7120/6-1
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General information
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Wellbore history
GeneralWildcat well 7120/6 1 was drilled in the middle eastern part of the block, on a structure comprising an east-west horst block extending into blocks 7121/4 and 7121/5 to the east, and with a central east west oriented fault at Middle Jurassic level. The primary objective of the well was to test Middle Jurassic sand sequences in the Stø Formation. A further objective was to evaluate geologic trends in stratigraphy, structure and reservoir development in a northerly direction in the Hammerfest Basin. The well was prognosed to be drilled into rocks of Triassic ageOperations and resultsThe well was spudded with the semi submersible installation Treasure Scout 2 February 1985 and drilled to TD at 2820 m in Late Triassic rocks (Tubåen Formation). No significant problems occurred during drilling. It was drilled and tested in 90 days with only 4.4 days down time. Of these 3.2 days were wait-on-weather (WOW). The well was drilled with spud mud down to 815 m and with KCl/polymer mud from 815 m to TD.The well encountered hydrocarbon bearing Jurassic sands of the Stø Formation from 2385.5 m to 2469.5 m. The interval from 2385.5 to 2427 m was gas bearing and from 2427 to 2443 m oil bearing. In the interval 2559 - 2800 m (Tubåen Formation), thin gas bearing sandstone stringers were encountered. This interval spanned the Jurassic-Triassic boundary, and in the lower intervals below 2660 m net pay was associated with thin interbedded coals. Weak oil shows were observed in claystones in the Cretaceous below 2176 m. Good oil shows in sandstones were recorded throughout the hydrocarbon bearing zone and down to 2500 m. Below this level oil shows were in general associated either with mud stones or with coal seams and fragments.Geochemical studies indicated that the Tertiary and Cretaceous sediments were immature. Above 2300 m there were alternating poor source rocks for oil and gas and very good oil-prone source rocks. The top Jurassic interval from 2300 m to 2335 m there was rich oil potential source rocks, whilst below 2335 m there was rich potential for oil or for oil and gas. All indications are that there has been significant oil generation below 2320 m. Mature, good source rocks for gas with oil were present in the Tubåen Formation. Organic geochemical analyses also detected strong shows of a relatively waxy, medium gravity crude within the Stø and Nordmela Formation sandstones over the interval 2420 m to 2540 m. Geochemical fingerprinting indicated this oil to be compatible with the source facies present within the Tubåen Formation and the base of the Nordmela Formation.A total of 12 consecutive cores were taken from 2371 m, above the main objective to a depth of 2565 m in the Tubåen Formation. A total of 63 pre-tests in three RFT runs were taken, of which 23 were either too tight or experienced seal failure. Three segregated samples were taken at 2430 m (32 °API oil, gas, and filtrate), 2427.3 m (gas and filtrate), and 2399.5 m (gas, filtrate and a small amount of 50 °API condensate). A