6407/5-1
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General information
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Wellbore history
GeneralWell 6407/5-1 was situated in Gimsan Basin, on the eastern limits of the Halten Terrace adjacent to the Trøndelag Platform. The primary target for the well was an Early Cretaceous stratigraphic play, which had been interpreted seismically as a submarine fan deposit.Operations and resultsWildcat well 6407/5-1 was spudded with Wilh. Wilhelmsen A/S semi-submersible rig Treasure Scout on 11 December 1987 and drilled to TD at 4306 m in the Middle Jurassic Garn Formation. The well was drilled with seawater and hi-vis pills down to 1025 m, with seawater/gel/lignosulphonate mud from 1025 m to 2053, and with seawater/polymer mud from 2053 m to TD.á Drilling proceeded without significant problems. No shallow gas was encountered.The well penetrated the Early Cretaceous at 2920.5 m, (prognosed at 2980 m) and a thick argillaceous sequence was drilled. There were no indications of sand in Early Cretaceous, or in Late Jurassic. Seismics showed a wedge (the prospect), but there was no sand present. An exotic section of Early Cretaceous and Late Jurassic claystones is present within the Early Cretaceous over the interval 3605 m to 3655 m. The logs showed two well-defined hot shales that have not been observed before. This section was interpreted as a displaced gravity slide block. The Early Cretaceous sediments below consist of argillaceous lithologies, again with no reservoir development.Minor weak shows occurred in thin sandstone units over the interval 2370 to 2600 m in the Lange Formation. Weak shows were also recorded in the shales of the displaced slide block, in the Spekk Formation, and in the Melke Formation. The sandstones of the Garn Formation also had weak shows, but without visible stain. The Garn sandstones had porosity less than 6 %, and there were no noticed closures at Garn level. The Late Jurassic Spekk shales showed good development in the well position with a thickness of 247 m, and geochemical analyses showed very good source potential with total organic carbon in the range 1 % to 8 %. However, the geochemistry also indicated that the organic matter in Spekk in the area is less oil prone and more gas prone than is usual for this formation. Two cores were cut, one from 3964 m to 3973.1 m in the Late Jurassic Spekk Formation shales, and the second from 4206 m to 4224 m in the Middle Jurassic Garn Formation sandstone. Attempts to obtain RFT measurements and samples were unsuccessful due to tight formation. Consequently it was decided not to perform further tests.The well was plugged and abandoned on 4 March 1988 as a dry well with shows.TestingNo drill stem test was performed -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?NOCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]1030.004306.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13964.03973.1[m ]24206.04220.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]23.