Well Data Manager / Well Summary / 21/09- 4

21/09- 4

Decommissioned

Well Header

Well No

21/09- 4

NSTA DEN No

4197

Well Name

Drill Seq No

Quadrant / Block

21 / 9

Surface Location

57.754134, 0.648287

Source Datum

ED50

Subsea Well

Yes

Platform

Slot No

Operator

APACHE NORTH SEA LIMITED

Original Operator

Sub Area Operator

APACHE NORTH SEA LIMITED

Licence No

P57

Licence Type

Production

Spud Date

1990-09-05

Source File

nsta_feature_service

Imported

2026-05-22 15:28

Wellbores (1)

21/09- 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

Well Seq

WB1

Datum Type

Kelly Bushing

Datum Elev (m)

25.910

Ground Elev (m)

Water Depth (m)

110.34

TD MD (m)

2326.000

TD TVDSS (m)

2299.600

TD Datum Depth (m)

25.969

TD Datum Type

Kelly Bushing

Spud Date

1990-09-05

TD Reached

1990-09-13

Completion Date

1990-09-17

Release Date

1994-09-17

Formation Tops (10)

Wellbore	Formation	Era	MD (m)	TVDSS (m)	Provider
21/09- 4	Horda	Cenozoic	136.000	110.090	Lloyds Register
	Stronsay	Cenozoic	136.000	110.090	Lloyds Register
	Balder	Cenozoic	615.000	589.074	Lloyds Register
	Sele	Mesozoic	622.000	596.074	Lloyds Register
	Lista	Mesozoic	664.000	638.072	Lloyds Register
	Moray	Mesozoic	2017.000	1990.908	Lloyds Register
	Cromarty Sandstone	Cenozoic	2053.000	2026.885	Lloyds Register
	Forties Sandstone	Mesozoic	2123.000	2096.838	Lloyds Register
	Montrose	Mesozoic	2178.000	2151.802	Lloyds Register
	Balmoral Sandstone	Cenozoic	2185.000	2158.797	Lloyds Register

Lithology Intervals

21/09- 4 Curve: SANDCOUNT 54 intervals · MD 766.267 – 2318.918 m G:/NSTA_BigFiles/NSTA_Packages/Lloyds_Register/NSTA Centr...

Sandstone (45)

Limestone (9)

Interpreted Data Inventory (LR / WellStrat)

Open Interpreted Data Log

Wellbore	Groups	Formations	Members	Strat Intervals	Tops	HC Occ	Core	Cuttings	DSTs
21/09- 4	3	4	3	7	10	1	1	1	0	View

Hydrocarbon Occurrence (0)

No hydrocarbon shows or DSTs recorded for this well.

Rock Samples (2)

Wellbore	Sample	Top MD (m)	Base MD (m)	Key Lab Results	Comments	Notes
21/09- 4	Cuttings	760.0	2326.0	--	--	--
21/09- 4	Core #1	2060.97	2076.79	--	--	UKCS 241 .

Wireline Log Inventory (Ingested Curves)

Wellbore	Depth Start (m)	Depth Stop (m)	Typed Curves	Auto-scaled	Ingested
21/09- 4	124.20600128173828	2321.81396484375	9	0	2026-08-06 10:11:34.308145+00	View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser

21/09- 4

Curve Type	Best Mnemonic	Source	Depth Start (m)	Depth Stop (m)	Samples
bulk_density	RHOB	CGG Digital Well Logs	747.0648	2320.8996	10328
caliper	CALI	CGG Digital Well Logs	747.8268	2320.7472	10322
caliper	CAL	CGG Digital Well Logs	746.76	2300.7828	10198
comp_sonic	DT	CGG Digital Well Logs	754.6848	2309.7744	10205
deep_resistivity	IDER	CGG Digital Well Logs	748.1316	2320.7472	10320
deep_resistivity	ILD	CGG Digital Well Logs	747.9792	2320.8996	10322
density_correction	DRHO	CGG Digital Well Logs	747.9792	2320.7472	10321
gamma_ray	GRD	CGG Digital Well Logs	728.472	2312.8224	10397
gamma_ray	GR	CGG Digital Well Logs	124.206	2312.8224	14362
med_resistivity	ILM	CGG Digital Well Logs	747.9792	2321.814	10328
med_resistivity	IMER	CGG Digital Well Logs	747.9792	2321.814	10328
neutron_por	NPHI	CGG Digital Well Logs	748.1316	2315.718	10287
pef	PEF	CGG Digital Well Logs	747.9792	2320.8996	10322

Survey Inventory (Deviation)

Open full Survey detail

Wellbore	Stations	Max MD (m)	Max TVDSS (m)	Survey File
21/09- 4	291	2326.000	2299.704	D:\BigSpatial\nsta_raw\CGG_Deviation\21-9-4 11879ak-CGG_Deviation.xlsx

21/09- 4

Well Header

Wellbores (1)

Formation Tops (10)

Lithology Intervals

Interpreted Data Inventory (LR / WellStrat)

Hydrocarbon Occurrence (0)

Rock Samples (2)

Wireline Log Inventory (Ingested Curves)

Source LAS Manifest (Best Curve per Type)

Survey Inventory (Deviation)

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