6507/6-2
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General information
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Wellbore history
GeneralWell 6507/6-2 was drilled in the north-western corner of the block on a rotated fault block on the Dønna Terrace, immediately northwest of the main fault zone separating the Dønna Terrace from the Nordland Ridge. The main objective of the well 6507/6-2 was to test the hydrocarbon potential in the Fangst Group and in the Tilje Formation. A secondary target was to test the reservoir properties and hydrocarbon potential of a Cretaceous dome shaped structure interpreted to be a potential Lysing Formation Equivalent. The source rock properties in the Spekk and Åre Formations would be tested by the well. The commitment was to drill at least 50 m into rocks of Triassic age; with planned TD at 4200 m. No shallow gas warnings were given for this well.Operations and resultsWildcat well 6507/6-2 was spudded with the semi-submersible installation West Alpha on 27 April 1991and drilled to TD at 4345 m (4343 m TVD RKB) in Late Triassic sediments of the Åre Formation. Only minor problems occurred while drilling. The well was drilled with spud mud down to 1040 m, with KCl mud from 1040 m to 3413 m, and with Hi-Temp polymer mud from 3413 m to TD.The well mainly penetrated claystones with minor silt and sandstone intervals down to Top Cromer Knoll Group at 2663 m. In the Cromer Knoll Group the lithology was mainly claystone with thin intervals of sandstone and limestone. The reservoir in the Fangst Group was reached at 3727 m, 336 m deeper than prognosed and proved to be dry. However, oil was found in a thin sand bed in the Lange Formation (Turonian age) at 2754 - 2757 m. This sand was neither cored nor production tested, but oil was recovered by RFT sampling.Sporadic shows were recorded in thin sandstone stringers at several levels in the Lange Formation (2745 to 2753 m, 2885 m, 2945 - 2955 m, and 2946 m). The well encountered a 102 m thick Spekk Formation sequence at 3174 m. The Spekk Formation had excellent hydrocarbon potential with TOC in the range 6 - 8%, and Hydrogen Index in the range 320 to 475 mg HC/g TOC. The highest HI was in the uppermost part of the formation. Shale samples from the Åre Formation had limited source rock potential with TOC around 2.4 % and HI around 100 mg/g HC.Two conventional cores were cut in the Garn Formation between 3727 to 3740 m. A total of 180 sidewall cores were attempted and 130 were recovered. After having evaluated the wire line logs, it was decided to take fluid samples at 2754.5 and 2886.5 m in the Lange Formation. A segregated sample was taken at 2754.5 m where 178 litre gas, 890 ml oil, and 100 ml water was recovered. Density of the dead oil (stock tank conditions) was 0.8322 g/cm3. It was not possible to get a sample at 2886.5 m.The well was permanently abandoned on 16 July 1991 as a well with oil shows.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]1060.004354.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13727.03732.2[m ]23732.23739.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]12.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableRFTRFT-2A2754.502886.5008.06.1991 - 00:00YES -
