Well Data Manager / Well Summary / 21/23a- 4

21/23a- 4

Decommissioned

Well Header

Well No
21/23a- 4
NSTA DEN No
4273
Well Name
--
Drill Seq No
4
Quadrant / Block
21 / 23 a
Surface Location
57.225218, 0.561030
Source Datum
ED50
Subsea Well
Unknown
Platform
--
Slot No
--
Operator
EQUINOR UK LIMITED
Original Operator
--
Sub Area Operator
EQUINOR UK LIMITED
Licence No
P21
Licence Type
Production
Spud Date
1990-12-15
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

21/23a- 4 Original
Abandoned Phase 3 View Log Interpreted Data Survey
Current Intent
Exploration
Original Intent
Exploration
Flow Class
Dry Hole
Dev Type
--
Convention
--
Primary Target
X
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
24.994
Ground Elev (m)
--
Water Depth (m)
85.95
TD MD (m)
2194.560
TD TVDSS (m)
2169.566
TD Datum Depth (m)
24.994
TD Datum Type
Kelly Bushing
Spud Date
1990-12-15
TD Reached
1991-01-13
Completion Date
1991-01-22
Release Date
1995-01-22

Formation Tops (19)

Wellbore Formation Era MD (m) TVDSS (m) Provider
21/23a- 4 Stronsay Cenozoic 1408.000 1382.845 Lloyds Register
Horda Cenozoic 1408.000 1382.845 Lloyds Register
Moray Mesozoic 1606.000 1580.841 Lloyds Register
Balder Cenozoic 1606.000 1580.841 Lloyds Register
Balder Tuff Cenozoic 1606.000 1580.841 Lloyds Register
Montrose Mesozoic 1616.000 1590.841 Lloyds Register
Lista Mesozoic 1616.000 1590.841 Lloyds Register
Maureen Mesozoic 1677.000 1651.839 Lloyds Register
Upper Cretaceous Chalk Mesozoic 1741.000 1715.838 Lloyds Register
Chalk Mesozoic 1741.000 1715.838 Lloyds Register
Lower Cretaceous Undifferentiated Mesozoic 1916.000 1890.836 Lloyds Register
Cromer Knoll Mesozoic 1916.000 1890.836 Lloyds Register
Kimmeridge Clay 1998.000 1972.832 Lloyds Register
Humber Mesozoic 1998.000 1972.832 Lloyds Register
Fulmar Mesozoic 2068.000 2042.820 Lloyds Register
Heron Palaeozoic 2094.000 2068.816 Lloyds Register
Smith Bank Mesozoic 2094.000 2068.816 Lloyds Register
Zechstein Palaeozoic 2105.000 2079.814 Lloyds Register
Turbot Anhydrite Palaeozoic 2105.000 2079.814 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
21/23a- 4 8 10 1 12 19 3 0 1 0 View

Hydrocarbon Occurrence (0)

No hydrocarbon shows or DSTs recorded for this well.

Rock Samples (1)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
21/23a- 4 Cuttings 620.27 2194.56 -- -- .

Wireline Log Inventory (Ingested Curves)

Wellbore Depth Start (m) Depth Stop (m) Typed Curves Auto-scaled Ingested
21/23a- 4 79.85759735107422 2197.760498046875 12 0 2026-08-06 10:20:43.643916+00 View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser
21/23a- 4
Curve Type Best Mnemonic Source Depth Start (m) Depth Stop (m) Samples
bulk_density RHOB CGG Digital Well Logs 614.4768 2197.7604 10222
caliper CALS CGG Digital Well Logs 614.6292000000001 2197.1508 10221
caliper CALI CGG Digital Well Logs 1945.3860000000002 2197.1508 1653
comp_sonic DTLF CGG Digital Well Logs 614.7816 2183.2824 10198
deep_resistivity LLD CGG Digital Well Logs 1532.382 2193.6456000000003 4340
deep_resistivity ILD CGG Digital Well Logs 614.6292000000001 1529.0292000000002 6001
density_correction DRHO CGG Digital Well Logs 1532.382 2197.7604 4324
gamma_ray CGR CGG Digital Well Logs 1937.766 2188.1592 1644
gamma_ray GR CGG Digital Well Logs 79.8576 2188.464 13837
gamma_ray SGR CGG Digital Well Logs 1937.766 2188.1592 1644
med_resistivity ILM CGG Digital Well Logs 614.6292000000001 1530.2484000000002 6009
micro_resistivity MSFL CGG Digital Well Logs 1945.6908 2177.7960000000003 1524
neutron_por NPHI CGG Digital Well Logs 1945.3860000000002 2190.2928 1608
pef PEF CGG Digital Well Logs 617.5248 2195.9316 10054
potassium POTA CGG Digital Well Logs 1937.766 2188.3116 1645
shallow_resistivity LLS CGG Digital Well Logs 1532.8392000000001 2193.6456000000003 4337
shallow_resistivity SFLU CGG Digital Well Logs 614.7816 1529.7912000000001 6005
sp SP CGG Digital Well Logs 614.6292000000001 2165.4516000000003 10068
thorium THOR CGG Digital Well Logs 1937.766 2188.3116 1645
uranium URAN CGG Digital Well Logs 1937.766 2188.3116 1645

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
21/23a- 4 65 2194.560 2169.351 D:\BigSpatial\nsta_raw\CGG_Deviation\21-23a-4 12210as-CGG_Deviation.xlsx

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