30/12-1
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General information
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Wellbore history
GeneralWell 30/12-1 is located ca 12 km south of the 30/9-16 discovery well on the Oseberg Field complex. It was drilled to reduce uncertainties about hydrocarbon migration in the eastern part of the block. The primary objectives of the well were to test the hydrocarbon potential of the Middle Jurassic Tarbert Formation with the Ness-Oseberg-Rannoch-Etive Formations and the Early Jurassic Cook and Statfjord Formations.Operations and resultsExploration well 30/12-1 was spudded with the semi-submersible installation "West Vanguard" on 6 January 1994 and drilled to TD at 3641 m in the Early Jurassic Statfjord Formation. The well was drilled with seawater and bentonite hi-vis sweeps down to 1130 m and with "ANCO 2000" mud from 1130 m to TD.The Tarbert Formation was penetrated at 2903 m and was found to be 86 m thick in this well. The Brent Group, the Cook Formation, and the Statfjord Formation were found to be water bearing. Three conventional cores with 65 to 99 % recovery were cut in sandstone with thin coal beds in the interval 2901 m to 2970 m. Core number 1 included the lowermost two metres of the Heather Formation, otherwise all cores were cut in the Tarbert Formation. No fluid samples were taken. The well was permanently abandoned as a dry well on 7 March 1994.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]1140.003640.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12901.02927.2[m ]22927.62960.1[m ]32961.02966.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]64.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30219.036219.00.00LOTSURF.COND.13 3/81120.017 1/21122.00.00LOTINTERM.9 5/82802.012 1/42804.00.00LOTOPEN HOLE3641.08 1/23641.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST13562836CST13562836CST28653613DIL SDL/LSS GR SP AMS2201125DLL MSFL SDT LDL CNL GR SP AMS10152843DLL MSFL SDT/LSS GR SP AMS28093643LDL CNL FMS GR AMS28043643MWD RGD - GR RES DIR1363580RFT29123619VSP2002750VSP26003630 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit13564877289921362156215622052270241624292429254426102622262226932712279527952852290329032989313331333409341735493596 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.71 -
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]pdf22.01 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1851.4117.0WATER BASED2201.05WATER BASED7081.05WATER BASED10061.4517.0WATER BASED11301.20WATER BASED17691.4533.0WATER BASED18951.4527.0WATER BASED21511.3934.0WATER BASED23171.3932.0WATER BASED25001.4527.0WATER BASED25581.4521.0WATER BASED26481.4522.0WATER BASED27111.4523.0WATER BASED27911.4524.0WATER BASED28421.4524.0WATER BASED29611.2320.0WATER BASED29961.2018.0WATER BASED33151.2019.0WATER BASED35851.2115.0WATER BASED36411.2318.