7125/4-1
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General information
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Wellbore history
Wellbore historyGeneralWildcat well 7125/4-1 was drilled on the Måsøy Fault Complex in the Barents Sea. The primary objective was to prove commercial hydrocarbon resources within the Nucula prospect, a 4-way structural closure dependent on sealing faults. The structure comprises the Middle Jurassic - Late Triassic Realgrunnen Group, the Late - Middle Triassic Snadd Formation and the Middle Triassic Kobbe Formation reservoirs.Operations and resultsWell 7125/4-1 was spudded with the semi-submersible installation Polar Pioneer on 17 January 2007 and drilled to TD at 1615 m in the Early Triassic Klappmyss Formation. The well was drilled without significant technical problems. It was drilled with sodium chloride brine down to 465 m and with potassium formate mud from 465 m to TD. No shallow gas was observed.The Kapp Toscana Group, penetrated at 872 m, proved movable gas and oil in the Nordmela and Fruholmen Formations with a GOC at 894 m and an ODT at 939 m. Gas and oil samples were recovered at 951.8 m and 967 m respectively, suggest a separate reservoir at this level, but tight formation makes it difficult to evaluate, and these samples may represent a continuation of the reservoir above. The reservoir had a considerably poorer net/gross than expected. The underlying Snadd Formation was encountered at 1002 m. It was water bearing in the upper part where some sandstone intervals with very good reservoir quality were penetrated. Traces of oil and gas were described in the lower part of Snadd. The Kobbe Formation was encountered at 1206 m. It had a few good reservoir sandstones, especially in the upper part, and some residual oil was proven in this zone. Towards the lower part of the formation at 1428 m, some 60 m of gas was proven down to a probable thin oil zone at 1484 m. The lowest part of the Kobbe Formation proved water gradient. The Klappmyss Formation, penetrated outside of the structural closure, contained interbedded claystones and sandstones without shows of hydrocarbons.Two cores were cut in the Fruholmen Formation comprising mudstones, sandstones and siltstones. MDT gas samples were recovered at 883.4 m, 951.8 m and 1477.3 m. MDT oil samples were recovered at 914.5 m, 938.1 m, 967.0 m, 898.2 m and 1487.8 m. MDT water samples were collected at 986.5 and 1508.9 m.After wire line logging the well was permanently plugged and abandoned as an oil and gas discovery well on 7 March 2007.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]470.001615.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom1885.0894.7[m ]2895.0909.