7321/8-1
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General information
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Wellbore history
GeneralWell 7321/8-1 is located in the Fingerdjupet Sub-basin in the Bjørnøya East area. The main target of the well was to test the reservoir properties and hydrocarbon potential of Middle to Early Jurassic sandstones. It was drilled in a position that would leave the minimum of reserves untested up-dip. Secondary targets were seen in Late Triassic sandstones and in the Permian sequence. The wildcat well should further establish good seismic tie and gather maximum amount of geological information on source, seal and reservoir intervals.Operations and resultsWildcat well 7321/8-1 was spudded with the semi-submersible installation Polar Pioneer 23 June 1987 and drilled to TD at 3482 m in Late Permian silicified shale of the Røye Formation. Drilling operations went without significant problems. The well was drilled with seawater and hi-vis pills down to 818 m, with KCl / polymer mud from 818 m to 2584 m, and with polymer mud from 2584 m to TD. The hole was drilled to 818 m without riser.The primary target reservoir interval (expected Stø-Tubåen Formations) was penetrated at 1437 m, 201 m higher than expected. The best interval here was from 1437 m to 1567 m, which consisted of a fine-medium grained sandstone with interbedded shales. The sequence had 92 m net sand with 17.8 % average porosity. The interval was found water bearing with residual hydrocarbon saturation. The Base Late Triassic sandstone interval was found water bearing. The prognosed Permian reservoir sequences were found at 3398 m, 875 m higher than expected. It was poorly developed and merely consisted of silicified and pyritised shales and claystones with some minor weakly calcite cemented, low porosity sandstones. No hydrocarbon indications were seen in this section. Shows were recorded on cuttings and cores in several sequences between 890 m and 1557 m. Shows were also recorded on cuttings from 2618 m to 2628 m. Seven cores were cut in this well. Four of these were cut in the interval 1443.5 m to 1544.7 m in the primary target interval. Two were cut in the intervals 2670.8 m to 2678.8 m and 2839 m to 2847 m in the Triassic and one from 3430 m to 3431.4 m in the Late Permian. RFT fluid samples were taken at 2598.8 m (150 ml mud filtrate only) and at 1476.4 m (Formation water and gas).The well was permanently abandoned on 3 September 1987 as a dry hole with residual hydrocarbon shows in Jurassic and Late Triassic sandstones.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]825.003482.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11443.51465.5[m ]21465.51493.1[m ]31493.71516.4[m ]41516.61544.6[m ]52670.82677.9[m ]62839.02846.9[m ]73430.03431.