6507/5-4
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General information
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Wellbore history
GeneralExploration wells 6507/6-1 and 6507/6-2 were drilled by Saga in the period 1986 to 1991. Both were plugged and abandoned as dry with shows. The Amoco operated exploration well 6507/5-1 well was completed in 1998 and was suspended as an oil and gas discovery in the Jurassic and Cretaceous. The discovery was named Skarv while the Cretaceous part of it has informally been named Gråsel. In 1999, well 6507/5-2 was drilled by BP Amoco to appraise Skarv. The well was plugged and abandoned as a gas well. The Snadd structure was explored by the 6507/5-3 well in June 2000 and plugged and abandoned as a gas discovery.Well 6507/5-4 was drilled on the southern C-segment of the Skarv structure. The main reservoir target was sandstone in the Early - Middle Jurassic Garn, Ile and Tilje Formations. In the discovery case the objective was to gather the data required to allow confident oil reserves estimates. High-risk secondary targets were the Cretaceous Lysing and Lange Formations.Operations and resultsWildcat well 6507/5-4 was spudded with the semi-submersible installation Stena Dee on 10 February 2001 and drilled to TD at 3812 m (3820 m loggers depth) in the Early Jurassic sediments of the Åre Formation. The well was drilled with seawater and hi-vis sweeps down to 522 m, with KCl/glycol mud from 522 m to 1468 m, and with KCl mud from 1468 m to TD.Well 6507/5-4 successfully completed a logging program across Cretaceous secondary targets in the 12.25" hole, and a logging and coring programme of the primary Jurassic targets in 8.5" hole. Oil shows of variable strength were recorded from 3060 in the Lange Formation and down to TD. Oil and condensate were discovered in poor quality Early Cretaceous sands. The thin Lysing Formation was tight without shows. Oil and gas were discovered from 3513 m, top of the primary Garn reservoir target, while Ile and Tilje were water-wet. A gas/oil contact was indicated at 3542 m based on logs and cores, but no OWC was seen.Four conventional cores were cut in the Garn, Not, Ile, Ror, and Tilje Formations in the interval 3512 m to 3724 m. The core-log shift was ca + 7 m for all four cores. MDT fluid samples were taken in the Lange Formation as well as in the Fangst Group. Organic geochemical analyses of these indicated a similar source rock, but with a somewhat higher maturity in the Lange Formation petroleum.The well bore was plugged back to 1450 m on 15 April 2001 as an oil/gas appraisal of the Skarv Discovery. Since no OWC had been found a sidetrack, 6507/5-4 A, was decided to appraise the Garn down-dip oil leg.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]1470.003812.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13512.53534.5[m ]23535.03594.5[m ]33594.03679.0[m ]43678.03722.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]211.0Cores 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 typeCONDUCTOR30519.036522.00.00LOTSURF.COND.201461.0261466.01.62LOTINTERM.9 5/83494.012 1/43501.02.01LOTOPEN HOLE3820.08 1/23820.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]HRLA DSI GR SP EMS GPIT4203475HRLA DSI GR SP EMS GPIT33003820IPLT GR14603473IPLT GR34983820LWD - CWR GR5192203LWD - MPR GR17003512MDT GR27883245MDT GR35143621MDT GR35143575MDT GR35623811MDT GR35663582MSCT GR30283245VSP4453460VSP GR33503810VSP GR37653810 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit446446139818191819200220022047210221022186257627882788279333643371337135133513358136093632363236873774 -
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].pdf1.93.PDF0.71 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5190.001.0SPUD MUD10510.001.0SPUD MUD14660.001.0SPUD MUD16230.0015.0KCL16351.3924.0KCL21430.0020.0KCL22030.0020.0KCL26481.6127.0KCL28501.6125.0KCL29991.6130.0KCL32711.6120.0KCL34881.6127.0KCL35001.6236.0KCL35351.3017.0KCL37091.6325.0KCL38121.3420.0KCL38831.250.2WATER/BRINE38831.2812.0KCL -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1470.0[m]DCRESLAB1500.0[m]DCRESLAB1530.0[m]DCRESLAB1560.0[m]DCRESLAB1590.0[m]DCRESLAB1620.0[m]DCRESLAB1650.0[m]DCRESLAB1680.0[m]DCRESLAB1710.0[m]DCRESLAB1740.0[m]DCRESLAB1770.0[m]DCRESLAB1800.0[m]DCRESLAB1830.0[m]DCRESLAB1860.0[m]DCRESLAB1890.0[m]DCRESLAB1920.0[m]DCRESLAB1950.0[m]DCRESLAB1980.0[m]DCRESLAB2000.0[m]DCRESLAB2030.0[m]DCRESLAB2050.0[m]DCRESLAB2080.0[m]DCRESLAB2100.0[m]DCRESLAB2130.0[m]DCRESLAB2150.0[m]DCRESLAB2180.0[m]DCRESLAB2200.0[m]DCRESLAB2230.0[m]DCRESLAB2250.0[m]DCRESLAB2280.0[m]DCRESLAB2300.0[m]DCRESLAB2320.0[m]DCRESLAB2350.0[m]DCRESLAB2380.0[m]DCRESLAB2400.0[m]DCRESLAB2430.0[m]DCRESLAB2450.0[m]DCRESLAB2480.0[m]DCRESLAB2500.0[m]DCRESLAB2530.0[m]DCRESLAB2550.0[m]DCRESLAB2580.0[m]DCRESLAB2600.0[m]DCRESLAB2630.0[m]DCRESLAB2650.0[m]DCRESLAB2670.0[m]DCRESLAB2701.0[m]DCRESLAB2725.0[m]DCRESLAB2749.0[m]DCRESLAB2776.0[m]DCRESLAB2785.0[m]DCRESLAB2800.0[m]DCRESLAB2815.0[m]DCRESLAB2830.0[m]DCRESLAB2842.0[m]DCRESLAB2860.0[m]DCRESLAB2875.0[m]DCRESLAB2890.0[m]DCRESLAB2905.0[m]DCRESLAB2920.0[m]DCRESLAB2935.0[m]DCRESLAB2950.0[m]DCRESLAB2964.0[m]DCRESLAB2980.0[m]DCRESLAB2995.0[m]DCRESLAB3010.0[m]DCRESLAB3025.0[m]DCRESLAB3028.9[m]SWCRESLAB3046.8[m]SWCRESLAB3070.0[m]DCRESLAB3089.9[m]SWCRESLAB3101.7[m]SWCRESLAB3111.0[m]SWCRESLAB3129.9[m]SWCRESLAB3145.0[m]DCRESLAB3160.0[m]DCRESLAB3190.0[m]DCRESLAB3205.0[m]DCRESLAB3225.1[m]SWCRESLAB3235.0[m]DCRESLAB3244.4[m]SWCRESLAB3265.0[m]DCRESLAB3331.0[m]DCRESLAB3346.0[m]DCRESLAB3727.0[m]DCRESLAB3739.0[m]DCRESLAB3748.0[m]DCRESLAB3754.0[m]DCRESLAB3766.0[m]DCRESLAB3772.0[m]DCRESLAB3781.0[m]DCRESLAB3796.0[m]DCRESLAB3802.0[m]DCRESLAB3812.0[m]DCRESLAB