- General information
Wellbore name
6508/5-1
Type
EXPLORATION
Purpose
WILDCAT
Status
P&A
Factmaps in new window
Main area
NORWEGIAN SEA
Well name
6508/5-1
Seismic location
86 - 122 SP. 595
Drilled in production licence
Drilling operator
A/S Norske Shell
Drill permit
542-L
Drilling facility
Drilling days
33
Entered date
22.04.1987
Completed date
24.05.1987
Release date
24.05.1989
Publication date
30.06.2005
Purpose - planned
WILDCAT
Reentry
NO
Content
DRY
Discovery wellbore
NO
Kelly bushing elevation [m]
22.0
Water depth [m]
411.0
Total depth (MD) [m RKB]
2586.0
Final vertical depth (TVD) [m RKB]
2586.0
Maximum inclination [°]
1.8
Bottom hole temperature [°C]
66
Oldest penetrated age
LATE TRIASSIC
Oldest penetrated formation
RED BEDS (INFORMAL)
Geodetic datum
ED50
NS degrees
65° 42' 51.22'' N
EW degrees
8° 28' 35.37'' E
NS UTM [m]
7288341.64
EW UTM [m]
475973.17
UTM zone
32
NPDID wellbore
1044
 
 
- Wellbore history
General
Well 6508/5-1 was drilled on a structure located in the western part of the Helgeland Basin off shore Mid Norway. The primary target was sandstone of the Early/Middle Jurassic Ile Formation. The Ti1je Formation was a secondary target in the case of a shaled out Early/Middle Jurassic sequence acting as a seal.
Operations and results
Wildcat well 6508/5-1 was spudded with the semi-submersible installation West Vanguard on 22 April 1987 and drilled to TD at 2589 m in the Triassic Red Beds. The hole was drilled without significant problems and without any signs of shallow gas. It was drilled with seawater and gel down to 961 m, and with KCl/polymer mud from 961 m to TD.
The top prospect was encountered at 1778 m and cored. The cored section exhibited excellent porosities with an average of 32% and permeabilities of generally several hundreds of mD to tens of Darcies. From petrophysical log evaluation the whole of Ile Formation had a net to gross of 64% and the same porosity average as in the cored section using a 15% porosity cut off. The Tilje Formation also possessed excellent reservoir characteristics. Reservoir characteristics remained good in the Åre Formation and Red Beds with an average of 25% porosity at around 2500 m. Unfortunately there were no signs of hydrocarbons on the logs and no shows were recorded in any part of the well, except for cut fluorescence in sidewall cores in claystones from the Spekk and upper Melke Formations. The RFT tool was run from 1786 m in the Ile Formation to 2542m in the Red Beds with 13 pressure points acquired. A clear water gradient of 1.013 g/cm3 was established. Post-well organic geochemical analyses included in the well completion reports only partly considered migrated hydrocarbons/shows, but from rock-eval PI data the lack of shows were confirmed. These analyses also proved excellent source rock potential in the Spekk Formation, although more gas-prone than further to the west and south on Mid Norway. Coals of the Åre Formation were present with potential for gas. The well section was however immature for any petroleum generation all through. One conventional core was cut in the Ile Formation from 1786 m to 1804 m. No attempts were made to take fluid samples.
The well was permanently abandoned on 24 may 1987 as a dry hole.
Testing
No drill stem test was performed.
 
 
- Cuttings at the NPD
Cutting sample, top depth [m]
Cutting samples, bottom depth [m]
980.00
2586.00
Cuttings available for sampling?
YES
 
 
- Cores at the NPD
Core sample number
Core sample - top depth
Core sample - bottom depth
Core sample depth - uom
1
1786.0
1798.2
[m ]
Total core sample length [m]
12.2
Cores available for sampling?
YES
 
 
- Core photos
Click to enlarge the pictureClick to enlarge the pictureClick to enlarge the pictureClick to enlarge the pictureClick to enlarge the picture
1786-1791m
1791-1795m
1791-1796m
1796-1798m
 
     
 
 
- Palynological slides at the NPD
Sample depth
Depth unit
Sample type
Laboratory
1120.0
[m]
DC
OD
1130.0
[m]
DC
OD
1140.0
[m]
DC
OD
1150.0
[m]
DC
OD
1160.0
[m]
DC
OD
1170.0
[m]
DC
OD
1180.0
[m]
DC
OD
1190.0
[m]
DC
OD
1200.0
[m]
DC
OD
1210.0
[m]
DC
OD
1220.0
[m]
DC
OD
1230.0
[m]
DC
OD
1240.0
[m]
DC
OD
1250.0
[m]
DC
OD
1260.0
[m]
DC
OD
1270.0
[m]
DC
OD
1280.0
[m]
DC
OD
1290.0
[m]
DC
OD
1300.0
[m]
DC
OD
1310.0
[m]
DC
OD
1320.0
[m]
DC
OD
1330.0
[m]
DC
OD
1340.0
[m]
DC
OD
1350.0
[m]
DC
OD
1360.0
[m]
DC
OD
1370.0
[m]
DC
OD
1380.0
[m]
DC
OD
1390.0
[m]
DC
OD
1400.0
[m]
DC
OD
 
 
- Lithostratigraphy
 
 
- Composite logs
Document name
Document format
Document size [KB]
pdf
0.38
 
 
- Geochemical information
Document name
Document format
Document size [KB]
pdf
1.83
pdf
2.58
 
 
- Documents - older NPD WDSS reports and other related documents
 
 
- Documents - reported by the production licence (period for duty of secrecy expired)
Document name
Document format
Document size [KB]
pdf
4.14
pdf
6.15
pdf
0.83
pdf
0.75
pdf
2.63
 
 
- Logs
Log type
Log top depth [m]
Log bottom depth [m]
CBL VDL
700
15185
ISF LSS GR
519
972
ISF LSS GR
961
1603
ISF LSS GR MSFL
1590
2580
LDL CNL GR
519
975
LDL CNL GR NGT
1590
2580
LDL CNL NGL
961
1605
RFT
1786
2542
SAT
450
2575
SHDT
1590
2581
SWS
0
0
 
 
- Casing and leak-off tests
Casing type
Casing diam.
[inch]
Casing depth
[m]
Hole diam.
[inch]
Hole depth
[m]
LOT mud eqv.
[g/cm3]
Formation test type
CONDUCTOR
30
519.0
36
677.0
0.00
LOT
SURF.COND.
20
960.0
26
975.0
1.50
LOT
INTERM.
13 3/8
1589.0
17 1/2
1603.0
1.62
LOT
OPEN HOLE
2586.0
12 1/4
2586.0
0.00
LOT
 
 
 
- Drilling mud
Depth MD [m]
Mud weight [g/cm3]
Visc. [mPa.s]
Yield point [Pa]
Mud type
Date measured
457
1.03
  
WATER BASED
25.05.1987
1855
1.28
17.0
14.0
WATER BASED
25.05.1987
2586
1.28
16.0
14.0
WATER BASED
21.05.1987
2586
1.28
16.0
14.0
WATER BASED
21.05.1987