NYGRUNNEN GP
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.NYGRUNNEN GPNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.122Level Indicates the lithostratigraphic unit's level. Legal values: GROUP, FORMATION, MEMBER.GROUP -
Level below
Level below Lithostrat. unit -
Description
Nygrunnen Group
NameThe group is named after a fishing bank to the NW of Sørøya, around 71°N and 21°E. The unit corresponds to T5 or the Kvaløy Group of earlier usage.Type areaThe most complete sequence seen in the Hammerfest Basin is in Block 7119/12. Blocks 7121/5 and 7120/12 show a thinner development more typical of central and southeastern basin areas.ThicknessThe group thins eastwards in the Hammerfest Basin from approximately 250 m in the type area to less than 50 m in easternmost wells and in locations near the southern margins of the basin. The only well drilled to date in the Tromsø Basin penetrated a 1200 m thick development assigned to the group, while wells on the Senja Ridge show a thin sequence, reflecting late Cretaceous structuring of the area.LithologyGreenish grey to grey claystones with thin limestone intervals in the Tromsø Basin and western parts of the Hammerfest Basin pass eastwards and southeastwards into more calcareous ( 7121/5-1 ) or sandy ( 7120/12-1 ) condensed sequences. The claystones are here assigned to the Kveite Formation , the condensed sequences to the Kviting Formation . Central wells on Tromsøflaket, e.g. in the 7120/9 area, show a transitional development with a lower Kviting limestone passing up into a Kveite shale. Further exploration may show the need for differentiation between sandy and calcareous units, but there is insufficient data at present.AgeThe group appears to represent remnants of a depositional sequence with an age span from late Cenomanian to Maastrichtian. The Tromsø Basin was a depositional centre throughout most of this period. Areas further east were either only transgressed at times of maximum sea level and/or display only condensed sections of the original sequence. The Campanian seems to be the most widespread age represented in wells.Depositional environmentOpen marine, deep shelf environments in the west passed into shallower starved shelf regimes (uplifted at times) in the east.CorrelationThis unit is not represented on Svalbard. The equivalent Shetland Group in mid-Norway shows a more complete development, reflecting continuous subsidence over large areas.SubdivisionSource-
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 03.12.2000603121516.07.19821809187509.09.19831375139311.09.19831332281525.09.19841447158510.10.1980810105812.09.19831202145617.02.2011612111628.03.19891560158523.03.19911443145006.06.19851183123002.05.19851081111722.07.20071137117630.11.20121256128908.10.1982992117021.08.1983947109209.06.19841312149610.09.19811056115029.07.198287796124.05.19831067120010.12.20071186127926.09.198296598420.10.19841072109708.09.198453169405.09.199064770312.10.198072574211.09.198170174505.05.198373886403.01.201176682602.03.20191200207227.10.19841016105214.04.19851068111228.09.19851005103606.07.198693497709.03.200184486505.08.198489493112.08.198688992315.07.201781187329.11.201190091011.11.199274376413.01.199282091011.11.198775991619.09.200679185210.10.202181585205.10.200058663519.10.200160063808.01.200663465025.11.200661562923.12.200664365513.01.200764365504.01.201362464526.12.201863667614.05.200879086021.04.200879086020.10.198757461812.10.201157560030.12.198856861707.03.200749953801.12.200852355307.09.201452255710.04.20141852189302.02.20211930197410.11.201451355805.10.19923752402722.09.20149881385 -
Wellbores with cores
Wellbores with cores 22.09.20140