6508/5-1
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General information
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Wellbore history
GeneralWell 6508/5-1 was drilled on a structure located in the western part of the Helgeland Basin off shore Mid Norway. The primary target was sandstone of the Early/Middle Jurassic Ile Formation. The Ti1je Formation was a secondary target in the case of a shaled out Early/Middle Jurassic sequence acting as a seal.Operations and resultsWildcat well 6508/5-1 was spudded with the semi-submersible installation West Vanguard on 22 April 1987 and drilled to TD at 2589 m in the Triassic Red Beds. The hole was drilled without significant problems and without any signs of shallow gas. It was drilled with seawater and gel down to 961 m, and with KCl/polymer mud from 961 m to TD.The top prospect was encountered at 1778 m and cored. The cored section exhibited excellent porosities with an average of 32% and permeabilities of generally several hundreds of mD to tens of Darcies. From petrophysical log evaluation the whole of Ile Formation had a net to gross of 64% and the same porosity average as in the cored section using a 15% porosity cut off. The Tilje Formation also possessed excellent reservoir characteristics. Reservoir characteristics remained good in the Åre Formation and Red Beds with an average of 25% porosity at around 2500 m. Unfortunately there were no signs of hydrocarbons on the logs and no shows were recorded in any part of the well, except for cut fluorescence in sidewall cores in claystones from the Spekk and upper Melke Formations. The RFT tool was run from 1786 m in the Ile Formation to 2542m in the Red Beds with 13 pressure points acquired. A clear water gradient of 1.013 g/cm3 was established. Post-well organic geochemical analyses included in the well completion reports only partly considered migrated hydrocarbons/shows, but from rock-eval PI data the lack of shows were confirmed. These analyses also proved excellent source rock potential in the Spekk Formation, although more gas-prone than further to the west and south on Mid Norway. Coals of the Åre Formation were present with potential for gas. The well section was however immature for any petroleum generation all through. One conventional core was cut in the Ile Formation from 1786 m to 1804 m. No attempts were made to take fluid samples.The well was permanently abandoned on 24 may 1987 as a dry hole.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]980.002586.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11786.01798.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]12.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30519.036677.00.00LOTSURF.COND.20960.026975.01.50LOTINTERM.13 3/81589.017 1/21603.01.62LOTOPEN HOLE2586.012 1/42586.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL70015185ISF LSS GR519972ISF LSS GR9611603ISF LSS GR MSFL15902580LDL CNL GR519975LDL CNL GR NGT15902580LDL CNL NGL9611605RFT17862542SAT4502575SHDT15902581SWS00 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit433116311631427142714761527152715621580158016501710171017781824182419812229 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.38 -
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]pdf4.14pdf6.15pdf0.83pdf0.75pdf2.63 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4571.03WATER BASED25.05.198718551.2817.014.0WATER BASED25.05.198725861.2816.014.0WATER BASED21.05.198725861.2816.014.0WATER BASED21.05.1987 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1120.0[m]DCOD1130.0[m]DCOD1140.0[m]DCOD1150.0[m]DCOD1160.0[m]DCOD1170.0[m]DCOD1180.0[m]DCOD1190.0[m]DCOD1200.0[m]DCOD1210.0[m]DCOD1220.0[m]DCOD1230.0[m]DCOD1240.0[m]DCOD1250.0[m]DCOD1260.0[m]DCOD1270.0[m]DCOD1280.0[m]DCOD1290.0[m]DCOD1300.0[m]DCOD1310.0[m]DCOD1320.0[m]DCOD1330.0[m]DCOD1340.0[m]DCOD1350.0[m]DCOD1360.0[m]DCOD1370.0[m]DCOD1380.0[m]DCOD1390.0[m]DCOD1400.0[m]DCOD