STØ FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.STØ FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.159Level Indicates the lithostratigraphic unit's level. Legal values: GROUP, FORMATION, MEMBER.FORMATIONLithostrat. unit, parent The parent lithostratigraphic unit's official name. See also level. Will be empty if Level = GROUP. -
Level below
Level below Lithostrat. unit -
Description
Stø Formation
NameStø is a farm on the northern coast of Langøya in Vesterålen. Our use of the term corresponds to the description by Olaussen et al. (1984) and to the informal term T2-5.Well type sectionWell 7121/5-1 (Statoil), coordinates 71°35'54.88"N, 21°24'21.78"E, from 2445 m to 2368 m. All but the uppermost 3 m of the formation are cored in this well (Fig 4.48) .Well reference sectionWell 7119/12-2 (Statoil), coordinates 71°00'51.81"N, 19°58'20.81"E, from 1517 m to 1372 m. Most of the lower and upper thirds of the formation are covered by cores, although base and top are not represented (Fig 4.49) .Thickness77 m in the type well and 145 m in the reference well.LithologyModerately to well-sorted and mineralogically mature sandstones are dominant. Thin units of shale and siltstone are clear markers; phosphatic lag conglomerates occur in some wells, especially in upper parts of the unit.Basal StratotypeThe base is defined by the sharp transition from regular and serrated gamma ray patterns of the underlying unit to the blocky to smooth cylindrical patterns of this sequence. Density readings decrease upwards over the boundary, but this change is more gradual.Lateral extent and variationThe formation is thickest in southwestern wells, thinning generally eastwards. This pattern corresponds to that of the underlying Nordmela Formation . The entire unit may be divided into 3 depositional sequences, with bases defined by transgressive episodes. The basal sequence is only present in the western parts of the Hammerfest Basin. The middle (late Toarcian/Aalenian) sequence represents maximum transgression in the area. The uppermost Bajocian sequence is highly variable owing to syn-depositional uplift and winnowing and to later differential erosion.AgeA late Pliensbachian to Bajocian age is indicated by present data. The base is apparently diachronous, younging from west to east in the Hammerfest Basin.Depositional environmentThe sands in the formation were deposited in prograding coastal regimes, and a variety of linear clastic coast lithofacies are represented. Marked shale/siltstone intervals represent regional transgressive pulses in the late Toarcian and late Aalenian.Source-
Dalland, A., Worsley, D. and Ofstad, K. (eds.) 1988: A lithostratigraphic scheme for the Mesozoic and Cenozoic succession offshore mid- and northern Norway. NPD-Bulletin No. 4, 65 pp.
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Wellbores penetrating
Wellbores penetrating Wellbore nameWellbore completion dateTop depth [m]Bottom depth [m]27.11.2020910113003.12.20002447261025.09.19842748286810.10.19802658308826.06.19811372151712.09.19833144329917.02.20112296244828.03.19892211236523.03.19912692279409.07.20112071222106.06.19852285242702.05.19852386247022.07.20072564267830.11.20122893297908.10.19822408252221.08.19832150225609.06.19842889296910.09.19812092219029.07.19822081219024.05.19832192227710.12.20072264236026.09.19821840189620.10.19841971204808.09.19841568165512.10.19802047215211.09.19811892197805.05.19832158222003.01.20112165223002.03.20193343337527.10.19842318239614.04.19852480255728.09.19852369244506.07.19862323240009.03.20011880192805.08.19841849190812.08.19861882193815.07.20171911193911.11.19922068212013.01.19922326238611.11.19872015203819.09.20062048208810.10.20211891190514.05.20082091213121.04.20082095211112.10.20111259131230.12.19881399152108.01.201660561213.05.200587888309.02.201970170907.04.201975275926.12.19924521461130.09.20132898298525.02.19881951206202.07.20172556256830.11.20171618181317.01.20182243234810.10.201482887325.02.20142267229324.03.20121337141508.07.20131532160626.10.20181413147924.01.20121781185705.05.20141448152614.03.20211820189002.05.20111276135407.06.2022936101316.10.20121513164514.01.200950150804.03.201668270319.06.198889491925.09.201172777007.08.201372979011.04.19881194120210.11.20141539155324.03.20061142116622.02.20061142116620.12.19891275130002.02.20011361137910.02.20011361137908.01.20011362137807.05.19901073108315.12.19931270127822.03.20173417344801.10.20181341135522.10.19881999202203.09.19871437145501.07.20201621165728.11.19881379141728.05.202170771918.06.201484987121.11.201887790931.07.201979281103.11.201378079606.07.201471273614.04.20161373235414.04.201678986717.09.201366267916.05.201566868317.09.201766568807.08.201469670419.08.198956957721.07.201487690503.08.201777279215.06.201957758001.09.2017577583 -
Wellbores with cores
Wellbores with cores Wellbore nameWellbore completion dateCore length [m]03.12.20001425.09.19843310.10.198016426.06.19819012.09.19832623.03.1991409.07.20119506.06.198513802.05.19858022.07.200711008.10.19826921.08.19837809.06.19842010.09.19812829.07.198210524.05.19833626.09.19825208.09.19841412.10.19801211.09.19813005.05.19831827.10.19847514.04.19857728.09.19857606.07.19867509.03.20012805.08.19845512.08.19863315.07.20172113.01.19926511.11.19871910.10.2021730.12.19882809.02.2019426.12.19921630.09.20138125.02.198811130.11.20175310.10.20143925.02.20141924.03.20127626.10.20185524.01.20125405.05.20146914.03.20216002.05.20116007.06.20227616.10.20125819.06.19882111.04.1988020.12.1989908.01.20011122.10.1988503.09.19871228.11.19881831.07.20191606.07.20142417.09.20131617.09.20172307.08.2014803.08.201719