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]116.7Cores 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 typeLaboratory580.0[m]SWCHYDRO605.0[m]SWCHYDRO634.2[m]SWCHYDRO650.0[m]SWCHYDRO674.0[m]SWCHYDRO684.3[m]SWCHYDRO701.7[m]SWCHYDRO739.5[m]SWCHYDRO769.5[m]SWCHYDRO780.0[m]SWCHYDRO790.0[m]SWCHYDRO825.0[m]DCGEAR844.0[m]SWCHYDRO845.0[m]DCGEAR857.0[m]DCHYDRO865.0[m]DCGEAR875.0[m]DCGEAR885.0[m]DCGEAR905.0[m]DCGEAR920.0[m]DCGEAR945.0[m]DCGEAR965.0[m]DCGEAR975.0[m]SWCHYDRO985.0[m]DCGEAR1005.0[m]DCGEAR1025.0[m]DCGEAR1042.0[m]SWCHYDRO1045.0[m]DCGEAR1065.0[m]DCGEAR1085.0[m]DCGEAR1105.0[m]DCGEAR1125.0[m]DCGEAR1132.0[m]SWCHYDRO1145.0[m]DCGEAR1165.0[m]DCGEAR1185.0[m]DCGEAR1201.0[m]SWCHYDRO1205.0[m]DCGEAR1225.0[m]DCGEAR1245.0[m]DCGEAR1250.0[m]SWCHYDRO1250.0[m]DCOD1265.0[m]DCGEAR1271.6[m]SWCHYDRO1280.0[m]DCOD1285.0[m]DCGEAR1292.0[m]SWCHYDRO1305.0[m]DCGEAR1325.0[m]DCGEAR1345.0[m]DGEAR1345.0[m]DCOD1349.0[m]SWCHYDRO1350.0[m]DCOD1355.0[m]DCOD1360.0[m]DCOD1365.0[m]DCGEAR1365.0[m]DCOD1369.2[m]SWCHYDRO1370.0[m]DCOD1375.0[m]DCOD1377.0[m]SWCHYDRO1380.0[m]DCOD1384.0[m]SWCHYDRO1385.0[m]DCGEAR1387.0[m]SWCHYDRO1390.0[m]DCOD1395.0[m]DCOD1396.0[m]SWCHYDRO1400.0[m]DCOD1405.0[m]SWCHYDRO1405.0[m]DCGEAR1405.0[m]DCOD1407.0[m]DCOD1411.0[m]SWCHYDRO1412.0[m]DCOD1417.0[m]DCGEAR1417.0[m]DCOD1420.0[m]DCOD1421.0[m]SWCHYDRO1422.0[m]DCOD1425.0[m]DCOD1427.0[m]DCOD1430.0[m]DCOD1430.0[m]DCGEAR1432.0[m]DCGEAR1432.0[m]DCOD1435.0[m]DCOD1435.0[m]DCGEAR1436.0[m]SWCHYDRO1438.0[m]DCOD1440.0[m]DCOD1443.7[m]COD1445.0[m]DCGEAR1445.5[m]CHYDRO1445.5[m]COD1448.8[m]COD1449.3[m]CHYDRO1451.8[m]COD1452.3[m]COD1455.2[m]CHYDRO1457.5[m]CHYDRO1462.0[m]DCGEAR1462.0[m]CUIB1462.7[m]COD1464.1[m]CHYDRO1464.5[m]COD1465.5[m]COD1467.0[m]CUIB1468.4[m]CHYDRO1470.0[m]DCGEAR1470.0[m]CUIB1470.1[m]CHYDRO1472.1[m]CHYDRO1475.0[m]CUIB1477.0[m]CUIB1479.2[m]CHYDRO1480.0[m]DCGEAR1480.0[m]CUIB1481.9[m]CHYDRO1484.7[m]CHYDRO1486.0[m]DCGEAR1488.3[m]CICHRON1489.3[m]CICHRON1489.7[m]CHYDRO1494.8[m]CHYDRO1497.0[m]CUIB1500.0[m]DCGEAR1510.0[m]DCGEAR1512.0[m]CUIB1516.4[m]DCGEAR1520.0[m]DCGEAR1521.0[m]DCGEAR1527.8[m]CHYDRO1528.0[m]DCGEAR1528.0[m]CHYDRO1530.0[m]DCGEAR1530.0[m]CUIB1538.6[m]CHYDRO1540.0[m]DCGEAR1540.8[m]CHYDRO1542.1[m]CHYDRO1544.7[m]CGEAR1550.0[m]DCGEAR1550.0[m]CUIB1551.0[m]SWCHYDRO1560.0[m]DCGEAR1562.0[m]SWCHYDRO1570.0[m]CUIB1570.0[m]DCGEAR1573.0[m]SWCHYDRO1580.0[m]DCGEAR1580.0[m]CUIB1585.0[m]SWCHYDRO1590.0[m]DCGEAR1592.0[m]CUIB1600.0[m]CUIB1600.0[m]DCGEAR1607.0[m]CUIB1610.0[m]DCGEAR1615.0[m]CUIB1620.0[m]CUIB1620.0[m]DCGEAR1622.0[m]CUIB1623.0[m]SWCHYDRO1625.0[m]CUIB1627.0[m]CUIB1630.0[m]DCGEAR1635.0[m]CUIB1642.0[m]DCGEAR1650.0[m]DCGEAR1650.0[m]CUIB1660.0[m]DCGEAR1665.5[m]SWCHYDRO1672.0[m]CUIB1672.0[m]DCGEAR1685.0[m]DCHYDRO1700.0[m]CUIB1725.0[m]DCHYDRO1735.7[m]SWCHYDRO1738.5[m]SWCHYDRO1765.0[m]DCHYDRO1787.1[m]SWCHYDRO1803.5[m]SWCHYDRO1805.0[m]DCHYDRO1810.0[m]SWCHYDRO1810.0[m]DCOD1815.5[m]SWCHYDRO1840.0[m]DCOD1845.0[m]DCHYDRO1867.3[m]SWCHYDRO1880.0[m]DCHYDRO1915.3[m]SWCHYDRO1920.0[m]DCHYDRO1960.0[m]DCHYDRO1975.0[m]SWCHYDRO1989.0[m]SWCHYDRO2000