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]23.8Cores 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 typeCONDUCTOR30376.036376.00.00LOTSURF.COND.20454.026454.00.00LOTINTERM.13 3/8551.017 1/2551.01.14LOTINTERM.9 5/8838.012 1/4838.01.51LOTOPEN HOLE1615.08 1/21615.01.85LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DSI TLD DNL556844FMI APS GR PPC MSIP8381253FMI MSIP PPC12301605MDT8621245MDT873986MDT PEX ECS HNGS11341604MDT Q14051524MSCT8401593MSCT12531253MSIP PPC IS12001284MWD - ARC DT RAB APWD DIR3161615SP SMR HRLA PEX ECS HNGS8381253VSP3171605 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3164934934994995385386997027337798178178648698728728821002120612061561 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.28 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]txt0.00txt0.33pdf0.40pdf2.40 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4041.03WATER BASED4741.0714.0WATER BASED5561.0811.0WATER BASED7051.3019.0WATER BASED8441.3019.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory470.0[m]DCFUGRO490.0[m]DCFUGRO496.0[m]DCFUGRO500.0[m]DCFUGRO510.0[m]DCFUGRO516.0[m]DCFUGRO530.0[m]DCFUGRO540.0[m]DCFUGRO560.0[m]DCFUGRO570.0[m]DCFUGRO580.0[m]DCFUGRO600.0[m]DCFUGRO620.0[m]DCFUGRO640.0[m]DCFUGRO660.0[m]DCFUGRO680.0[m]DCFUGRO690.0[m]DCFUGRO700.0[m]DCFUGRO710.0[m]DCFUGRO720.0[m]DCFUGRO730.0[m]DCFUGRO740.0[m]DCFUGRO750.0[m]DCFUGRO760.0[m]DCFUGRO770.0[m]DCFUGRO780.0[m]DCFUGRO790.0[m]DCFUGRO800.0[m]DCFUGRO810.0[m]DCFUGRO820.0[m]DCFUGRO830.0[m]DCFUGRO845.0[m]DCFUGRO850.0[m]DCFUGRO856.0[m]DCFUGRO862.0[m]DCFUGRO865.0[m]DCFUGRO868.0[m]DCFUGRO871.0[m]DCFUGRO871.0[m]SWCFUGRO874.0[m]DCFUGRO877.0[m]DCROBERT879.5[m]SWCFUGRO880.0[m]DCFUGRO883.0[m]DCFUGRO885.0[m]DCFUGRO887.3[m]CICHRON889.0[m]CFUGRO901.6[m]CICHRON905.0[m]CICHRON906.3[m]CICHRON907.5[m]CICHRON913.0[m]DCFUGRO952.0[m]DCFUGRO958.0[m]DCFUGRO964.0[m]DCFUGRO967.0[m]DCFUGRO976.0[m]DCFUGRO985.0[m]DCFUGRO988.0[m]DCFUGRO994.0[m]DCFUGRO1003.0[m]DCFUGRO1009.0[m]DCFUGRO1021.0[m]DCFUGRO1036.0[m]DCFUGRO1042.0[m]DCFUGRO1054.0[m]DCFUGRO1060.0[m]DCFUGRO1066.0[m]DCFUGRO1084.0[m]DCFUGRO1090.0[m]DCFUGRO1096.0[m]DCFUGRO1105.0[m]DCFUGRO1123.0[m]DCFUGRO1126.0[m]DCFUGRO1138.0[m]DCFUGRO1150.0[m]DCFUGRO1168.0[m]DCFUGRO1186.0[m]DCFUGRO1192.0[m]DCFUGRO1198.0[m]DCFUGRO1203.0[m]SWCFUGRO1204.0[m]DCFUGRO1205.0[m]SWCFUGRO1213.0[m]DCFUGRO1218.0[m]SWCFUGRO1219.0[m]DCFUGRO1228.0[m]DCFUGRO1237.0[m]SWCFUGRO1245.0[m]SWCFUGRO1249.0[m]DCFUGRO1252.0[m]DCFUGRO1258.0[m]DCFUGRO1285.0[m]DCFUGRO1297.0[m]DCFUGRO1303.0[m]DCFUGRO1306.0[m]DCFUGRO1310.0[m]DCFUGRO1328.0[m]DCFUGRO1333.0[m]DCFUGRO1339.0[m]DCFUGRO1339.0[m]SWCFUGRO1342.0[m]DCFUGRO1346.7[m]SWCFUGRO1358.6[m]SWCFUGRO1378.0[m]DCFUGRO1379.1[m]SWCFUGRO1384.0[m]DCFUGRO1390.0[m]DCFUGRO1396.0[m]DCFUGRO1409.2[m]SWCFUGRO1414.0[m]DCFUGRO1421.0[m]DCFUGRO1429.0[m]DCFUGRO1435.0[m]DCFUGRO1441.0[m]DCFUGRO1448.0[m]DCFUGRO1459.0[m]DCFUGRO1465.0[m]DCFUGRO1488.0[m]DCFUGRO1501.0[m]DCFUGRO1505.0[m]DCFUGRO1513.0[m]DCFUGRO1522.0[m]DCFUGRO1525.0[m]DCFUGRO1534.0[m]DCFUGRO1540.0[m]DCFUGRO1548.0[m]DCFUGRO1550.0[m]SWCFUGRO1555.0[m]DCFUGRO1567.0[m]DCFUGRO1571.0[m]DCFUGRO1573.0[m]DCFUGRO1575.2[m]SWCFUGRO1579.0[m]DCFUGRO1588.0[m]DCFUGRO1588.0[m]SWCFUGRO1593.0[m]SWCFUGRO1600.0[m]DCFUGRO1609.0[m]DCFUGRO1612.0[m]DCFUGRO1615.0[m]DCFUGRO -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit885.20[m ]886.40[m ]887.20[m ]894.20[m ]899.80[m ]901.05[m ]904.50[m ]905.50[m ]