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory620.0[m]DCOD630.0[m]DCOD640.0[m]DCOD650.0[m]DCOD660.0[m]DCOD670.0[m]DCOD680.0[m]DCOD690.0[m]DCOD700.0[m]DCOD710.0[m]DCOD720.0[m]DCOD730.0[m]DCOD740.0[m]DCOD750.0[m]DCOD760.0[m]DCOD770.0[m]DCOD780.0[m]DCOD790.0[m]DCOD800.0[m]DCOD810.0[m]DCOD820.0[m]DCOD830.0[m]DCOD840.0[m]DCOD850.0[m]DCOD860.0[m]DCOD1060.0[m]DCRRI1180.0[m]DCRRI1300.0[m]DCRRI1420.0[m]DCRRI1540.0[m]DCRRI1660.0[m]DCRRI1780.0[m]DCRRI1900.0[m]DCRRI2020.0[m]DCRRI2110.0[m]DCRRI2150.0[m]DCRRI2200.0[m]DCRRI2250.0[m]DCRRI2290.0[m]DCRRI2350.0[m]DCRRI2470.0[m]DCRRI2560.0[m]DCRRI2650.0[m]DCRRI2740.0[m]DCRRI2830.0[m]DCRRI2920.0[m]DCRRI2950.0[m]SWCRRI2980.0[m]DCRRI3010.0[m]DCRRI3030.0[m]DCRRI3050.0[m]DCRRI3070.0[m]DCRRI3100.0[m]DCRRI3115.0[m]DCRRI3130.0[m]DCRRI3150.0[m]SWCRRI3170.0[m]DCRRI3190.0[m]DCRRI3200.0[m]DCRRI3220.0[m]DCRRI3238.0[m]SWCRRI3256.0[m]SWCRRI3269.0[m]SWCRRI3279.0[m]DCRRI3300.0[m]SWCRRI3320.0[m]DCRRI3350.0[m]SWCRRI3370.0[m]DCRRI3400.0[m]SWCRRI3420.0[m]DCRRI3441.0[m]DCRRI3445.0[m]DCRRI3449.0[m]SWCRRI3456.0[m]DCRRI3459.0[m]DCRRI3471.0[m]DCRRI3486.0[m]DCRRI3501.0[m]SWCRRI3516.0[m]DCRRI3531.0[m]DCRRI3540.0[m]DCRRI3546.0[m]DCRRI3549.0[m]DCRRI3550.0[m]SWCRRI3561.0[m]DCRRI3561.0[m]DCOD3573.0[m]DCOD3576.0[m]DCRRI3585.0[m]DCOD3591.0[m]DCRRI3597.0[m]DCOD3600.0[m]DCOD3600.0[m]SWCRRI3600.0[m]DCRRI3609.0[m]DCRRI3609.0[m]DCOD3610.0[m]SWCRRI3618.0[m]DCOD3621.0[m]DCOD3627.0[m]DCOD3627.0[m]DCRRI3630.0[m]DCRRI3630.0[m]SWCRRI3636.0[m]DCOD3639.0[m]DCRRI3645.0[m]DCOD3648.0[m]DCRRI3650.0[m]SWCRRI3654.0[m]DCOD3660.0[m]SWCRRI3663.0[m]DCOD3666.0[m]DCRRI3670.0[m]SWCRRI3670.0[m]DCRRI3678.0[m]DCRRI3680.0[m]SWCRRI3690.0[m]SWCRRI3696.0[m]DCRRI3700.0[m]SWCRRI3710.0[m]SWCRRI3720.0[m]DCRRI3726.0[m]DCRRI3730.0[m]SWCRRI3740.0[m]SWCRRI3750.0[m]SWCRRI3760.0[m]SWCRRI3770.0[m]SWCRRI3790.0[m]SWCRRI3800.0[m]SWCRRI3810.0[m]SWCRRI3819.0[m]DCRRI3820.0[m]SWCRRI3830.0[m]SWCRRI3837.0[m]DCRRI3840.0[m]SWCRRI3849.0[m]DCOD3850.0[m]SWCRRI3860.0[m]SWCRRI3867.0[m]DCOD3870.0[m]SWCRRI3873.0[m]DCRRI3880.0[m]SWCRRI3885.0[m]DCOD3890.0[m]SWCRRI3897.0[m]DCRRI3900.0[m]DCRRI3900.0[m]SWCRRI3903.0[m]DCOD3909.0[m]DCRRI3910.0[m]SWCRRI3918.0[m]DCRRI3921.0[m]DCOD3930.0[m]SWCRRI3930.0[m]DCRRI3939.0[m]DCOD3945.0[m]DCRRI3950.0[m]SWCRRI3957.0[m]DCOD3964.1[m]COD3964.1[m]CRRI3965.1[m]COD3966.0[m]CRRI3967.9[m]COD3968.6[m]COD3969.3[m]COD3970.2[m]COD3971.5[m]COD3972.0[m]DCRRI3972.7[m]COD3973.0[m]CRRI3975.0[m]DCOD3980.0[m]SWCRRI3990.0[m]SWCRRI3990.0[m]DCRRI3993.0[m]DCOD3999.0[m]DCRRI4010.0[m]SWCRRI4011.0[m]DCOD4029.0[m]DCOD4040.0[m]SWCRRI4047.0[m]DCOD4050.0[m]DCRRI4057.0[m]SWCRRI4062.0[m]DCRRI4065.0[m]DCOD4083.0[m]DCOD4089.0[m]DCRRI4090.0[m]SWCRRI4100.0[m]SWCRRI4101.0[m]DCRRI4101.0[m]DCOD4110.0[m]SWCRRI4119.0[m]DCOD4131.0[m]DCOD4134.0[m]DCRRI4140.0[m]SWCRRI4157.0[m]DCRRI4170.0[m]SWCRRI4181.0[m]SWCRRI4181.0[m]DCRRI4191.0[m]SWCRRI4197.0[m]DCRRI4206.0[m]CRRI4211.0[m]CRRI4215.0[m]CRRI4250.0[m]SWCRRI4260.0[m]DCRRI4270.0[m]SWCRRI4290.0[m]DCRRI4300.0[m]SWCRRI4306.0[m]DCRRI -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2442441206127712771988198820702173217323452921292136053655385038733873412042054205 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.75 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf9.66 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf24.74 