6201/11-2
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General information
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Wellbore history
GeneralWell 6201/11-2 was designed to drill the Oksen prospect in the southwestern corner of block 6201/11. A prominent NE-SW trending ridge complex occupies the southern part of this block, separating the Møre Basin from the northern North Sea along the Møre Trøndelag fault complex. The reservoir rocks of the Oksen prospect were interpreted as synrift submarine fan deposits of Kimmeridge age located in a half graben between two Triassic Highs. Trapping mechanism were stratigraphically dependant on sealing faults towards rotated Triassic rocks in southeast. The objectives of the well were to test the hydrocarbon and reservoir potential of the Late Jurassic play-concept (Magnus Sand) and to test the geophysical and structural interpretation of the area and give valuable information on palaeontology and geochemistry.Shallow gas warnings were given for two levels.Operations and resultsWildcat well 6201/11-02 was spudded with the semi-submersible rig Deepsea Bergen on 8 January 1991 and drilled to TD at a total depth of 3778 m in the Jurassic Heather Formation. The well was drilled with seawater/CMC/viscous plugs down to 780 m, with KCl/polymer mud from 780 m to 3335 m, and with gel/lignosulfonate mud from 3335 m to TD. The well was drilled without major problems, except for 3 days lost rig-time due to low leak-off value at the 20" casing shoe.Top Late Jurassic was encountered at 3339 m, which is 24 m lower than prognosed. No potential reservoir rocks were encountered in the Late/Middle Jurassic. The biostratigraphic breakdown was difficult to interpret from approximately 3650 m and to TD with Triassic shale overlying the Late Jurassic Heather Formation towards TD. It is thus possible that the Jurassic and Triassic sequences in this well represent slumped/slided sediment packages similar to the situation in well 33/5-2 not very far to the south. The only shows recorded were cut fluorescence in claystones in the interval 3350 m to 3712 m. One conventional core was cut in the interval 3697-3712 m. No fluid samples were attempted. A total of 100 sidewall cores were attempted, 77 were recovered. The well was permanently abandoned on 12 March 1991 as a dry well.TestingNo drill stem test was performed -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]790.003776.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13697.03710.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]13.9Cores 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 typeLaboratory1200.0[m]DCGEOCH1210.0[m]DCGEOCH1230.0[m]DCGEOCH1240.0[m]DCGEOCH1260.0[m]DCGEOCH1280.0[m]DCGEOCH1300.0[m]DCGEOCH1320.0[m]DCGEOCH1340.0[m]DCGEOCH1360.0[m]DCGEOCH1370.0[m]DCGEOCH1380.0[m]DCGEOCH1400.0[m]DCGEOCH1420.0[m]DCGEOCH1430.0[m]DCGEOCH1450.0[m]DCGEOCH1460.0[m]DCGEOCH1480.0[m]DCGEOCH1490.0[m]DCGEOCH1500.0[m]DCGEOCH1520.0[m]DCGEOCH1530.0[m]DCGEOCH1540.0[m]DCGEOCH1560.0[m]DCGEOCH1570.0[m]DCGEOCH1590.0[m]DCGEOCH1620.0[m]DCGEOCH1640.0[m]DCGEOCH1660.0[m]DCGEOCH1680.0[m]DCGEOCH1700.0[m]DCGEOCH1720.0[m]DCGEOCH1740.0[m]DCGEOCH1760.0[m]DCGEOCH1780.0[m]DCGEOCH1800.0[m]DCGEOCH1845.0[m]SWCSTATO1905.0[m]SWCSTATO1910.0[m]DCGEOCH2065.0[m]SWCSTATO2095.0[m]SWCSTATO2120.0[m]DCGEOCH2140.0[m]DCGEOCH2150.0[m]SWCSTATO2170.0[m]DCGEOCH2190.0[m]DCGEOCH2210.0[m]DCGEOCH2220.0[m]DCGEOCH2230.0[m]DCGEOCH2240.0[m]DCGEOCH2248.0[m]SWCSTATO2270.0[m]DCGEOCH2290.0[m]DCGEOCH2310.0[m]DCGEOCH2330.0[m]DCGEOCH2350.0[m]SWCSTATO2370.0[m]DCGEOCH2390.0[m]DCGEOCH2410.0[m]DCGEOCH2430.0[m]DCGEOCH2450.0[m]DCGEOCH2470.0[m]DCGEOCH2490.0[m]DCGEOCH2500.0[m]DCGEOCH2510.0[m]DCGEOCH2520.0[m]DCGEOCH2530.0[m]DCGEOCH2550.0[m]DCGEOCH2570.0[m]DCGEOCH2590.0[m]DCGEOCH2610.0[m]DCGEOCH2630.0[m]DCGEOCH2710.0[m]DCGEOCH2725.0[m]SWCSTATO2740.0[m]DCGEOCH2750.0[m]DCGEOCH2