7117/9-2
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General information
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Wellbore history
GeneralExploration well 7117/9-2 is located on the Senja Ridge west of the Tromsø Basin. The primary objective of wildcat 7117/9-2 was to test sandstone or limestone reservoirs of Early Cretaceous age in a well-defined offset bounded structure within the Senja Ridge (the Lom structure). An alternative model suggested that the primary objective was sandstones of Middle Jurassic age and the secondary objectives were sandstone reservoirs of Triassic age or older. The well was planned to be drilled to a total depth of 5000 m and serve as the deep commitment well on the block.Operations and results7117/9-2 was spudded with the semi-submersible installation Treasure Scout on 7 May 1983 and drilled to a total depth of 5000 m in Early Cretaceous (?Aptian) clay stone. Nineteen rig days were lost due to strike, otherwise no major problems occurred during drilling of this well. The well was drilled with seawater and hi-vis pills down to 358 m. with seawater and bentonite from 358 m to 915 m, and with gypsum / polymer from 915 m to 2500 m. From 2500 m the mud was dispersed to a lignosulphonate mud, which was used for the remaining well down to TD.Pleistocene deposits were encountered down to 400 m and underlain by a thick sequence of Pliocene clays down to 1092 m. Paleocene rocks continued down to 1345 m followed by a thin sequence of Campanian (1380 m to1396 m) and Late Albian to Early Cenomanian (1400? - 1410) deposits. The lowermost strata penetrated by the well consisted of a thick, poorly defined sequence of claystones. The upper sequence from 1625 m to 3440 m is of Albian to Aptian age. In the lower section, few identifiable fossils were recorded and preservation was poor. The Lom structure was penetrated in a down flank position at approximately 3375 m. The structure proved to consist of Early Cretaceous silty claystones of probable Aptian age and bounded by fractured dolomites. No rocks with reservoir properties were encountered in the well.Poor hydrocarbon shows were reported in siltstones of Early Albian to Late Aptian age between 3030 and 3047 m. Geochemical analysis carried out in the well indicates that oil window maturity occurred between 3000 m to3340 m and that the well was in the condensate to gas window maturity at TD. The Early Cretaceous claystones were evaluated to have a poor to fair potential as source rock for gas.Four cores were cut in the Early Cretaceous sequence (3475 m to 3481 m, 3676 m to 3680 m, 4378 m to 4394.5 m, and 4860 m to 4876 m). No fluid samples were collected.The well was permanently abandoned on 9 September 1983 as a dry hole.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]360.005000.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13475.03478.3[m ]23676.03680.0[m ]34378.04394.1[m ]44860.04872.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]35.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30356.036360.00.00LOTSURF.COND.20903.026912.00.00LOTINTERM.13 3/81995.017 1/22010.01.78LOTINTERM.9 5/83681.012 1/43697.01.89LOTOPEN HOLE5000.08 3/85000.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL8001950CBL VDL19853677CST10251695CST20162760CST27953680CST37024138CST41504603CST46194997HDT8991868HDT8991699HDT19893236ISF LSS GR SP3535001LDT CNL GR CAL3535002SHDT19893679SHDT36774975VSP4473240VSP4475002 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit294109210921375137513931393 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.88 -
