7120/5-1
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General information
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Wellbore history
GeneralWildcat well 7120/5-1 was drilled west of the Snøhvit Field on a separate structure, the Alpha structure in the Hammerfest Basin. The main objective of the well was to test possible hydrocarbon accumulations in the Alpha structure of Middle to Lower Jurassic age. A secondary objective was to drill into rocks of upper Triassic age at a prognosed depth of 3047 m.Operations and resultsWell 7120/5-1 was spudded by Smedvigs semi-submersible rig West Vanguard 17 April 1985, and completed 6 June 1985. The well was drilled with spud mud down to 885 m and with gypsum/polymer mud from 885 m to TD. Seventy-four meter below the 20" casing shoe, after the well had penetrated a fault at 954 m, high background gas with heavy components was encountered. The high background gas persisted throughout this section down to the 13 3/8" casing point at 1975 m. Drilling went on without any serious problems.The lithology in the Tertiary and Cretaceous comprises clay with scattered Lime-, Dolomite- and Siltstone layers. The Jurassic Stø Formation was encountered at 2285 m represented by clayey sands, while the clean part of that formation came in at 2341 m. Nordmela Formation was found at 2427 m, and top of Triassic rocks, Fruholmen Formation, came in at 2648 m. Both Stø- and Nordmela Formations were water bearing, but with good oil shows. Geochemical analyses of extracts from this interval showed a waxy oil. In a sandy zone between 2405 m to 2420 m high resistivity values were encountered, but RFT tests and pressure measurements gave negative results. Good source potentials were found in mudstones below ca 1900 m. Shales from 1900 m to 2230 m had TOC in the range 1 % - 3.5 %. A 20 m thick, very organic rich shale with 6 - 19 % TOC was encountered from 2251 m to 2271 m in the Hekkingen Formation. Below this level to TD, frequent claystone interbeds had TOC in the range 0.5 % - 5.5 % in cuttings (up to 13.42 % in a swc from 2351.2 m). The highest hydrogen index was seen in the rich Hekkingen shale (200 - 250 mg/g), which correspond to potential for gas with some oil. Six cores were cut in the interval 2286- 2425.5 m, all in the Stø Formation. Close to all of the Stø Formation was cored. A segregated RFT sample was taken at 2346 m. It recovered water with some gas.The well was permanently abandoned on 6 June 1985 as 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?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]380.002696.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12286.02312.8[m ]22313.02323.1[m ]32323.02351.0[m ]42351.02377.4[m ]52378.02398.0[m ]62398.02424.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]137.9Cores 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 typeLaboratory500.0[m]DCGERH510.0[m]DCGERH520.0[m]DCGERH530.0[m]DCGERH540.0[m]DCGERH550.0[m]DCGERH560.0[m]DCGERH570.0[m]DCGERH580.0[m]DCGERH590.0[m]DCGERH600.0[m]DCGERH610.0[m]DCGERH620.0[m]DCGERH630.0[m]DCGERH640.0[m]DCGERH650.0[m]DCGERH660.0[m]DCGERH670.0[m]DCGERH680.0[m]DCGERH690.0[m]DCGERH700.0[m]DCGERH710.0[m]DCGERH720.0[m]DCGERH730.0[m]DCGERH740.0[m]DCGERH750.0[m]DCGERH760.0[m]DCGERH770.0[m]DCGERH780.0[m]DCGERH790.0[m]DCGERH800.0[m]DCGERH810.0[m]DCGERH820.0[m]DCGERH830.0[m]DCGERH840.0[m]DCGERH870.0[m]DCGERH880.0[m]DCGERH890.0[m]DCGERH901.0[m]SWCGERH910.0[m]DCGERH920.0[m]DCGERH930.0[m]DCGERH940.0[m]DCGERH950.0[m]DCGERH960.0[m]DCGERH970.0[m]DCGERH980.0[m]DCGERH990.0[m]DCGERH1000.0[m]SWCGERH1010.0[m]DCGERH1020.0[m]DCGERH1030.0[m]DCGERH1040.0[m]DCGERH1050.0[m]DCGERH1060.0[m]DCGERH1070.0[m]DCGERH1080.0[m]DCGERH1124.0[m]DCGERH1136.0[m]DCGERH1148.0[m]DCGERH1163.0[m]DCGERH1205.0[m]SWCGERH1209.0[m]SWCGERH1234.0[m]SWCGERH1256.0[m]DCGERH1270.0[m]SWCGERH1292.0[m]DCGERH1304.0[m]DCGERH1316.0[m]DCGERH1328.0[m]DCGERH1340.0[m]DCGERH1352.0[m]DCGERH1364.0[m]DCGERH1376.0[m]DCGERH1388.0[m]DCGERH1406.0[m]DCGERH1412.0[m]DCGERH1448.0[m]DCGERH1460.0[m]DCGERH1472.0[m]DCGERH1484.0[m]DCGERH1496.0[m]DCGERH1508.0[m]DCGERH1520.0[m]DCGERH1532.0[m]DCGERH1544.0[m]DCGERH1565.0[m]SWCGERH1580.0[m]DCGERH1592.0[m]DCGERH1604.0[m]DCGERH1616.0[m]DCGERH1628.0[m]DCGERH1643.0[m]DCGERH1663.0[m]SWCGERH1673.0[m]DCGERH1688.0[m]DCGERH1703.0[m]DCGERH1718.0[m]DCGERH1737.0[m]SWCGERH1748.0[m]DCGERH1763.0[m]DCGERH1778.0[m]DCGERH1801.0[m]SWCGERH1812.0[m]SWCGERH1823.0[m]DCGERH1860.0[m]SWCGERH1883.0[m]DCGERH1906.0[m]SWCGERH1928.0[m]DCGERH1950.0[m]SWCGERH1973.0[m]DCGERH1988.0[m]DCGERH2000.0[m]DCGERH2018.0[m]DCGERH2033.0[m]DCGERH2048.0[m]DCGERH2063.0[m]DCGERH2078.0[m]DCGERH2100.0[m]SWCGERH2123.0[m]DCGERH2138.0[m]DCGERH2150.0[m]SWCGERH2168.0[m]DCGERH2183.0[m]DCGERH2200.0[m]SWCGERH2210.0[m]SWCGERH2228.0[m]DCGERH2242.0[m]SWCGERH2253.0[m]SWCGERH2261.5[m]SWCGERH2267.0[m]SWCGERH2276.0[m]DCRRI2284.0[m]SWCGERH2286.1[m]CRRI2289.2[m]CRRI2292.0[m]CRRI2295.2[m]CRRI2297.9[m]CRRI2299.2[m]CRRI2301.4[m]CRRI2303.0[m]DCGERH2304.6[m]CRRI2306.8[m]CRRI2308.8[m]CRRI2311.4[m]CRRI2312.0[m]DCGERH2312.4[m]CRRI2313.6[m]CRRI2314.2[m]CRRI2314.7[m]CRRI2317.6[m]CRRI2318.0[m]DCGERH2320.6[m]CRRI2322.8[m]CRRI2323.6[m]CRRI2325.6[m]CRRI2328.6[m]CRRI2331.9[m]CRRI2333.0[m]DCGERH2334.9[m]CRRI2337.8[m]CRRI2342.0[m]DCGERH2354.0[m]DCGERH2363.0[m]DCGERH2381.0[m]DCGERH2389.5[m]CRRI2391.9[m]CRRI2393.0[m]CICHRON2393.0[m]DCGERH2393.5[m]CRRI2396.0[m]CRRI2397.5[m]CRRI2399.7[m]CRRI2403.2[m]CICHRON2403.6[m]CRRI2405.9[m]CRRI2408.0[m]DCGERH2418.8[m]CRRI2421.8[m]CRRI2426.0[m]SWCGERH2429.0[m]SWCGERH2435.0[m]DCRRI2435.0[m]DCRRI2441.0[m]DCRRI2441.0[m]DCRRI2444.0[m]DCGERH2447.0[m]DCRRI2447.0[m]DCRRI2453.0[m]DCRRI2453.0[m]DCRRI2456.0[m]DCGERH2459.0[m]DCRRI2459.0[m]DCRRI2465.0[m]DCRRI2465.0[m]DCRRI2468.0[m]DCGERH2477.0[m]DCRRI2477.0[m]DCRRI2480.0[m]DCGERH2483.0[m]DCRRI2495.0[m]DCRRI2495.0[m]DCRRI2501.0[m]DCRRI2501.0[m]DCRRI2506.0[m]SWCGERH2528.0[m]DCGERH2540.0[m]DCGERH2552.0[m]DCGERH2588.0[m]DCGERH2600.0[m]DCGERH2654.0[m]SWCGERH2660.0[m]SWCGERH2662.0[m]SWCGERH2666.0[m]SWCGERH2690.0[m]DCGERH2699.0[m]DCGERH -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3184104101183118312301230217022052248227122852285242725102648 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.53 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf2.68 -
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]pdf43.46 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL3401975CST9011960CST16982100DLL22742694DLWD8852607ISF SON MSFL GR SP CAL3182700LDT CNL GR3811976LDT CNL GR NGT19752701RFT HP22862670RFT HP22862416RFT SG22862670RFT SG22862416SHDT8501969SHDT19752701VSP5402685 -
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 typeCONDUCTOR30381.036386.00.00LOTSURF.COND.20850.026865.01.55LOTINTERM.13 3/81975.017 1/21988.01.47LOTOPEN HOLE2700.012 1/42700.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3821.061000.010.6WATER BASED18.04.19858651.07600.012.0WATER BASED21.04.19858651.251100.011.0WATER BASED25.04.19858651.07WATER BASED29.04.19858651.05800.07.2WATER BASED29.04.19858651.241100.010.2WATER BASED26.04.19858651.07WATER BASED29.04.19858651.05800.07.2WATER BASED29.04.19858651.241100.010.2WATER BASED26.04.19858651.251100.011.0WATER BASED25.04.19858851.05800.07.6WATER BASED29.04.198510821.081300.08.9WATER BASED30.04.198512991.101200.013.1WATER BASED02.05.198514401.111100.08.9WATER BASED02.05.198516371.171200.08.9WATER BASED03.05.198516661.221200.08.0WATER BASED06.05.198517881.221300.08.0WATER BASED06.05.198518431.221300.08.0WATER BASED06.05.198519181.225.51900.0WATER BASED08.05.198520891.151100.05.1WATER BASED14.05.198522501.151100.05.0WATER BASED20.05.198522861.241100.05.0WATER BASED20.05.198523301.241500.06.4WATER BASED20.05.198523681.241500.05.9WATER BASED20.05.198523781.241500.05.9WATER BASED21.05.198524111.241600.06.8WATER BASED22.05.198524251.241500.05.9WATER BASED23.05.198524561.241500.05.9WATER BASED24.05.198525451.241600.05.9WATER BASED28.05.198525811.241600.05.5WATER BASED28.05.198526131.241700.07.2WATER BASED28.05.198526811.241800.05.1WATER BASED28.05.198527001.241800.06.3WATER BASED29.05.198527001.241700.06.3WATER BASED30.05.198527001.241700.07.6WATER BASED31.05.198527001.241700.07.6WATER BASED31.05.198527001.241700.06.3WATER BASED30.05.1985 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2379.35[m ]2401.65[m ]2405.65[m ]2423.65[m ] -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]PDF0.27