SNADD FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.SNADD FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.150Level 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
Snadd Formation
NameFrom the seal species Pusa hispida. The present formation corresponds to unit T1-4 or Aun Formation of earlier informal terminology.Well type sectionWell 7120/12-2 (Norsk Hydro), coordinates 71°07'30.03 "N, 20°48'19.0"E, from 2927 m to 2354 m (Fig 4.44) .Well reference sectionsWell 7120/12-1 (Norsk Hydro), coordinates 71°06'48.7"N, 20°45'20.1"E, from 3474 m to 2535 m.
Well 7120/9-2 (Norsk Hydro), coordinates 71°29'40.81"N, 20°42'05.38"E, from 3962 m to 2552 m (Fig 4.45) .ThicknessThe formation thins from 1410 m in 7120/9-2 to 944 m in 7120/12-1 . An apparently anomalous thin development of 573 m in 7120/12-2 reflects faulting out of approximately 400 m of the middle and upper parts of the unit.LithologyBasal grey shales coarsen up into shales with interbeds of grey siltstones and sandstones. Limestones and calcareous interbeds are relatively common in the lower and middle parts of the unit, while thin coaly lenses are developed locally further up. Distinctive dusky red-brown shales occur near the top of the unit. Lateral and vertical lithological variations may provide the basis for 2 to 4 member subdivisions or for the establishment of several formations.Basal StratotypeThe base represents a clear log break at the base of a 60 m shale interval above the mixed lithologies of the underlying unit. This is marked on logs by a sharp increase to a more uniform response in gamma ray, interval transit time and neutron porosity readings.Lateral extent and variationHigh rates of deposition occurred throughout the area and there was little differentiation between earlier negative and positive structural elements. The unit contrasts with under- and overlying sequences in terms of palaeogeographic controls on sedimentation patterns, perhaps reflecting updoming of northern shelf margins.AgeA Ladinian to early Norian age is suggested. Correlations around the Ladinian/Carnian transition suggest earlier deposition of coarse elastics in central than in southern parts of the Hammerfest Basin.Depositional environmentThe Ladinian sequence represents relatively distal marine environments in all wells, following a major transgressive pulse which submerged all structural highs and platform areas in the region. Input of storm-derived silts and sands from southern sources is indicated. The Carnian is marked by large-scale progradation of deltaic systems over the entire region.CorrelationThe Snadd Formation shows great similarities in age and development to the lower and middle parts of the Kapp Toscana Group of Svalbard (the Tschermakfjellet and De Geerdalen formations).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 15.11.19851106228526.12.19851106228521.07.19861106228507.10.20131101220303.08.2014733227407.05.2017686224029.10.1985613193309.07.20112563262522.07.20073145324226.09.19822173230020.10.19842552396212.10.19802535347411.09.19812354292716.04.198443548503.01.20112582357213.11.198579291623.08.1986792221028.09.19852793320009.03.20012223226515.07.20172211226013.01.19922635301511.11.19872191270719.09.20062202300605.10.20001202152419.10.20011303141808.01.20061180180825.11.20061244179423.12.20061281186813.01.20071286184404.01.20131208175426.12.20181306133028.09.2017697142514.05.20082259285521.04.20082266292020.10.19871438189312.10.20111330188830.12.19881612210507.03.20071002120601.12.20081026129926.02.199449450408.01.201662666308.01.201669072708.01.201674775413.05.2005960117209.02.201977988307.04.2019878108325.02.19882877430019.01.20172169250010.10.20141538159425.02.20142990324029.03.2005476113804.11.201551098522.11.2016510106005.10.201750975016.12.20131769185502.05.20112122222216.10.20122303240517.10.2014580185203.05.2015623185414.06.2015623192702.09.2015601181529.09.2015601198210.10.2016601198217.07.2017589184228.08.2017589216508.10.2018608190401.12.202050488225.05.201857072402.08.2016539146410.03.2008484189004.11.2008636200727.02.2014672202314.01.2009585185604.03.2016783172021.08.20081166201019.06.19881028164225.09.2011804114607.08.2013807116819.07.20081052169411.04.19881296187810.11.20141909278526.04.20121137151320.12.19891523243802.02.20011642225510.02.20011642222708.01.20011598171207.05.19901232159515.12.19931453184319.07.2021760120207.10.20171219150001.10.20181506163022.10.19882207355003.09.19871626336201.07.20201788189928.11.19881572180028.05.2021776163418.06.2014894109021.11.2018938170931.07.2019854160003.11.2013896206306.07.2014839173017.09.201377293016.05.201578084007.08.2014763110019.08.1989606160721.07.2014952188803.08.2017840121015.06.2019801116201.09.20177801168 -
Wellbores with cores
Wellbores with cores 13.11.1985528.09.19852119.09.20065508.01.2006225.11.2006014.05.20082721.04.20084713.05.20054804.11.20152622.11.2016302.09.2015125.05.20185210.03.20082204.11.20084214.01.20091419.07.20085320.12.1989602.02.20014322.10.1988903.09.19871521.11.201811231.07.201911619.08.19894