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 typeCONDUCTOR30405.036406.00.00LOTINTERM.201040.0261042.01.69LOTINTERM.13 3/82029.017 1/22030.01.67LOTINTERM.9 5/83309.012 1/43310.01.99LOTOPEN HOLE3325.08 1/23326.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL18753308CBL VDL GR8002026DIL MSFL SLS GR AMS33074287DIL SLS GR42024343DIL SLS LDL CNL GR20273323DIL SLS LDL GR10382044LDL CNL GR33074260MWD - GR RES DIR4114354RFT20542886RFT AMS GR37283968SHDT GR33074277VSP10004270 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit333333139518181818198119812039209226632663315431743174327637273727378138123853385339044014 -
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]pdf17.86 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3361.05WATER BASED30.04.19913361.05WATER BASED30.04.19913361.05WATER BASED02.05.19913361.05WATER BASED03.05.19913361.05WATER BASED03.05.19913361.05WATER BASED03.05.19913361.05WATER BASED03.05.19913361.05WATER BASED03.05.19913361.05WATER BASED03.05.19917301.4416.07.0WATER BASED16.07.199110551.05WATER BASED06.05.199110551.05WATER BASED06.05.199110551.05WATER BASED06.05.199113501.3216.017.0WATER BASED13.05.199114871.3516.018.0WATER BASED13.05.199118481.4536.025.0WATER BASED13.05.199119061.4413.011.0WATER BASED16.07.199120501.5521.024.0WATER BASED14.05.199120501.5520.020.0WATER BASED22.05.199120501.5520.018.0WATER BASED14.05.199120501.5521.024.0WATER BASED14.05.199120501.5520.020.0WATER BASED15.05.199120501.5520.017.0WATER BASED16.05.199120501.5514.021.0WATER BASED21.05.199120561.5520.017.0WATER BASED22.05.199122851.5222.014.0WATER BASED22.05.199122851.5522.016.0WATER BASED22.05.199122951.5222.016.0WATER BASED22.05.199123961.5220.019.0WATER BASED23.05.199125311.5214.016.0WATER BASED24.05.199125311.5215.016.0WATER BASED27.05.199125311.5215.016.0WATER BASED28.05.199125481.5215.014.0WATER BASED28.05.199125481.5215.014.0WATER BASED30.05.199125731.5216.015.0WATER BASED30.05.199125731.5216.015.0WATER BASED28.05.199126941.5215.016.0WATER BASED28.05.199126941.5215.016.0WATER BASED30.05.199127271.5322.015.0WATER BASED30.05.199128151.5219.015.0WATER BASED30.05.199129071.5219.016.0WATER BASED30.05.199129071.5418.015.0WATER BASED04.06.199129071.5417.018.0WATER BASED03.06.199129941.5419.016.0WATER BASED04.06.199130131.5421.017.0WATER BASED04.06.199131111.5420.017.0WATER BASED05.06.199131691.5421.016.0WATER BASED07.06.199132171.5520.018.0WATER BASED07.06.199133141.5522.016.0WATER BASED07.06.199133251.5522.014.0WATER BASED11.06.199133251.5521.016.0WATER BASED11.06.199133251.5521.016.0WATER BASED11.06.199133251.5220.016.0WATER BASED11.06.199133271.5221.018.0WATER BASED13.06.199133271.5221.018.0WATER BASED13.06.199134131.5219.013.0WATER BASED17.06.199134601.5221.028.0WATER BASED18.06.199135031.5220.010.0WATER BASED18.06.199136181.5221.012.0WATER BASED18.06.199137221.4514.012.0WATER BASED15.07.199137271.5220.010.0WATER BASED21.06.199137271.5220.010.0WATER BASED19.06.199137321.5221.012.0WATER BASED21.06.199137401.5220.010.0WATER BASED21.06.199138061.5222.013.0WATER BASED21.06.199138491.5221.012.0WATER