7321/9-1
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General information
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Wellbore history
GeneralWell 7321/9-1 was drilled on a rotated fault block on the southern margin of the Fingerdjupet Sub-basin in the Bjørnøya East area. The main objective was to test the hydrocarbon potential of the structure, with Late Triassic to Middle Jurassic sandstones as primary target horizon with Early Cretaceous and Triassic (Snadd Formation) sandstones as secondary targets. The wildcat well should also gather as much geological information as possible regarding reservoir, source and cap rock intervals. The well was positioned so that it should avoid faults that could disturb the seismic tie and at the same time would leave a minimum of untested potential up-dip from the well location.Operations and resultsWildcat well 7321/9-1 was spudded with the semi-submersible rig Ross Rig 25 October 1988 and drilled to TD at 1800 m in the Late Triassic Snadd Formation. Drilling proceeded to TD without any significant problems, but on the way out of the hole the string got stuck at 1501 m. After several unsuccessful attempts, the string was shot off at 1377 m. As a result of this, and because LWD logs were run only to 1507 m (Baroid "Recorded Lithology Logging" -tool, RLL), the hole below 1507 m was not logged. There were also mechanical problems during plugging. In total as much as 40% of the rig time was thus classified as down time. The well was drilled with seawater and hi-vis sweeps down to 680 m and with KCl / polymer mud from 680 m to TD. There was no shallow gas in the hole.The secondary target, a prognosed sandstone above the Barremian unconformity, was not developed. Instead of a reservoir sandstone a new possible source rock with high organic content was encountered in the Barremian interval from 961 m to 986 m. The primary target reservoir interval (Stø, Nordmela and Fruholmen Formations) was penetrated at 1378.8 m. Approx. 116 m of reservoir rock was found with 35.8 m net sand. The reservoirs were water bearing with only weak indications of hydrocarbons. The prognosed Triassic target in the Snadd Formation did not contain hydrocarbon shows nor significant gas. On this basis it was interpreted as water bearing.Shows were recorded on cuttings from claystones in several intervals from 920 m down to 1500 m. Shows were also recorded in sandstones in the cores in the interval 1373 m to 1398 m and on cuttings from the interval 1730 m to 1750 m.Two cores were cut in the interval 1365 - 1398.2 m, through lower part of the Hekkingen Formation, throughout the Fuglen Formation and most of the Stø Formation. Nineteen attempts of RFT pressure testing were done with only one good measurement at 1359 m. The formation pressure here was measured to be 0.83 SG. No fluid samples were taken. From approximately 1000 m to 670 m the quality of the MSFL and sonic logs was bad due to severe washout of the hole.The well was permanently abandoned on 28 November 1988 as dry with minor shows in the Cretaceous and Jurassic.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]690.001800.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11365.01384.1[m ]21385.21398.