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1140.0[m]DCHYDRO1160.0[m]DCHYDRO1180.0[m]DCHYDRO1200.0[m]DCHYDRO1220.0[m]DCHYDRO1240.0[m]DCHYDRO1260.0[m]DCHYDRO1280.0[m]DCHYRDRO1300.0[m]DCHYDRO1320.0[m]DCHYDRO1340.0[m]DCHYDRO1356.0[m]SWCHYDRO1360.0[m]DCHYDRO1380.0[m]DCHYDRO1400.0[m]DCHYDRO1420.0[m]DCHYDRO1440.0[m]DCHYDRO1460.0[m]DCHYDRO1491.0[m]SWCHYDRO1500.0[m]DCHYDRO1520.0[m]DCHYDRO1540.0[m]DCHYDRO1560.0[m]DCHYDRO1580.0[m]SWCHYDRO1600.0[m]DCHYDRO1620.0[m]DCHYDRO1640.0[m]DCHYDRO1660.0[m]DCHYDRO1680.0[m]DCHYDRO1700.0[m]DCHYDRO1723.0[m]SWCHYDRO1740.0[m]DCHYDRO1760.0[m]DCHYDRO1780.0[m]DCHYDRO1800.0[m]DCHYDRO1816.0[m]SWCHYDRO1840.0[m]DCHYDRO1860.0[m]DCHYDRO1880.0[m]DCHYDRO1900.0[m]DCHYDRO1917.0[m]SWCHYDRO1940.0[m]DCHYDRO1960.0[m]DCHYDRO1980.0[m]DCHYDRO2020.0[m]DCHYDRO2040.0[m]DCHYDRO2060.0[m]DCHYDRO2080.0[m]DCHYDRO2095.0[m]SWCHYDRO2157.0[m]SWCHYDRO2209.0[m]SWCHYDRO2235.0[m]SWCHYDRO2253.0[m]SWCHYDRO2280.0[m]DCHYDRO2302.0[m]SWCHYDRO2320.0[m]DCHYDRO2340.0[m]DCHYDRO2360.0[m]DCHYDRO2380.0[m]DCHYDRO2400.0[m]DCHYDRO2420.0[m]SWCHYDRO2420.0[m]DCHYDRO2440.0[m]DCHYDRO2460.0[m]DCHYDRO2480.0[m]DCHYDRO2520.0[m]DCHYDRO2550.0[m]DCHYDRO2560.0[m]DCHYDRO2610.0[m]DCHYDRO2620.0[m]DCHYDRO2630.0[m]DCHYDRO2640.0[m]DCHYDRO2650.0[m]DCHYDRO2660.0[m]DCHYDRO2670.0[m]DCHYDRO2690.0[m]DCHYDRO2705.0[m]DCHYDRO2710.0[m]DCHYDRO2730.0[m]DCHYDRO2740.0[m]DCHYDRO2750.0[m]DCHYDRO2762.0[m]DCHYDRO2770.0[m]DCHYDRO2787.0[m]DCHYDRO2796.0[m]SWCHYDRO2805.0[m]DCHYDRO2812.0[m]SWCHYDRO2820.0[m]SWCHYDRO2822.0[m]DCHYDRO2830.0[m]SWCHYDRO2836.0[m]SWCHYDRO2842.0[m]DCHYDRO2850.0[m]DCHYDRO2857.0[m]DCHYDRO2865.0[m]SWCHYDRO2875.0[m]SWCHYDRO2886.0[m]SWCHYDRO2897.5[m]SWCHYDRO2918.3[m]CHYDRO2921.7[m]CHYDRO2944.0[m]CHYDRO2944.1[m]CUNIV.SHE2955.9[m]CHYDRO2960.0[m]CHYDRO2961.3[m]CHYDRO2967.0[m]CHYDRO2992.5[m]SWCHYDRO3001.0[m]SWCHYDRO3010.5[m]SWCHYDRO3020.0[m]SWCHYDRO3029.5[m]SWCHYDRO3037.0[m]DCHYDRO3042.0[m]SWCHYDRO3050.0[m]DCHYDRO3057.0[m]DCHYDRO3078.0[m]SWCHYDRO3080.0[m]DCHYDRO3085.0[m]SWCHYDRO3090.0[m]SWCHYDRO3111.5[m]SWCHYDRO3135.0[m]SWCHYDRO3146.0[m]SWCHYDRO3155.0[m]DCHYDRO3165.0[m]DCHYDRO3175.0[m]DCHYDRO3185.0[m]SWCHYDRO3190.0[m]DCHYDRO3200.0[m]DCHYDRO3210.0[m]DCHYDRO3220.0[m]DCHYDRO3230.0[m]DCHYDRO3240.0[m]DCHYDRO3250.0[m]DCHYDRO3260.0[m]DCHYDRO3270.0[m]DCHYDRO3270.0[m]SWCHYDRO3280.0[m]DCHYDRO3290.0[m]DCHYDRO3300.0[m]DCHYDRO3310.0[m]DCHYDRO3320.0[m]DCHYDRO3330.0[m]DCHYDRO3340.0[m]DCHYDRO3350.0[m]DCHYDRO3360.0[m]DCHYDRO3370.0[m]DCHYDRO3380.0[m]DCHYDRO3390.0[m]DCHYDRO3400.0[m]SWCHYDRO3410.0[m]DCHYDRO3420.0[m]DCHYDRO3428.0[m]SWCHYDRO3440.0[m]DCHYDRO3450.0[m]DCHYDRO3460.0[m]DCHYDRO3470.0[m]DCHYDRO3480.0[m]DCHYDRO3490.0[m]DCHYDRO3500.0[m]DCHYDRO3510.0[m]DCHYDRO3520.0[m]DCHYDRO3530.0[m]DCHYDRO3542.0[m]SWCHYDRO3550.0[m]DCHYDRO3557.0[m]DCHYDRO3567.0[m]DCHYDRO3580.0[m]DCHYDRO3590.0[m]DCHYDRO3600.0[m]DCHYDRO3613.5[m]SWCHYDRO3620.0[m]DCHYDRO3630.0[m]DCHYDRO3640.0[m]DCHYDRO