Well Data Manager / Well Summary / 206/01a- 4

206/01a- 4

Decommissioned

Well Header

Well No

206/01a- 4

NSTA DEN No

10116

Well Name

Drill Seq No

Quadrant / Block

206 / 1 a

Surface Location

60.945053, -2.892825

Source Datum

ED50

Subsea Well

Unknown

Platform

Slot No

Operator

PRAX UPSTREAM LIMITED

Original Operator

Sub Area Operator

PRAX UPSTREAM LIMITED

Licence No

P911

Licence Type

Production

Spud Date

2004-03-19

Source File

nsta_feature_service

Imported

2026-05-22 15:28

Wellbores (3)

206/01a- 4 Original

Abandoned Phase 3 Survey

Current Intent

Appraisal

Original Intent

Appraisal

Flow Class

Gas Well

Dev Type

Convention

Primary Target

AB1

Well Seq

WB1

Datum Type

Rotary Table

Datum Elev (m)

29.000

Ground Elev (m)

Water Depth (m)

592.60

TD MD (m)

2235.000

TD TVDSS (m)

2206.000

TD Datum Depth (m)

29.000

TD Datum Type

Rotary Table

Spud Date

2004-03-19

TD Reached

2004-04-04

Completion Date

2004-04-04

Release Date

2008-04-04

206/01a- 4A Sidetrack A parent: 206/01a- 4

Abandoned Phase 1 Interpreted Data Survey

Current Intent

Appraisal

Original Intent

Appraisal

Flow Class

Gas Well

Dev Type

Convention

Primary Target

AB1

Well Seq

WB1

Datum Type

Rotary Table

Datum Elev (m)

29.000

Ground Elev (m)

Water Depth (m)

592.60

TD MD (m)

4062.000

TD TVDSS (m)

3654.500

TD Datum Depth (m)

29.000

TD Datum Type

Rotary Table

Spud Date

2004-04-04

TD Reached

2004-05-24

Completion Date

2004-06-01

Release Date

2008-06-01

206/01a- 4Z Sidetrack Z parent: 206/01a- 4A

Abandoned Phase 1 View Log Interpreted Data Survey

Current Intent

Appraisal

Original Intent

Appraisal

Flow Class

Gas Well

Dev Type

Convention

Primary Target

ABC

Well Seq

WB2

Datum Type

Rotary Table

Datum Elev (m)

29.000

Ground Elev (m)

Water Depth (m)

592.60

TD MD (m)

3829.000

TD TVDSS (m)

3799.200

TD Datum Depth (m)

29.000

TD Datum Type

Rotary Table

Spud Date

2004-06-01

TD Reached

2004-06-27

Completion Date

2004-07-25

Release Date

2008-07-25

Formation Tops (36)

Wellbore	Formation	Era	MD (m)	TVDSS (m)	Provider
206/01a- 4A	Unknown		622.000	593.000	BGS LithoStrat Upper
	Unknown		1265.000	1236.000	BGS LithoStrat Upper
	Balder	Cenozoic	2286.000	2257.000	BGS LithoStrat Upper
	Hildasay Sandstone	Cenozoic	2351.000	2322.000	BGS LithoStrat Upper
	Flett Formation	Cenozoic	2693.000	2664.000	BGS LithoStrat Upper
	Upper Colsay Sandstone		2731.000	2702.000	BGS LithoStrat Upper
	Flett Formation	Cenozoic	2964.000	2935.000	BGS LithoStrat Upper
	Lower Colsay Sandstone		3186.000	3157.000	BGS LithoStrat Upper
	Lamba Formation	Cenozoic	3211.000	3182.000	BGS LithoStrat Upper
	Westerhouse Sandstone Member	Cenozoic	3505.000	3476.000	BGS LithoStrat Upper
	Kettla Tuff	Mesozoic	3588.000	3559.000	BGS LithoStrat Upper
	Vaila Formation V4	Cenozoic	3619.000	3590.000	BGS LithoStrat Upper
	Vaila Formation V3	Cenozoic	3741.000	3712.000	BGS LithoStrat Upper
	A Sand		3970.000	3941.000	BGS LithoStrat Upper
	AB Shale		3986.000	3957.000	BGS LithoStrat Upper
	B Sand		3989.000	3960.000	BGS LithoStrat Upper
	Vaila Formation V3	Cenozoic	4002.000	3973.000	BGS LithoStrat Upper
206/01a- 4Z	Unknown		622.000	593.000	BGS LithoStrat Upper
	Unknown		2200.000	2170.923	BGS LithoStrat Upper
	Balder	Cenozoic	2286.000	2256.897	BGS LithoStrat Upper
	Hildasay Sandstone	Cenozoic	2350.000	2320.878	BGS LithoStrat Upper
	Flett Formation	Cenozoic	2676.000	2646.833	BGS LithoStrat Upper
	Upper Colsay Sandstone		2708.000	2678.801	BGS LithoStrat Upper
	Flett Formation	Cenozoic	2862.000	2832.616	BGS LithoStrat Upper
	Lower Colsay Sandstone		3045.000	3015.454	BGS LithoStrat Upper
	Lamba Formation	Cenozoic	3072.000	3042.437	BGS LithoStrat Upper
	Westerhouse Sandstone Member	Cenozoic	3282.000	3252.324	BGS LithoStrat Upper
	Kettla Tuff	Mesozoic	3378.000	3348.279	BGS LithoStrat Upper
	Vaila Formation V4	Cenozoic	3406.000	3376.266	BGS LithoStrat Upper
	Vaila Formation V3	Cenozoic	3490.000	3460.242	BGS LithoStrat Upper
	A Sand		3672.000	3642.175	BGS LithoStrat Upper
	AB Shale		3676.000	3646.173	BGS LithoStrat Upper
	B Sand		3679.000	3649.172	BGS LithoStrat Upper
	BC Shale		3712.000	3682.161	BGS LithoStrat Upper
	C Sand		3722.000	3692.157	BGS LithoStrat Upper
	Vaila Formation V3	Cenozoic	3736.000	3706.153	BGS LithoStrat Upper

