7125/1-1
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General information
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Wellbore history
GeneralWell 7125/1-1 was drilled in the Lopparyggen East area on the southern end of the Bjarmeland Platform towards the Nyslepp Fault Complex. The primary purpose of the well was to test for hydrocarbons in the Late Triassic/Early Jurassic sandstones of the Kapp Toscana Group. These were found hydrocarbon bearing in well 7124/3-1. A secondary objective was to test for hydrocarbons in the underlying Middle Triassic Kobbe Formation. In well 7124/3-1 weak oil shows were seen in sands from this formation.Operations and resultsWildcat well 7125/1-1 was spudded with the semi-submersible installation Ross Rig 30 November 1988 and drilled to TD at 2200 m in Triassic rocks. Drilling proceeded without significant problems. The well was drilled with spud mud down to 818 m and with KCl / polymer mud from 818 m to TD.There was no indication of shallow gas in the hole. The well proved a significant reservoir development in the Kapp Toscana Group where 130 m sandstone with good reservoir properties was indicated. Top of Kapp Toscana Group, Stø Formation, was encountered at 1399 m. Logs and RFT showed a thin oil zone of 1 - 1.5 m from 1403.5 - 1405 m. Oil shows were seen from 1402.5 m down to 1435 m in sandstones. In the interval 1405 -2200 pressure point measurements show a gradient of 1.14 SG, which indicate saline formation water. The Triassic Kobbe Formation was encountered at 2104.5 m. Gas was encountered in two thin sand intervals in the top of the Kobbe Formation. The upper sand interval (2105.1 m to 2107.8 m) has an average log porosity of 19 % and an average water saturation of 49 %. In the lower sand (2123.5 m to 2125.3 m) the corresponding values are 20.5 and 53, respectively. Gas shows and weak oil shows were observed in thin sand intervals down to 2140 m. One core was taken in the Hekkingen Formation cap rock from 1360 to 1371 m. A second core was taken in the Stø reservoir sandstone from 1406 m to 1434 m. A total of three Repeat Formation Tester (RFT) samples were recovered; an oil sample at 1403.8 m, a water sample at 1405.5 m and a gas/water sample at 2106.3 m.The well was permanently abandoned as a minor oil and gas discovery on 30 December 1988.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]820.002199.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11360.01368.0[m ]21406.01434.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]36.0Cores 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 typeLaboratory1370.5[m]CICHRON -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit276391568568597617617131413181344139913991521161221052105 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.28 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf2.01 -
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]pdf18.27 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST403645CST GR403645DIL LSS GR401816DIL LSS GR8042180LDL CNL GR8042181LDL GR401816MWD - GR RES4052200RFT HP14050RFT HP AMS14012138RFT HP AMS14012138SHDL AML GR8042183VSP4002184 -
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 typeCONDUCTOR30399.0360.00.00LOTINTERM.13 3/8802.017 1/20.01.20LOTOPEN HOLE2200.012 1/42200.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3141.06WATER BASED12.12.19883201.2520.05.3WATER BASED28.12.19884021.06WATER BASED12.12.19884041.06WATER BASED12.12.19886071.06WATER BASED12.12.19888181.2014.07.2WATER BASED12.12.19888181.06WATER BASED12.12.19889551.2011.05.8WATER BASED12.12.198812131.2516.07.2WATER BASED12.12.198813601.2516.05.3WATER BASED12.12.198813601.2515.06.3WATER BASED12.12.198814061.2513.06.8WATER BASED13.12.198814381.2517.07.2WATER BASED14.12.198815671.2513.06.3WATER BASED15.12.198815891.2515.06.3WATER BASED19.12.198817021.2514.06.3WATER BASED20.12.198817591.2518.06.8WATER BASED20.12.198818601.2518.06.8WATER BASED20.12.198819201.2519.06.3WATER BASED20.12.198820341.2520.07.2WATER BASED21.12.198820741.2520.06.3WATER BASED22.12.198821711.2520.07.2WATER BASED27.12.198822001.2519.06.3WATER BASED27.12.198822001.2520.05.8WATER BASED27.12.198822001.2520.05.3WATER BASED27.12.198822001.25WATER BASED28.12.1988 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1423.70[m ]1433.70[m ]1408.00[m ]1413.25[m ]1418.40[m ]1423.50[m ]1432.40[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]pdf0.24