BASED25.06.199140021.5021.012.0WATER BASED25.06.199140561.4817.010.0WATER BASED25.06.199141001.4518.013.0WATER BASED25.06.199141801.4518.013.0WATER BASED26.06.199141801.4515.013.0WATER BASED28.06.199142731.4518.015.0WATER BASED01.07.199142841.4518.014.0WATER BASED02.07.199142841.4518.014.0WATER BASED02.07.199142961.4517.014.0WATER BASED02.07.199143271.4515.015.0WATER BASED03.07.199143351.4515.018.0WATER BASED03.07.199143431.4516.015.0WATER BASED05.07.199143541.4515.023.0WATER BASED08.07.199143541.4514.09.0WATER BASED09.07.199143541.4516.019.0WATER BASED09.07.199143541.4515.023.0WATER BASED09.07.199143541.4515.023.0WATER BASED09.07.199143541.4517.020.0WATER BASED11.07.199143541.4517.020.0WATER BASED15.07.1991 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1070.0[m]SWCSAGA1090.0[m]DCSAGA1110.0[m]DCSAGA1130.0[m]DCSAGA1150.0[m]DCSAGA1170.0[m]SWCSAGA1190.0[m]DCSAGA1210.0[m]DCSAGA1230.0[m]DCSAGA1250.0[m]DCSAGA1270.0[m]SWCSAGA1290.0[m]DCSAGA1310.0[m]DCSAGA1330.0[m]DCSAGA1370.0[m]SWCSAGA1390.0[m]DCSAGA1410.0[m]DCSTRAT1430.0[m]DCSTRAT1450.0[m]DCSAGA1470.0[m]SWCSAGA1490.0[m]DCSTRAT1510.0[m]DCSTRAT1530.0[m]DCSAGA1550.0[m]SWCSAGA1570.0[m]DCSAGA1590.0[m]DCSAGA1610.0[m]DCSAGA1620.0[m]SWCSAGA1640.0[m]DCSAGA1650.0[m]SWCSAGA1670.0[m]DCSTRAT1680.0[m]SWCSAGA1700.0[m]DCSAGA1720.0[m]DCSAGA1740.0[m]DCSTRAT1760.0[m]DCSAGA1770.0[m]SWCSAGA1790.0[m]DCSTRAT1810.0[m]DCSTRAT1830.0[m]DCSAGA1850.0[m]DCSAGA1890.0[m]DCSAGA1930.0[m]DCSAGA1950.0[m]DCSAGA2000.0[m]DCSAGA2020.0[m]DCSAGA2033.0[m]SWCSAGA2094.0[m]SWCSTRAT2110.0[m]DCSTRAT2116.0[m]SWCSTRAT2130.0[m]DCSTRAT2144.0[m]SWCSTRAT2150.0[m]DCSTRAT2160.0[m]DCSTRAT2170.0[m]DCSTRAT2180.0[m]DCSTRAT2190.0[m]DCSTRAT2200.0[m]DCSTRAT2210.0[m]DCSTRAT2220.0[m]DCSTRAT2230.0[m]DCSTRAT2240.0[m]DCSTRAT2250.0[m]DCSTRAT2260.0[m]DCSTRAT2280.0[m]DCSTRAT2290.0[m]DCSTRAT2300.0[m]DCSTRAT2310.0[m]DCSTRAT2320.0[m]DCSTRAT2330.0[m]DCSTRAT2340.0[m]DCSTRAT2350.0[m]DCSTRAT2360.0[m]DCSTRAT2370.0[m]DCSTRAT2380.0[m]DCSTRAT2390.0[m]DCSTRAT2400.0[m]DCSTRAT2410.0[m]DCSTRAT2420.0[m]DCSTRAT2430.0[m]DCSTRAT2440.0[m]DCSTRAT2450.0[m]DCSTRAT2460.0[m]DCSTRAT2470.0[m]DCSTRAT2480.0[m]DCSTRAT2490.0[m]DCSTRAT2500.0[m]DCSTRAT2510.0[m]DCSTRAT2520.0[m]DCSTRAT2530.0[m]DCSTRAT2540.0[m]DCSTRAT2550.0[m]DCSTRAT2560.0[m]DCSTRAT2570.0[m]DCSTRAT2580.0[m]DCSTRAT2590.0[m]DCSTRAT2610.0[m]DCSTRAT2620.0[m]DCSTRAT2630.0[m]DCSTRAT2640.0[m]DCSTRAT2650.0[m]DCSTRAT2654.0[m]SWCSTRAT2670.0[m]DCSTRAT2680.0[m]DCSTRAT2690.0[m]DCSTRAT2700.0[m]DCSTRAT2710.0[m]DCSTRAT2720.0[m]DCSTRAT2730.0[m]DCSTRAT2740.0[m]DCSTRAT2752.0[m]SWCSTRAT2760.0[m]DCSTRAT2770.0[m]DCSTRAT2780.0[m]DCSTRAT2790.0[m]DCSTRAT2800.0[m]DCSTRAT2810.0[m]DCSTRAT2820.0[m]DCSTRAT2825.0[m]SWCSTRAT2830.0[m]DCSTRAT2840.0[m]DCSTRAT2850.0[m]DCSTRAT2860.0[m]DCSTRAT2870.0[m]DCSTRAT2875.0[m]SWCSTRAT2880.0[m]DCSTRAT2890.0[m]DCSTRAT2900.0[m]DCSTRAT2915.0[m]DCSTRAT2930.0[m]DCSTRAT2940.0[m]DCSTRAT2950.0[m]DCSTRAT2960.0[m]DCSTRAT2972.0[m]SWCSTRAT2980.0[m]DCSTRAT2990.0[m]DCSTRAT3000.0[m]DCSTRAT3010.0[m]DCSTRAT3020.0[m]DCSTRAT3030.0[m]DCSTRAT3090.0[m]DCSTRAT3100.0[m]DCSTRAT3107.5[m]SWCSTRAT3120.0[m]DCSTRAT3130.0[m]DCSTRAT3140.0[m]SWCSTRAT3150.0[m]DCSTRAT3160.0[m]DCSTRAT3167.0[m]SWCSTRAT