOGS 909.3708 2057.0952 7532
deep_resistivity RES_DEP OGA Batch Unzipped 898.2456000000001 2065.6296 7661
deep_resistivity ILD Energective CorrectedLOGS 898.2456000000001 2063.8008 7649
density_correction DENC OGA Batch Unzipped 876.7572 2066.0868 7805
density_correction DRHO CGG Digital Well Logs 897.9408000000001 2059.2288000000003 7621
density_correction CDRH Energective CorrectedLOGS 897.7884 2064.7152 7658
gamma_ray GR CGG Digital Well Logs 871.7280000000001 2061.972 7811
gamma_ray GRI Energective CorrectedLOGS 871.7280000000001 2062.1244 7812
gamma_ray SGR CGG Digital Well Logs 871.2708 2059.9908 7801
gamma_ray CGR CGG Digital Well Logs 871.2708 2059.9908 7801
gamma_ray GRD CGG Digital Well Logs 871.2708 2060.6004000000003 7805
med_resistivity RES_MED OGA Batch Unzipped 878.1288000000001 2065.6296 7793
med_resistivity ILM Energective CorrectedLOGS 898.398 2065.782 7661
neutron_por NEU OGA Batch Unzipped 874.014 2063.1912 7804
neutron_por NPHI CGG Digital Well Logs 897.3312000000001 2055.7236000000003 7602
neutron_por CNEU Energective CorrectedLOGS 874.014 2062.8864000000003 7802
potassium POTA CGG Digital Well Logs 871.2708 2059.9908 7801
thorium THOR CGG Digital Well Logs 871.2708 2059.9908 7801
tvdss SS Energective CorrectedLOGS 871.7280000000001 2066.5440000000003 7841
uranium URAN CGG Digital Well Logs 871.2708 2059.9908 7801

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
9/23a- 27 49 2153.412 2127.520 D:\BigSpatial\nsta_raw\CGG_Deviation\9-23a-27 15456ak_CGG-Deviation.xlsx
9/23a- 27Z 71 2111.959 1827.431 G:\NSTA_BigFiles\OGA_Batch_Unzipped\UK_9\9_23a- 27Z\WELL_PATH\WDD_QC\9_23a-_27Z_wdd_WDD_FILE_234191358_DATACO_MAPPED.csv

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