{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 303,
    "wlbName" : "8/9-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 8/9-1 is located in the Åsta Graben.\r\nIt was designed to test a salt structure in the central part of the\r\nNorwegian-Danish basin. The primary objective was to penetrate Basal Jurassic\r\nunconformity sands in a crestal position of the closure. The sands were\r\nestimated to have an approximate gross thickness of 60 m and were expected to\r\nbe Late Jurassic in age. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well is Reference Well for the\r\nFiskebank Formation.\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 8/9-1 was spudded with the\r\nsemi-submersible installation Ocean Viking on 22 December 1975 and drilled to\r\nTD at 2376 m in the Late Permian Zechstein salt. The well was drilled with salt\r\ngel down to 411 m and with a lignosulphonate / gypsum mud from 411 m to TD. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well penetrated fine-grained silty\r\nsandstone very rich in glauconite in the interval 1316 m to 1376 m in\r\nPaleocene. Net sand for the interval was 60 m and porosities derived from the\r\ndensity log and corrected for clay effects were in the range 16 % to 24 %. In\r\nthe interval 2124 m to 2149 m in the Late Jurassic a series of interbedded\r\nclaystones, siltstones and sandstones were penetrated. The only true sandstone\r\ninterval here existed between 2147 m and 2149 m where porosities ranged from 7\r\n% to 14% calculated from density - neutron cross plot. All other low GR and\r\npermeable intervals in the Late Jurassic section indicated porosities\r\nsubstantially less than this and corresponding sidewall cores showed tight\r\nsiltstones. In the Middle Jurassic the interval 2168.7 m to 2222.6 m was found\r\nto contain a sequence of predominantly interbedded sandstones, siltstones, and\r\nclaystones with occasional thin carbonaceous beds. The caliper indicated a net\r\nsand of approximately 25 m out of a gross interval of 54 m. The porosities in\r\nthis interval were exceedingly variable from one sandstone unit to the next and\r\nranged from 5 % to 26 %. The sands with the highest porosities occurred near\r\nthe top of the section between 2171 m a",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}