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR8801445CST GR21004000CST GR37104300DIL BHC GR10002052DIL BHC MSFL GR00DIL BHC SP CAL20424252DIL BHC SP CAL42524306DLL MSFL GR CAL38004301LDL CNL GR CAL10002054LDL CNL NGS CAL20424308MWD - GR SN RES DIR2444206RFT GR39264288RFT GR39264288SHDT FMS20424306VSP2442320 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30405.036413.00.00LOTSURF.COND.201000.0261025.01.67LOTINTERM.13 3/82041.017 1/22053.01.83LOTOPEN HOLE4306.012 1/44306.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3141.04WATER BASED05.05.19874001.06WATER BASED14.12.19874051.06WATER BASED16.12.19874101.08WATER BASED06.05.19874101.08WATER BASED07.05.19874811.06WATER BASED17.12.19875231.051000.0WATER BASED11.05.19875961.051000.0WATER BASED11.05.19875961.03WATER BASED12.05.19877531.352900.06.7WATER BASED14.05.19878031.06WATER BASED18.12.198711551.211100.06.3WATER BASED14.05.198711641.5812.033.5WATER BASED04.01.198813131.5812.041.2WATER BASED04.01.198814671.211000.05.9WATER BASED18.05.198716341.6012.046.9WATER BASED04.01.198818151.6115.047.4WATER BASED04.01.198819601.25900.05.9WATER BASED18.05.198720281.6125.016.3WATER BASED04.01.198820531.6121.011.5WATER BASED07.01.198820531.6818.05.8WATER BASED12.01.198820531.6231.016.7WATER BASED05.01.198820531.6130.021.1WATER BASED06.01.198820811.451800.05.5WATER BASED18.05.198722131.6830.07.7WATER BASED12.01.198822181.451900.05.5WATER BASED19.05.198722181.451900.06.3WATER BASED18.05.198722181.451400.05.5WATER BASED20.05.198722211.6825.06.2WATER BASED12.01.198822211.6827.08.6WATER BASED12.01.198822211.6835.07.7WATER BASED14.01.198823511.6835.09.6WATER BASED14.01.198823701.6836.019.6WATER BASED15.01.198823701.6821.013.4WATER BASED25.01.198823701.6828.08.1WATER BASED19.01.198823701.6823.011.5WATER BASED19.01.198823701.6823.07.7WATER BASED20.01.198823701.6824.012.0WATER BASED20.01.198823701.6823.011.0WATER BASED21.01.198823701.6819.010.5WATER BASED25.01.198823701.6822.09.6WATER BASED25.01.198827301.6827.07.7WATER BASED19.01.198836001.6823.010.1WATER BASED25.01.198836121.6820.011.5WATER BASED26.01.198836701.6818.031.1WATER BASED27.01.198837191.689.028.7WATER BASED02.02.198837191.6917.011.0WATER BASED02.02.198837191.685.447.4WATER BASED28.01.198837191.6816.013.4WATER BASED29.01.198837191.6811.014.4WATER BASED02.02.198837191.6910.024.9WATER BASED02.02.198837191.6816.011.5WATER BASED03.02.198837191.6816.08.6WATER BASED04.02.198837191.6814.020.6WATER BASED05.02.198837191.7216.020.1WATER BASED09.02.198837191.7217.017.2WATER BASED09.02.198837191.7217.017.7WATER BASED12.02.198837191.7214.018.7WATER BASED12.02.198837191.7214.017.7WATER BASED12.02.198837191.7213.011.5WATER BASED12.02.198837191.7213.014.4WATER BASED15.02.198837191.7212.015.8WATER BASED15.02.198837191.7214.09.6WATER BASED15.02.198837191.7214.0WATER BASED15.02.198837191.7211.05.8WATER BASED16.02.198837191.7213.013.9WATER BASED17.02.198837191.7212.012.0WATER BASED18.02.198837191.7216.07.2WATER BASED19.02.198837191.7215.07.7WATER BASED22.02.198837191.7215.07.7WATER BASED22.02.198837191.7214.07.2WATER BASED22.02.198837191.7214.07.2WATER BASED23.02.198843061.7214.07.2WATER BASED26.02.1988