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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 524,
    "wlbName" : "25/6-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/6-1 was\r\ndrilled on the northeastern part of the Utsira High. The main objective of the\r\nwell was to test for hydrocarbons in a prospect west of the main fault in the\r\nsouthern part of the block. Primary targets were the Middle Jurassic reservoir\r\nsandstone belonging to the Vestland Group, which is partly eroded in this area,\r\nand the Early Jurassic Statfjord Formation sandstone. Secondary objective was\r\nthe Early Tertiary sandstone. The total depth target was to drill through a\r\nstrong seismic reflector between 2.5 and 2.6 second TWT. Shallow gas was\r\nexpected at 282 to 344 m and 395 m.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 25/6-1\r\nwas spudded 18 December 1985 by Wilh. Wilhelmsen's Offshore Services\r\nsemi-submersible installation Treasure Saga, and completed 3 February 1986 at a\r\ndepth of 2881, 30 m into rocks of probably Early Palaeozoic/Pre-Cambrian\r\nage. The well was drilled with seawater\r\nand hi-vis pills down to 260 m, with bentonite gel mud from 260 m to 1028 m,\r\nwith gypsum/polymer mud fro 1028 m to 2195 m, and with bentonite gel / polymer\r\nmud from 2195 m to TD. No shallow gas was encountered.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe\r\nQuaternary/Tertiary sequence was 2017 m thick, and consisted of the Nordland,\r\nHordaland, and Rogaland Groups. The Nordland Group was marine claystone with\r\nsands frequently developed, especially in the lower part, with 163 m of the\r\nsandy Utsira Formation. The Hordaland Group was clay/claystone with some thin\r\nsand units. Slightly tuffaceous claystone and a lower sand/marl/ claystone\r\nsequence were the main lithologies of the Rogaland Group. A 65.5 m thick\r\nCretaceous sequence represented by Shetland and Cromer Knoll Groups was\r\npenetrated. The main lithology was chalky limestone, calcareous claystone\r\ngrading to marl and minor sand.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Jurassic\r\nsediments represented by the Viking, Vestland, and Dunlin Groups and the\r\nStatfjord Formation were encountered at 2233.5 m.\u00A0 Top Vestland Group was at 2277 m and top Statfjord Formation",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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