6507/12-3
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General information
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Wellbore history
GeneralWildcat well 6507/12-3 was drilled east of and near to the Midgard field on Haltenbanken. The main objective was to test the W-1 prospect located on the western margin of the Trøndelag Platform, on the eastern edge of the Ellingråsa Graben. The structure was seen as a domed N-S striking horst restricted by the main platform fault to the west and a related antithetic fault to the east with throws of approximately 350 m and 100 m, respectively. Primary target was the Middle Jurassic sandstones of the Fangst Group. A secondary target was the Lower Jurassic sandstones of the Tilje Formation, and to penetrate the coal horizon in the Åre Formation. Proposed TD was at 2700 m.Operations and resultsWell 6507/12-3 was spudded with Wi1h. Wi1helmsen semi-submersible installation Treasure Saga on 16 August 1985 and drilled to TD at 2600 m in the Early Jurassic Åre Formation. The well was drilled with spud mud down to 380 m, with gel mud from 380 m to 920 m, with Gypsum / Polymer mud from 920 m to 1949 m, and with a gel mud again from 1949 m to TD. A gas flow occurred between the 20" and 30" casing. The casing was perforated at 705 m and cement successfully squeezed. Gas flow continued to be a problem and the 13 3/8" casing was also perforated and cement squeeze was performed in both the lower and upper perforations.The Quaternary/Tertiary Sequence was 1596 m thick and consisted predominantly of marine claystones. Cretaceous was represented by a 75 m sequence of Springar Formation. Two metre of Spekk Formation was encountered at 1937 m, followed by 33 m of Melke Formation. The Fangst Group was penetrated at 1974 m, 20 m above the prognosed depth. MWD displayed fall in resistivity and the formation was considered dry. All Jurassic sandstone sequences were water bearing. A number of gas peaks were recorded from 474 m to 804 m, but there were no oil shows observed in the well.Two cores were attempted in the interval 1981 m to 2016 m in the Garn Formation, but only the 1981 to 1988.5 m interval of the first was recovered. A third core was cut for source rock studies in the interval 2503.5 m to 2521.5 m in the Åre Formation. The well was permanently abandoned on 13 September 1985 as a dry well.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]390.002600.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11981.01988.5[m ]32503.52519.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]23.0Cores 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 typeLaboratory1780.0[m]SWCSAGA1800.0[m]SWCSAGA1820.0[m]DCSAGA1823.0[m]SWCSAGA1830.0[m]SWCSAGA1840.0[m]SWCSAGA1850.0[m]SWCSAGA1858.0[m]SWCSAGA1863.0[m]SWCSAGA1868.0[m]SWCSAGA1882.0[m]SWCSAGA1892.0[m]SWCSAGA1907.1[m]SWCSAGA1925.0[m]DCSAGA1940.0[m]DCSAGA1955.0[m]DCSAGA1968.0[m]DCSAGA1981.9[m]CSAGA1989.0[m]DCSAGA1998.0[m]DCSAGA2008.0[m]SWCSAGA2027.0[m]SWCSAGA2037.0[m]SWCSAGA2058.0[m]SWCSAGA2080.0[m]SWCSAGA2102.0[m]SWCSAGA2111.0[m]SWCSAGA2133.0[m]SWCSAGA2147.0[m]SWCSAGA2160.0[m]DCSAGA2185.0[m]SWCSAGA2203.0[m]SWCSAGA2212.0[m]SWCSAGA2230.0[m]SWCSAGA2244.0[m]DCSAGA2268.0[m]SWCSAGA2297.0[m]SWCSAGA2313.0[m]DCSAGA2331.0[m]DCSAGA2346.0[m]DCSAGA2358.0[m]DCSAGA2376.0[m]DCSAGA2383.0[m]SWCSAGA2393.0[m]SWCSAGA2410.0[m]SWCSAGA2424.0[m]DCSAGA2439.0[m]DCSAGA2450.0[m]SWCSAGA2462.0[m]SWCSAGA2472.5[m]SWCSAGA2478.0[m]DCSAGA2499.0[m]DCSAGA2503.5[m]CSAGA2514.0[m]SWCSAGA2519.8[m]CSAGA2529.0[m]DCSAGA2544.0[m]DCSAGA2557.0[m]SWCSAGA2574.0[m]SWCSAGA2592.0[m]DCSAGA2600.0[m]DCSAGA -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2662661311142514251770177018231862186219371937193919721972201520322098209821862351 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.35 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.18 -
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]pdf48.65 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ACBL7001948CDL CNL GR19352596COREGUN19682583DIFL LSBHC CDL GR COREGUN9041963DIFL LSBHC GR19232596DIFL TEMP GR266886DIPLOG19482596FMT19732482GR270380MWD - GR RES DIR375920MWD - GR RES DIR10282600VSP2702591 -
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 typeCONDUCTOR30375.036380.00.00LOTSURF.COND.20905.026920.01.41LOTINTERM.13 3/81949.017 1/21965.01.82LOTOPEN HOLE2600.012 1/42600.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6331.159.030.0WATER BASED21.08.19859201.178.042.0WATER BASED21.08.198510281.1543.016.0WATER BASED27.08.198513381.1542.018.0WATER BASED28.08.198516351.2545.019.0WATER BASED29.08.198519651.3047.014.0WATER BASED30.08.198519651.3555.018.0WATER BASED02.09.198519651.2716.017.0WATER BASED05.09.198519661.2716.017.0WATER BASED09.09.198521181.2317.017.0WATER BASED09.09.198522001.2017.016.0WATER BASED09.09.1985 -
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]pdf0.27