total of 107 sidewall cores were recovered from 904 m down to 2811.5 m. Sidewall cores taken in the interval 2040 - 2368 m were taken especially to be used in a Jurassic Shale Geochemical study.The well was permanently abandoned as an oil and gas appraisal on 2 May 1985.TestingFour Drill Stem Tests (DST's) were carried out in the Stø Formation, one water, one oil, and two gas tests.DST 1 perforated the interval: 2459 m to 2465 m and flowed 447 Sm3 water/day through an 80/64" choke.DST 2 perforated the interval 2432,05 m to 2436,05 m and flowed 1526 Sm3 oil and 178400 Sm3 gas per day through an 80/64" choke. Oil gravity was 31.9 °AP and gas gravity was 0.705 (air = 1). GOR was 117 Sm3/Sm3.DST 3 perforated the interval: 2418,35 m to 2424,35 m and gave no flow.DST 4 perforated the interval 2386,4 m to 2401,4 m and flowed 1262930 Sm3 gas and 162 Sm3 condensate per day through a 1" choke. Condensate gravity was 57 °API and gas gravity was 0.695 (air = 1). GOR was 7780 Sm3/Sm3. -
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]410.002820.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12371.02373.5[m ]22373.62377.0[m ]32381.02398.0[m ]42398.02417.6[m ]52418.52440.0[m ]62443.52470.0[m ]72470.52476.0[m ]82476.52492.0[m ]92492.52503.0[m ]102505.02530.5[m ]112530.52549.0[m ]122549.02565.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]182.1Cores 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 availableDSTDST22432.052436.05OIL13.04.1985 - 00:00YESDSTDST42386.002401.00CONDENSATE25.04.1985 - 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 typeCONDUCTOR30399.036404.00.00LOTSURF.COND.20804.026815.01.74LOTINTERM.13 3/82031.017 1/22046.01.73LOTINTERM.9 5/82820.012 1/42820.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02459246520.62.02432243631.73.0241824240.04.02386240125.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.04.00026.0002.06.7003.04.014.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.015261785420.8660.7051173.04.016212603600.7520.6957783 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST9042006CST20402355CST23402811DLL MSFL22722578DLL MSFL26742807HDT GR8052032ISF LSS GR SP3992581ISF LSS GR SP25802810LDT CNL GR8052811NGT20812727NGT22822582NGT26742811RFT23862562RFT24552797SHDT GR20292727SHDT GR26742811VELOCITY4002800 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit337410410108110811117111718432176228523672386238624702559 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.47 -
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]pdf15.85 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3871.25WATER BASED04.02.19854041.25WATER BASED04.02.19854041.05WATER BASED06.02.19854041.05WATER BASED06.02.19856701.0810.020.0WATER BASED07.02.19858151.0910.022.0WATER BASED10.02.19858151.1111.022.0WATER BASED10.02.19858151.09WATER BASED12.02.19858151.1014.09.0WATER BASED13.02.19858151.1013.09.0WATER BASED14.02.19858151.1114.010.0WATER BASED18.02.19858151.1111.022.0WATER BASED10.02.19858151.0910.022.0WATER BASED10.02.19858151.09WATER BASED12.02.19858151.1014.09.0WATER BASED13.02.19858151.1013.09.0WATER BASED14.02.19858151.1114.010.0WATER BASED18.02.19858151.0910.022.0WATER