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]32.1Cores 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 typeLaboratory547.0[m]SWCHYDRO552.0[m]SWCHYDRO557.0[m]SWCHYDRO560.0[m]SWCHYDRO563.0[m]SWCHYDRO566.0[m]SWCHYDRO590.0[m]SWCHYDRO608.0[m]SWCHYDRO632.0[m]SWCHYDRO650.0[m]SWCHYDRO674.0[m]SWCHYDRO690.0[m]SWCHYDRO710.0[m]SWCHYDRO730.0[m]DCGEAR752.0[m]SWCHYDRO770.0[m]DCGEAR800.0[m]SWCHYDRO830.0[m]DCGEAR850.0[m]SWCHYDRO860.0[m]SWCHYDRO870.0[m]SWCHYDRO880.0[m]DCGEAR890.0[m]SWCHYDRO900.0[m]SWCHYDRO900.0[m]DCGEAR920.0[m]DCGEAR925.0[m]SWCHYDRO940.0[m]DCGEAR950.0[m]SWCHYDRO955.0[m]SWCHYDRO960.0[m]SWCHYDRO960.0[m]DCGEAR962.5[m]SWCHYDRO965.0[m]SWCHYDRO967.0[m]SWCHYDRO970.0[m]SWCHYDRO974.0[m]SWCHYDRO975.5[m]SWCHYDRO977.0[m]SWCHYDRO979.0[m]SWCHYDRO980.0[m]DCGEARHART982.0[m]SWCHYDRO984.0[m]SWCHYDRO985.0[m]SWCHYDRO987.0[m]SWCHYDRO990.0[m]SWCHYDRO995.0[m]SWCHYDRO1000.0[m]DCGEARHART1000.0[m]SWCHYDRO1020.0[m]DCGEARHART1040.0[m]DCGEARHA1050.0[m]SWCHYDRO1060.0[m]DCGEARHART1080.0[m]DCGEARHA1100.0[m]DCGEARHA1120.0[m]DCGEARHA1140.0[m]DCGEARHA1150.0[m]SWCHYDRO1160.0[m]DCGEARHART1180.0[m]DCGEARHA1200.0[m]DCGEARHA1200.0[m]SWCHYDRO1220.0[m]DCGEARHART1240.0[m]DCGEARHA1250.0[m]SWCHYDRO1260.0[m]DCGEARHART1280.0[m]DCGEARHA1290.0[m]SWCHYDRO1300.0[m]SWCHYDRO1300.0[m]DCGEARHART1302.5[m]SWCHYDRO1307.0[m]SWCHYDRO1308.0[m]SWCHYDRO1311.0[m]SWCHYDRO1312.0[m]DCGEARHART1313.0[m]SWCHYDRO1315.0[m]SWCHYDRO1316.0[m]SWCHYDRO1320.0[m]SWCHYDRO1320.0[m]DCGEARHART1322.0[m]SWCHYDRO1325.0[m]DCGEARHART1325.0[m]SWCHYDRO1328.0[m]SWCHYDRO1330.0[m]SWCHYDRO1335.0[m]DCGEARHART1336.0[m]SWCHYDRO1339.0[m]SWCHYDRO1344.0[m]SWCHYDRO1345.0[m]DCGEARHART1347.5[m]SWCHYDRO1350.0[m]SWCHYDRO1355.0[m]DCGEARHART1355.0[m]SWCHYDRO1360.0[m]SWCHYDRO1362.0[m]SWCHYDRO1365.0[m]DCGEARHART1367.9[m]COD1375.0[m]DCGEARHART1377.5[m]COD1378.8[m]CICHRON1379.6[m]COD1381.6[m]COD1382.5[m]CICHRON1385.0[m]DCGEARHART1390.8[m]COD1391.7[m]CICHRON1395.0[m]DCGEARHART1395.7[m]COD1398.0[m]COD1405.0[m]DCGEARHART1415.0[m]DCGEARHA1425.0[m]DCGEARHA1435.0[m]DCGEARHA1445.0[m]DCGEARHA1455.0[m]DCGEARHA1465.0[m]DCGEARHA1475.0[m]DCGEARHA1485.0[m]DCGEARHA1495.0[m]DCGEARHA1505.0[m]DCGEARHA1515.0[m]DCGEARHA1525.0[m]DCGEARHA1535.0[m]DCGEARHA1545.0[m]DCGEARHA1557.0[m]DCGEARHA1567.0[m]DCGEARHA1587.0[m]DCGEARHA1600.0[m]DCGEARHA1610.0[m]DCGEARHA1620.0[m]DCGEARHA1630.0[m]DCGEARHA1640.0[m]DCGEARHA1650.0[m]DCGEARHA1660.0[m]DCGEARHA1670.0[m]DCGEARHA1680.0[m]DCGEARHA1690.0[m]DCGEARHA1700.0[m]DCGEARHA1710.0[m]DCGEARHA1720.0[m]DCGEARHA1730.0[m]DCGEARHA1740.0[m]DCGEARHA1750.0[m]DCGEARHA1760.0[m]DCGEARHA1770.0[m]DCGEARHA1780.0[m]DCGEARHA1792.0[m]DCGEARHA1797.0[m]DCGEARHA -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit4835585588929861317136713791379141714241572 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.18 -
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]pdf11.59 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST547677CST6901362DIL LSS SP GR MSFL5401371LDL CNL NGL CAL GR6581371MWD - GR RES DIR5471362MWD - RLL13511506MWD - RLL EWR13511496RFT9371365SHDT6631366VSP4831365 -
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 typeCONDUCTOR30543.036546.00.00LOTINTERM.13 3/8668.017 1/2680.01.38LOTOPEN HOLE1800.012 1/41800.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5001.1415.07.0WATER BASED29.11.19885291.05WATER BASED31.10.19885461.05WATER BASED31.10.19885621.05WATER BASED31.10.19886221.1415.07.0WATER BASED24.11.19886801.05WATER BASED01.11.19886801.05WATER BASED02.11.19886801.05WATER BASED31.10.19886801.0813.06.0WATER BASED03.11.198810081.1414.07.0WATER BASED04.11.198812131.1416.07.0WATER BASED07.11.198813301.1416.07.0WATER BASED07.11.198813651.1416.07.0WATER BASED07.11.198813871.1417.010.0WATER BASED10.11.198813981.1417.09.0WATER BASED11.11.198814271.1417.07.0WATER BASED14.11.198815501.1416.011.0WATER BASED15.11.198817231.1418.08.0WATER BASED15.11.198818001.1418.08.0WATER BASED18.11.198818001.1418.08.0WATER BASED15.11.198818001.1417.08.0WATER BASED15.11.198818001.1418.08.0WATER BASED16.11.198818001.1416.07.0WATER BASED21.11.198818001.1115.07.0WATER BASED21.11.198818001.1115.07.0WATER BASED22.11.1988 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1379.50[m ]1380.75[m ]1388.50[m ]1397.75[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]PDF0.22