760.0[m]SWCSTATO2780.0[m]DCGEOCH2819.0[m]SWCSTATO2850.0[m]SWCSTATO2860.0[m]DCGEOCH2880.0[m]SWCSTATO2900.0[m]DCGEOCH2910.0[m]SWCSTATO2930.0[m]DCGEOCH2960.0[m]DCGEOCH2970.0[m]SWCSTATO2990.0[m]DCGEOCH3000.0[m]DCGEOCH3010.0[m]DCGEOCH3040.0[m]DCGEOCH3080.0[m]DCGEOCH3100.0[m]DCGEOCH3130.0[m]DCGEOCH3170.0[m]DCGEOCH3200.0[m]DCGEOCH3210.0[m]SWCSTATO3224.0[m]DCGEOCH3230.0[m]DCGEOCH3242.0[m]DCGEOCH3251.0[m]DCGEOCH3260.0[m]DCGEOCH3281.0[m]DCGEOCH3290.0[m]DCGEOCH3302.0[m]DCGEOCH3311.0[m]DCGEOCH3320.0[m]DCGEOCH3330.0[m]SWCSTATO3335.0[m]SWCSTATO3337.0[m]SWCSTATO3339.5[m]SWCSTATO3347.0[m]DCGEOCH3360.0[m]SWCSTATO3365.0[m]SWCSTATO3374.0[m]DCGEOCH3385.5[m]SWCSTATO3392.0[m]DCGEOCH3401.0[m]DCGEOCH3413.5[m]SWCSTATO3419.0[m]DCGEOCH3428.0[m]DCGEOCH3437.0[m]DCGEOCH3446.5[m]SWCSTATO3455.0[m]DCGEOCH3466.5[m]SWCSTATO3473.0[m]DCGEOCH3485.0[m]DCGEOCH3491.0[m]DCGEOCH3501.0[m]SWCSTATO3512.0[m]SWCSTATO3521.0[m]SWCSTATO3533.0[m]DCGEOCH3543.0[m]SWCSTATO3547.5[m]SWCSTATO3560.0[m]DCGEOCH3569.0[m]DCGEOCH3578.0[m]DCGEOCH3593.0[m]SWCSTATO3605.0[m]DCGEOCH3623.0[m]DCGEOCH3638.0[m]SWCSTATO3644.0[m]DCGEOCH3650.5[m]SWCSTATO3663.5[m]SWCSTATO3668.5[m]SWCSTATO3671.0[m]DCGEOCH3678.0[m]SWCSTATO3687.5[m]SWCSTATO3697.1[m]CSTATO3697.2[m]CSTATO3697.7[m]CSTATO3698.0[m]CSTATO3698.8[m]CSTATO3722.0[m]DCGEOCH3728.5[m]SWCSTATO3733.0[m]SWCSTATO3739.5[m]SWCSTATO3770.0[m]DCGEOCH3776.0[m]DCGEOCH -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3961200122418151909204220422220333933393544366836683697369737263726 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.54 -
Geochemical information
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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]pdf9.19 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR3813319CBL VDL GR5501727CDL CNL GR33193766CDL GR3511723CDL GR17273332CST17313335CST33343762DIFL ACL GR SP CAL3511723DIFL ACL GR SP CAL17273332DIFL ACL GR SP CAL33193766DIPLOG33193762FMT GR33603737MWD - DIR7853122MWD - DPR459785MWD - DPR31223778VSP6003750 -
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 typeCONDUCTOR30454.036455.00.00LOTINTERM.20774.026775.01.30LOTINTERM.13 3/81731.017 1/21732.01.70LOTINTERM.9 5/83326.012 1/43327.01.94LOTOPEN HOLE3778.08 1/23778.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured10301.2014.05.0WATER BASED28.01.199111001.2014.05.0WATER BASED28.01.199112141.2014.05.0WATER BASED28.01.199116971.2521.06.0WATER BASED28.01.199117151.2520.06.5WATER BASED30.01.199117461.3021.05.0WATER BASED04.02.199117461.3020.05.0WATER BASED04.02.199117461.2720.06.5WATER BASED30.01.199117461.2922.05.5WATER BASED30.01.199117491.3020.05.0WATER BASED04.02.199120601.5528.07.5WATER BASED04.02.199120601.5536.05.5WATER BASED05.02.199120601.5524.07.0WATER BASED07.02.199120601.5522.07.0WATER BASED07.02.199120601.5527.07.5WATER BASED11.02.199120601.5526.07.0WATER BASED13.02.199120601.55DUMMY15.02.199120601.55DUMMY15.02.199121041.5528.07.5WATER BASED04.02.199121201.5536.05.5WATER BASED05.02.199123541.5524.07.0WATER BASED07.02.199125421.5522.07.0WATER BASED07.02.199125851.5527.07.5WATER BASED11.02.199127601.55DUMMY15.02.199127601.5526.07.0WATER BASED13.02.199127601.55DUMMY15.02.199127601.5528.08.5WATER BASED19.02.199129631.5526.07.0WATER BASED13.02.199130531.55DUMMY15.02.199130801.55DUMMY15.02.199133351.5528.08.5WATER BASED19.02.199133651.5018.04.0WATER BASED26.02.199133651.5421.04.0WATER BASED28.02.199133651.5423.03.5WATER BASED04.03.199133651.5423.03.0WATER BASED04.03.199133651.5422.03.0WATER BASED04.03.199133651.5423.04.5WATER BASED28.02.199133651.5422.03.0WATER BASED05.03.199133781.5423.03.0WATER BASED04.03.199133781.5018.05.5WATER BASED26.02.199134591.5020.04.5WATER BASED26.02.199134831.5018.04.0WATER BASED26.02.199136771.5423.04.5WATER BASED28.02.199136971.5421.04.0WATER BASED28.02.199137781.5422.03.0WATER BASED04.03.199137781.5423.03.5WATER BASED04.03.199137781.5422.03.0WATER BASED05.03.1991