.0[m]DCHYDRO2004.6[m]SWCHYDRO2010.0[m]DCOD2040.0[m]DCOD2040.0[m]DCHYDRO2043.2[m]SWCHYDRO2096.5[m]SWCHYDRO2120.0[m]DCHYDRO2160.0[m]DCHYDRO2161.0[m]SWCHYDRO2198.0[m]SWCHYDRO2200.0[m]DCHYDRO2213.7[m]SWCHYDRO2240.0[m]DCHYDRO2280.0[m]DCHYDRO2295.0[m]SWCHYDRO2300.0[m]DCHYDRO2310.0[m]DCOD2310.0[m]DCOD2320.0[m]DCHYDRO2329.0[m]SWCHYDRO2340.0[m]DCOD2340.0[m]DCHYDRO2370.0[m]SWCHYDRO2380.0[m]DCHYDRO2400.0[m]DCHYDRO2420.0[m]DCOD2429.0[m]SWCHYDRO2430.0[m]DCHYDRO2450.0[m]DCOD2450.0[m]SWCHYDRO2474.0[m]SWCHYDRO2490.0[m]DCHYDRO2500.0[m]DCOD2520.0[m]SWCHYDRO2530.0[m]DCHYDRO2530.0[m]DCOD2550.0[m]DCHYDRO2582.5[m]SWCHYDRO2590.0[m]DCHYDRO2617.0[m]SWCHYDRO2630.0[m]DCHYDRO2630.0[m]DCOD2634.0[m]SWCHYDRO2650.0[m]SWCHYDRO2660.0[m]DCOD2662.0[m]SWCHYDRO2667.0[m]DCHYDRO2671.4[m]CHYDRO2673.4[m]CHYDRO2675.4[m]CHYDRO2677.3[m]CHYDRO2681.5[m]SWCHYDRO2685.0[m]SWCHYDRO2690.0[m]SWCHYDRO2692.0[m]DCHYDRO2710.0[m]DCHYDRO2719.0[m]SWCHYDRO2730.0[m]DCHYDRO2759.0[m]SWCHYDRO2760.0[m]DCHYDRO2778.0[m]SWCHYDRO2790.0[m]DCHYDRO2810.0[m]DCHYDRO2813.0[m]SWCHYDRO2830.0[m]SWCHYDRO2830.0[m]DCHYDRO2840.0[m]DCHYDRO2841.2[m]CHYDRO2842.4[m]CHYDRO2843.4[m]CHYDRO2845.9[m]CHYDRO2846.6[m]CHYDRO2860.0[m]DCHYDRO2870.0[m]DCHYDRO2870.0[m]DCOD2874.0[m]SWCHYDRO2874.0[m]SWCHYDRO2880.0[m]DCHYDRO2900.0[m]DCOD2902.0[m]DCHYDRO2910.0[m]SWCHYDRO2922.0[m]DCHYDRO2942.0[m]DCHYDRO2950.0[m]SWCHYDRO2972.0[m]DCHYDRO3000.0[m]SWCHYDRO3012.0[m]DCHYDRO3050.0[m]DCHYDRO3063.0[m]SWCHYDRO3070.0[m]DCHYDRO3100.0[m]SWCHYDRO3110.0[m]DCHYDRO3150.0[m]SWCHYDRO3150.0[m]DCHYDRO3175.0[m]SWCHYDRO3190.0[m]DCHYDRO3200.0[m]SWCHYDRO3207.0[m]DCHYDRO3227.0[m]DCHYDRO3247.0[m]DCHYDRO3267.0[m]DCHYDRO3269.0[m]SWCHYDRO3287.0[m]DCHYDRO3302.0[m]SWCHYDRO3307.0[m]DCHYDRO3324.5[m]SWCHYDRO3325.0[m]SWCHYDRO3327.0[m]DCHYDRO3347.0[m]DCHYDRO3350.0[m]DCOD3356.0[m]SWCHYDRO3366.0[m]SWCHYDRO3367.0[m]DCHYDRO3373.5[m]SWCHYDRO3380.0[m]DCOD3382.0[m]SWCHYDRO3387.0[m]DCHYDRO3395.0[m]DCHYDRO3396.0[m]SWCHYDRO3407.0[m]DCHYDRO3420.0[m]DCOD3425.0[m]DCOD3427.0[m]DCHYDRO3430.7[m]CHYDRO3430.7[m]COD3431.1[m]CHYDRO3431.1[m]COD3442.0[m]DCHYDRO3450.0[m]DCOD3450.0[m]DCOD3452.5[m]SWCHYDRO3462.0[m]DCHYDRO3480.0[m]DCOD3482.0[m]DCHYDRO 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Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit491546546852135213831427143714371455146716263362336233983398 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.63 -
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]pdf15.14 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AMS590770AMS7932533AMS13451662AMS25103469CBL VDL7932510CST580790CST8031415CST13221413CST14161628CST16312520CST25373480DIL LSS SP GR600798DIL LSS SP GR7932531DIL LSS SP GR13001669DIL LSS SP GR25103482DLL GR7932531DLL GR25103475LDL CNL CAL GR588778LDL CNL CAL GR7932531LDL CNL CAL GR13451671LDL CNL CAL GR25103469MSFL7932531MSFL13001669MSFL25103482MWD - GR RES DIR4973474NGT13453460RFT8511820RFT14461640RFT18712496RFT26043122RLL13851680SHDT GR7932533SHDT GR25103480VSP6002525VSP13673482 -