BASED10.02.19858241.109.010.0WATER BASED18.02.198511741.1315.012.0WATER BASED18.02.198513551.1615.012.0WATER BASED18.02.198515641.1815.012.0WATER BASED19.02.198516531.2020.016.0WATER BASED21.02.198518051.2018.015.0WATER BASED25.02.198518921.2219.016.0WATER BASED25.02.198519931.2220.014.0WATER BASED25.02.198520461.2219.014.0WATER BASED26.02.198520461.2219.014.0WATER BASED27.02.198520461.2220.09.0WATER BASED01.03.198520461.2219.014.0WATER BASED27.02.198520461.2220.09.0WATER BASED01.03.198521471.2220.012.0WATER BASED03.03.198522491.2221.013.0WATER BASED03.03.198523711.2218.012.0WATER BASED03.03.198523731.2218.012.0WATER BASED04.03.198523831.2215.010.0WATER BASED05.03.198523981.2216.08.0WATER BASED08.03.198524181.2216.010.0WATER BASED08.03.198524401.2218.014.0WATER BASED10.03.198524431.2319.012.0WATER BASED10.03.198524761.2318.012.0WATER BASED10.03.198525031.2217.012.0WATER BASED11.03.198525301.2219.012.0WATER BASED12.03.198525491.2219.012.0WATER BASED13.03.198525651.2217.013.0WATER BASED14.03.198525841.2219.012.0WATER BASED18.03.198525841.2215.011.0WATER BASED18.03.198525841.2215.011.0WATER BASED18.03.198526041.2218.011.0WATER BASED18.03.198526401.2216.010.0WATER BASED19.03.198526941.2217.010.0WATER BASED19.03.198527321.2215.010.0WATER BASED20.03.198527421.2216.011.0WATER BASED21.03.198527591.2216.010.0WATER BASED29.03.198527591.2214.09.0WATER BASED29.03.198527591.2212.07.0WATER BASED03.04.198527591.2215.07.0WATER BASED03.04.198527591.2220.05.0WATER BASED03.04.198527591.2218.07.0WATER BASED03.04.198527591.2213.07.0WATER BASED09.04.198527591.2012.06.0WATER BASED09.04.198527591.2215.09.0WATER BASED09.04.198527591.2219.011.0WATER BASED15.04.198527591.2218.011.0WATER BASED15.04.198527591.2217.010.0WATER BASED17.04.198527591.2217.013.0WATER BASED18.04.198527591.2216.012.0WATER BASED19.04.198527591.2216.010.0WATER BASED29.03.198527591.2214.09.0WATER BASED29.03.198527591.2212.07.0WATER BASED03.04.198527591.2215.07.0WATER BASED03.04.198527591.2220.05.0WATER BASED03.04.198527591.2218.07.0WATER BASED03.04.198527591.2012.06.0WATER BASED09.04.198527591.2215.09.0WATER BASED09.04.198527591.2219.011.0WATER BASED15.04.198527591.2218.011.0WATER BASED15.04.198527591.2217.010.0WATER BASED17.04.198527591.2216.012.0WATER BASED19.04.198527591.22WATER BASED27.03.198527591.2213.07.0WATER BASED09.04.198527591.2219.012.0WATER BASED16.04.198527591.2217.013.0WATER BASED18.04.198527591.2219.012.0WATER BASED16.04.198528121.2219.016.0WATER BASED24.03.198528201.2216.010.0WATER BASED25.03.198528201.2215.07.0WATER BASED23.04.198528201.2214.08.0WATER BASED23.04.198528201.2216.019.0WATER BASED23.04.198528201.2215.010.0WATER BASED23.04.198528201.2218.012.0WATER BASED26.04.198528201.2217.012.0WATER BASED26.04.198528201.2217.012.0WATER BASED29.04.198528201.2217.010.0WATER BASED29.04.198528201.2215.07.0WATER BASED23.04.198528201.2214.08.0WATER BASED23.04.198528201.2216.019.0WATER BASED23.04.198528201.2215.010.0WATER BASED23.04.198528201.2214.010.0WATER BASED25.04.198528201.2218.012.0WATER BASED26.04.198528201.2217.010.0WATER BASED29.04.198528201.22WATER BASED30.04.198528201.2217.012.0WATER BASED26.04.198528201.2217.012.0WATER BASED29.04.198528201.2214.010.0WATER