HAVERT FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.HAVERT FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.58Level 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
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Description
Havert Formation
NameFrom the seal species Halichoerus grypus: The unit corresponds to unit T1-1 or the Svolvær Formation of earlier informal usage.Well type sectionWell 7120/12-2 (Norsk Hydro), coordinates 70°7'30.03"N, 20°48'19.00"E, from 3657 m to 3552 m (Fig 4.42) .Well reference sectionWell 7120/9-2 (Norsk Hydro), coordinates 71°29'40.81"N, 20°42'05.38"E, from 4956 m to 4806 m (Fig 4.43) .Thickness105 m in the type well and 150 m in the reference well.LithologyIn the type well the formation consists of medium to dark grey shales with minor inter-bedded pale grey siltstones and sandstones comprising two generally coarsening upwards sequences. The reference section further north in the Hammerfest Basin shows a more monotonous silty shale sequence with only a very weak upwards coarsening trend.Basal StratotypeThe base is defined by increasing gamma ray and decreasing density responses above underlying mixed clastic and carbonate sequences. In the reference well the base is also easily recognised as basal silty shales directly overlie a 6 m thick limestone bed.Lateral extent and variationPresent information suggests a fining trend from the southern margins of the Hammerfest Basin northwards. Thicknesses are moderate and show no marked trends.AgePalynomorphs suggest a Griesbachian to Dienerian age.Depositional environmentThe formation was deposited in marginal marine to open marine settings with coastal environments to the south and southeast.CorrelationPalynofloras and sequence development show similarities to the Vardebukta Formation of western Spitsbergen.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 15.11.19852373240326.12.19852373240321.07.19862373240320.10.19844806495611.09.19813552365716.04.1984992136623.08.19862786299308.01.20062212259525.11.20062217255020.10.19872671347512.10.20112606281426.02.19941008156908.11.19911002162308.01.20161302189507.04.20191895340517.07.20171886190328.08.20172218222701.12.20201459156402.08.20162075219510.03.20082674289504.03.20162735294419.06.19882663306725.09.20112555366619.07.20082930299211.04.19882913387720.12.19893984430007.05.19902638388415.12.19932804387919.07.20211729371128.05.20212447251919.08.19892512291921.07.20142758286515.06.201930604300 -
Wellbores with cores
Wellbores with cores 08.01.2006225.09.20112711.04.19883520.12.1989907.05.19901719.08.198919