TUXEN FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.TUXEN FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.175Level 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
Tuxen Formation
NameNamed by Jensen et al. (1986) from a bathymetric feature west of Blavandshuk, the westernmost point of Jylland.Well type sectionWell reference sectionsNorwegian well 2/11-1 from 3063 m to 2988 m, coordinates N 56°14'16.98", E 03°27'07.05" (Fig 5.12) . No cores.
Norwegian well 2/6-2 from 3935 m to 3864 m, coordinates N 56°30'48.90", E 03°42'39.66" (Fig 5.15) . No cores.ThicknessThe thickness of the formation varies from 1 m along structural highs to about 100 m in basinal areas. In the reference wells the thicknesses are 75 m ( 2/11-1 ) and 71 m ( 2/6-2 ). In the type well (I-1) the thickness is 88 m.LithologyThe formation is dominated by white to greyish-pink, calcareous claystones and marlstones. Along some of the structural highs the marlstones grade into purer limestones. Generally, the formation terminates vertically upwards with a chalk sequence containing subordinate marlstone layers. This chalk is white to pale orange or yellowish-grey, occasionally greenish and reddish. The marlstones are generally light grey to greenish-grey or olive-grey, but may be reddish-brown in some wells.
A 0.3-1 m thick, radioactive, marlstone bed is frequently encountered within the Tuxen Formation in the Danish sector where it is defined as the Munk Marl Bed. This characteristic unit has also been recognised in some wells in the central Norwegian sector (e.g. 2/1-2 , 2/1-3 , 2/1-8 , 2/6-2 , 2/11-7 , 6/3-1 , 16/8-1 and 16/10-1 ), (see also (Fig 5.15) . In the Norwegian sector, the Tuxen Formation above the Munk Marl Bed is often more calcareous than the rest of the sequence.Basal stratotypeThe lower boundary is defined as the base of an upward decrease in gamma-ray readings and an increase in velocity, reflecting the passage from the slightly calcareous claystones of the underlying Åsgard Formation up into the more calcareous claystones and marlstones of the Tuxen Formation (Fig 5.12 , 5.14 , 5.15). The transition is generally gradual in basinal areas. Purer limestones were deposited along some structural highs, causing more distinct log breaks.Characteristics of the upper boundaryUpwards, the Tuxen Formation is generally in contact with the micaceous claystones and organic-rich shales of the Sola Formation (Fig 5.12 , 5.14). This boundary is marked by an upward increase in gamma-ray readings and a decrease in velocity. Where the Sola Formation is missing, the Tuxen Formation is in contact with the marlstones of the overlying Rødby Formation (Fig 5.15) . The boundary is usually defined by an upward increase in gamma-ray readings.DistributionThe Tuxen Formation is widely distributed in the Norwegian and Danish sectors (Jensen et al. 1986). In the Norwegian sector it is developed in the Central Trough, along the Jæren High and in parts of the Norwegian-Danish Basin.
In basinal areas in the Norwegian-sector it interfingers laterally with claystones and marlstones of the Åsgard Formation (Fig 5.4 , 5.7).AgeLate Hauterivian to Late Barremian (Heilmann-Clausen 1987, Thomsen 1987).Depositional environmentDeposition was dominated by pelagic marl and chalk oozes, which covered large areas of the North Sea. The bottom waters were mainly well oxygenated (Jensen et al. 1986).Source-
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 27.05.19974556468531.07.19983935394222.07.20105346539816.09.20165529554008.03.19934694474602.08.20033948400114.11.19723755377529.03.19803579362503.08.19823785382505.04.19833797383312.08.19843853389723.11.19853678371306.07.19913852386708.03.19923881390014.01.19923914396407.05.19974155417310.02.19993153315807.03.20094149417628.02.20095785582005.09.20133310331713.07.20133296330508.11.20193895391119.02.19923281328514.05.20103500350304.11.19914678471415.07.19924678471410.07.19944494454424.05.20124560460524.07.20124560460522.02.20154263430405.09.20154857488618.01.19924083410825.05.19803864393513.04.19913081310931.03.19914584463413.09.19914163418217.06.19924333436207.08.19923263328109.06.19994372437927.04.19893759400022.01.19912936298404.07.20084259432315.02.20213687379903.10.19692988306311.07.19914070416823.12.19933854393507.03.20193090311414.09.19904253428226.02.19942668267028.06.19782683269120.08.19783070308407.02.19923050305830.11.19963360339627.10.20083390342229.12.20103162320821.08.19932882294813.03.20083163320425.04.19923140315304.07.19933281329131.12.20115112516216.07.20114888493529.08.19913362338506.11.19913586359617.03.19965655575328.03.20132013204201.07.19692679270017.03.19802599262606.10.20102950300918.12.20112907292227.10.20112757276324.05.20142179219704.03.20142438247316.07.20141864187704.01.20192774278206.05.19691615164503.01.20102917292916.05.20102704273029.05.20102924295218.07.20104312432927.11.20122720275324.03.19691985200530.06.19681665172421.05.20143082309815.04.201430803095 -
Wellbores with cores
Wellbores with cores 25.05.19809