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]pdf11.08 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3581.25WATER BASED12001.1553.0WATER BASED19401.3058.0WATER BASED22401.3158.0WATER BASED31311.3763.0WATER BASED36351.4556.0WATER BASED47371.5160.0WATER BASED50001.5155.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory900.0[m]DCOD910.0[m]DCOD920.0[m]DCOD930.0[m]DCOD940.0[m]DCOD950.0[m]DCOD960.0[m]DCOD970.0[m]DCOD980.0[m]DCOD990.0[m]DCOD1000.0[m]DCOD1010.0[m]DCOD1020.0[m]DCOD1025.0[m]SWCIKU1089.0[m]SWCIKU1105.0[m]SWCIKU1113.0[m]SWCIKU1125.0[m]SWCIKU1132.0[m]SWCIKU1140.0[m]DCOD1170.0[m]DCOD1200.0[m]DCOD1230.0[m]DCOD1260.0[m]DCOD1290.0[m]DCOD1320.0[m]DCOD1340.0[m]SWCIKU1350.0[m]DCOD1385.0[m]SWCIKU1392.0[m]SWCIKU1396.0[m]SWCIKU1414.0[m]SWCIKU1446.0[m]SWCIKU1458.0[m]SWCIKU1492.0[m]SWCIKU1521.0[m]SWCIKU1640.0[m]SWCIKU1654.0[m]SWCIKU1675.0[m]SWCIKU1695.0[m]SWCIKU1700.0[m]DCOD1730.0[m]DCOD1760.0[m]DCOD1790.0[m]DCOD1820.0[m]DCOD1850.0[m]DCOD1880.0[m]DCOD1910.0[m]DCOD1940.0[m]DCOD1970.0[m]DCOD2000.0[m]DCOD2016.0[m]SWCIKU2030.0[m]DCOD2060.0[m]DCOD2090.0[m]DCOD2100.0[m]DCOD2169.5[m]SWCIKU2202.0[m]SWCIKU2305.0[m]SWCIKU2341.0[m]SWCIKU2367.5[m]SWCIKU2474.5[m]SWCIKU2507.0[m]SWCIKU2529.5[m]SWCIKU2559.5[m]SWCIKU2599.0[m]SWCIKU2655.5[m]SWCIKU2706.0[m]SWCIKU2720.5[m]SWCIKU2760.0[m]SWCIKU2795.0[m]SWCIKU2823.0[m]SWCIKU2845.5[m]SWCIKU2891.0[m]SWCIKU2915.5[m]SWCIKU2952.0[m]SWCIKU2997.5[m]SWCIKU3042.0[m]SWCIKU3084.0[m]SWCIKU3125.5[m]SWCIKU3139.0[m]SWCIKU3169.5[m]SWCIKU3203.0[m]SWCIKU3240.0[m]SWCIKU3273.0[m]SWCIKU3293.0[m]SWCIKU3325.0[m]SWCIKU3345.0[m]SWCIKU3365.0[m]SWCIKU3415.0[m]DCOD3417.0[m]DCOD3440.0[m]SWCIKU3552.0[m]SWCIKU3633.5[m]SWCIKU3650.5[m]SWCIKU3676.0[m]CIKU3679.0[m]CIKU3679.2[m]COD3680.0[m]SWCIKU3702.0[m]SWCIKU3708.0[m]SWCIKU3724.5[m]SWCIKU3733.5[m]SWCIKU3740.0[m]SWCIKU3756.0[m]SWCIKU3773.0[m]SWCIKU3788.5[m]SWCIKU3812.5[m]SWCIKU3829.0[m]SWCIKU3848.0[m]SWCIKU3851.5[m]SWCIKU3869.5[m]SWCIKU3889.0[m]SWCIKU3895.0[m]SWCIKU3917.5[m]SWCIKU3929.5[m]SWCIKU3948.5[m]SWCIKU3966.5[m]SWCIKU3984.0[m]SWCIKU4001.5[m]SWCIKU4020.0[m]SWCIKU4032.0[m]SWCIKU4045.5[m]SWCIKU4060.0[m]SWCIKU4075.0[m]SWCIKU4100.0[m]SWCIKU4121.0[m]SWCIKU4138.0[m]SWCIKU4150.5[m]SWCIKU4162.0[m]SWCIKU4177.5[m]SWCIKU4192.0[m]SWCIKU4211.5[m]SWCIKU4228.5[m]SWCIKU4250.0[m]SWCIKU4258.5[m]SWCIKU4276.0[m]SWCIKU4290.0[m]SWCIKU4310.0[m]SWCIKU4326.5[m]SWCIKU4361.5[m]SWCIKU4379.9[m]CIKU4380.0[m]CIKU4381.5[m]SWCIKU4381.9[m]CIKU4384.0[m]CIKU4386.0[m]CIKU4387.0[m]CIKU4388.1[m]CIKU4390.0[m]CIKU4392.0[m]CIKU4393.0[m]CIKU4398.0[m]SWCIKU4410.5[m]SWCIKU4423.0[m]SWCIKU4436.0[m]SWCIKU4459.0[m]SWCIKU4467.0[m]SWCIKU4479.5[m]SWCIKU4495.0[m]SWCIKU4510.0[m]SWCIKU4526.0[m]SWCIKU4548.0[m]SWCIKU4563.0[m]SWCIKU4576.5[m]SWCIKU4594.0[m]SWCIKU4603.0[m]SWCIKU4620.0[m]SWCIKU4648.0[m]SWCIKU4665.0[m]SWCIKU4682.0[m]SWCIKU4693.0[m]SWCIKU4706.5[m]SWCIKU4717.5[m]SWCIKU4736.0[m]SWCIKU4746.0[m]SWCIKU4754.0[m]SWCIKU4770.0[m]SWCIKU4785.5[m]SWCIKU4798.0[m]SWCIKU4811.0[m]SWCIKU4813.5[m]SWCIKU4834.0[m]SWCIKU4856.5[m]SWCIKU4860.0[m]COD4860.1[m]CIKU4862.5[m]CIKU4863.5[m]COD4864.7[m]COD4864.9[m]CIKU4865.4[m]CIKU4866.0[m]SWCIKU4866.6[m]CIKU4867.1[m]CIKU4867.6[m]COD4868.2[m]CIKU4869.0[m]CIKU4869.1[m]CIKU4869.4[m]COD4870.5[m]CIKU4870.9[m]COD4871.5[m]CIKU4872.0[m]CIKU4914.0[m]SWCIKU4925.5[m]SWCIKU4967.5[m]SWCIKU4978.0[m]SWCIKU4980.0[m]SWCIKU4992.5[m]SWCIKU4997.0[m]SWCIKU