BASED25.04.198528201.22WATER BASED30.04.1985 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory904.0[m]SWCSTRAT1010.0[m]DCSTRAT1055.0[m]DCSTRAT1073.0[m]SWCSTRAT1078.0[m]SWCSTRAT1107.5[m]SWCSTRAT1118.0[m]SWCSTRAT1123.0[m]SWCSTRAT1145.0[m]DCSTRAT1160.0[m]DCSTRAT1171.1[m]SWCSTRAT1190.0[m]DCSTRAT1205.0[m]DCSTRAT1220.0[m]DCSTRAT1235.0[m]DCSTRAT1256.0[m]SWCSTRAT1265.0[m]DCSTRAT1280.0[m]DCSTRAT1295.0[m]DCSTRAT1310.0[m]DCSTRAT1325.0[m]DCSTRAT1343.0[m]SWCSTRAT1355.0[m]DCSTRAT1370.0[m]DCSTRAT1380.1[m]SWCSTRAT1385.0[m]DCSTRAT1400.0[m]DCSTRAT1415.0[m]DCSTRAT1430.0[m]DCSTRAT1445.0[m]DCSTRAT1460.0[m]DCSTRAT1490.0[m]DCSTRAT1505.0[m]DCSTRAT1520.0[m]DCSTRAT1535.0[m]DCSTRAT1555.1[m]SWCSTRAT1565.0[m]DCSTRAT1580.0[m]DCSTRAT1604.8[m]SWCSTRAT1610.0[m]DCSTRAT1625.0[m]DCSTRAT1640.0[m]DCSTRAT1655.0[m]DCSTRAT1670.0[m]DCSTRAT1685.0[m]DCSTRAT1700.0[m]DCSTRAT1718.8[m]SWCSTRAT1730.0[m]DCSTRAT1745.0[m]DCSTRAT1775.0[m]DCSTRAT1791.0[m]SWCSTRAT1805.0[m]DCSTRAT1820.0[m]DCSTRAT1837.0[m]SWCSTRAT1840.1[m]SWCSTRAT1844.8[m]SWCSTRAT1848.9[m]SWCSTRAT1854.9[m]SWCSTRAT1868.9[m]SWCSTRAT1891.7[m]SWCSTRAT1910.0[m]DCSTRAT1920.0[m]SWCSTRAT1940.1[m]SWCSTRAT1955.0[m]DCSTRAT1980.1[m]SWCSTRAT2005.9[m]SWCSTRAT2015.0[m]DCSTRAT2040.0[m]SWCSTRAT2063.0[m]SWCSTRAT2080.0[m]SWCSTRAT2090.0[m]DCSTRAT2105.0[m]DCSTRAT2120.0[m]DCSTRAT2135.0[m]DCSTRAT2136.0[m]SWCSTRAT2150.0[m]DCSTRAT2160.0[m]SWCSTRAT2165.0[m]DCSTRAT2173.0[m]SWCSTRAT2177.5[m]SWCSTRAT2180.0[m]DCSTRAT2196.5[m]SWCSTRAT2203.0[m]SWCSTRAT2220.0[m]DCSTRAT2225.0[m]DCSTRAT2230.0[m]DCSTRAT2240.0[m]DCSTRAT2250.0[m]DCSTRAT2255.0[m]DCSTRAT2260.0[m]DCSTRAT2268.0[m]SWCSTRAT2280.0[m]DCSTRAT2285.0[m]DCSTRAT2290.0[m]DCSTRAT2300.0[m]DCSTRAT2310.0[m]DCSTRAT2315.0[m]DCSTRAT2320.0[m]DCSTRAT2330.0[m]DCSTRAT2340.0[m]DCSTRAT2345.0[m]DCSTRAT2350.0[m]DCSTRAT2355.0[m]SWCSTRAT2360.0[m]DCSTRAT2370.0[m]DCSTRAT2371.4[m]CSTRAT2371.9[m]CSTRAT2372.5[m]CSTRAT2373.0[m]CSTRAT2373.5[m]CSTRAT2373.7[m]CSTRAT2374.3[m]CSTRAT2375.3[m]CSTRAT2375.7[m]CSTRAT2376.3[m]CSTRAT2380.0[m]DCSTRAT2381.3[m]CSTRAT2384.0[m]CICHRON2388.2[m]CICHRON2391.4[m]CSTRAT2400.6[m]CSTRAT2406.7[m]CICHRON2410.9[m]CSTRAT2418.9[m]CICHRON2420.5[m]CSTRAT2423.4[m]CICHRON2449.9[m]CSTRAT2470.5[m]CSTRAT2475.1[m]CICHRON2480.8[m]CSTRAT2482.4[m]CICHRON2490.9[m]CSTRAT2494.5[m]CICHRON2502.0[m]CSTRAT2511.0[m]CSTRAT2512.0[m]CICHRON2520.6[m]CSTRAT2530.5[m]CSTRAT2530.5[m]CICHRON2540.6[m]CSTRAT2550.2[m]CSTRAT2560.8[m]CICHRON2570.0[m]CSTRAT2580.0[m]DCSTRAT2600.0[m]SWCSTRAT2605.0[m]SWCSTRAT2614.0[m]SWCSTRAT2630.0[m]DCSTRAT2637.5[m]SWCSTRAT2640.0[m]DCSTRAT2660.0[m]DCSTRAT2670.0[m]DCSTRAT2678.0[m]SWCSTRAT2690.0[m]DCSTRAT2700.0[m]DCSTRAT2713.0[m]SWCSTRAT2714.5[m]SWCSTRAT2717.0[m]SWCSTRAT2723.5[m]SWCSTRAT2733.0[m]SWCSTRAT2737.5[m]SWCSTRAT2753.0[m]SWCSTRAT2759.5[m]SWCSTRAT2765.0[m]SWCSTRAT2779.5[m]SWCSTRAT2799.0[m]SWCSTRAT -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2389.65[m ]2398.65[m ]2401.70[m ]2406.75[m ]2420.00[m ]2428.75[m ]2444.35[m ]2451.00[m ]2471.35[m ]2485.63[m ]2492.66[m ]2495.30[m ]2546.40[m ]2562.66[m ]2388.65[m ]2395.35[m ]2398.40[m ]2401.65[m ]2403.35[m ]2429.65[m ]2431.65[m ]2444.35[m ]2447.65[m ]2450.65[m ]2453.65[m ]2457.00[m ]2460.35[m ]2462.65[m ]2465.35[m ]2470.35[m ]2472.65[m ]2474.35[m ]