LYR FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.LYR FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.98Level 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
Lyr Formation
NameFrom the fish species Pollachius pollachius (pollack).Well type sectionWell 6506/12-1 (Statoil), coordinates 65°10'07.58"N, 06°43'44.07"E, from 3836 m to 3812.5 m (Fig 4.27) . No cores.Well reference sectionWell 6407/1-2 (Statoil), coordinates 64°47'50.61"N, 07°02'23.76"E, from 3526 m to 3510 m (Fig 4.28) . No cores.Thickness23.5 m in the type well and 16 m in the reference well.LithologyThe formation consists of light/medium grey to light greyish-green marls with interbedded carbonates.Basal StratotypeIn the type well the base is defined by a decrease of interval transit times shown by the sonic log. The gamma ray and the resistivity responses also decrease.
The base has been sampled in shallow cores from the eastern part of the Trøndelag Platform (Bugge et al. 1984), but logs and detailed descriptions are not yet available.Lateral extent and variationThe formation is encountered in all wells on Halten Terrace, but is absent on the Nordland Ridge and on structural highs on the Nordland Ridge and the Trøndelag Platform. The carbonate content is expected to decrease to the west in the Møre and Vøring Basins. The formation consists of very thin limestones with intraformational conglomerates on the eastern part of the Trøndelag Platform (Bugge et al. 1984).AgeValanginian to Early Aptian.Depositional environmentThe formation was deposited under open marine conditions.CorrelationThe Lyr Formation is comparable to the Valhall Formation11) (Deegan and Scull, 1977) in the central North Sea. It is also equivalent to the Leira Member on Andøya (Dalland, 1979).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.
Footnotes-
1) Åsgard Formation according to Isaksen, D. and Tonstad, K. (eds.) 1989: A revised Cretaceous and Tertiary lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin No. 5, 59 pp.
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Wellbores penetrating
Wellbores penetrating 11.12.20212313231812.07.20221635164805.07.19941100113717.11.20091953196318.01.202279781028.12.20181809184516.10.20231889190009.04.19954352437107.01.19963450436927.03.19964354437503.03.20064348436915.04.19974620462905.04.19974372438815.02.19994372438829.09.19974654479223.02.19985224523807.11.19984422443206.07.20004735474723.05.20004423443326.12.19994545455805.05.20154270429915.01.20194397441929.12.19873884390801.06.19883703373215.11.20023548357719.09.20063875389530.04.20024060407231.01.20074032405109.07.20133721373230.10.20153957397105.01.20194137416916.11.20184137416908.04.20074240424802.06.20054229425401.07.20074315432529.09.20134182420018.02.19913370341928.02.19913577360022.07.20144019404111.06.20143695372626.04.20143505351417.09.20153443349517.08.20153699372612.11.20153729374124.10.20203823385915.05.19833510352616.01.19843500352123.08.19963547357106.08.19822827284331.07.19832395241031.08.20092800281902.09.20092719273313.05.20102863290908.05.20112530253805.09.20191944195815.11.19853682371013.04.20113769379504.03.19883850387326.10.19841817183420.09.20073327332914.09.20084005412005.11.20084005411816.10.20163841385020.09.20163438344307.06.19924062409427.05.19971631163913.06.20093194319907.09.19841583159102.02.19851610162022.09.19921598160608.11.20191613162214.02.20221977199023.06.19902770282127.06.19921770180619.01.20162368237918.09.20152513251807.12.20181736174315.07.19991614162502.06.20101598163018.10.19881666170207.12.20004328435315.09.20094548457528.04.20104120413827.08.20134000402513.07.20184133414927.04.20184339438731.03.19883813384426.10.19914139416202.10.19924142416706.06.19964399442810.11.19964094413927.07.20014549457616.07.20064586459903.09.20124513454917.04.20184201422328.10.20194116414106.02.19853813383613.08.19853835385530.08.19883725374310.09.19934128416926.06.19954177422911.12.19954833490107.09.19964554457701.02.19974554457701.09.20094393440806.08.20094393440805.05.19943791384319.02.20083552360026.10.19903018308830.04.20043040316108.05.20083432356615.12.20092525253416.08.20132719284228.02.20172736289101.06.20193377342018.09.20213379341823.09.19993207322215.04.20013364337103.06.20013461347414.02.20023327333916.07.19913154317401.12.19843645368014.08.19973322332731.01.20042575264931.10.19822770278110.02.20142613261515.08.19852347235828.10.19972420243408.07.20012870288503.07.20072359237318.04.20082531253501.07.20152580260426.10.19802012203224.05.19871562158026.12.20123837385513.10.20203318338726.10.20135334563429.01.19922253234711.03.19932394240717.08.19952394240706.03.19942187232806.08.19952550259814.05.20001717179402.12.20001717179429.08.20011712178923.05.20011803190212.04.20022088222226.04.20022108232318.02.20031821204707.08.20032304236515.08.20062956310721.12.20082599267425.01.20092679276801.04.20102283237512.09.20131735183013.06.20143484353131.01.20173205331117.08.20183357341821.06.20131619165505.08.20191444149807.07.19832022206911.12.19933418353407.10.19963420353603.02.201320302264 -
Wellbores with cores
Wellbores with cores 11.06.20142322.09.19921