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 typeCONDUCTOR30578.036806.00.00LOTSURF.COND.20796.026818.01.55LOTINTERM.13 3/82513.017 1/22532.00.00LOTOPEN HOLE3482.012 1/43482.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5381.03WATER BASED25.06.19875400.00WATER BASED03.09.19875781.03WATER BASED25.06.19878061.03WATER BASED26.06.19878181.3023.09.0WATER BASED29.06.19878181.0323.09.0WATER BASED30.06.19878181.16WATER BASED01.07.19878181.1623.013.0WATER BASED03.07.19878821.1721.018.0WATER BASED03.07.198710981.2522.013.0WATER BASED06.07.198712171.2622.014.0WATER BASED06.07.198712871.2523.012.0WATER BASED06.07.198713521.2525.012.0WATER BASED07.07.198714381.2625.011.0WATER BASED13.07.198714561.2523.011.0WATER BASED13.07.198714891.2526.012.0WATER BASED13.07.198715161.2525.011.0WATER BASED13.07.198715451.2525.011.0WATER BASED13.07.198716211.2525.012.0WATER BASED17.07.198716261.2525.011.0WATER BASED13.07.198716751.2525.012.0WATER BASED20.07.198716801.2525.012.0WATER BASED14.07.198716801.2526.013.0WATER BASED15.07.198716801.2525.011.0WATER BASED16.07.198717841.2526.013.0WATER BASED20.07.198718501.2525.011.0WATER BASED20.07.198719471.2526.011.0WATER BASED21.07.198720471.2526.010.0WATER BASED22.07.198720671.2526.011.0WATER BASED23.07.198721511.2527.011.0WATER BASED23.07.198721861.2527.011.0WATER BASED27.07.198722591.2526.011.0WATER BASED27.07.198723161.2525.010.0WATER BASED27.07.198723551.2016.05.0WATER BASED03.09.198723801.2526.010.0WATER BASED28.07.198724471.2524.09.0WATER BASED31.07.198724701.2624.09.0WATER BASED31.07.198724711.2623.08.0WATER BASED31.07.198725221.2623.08.0WATER BASED03.08.198725321.2620.08.0WATER BASED03.08.198725321.2622.08.0WATER BASED04.08.198725321.2623.08.0WATER BASED06.08.198725321.2620.07.0WATER BASED07.08.198725321.2619.07.0WATER BASED10.08.198725321.2621.07.0WATER BASED10.08.198725321.2622.08.0WATER BASED05.08.198725841.2618.07.0WATER BASED11.08.198726501.2619.08.0WATER BASED12.08.198726761.2718.07.0WATER BASED13.08.198727181.2618.06.0WATER BASED14.08.198728141.2617.07.0WATER BASED17.08.198728471.2618.09.0WATER BASED17.08.198729071.2617.07.0WATER BASED17.08.198730141.2619.07.0WATER BASED18.08.198730901.2621.08.0WATER BASED20.08.198731371.2619.07.0WATER BASED20.08.198731701.2619.08.0WATER BASED21.08.198732551.2619.07.0WATER BASED24.08.198733071.2618.07.0WATER BASED24.08.198733921.2618.07.0WATER BASED24.08.198734281.2618.07.0WATER BASED26.08.198734291.2618.06.0WATER BASED26.08.198734311.2617.07.0WATER BASED27.08.198734501.2619.08.0WATER BASED28.08.198734821.2016.06.0WATER BASED31.08.198734821.2016.05.0WATER BASED31.08.1987 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2840.25[m ]2844.44[m ]3431.35[m ]3430.30[m ]3430.50[m ]1445.00[m ]1449.65[m ]1451.65[m ]1456.35[m ]1463.00[m ]2671.85[m ]2839.95[m ]2840.15[m ]2842.70[m ]2843.75[m ]2844.55[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]pdf0.28