20/05a- 1

Decommissioned

Well Header

Well No
20/05a- 1
NSTA DEN No
1633
Well Name
--
Drill Seq No
1
Quadrant / Block
20 / 5 a
Surface Location
57.903305, -0.011598
Source Datum
ED50
Subsea Well
No
Platform
--
Slot No
--
Operator
NEO NEXT + ENERGY RESOURCES UK LIMITED
Original Operator
--
Sub Area Operator
NEO NEXT + ENERGY RESOURCES UK LIMITED
Licence No
P294
Licence Type
Production
Spud Date
1981-01-18
Source File
nsta_feature_service
Imported
2026-05-22 15:28

Wellbores (1)

20/05a- 1 Original
Current Intent
Development
Original Intent
Exploration
Flow Class
Oil Well
Dev Type
--
Convention
--
Primary Target
--
Well Seq
WB1
Datum Type
Kelly Bushing
Datum Elev (m)
33.528
Ground Elev (m)
--
Water Depth (m)
121.90
TD MD (m)
3317.138
TD TVDSS (m)
3280.878
TD Datum Depth (m)
32.918
TD Datum Type
Kelly Bushing
Spud Date
1981-01-18
TD Reached
1981-03-06
Completion Date
1981-03-29
Release Date
1985-03-29

Formation Tops (21)

Wellbore Formation Era MD (m) TVDSS (m) Provider
20/05a- 1 Dornoch Mesozoic 1042.000 1008.472 Lloyds Register
Sele Mesozoic 1233.000 1199.472 Lloyds Register
Forties Sandstone Mesozoic 1407.000 1373.472 Lloyds Register
Montrose Mesozoic 1505.000 1471.472 Lloyds Register
Lista Mesozoic 1505.000 1471.472 Lloyds Register
Balmoral Sandstone Cenozoic 1597.000 1563.472 Lloyds Register
Glamis Tuff 1711.000 1677.472 Lloyds Register
Andrew Sandstone Cenozoic 1764.000 1730.472 Lloyds Register
Maureen Mesozoic 2080.000 2046.472 Lloyds Register
Maureen Sandstone Mesozoic 2080.000 2046.472 Lloyds Register
Chalk Mesozoic 2168.000 2134.472 Lloyds Register
Ekofisk Mesozoic 2168.000 2134.472 Lloyds Register
Upper Cretaceous Chalk Mesozoic 2206.000 2172.472 Lloyds Register
Cromer Knoll Mesozoic 2687.000 2653.472 Lloyds Register
Rodby Mesozoic 2719.000 2685.472 Lloyds Register
Sola 2730.000 2696.472 Lloyds Register
Valhall Mesozoic 2872.000 2838.472 Lloyds Register
Carboniferous Palaeozoic 2905.000 2871.472 Lloyds Register
Carboniferous Undifferentiated Palaeozoic 2905.000 2871.472 Lloyds Register
Old Red Palaeozoic 3026.000 2992.472 Lloyds Register
Old Red Sandstone 3026.000 2992.472 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
20/05a- 1 5 11 5 25 21 2 11 1 2 View

Hydrocarbon Occurrence (12)

Wellbore Category Code Formation / Litho Top MD (m) Base MD (m) Notes
20/05a- 1 Gas shows GS Horda Formation 780.038064 -- 262 m thick
20/05a- 1 Gas shows GS Beauly Member 1041.550368 -- 81 m thick
20/05a- 1 Gas shows GS Montrose Group 1505.0749680000001 -- 325 m thick
20/05a- 1 Gas shows GS Cromer Knoll Group 2739.133968 -- 42 m thick
20/05a- 1 Gas shows GS Cromer Knoll Group 2781.135408 -- 12 m thick
20/05a- 1 Gas shows GS Cromer Knoll Group 2793.135384 -- 27 m thick
20/05a- 1 Gas shows GS Cromer Knoll Group 2820.137616 -- 86 m thick
20/05a- 1 Mixed shows OGS * 2905.6431600000005 -- 11 m thick
20/05a- 1 Oil O * 2916.942096 -- 109 m thick
20/05a- 1 DST DST 1 -- 2921.5 3109.0 Label / Carboniferous
20/05a- 1 DST DST 1 -- 2921.5 3109.0 Label / Devonian
20/05a- 1 Oil O * 3026.148888 -- 291 m thick

Rock Samples (12)

Wellbore Sample Top MD (m) Base MD (m) Key Lab Results Comments Notes
20/05a- 1 Cuttings 846.0 3314.94 -- -- .
20/05a- 1 Core #1 2912.27 2922.45 -- -- .
20/05a- 1 Core #2 2922.06 2927.18 -- -- .
20/05a- 1 Core #3 2927.45 2932.27 -- -- .
20/05a- 1 Core #4 2933.76 2939.16 -- -- .
20/05a- 1 Core #5 2939.98 2949.46 -- -- .
20/05a- 1 Core #6 3010.45 3016.97 -- -- .
20/05a- 1 Core #7 3016.97 3024.56 -- -- .
20/05a- 1 Core #8 3024.56 3036.66 -- -- .
20/05a- 1 Core #9 3036.66 3044.46 -- -- .
20/05a- 1 Core #10 3313.45 3314.67 -- -- .
20/05a- 1 Core #11 3315.07 3317.05 -- -- .

Wireline Log Inventory (Ingested Curves)

No wireline log curves ingested for this well.

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser

No scanned LAS source files matched to this well.

Survey Inventory (Deviation)

Open full Survey detail
Wellbore Stations Max MD (m) Max TVDSS (m) Survey File
20/05a- 1 0 -- -- --

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