Lithology Intervals

206/01a- 4Z Curve: SANDCOUNT 92 intervals · MD 2350.313 – 3758.336 m G:/NSTA_BigFiles/NSTA_Packages/Lloyds_Register/WoS_ArcGIS...

Sandstone (78)

Coal (7)

Limestone (7)

Interpreted Data Inventory (LR / WellStrat)

Open Interpreted Data Log

Wellbore	Strat Intervals	Tops	HC Occ	DSTs
206/01a- 4	0	0	0	0
206/01a- 4A	17	17	1	0	View
206/01a- 4Z	19	19	1	1	View

Hydrocarbon Occurrence (6)

Wellbore	Category	Code	Formation / Litho	Top MD (m)	Base MD (m)	Notes
206/01a- 4A	Gas shows	GS	VASD	3969.5	--	16 m thick
206/01a- 4A	Gas shows	GS	VBSD	3989.0	--	13 m thick
206/01a- 4Z	Gas shows	GS	VASD	3672.4	--	3 m thick
206/01a- 4Z	Gas shows	GS	VBSD	3679.4000000000005	--	33 m thick
206/01a- 4Z	DST	DST 1	--	3685.03	3703.93	Label / Vaila
206/01a- 4Z	Gas shows	GS	VCSD	3722.0000000000005	--	13 m thick

Rock Samples (0)

No cuttings, core, or plug samples recorded for this well.

Wireline Log Inventory (Ingested Curves)

Wellbore	Depth Start (m)	Depth Stop (m)	Typed Curves	Auto-scaled	Ingested
206/01a- 4Z	2344.978759765625	3813.505126953125	9	0	2026-08-06 10:02:48.817629+00	View Log

Source LAS Manifest (Best Curve per Type)

Open full Manifest browser

206/01a- 4Z

Curve Type	Best Mnemonic	Source	Depth Start (m)	Depth Stop (m)	Samples
bulk_density	DENS	UKCS JDWL 30th Round	3505.962	3808.9332	1989
caliper	CALI	UKCS JDWL 30th Round	3499.866	3808.9332	2029
comp_sonic	DTC	UKCS JDWL 30th Round	2399.9952	3799.4844	9168
density_correction	DENC	UKCS JDWL 30th Round	3505.962	3808.9332	1989
gamma_ray	GR	UKCS JDWL 30th Round	2344.9788	3801.9228	9556
micro_resistivity	MLL	UKCS JDWL 30th Round	3505.962	3813.5052	2019
neutron_por	NEUT	UKCS JDWL 30th Round	3505.962	3803.904	1956
pef	PEF	UKCS JDWL 30th Round	3505.962	3808.9332	1989
sp	SP	UKCS JDWL 30th Round	3509.9244	3785.9208	1812

Survey Inventory (Deviation)

Open full Survey detail

Wellbore	Stations	Max MD (m)	Max TVDSS (m)	Survey File
206/01a- 4	0	--	--	--
206/01a- 4A	0	--	--	--
206/01a- 4Z	88	3813.000	3783.138	G:\NSTA_BigFiles\NSTA_Packages\UKCS_JDWL_30thRound\WOS\206_01a-4Z_DEVIATION_SURVEY_QC.xlsm

206/01a- 4

Well Header

Wellbores (3)

Formation Tops (36)

Lithology Intervals

Interpreted Data Inventory (LR / WellStrat)

Hydrocarbon Occurrence (6)

Rock Samples (0)

Wireline Log Inventory (Ingested Curves)

Source LAS Manifest (Best Curve per Type)

Survey Inventory (Deviation)

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