AGAT FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.AGAT FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.2Level 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
Agat Formation
NameWell type sectionNorwegian well 35/3-4 from 3589 m to 3345 m, coordinates N 61°51'54.54", E 03°52'26.99" (Fig 5.19) , 95 m of cores, mainly from the lower half of the formation.Well reference sectionNorwegian well 35/3-5 from 3620 m to 3219 m, coordinates N 61°47'46.71",E 03°54'44.01" (Fig 5.20) . 65 m of cores from the upper part of the formation.ThicknessIn the type well the gross thickness of the formation is 244 m, and in the reference well 401 m. The gross thickness varies in that range in the wells in block 35/3.LithologyIn the type well the formation consists of white to light grey, fine- to medium-grained, moderately to well-sorted sandstones alternating with grey claystones. The sandstones are usually micaceous and glauconitic and sometimes contain small amounts of pyrite. The sandstones in the type well are carbonate- and silica-cemented in zones. In the reference well, the upper part of the formation consists of medium- and coarse-grained to pebbly sandstones and conglomerates alternating with dark grey claystones. The conglomerates are both matrix- and grain-supported. The claystones are often found as 0.5-5 m thick layers between the sandstones. They are dark grey, usually calcareous and contain varying amounts of siltstone. They may occasionally pass into light grey, micaceous, calcareous and glauconitic siltstones.Basal stratotypeThe lower boundary is defined where sandstones become the dominant lithology and is placed at the base of the first marked coarsening-upwards sandstone unit or distinct sand body. On logs it shows as an upward reduction in gamma-ray response (Fig 5.19) and (Fig 5.20) and most often an increase in velocity (Fig 5.20) .Characteristics of the upper boundaryThe upper boundary is placed at the top of the upper sandstone layer. This boundary is especially distinct on the gamma-ray log since the overlying sediments are dominated by calcareous shales with a low sandstone content. The overlying sediments are represented either by the Rødby Formation (well 35/3-1 and 35/3-2 ), or by the Svarte Formation (well 35/3-4 and 35/3-5 ), (Fig 5.19) . (Fig 5.20) .DistributionThe formation is encountered in the area around the Måløy Fault Blocks in Norwegian blocks 35/3-36/1 (Fig 5.21) and is expected to be present along the western boundary of the Fennoscandian Shield. It is assumed to pass into shales towards the west (Fig 5.21) .AgeAptian-Albian (possibly Early Cenomanian).Depositional environmentMarine environment influenced by gravity flows of sediment.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 26.10.19763805402026.10.19803528372206.06.19813345358331.03.19823219351002.04.20022955295801.10.20093596399804.04.20093015339111.11.19972658270307.02.20102975311425.04.20222871299206.04.20222626271814.06.19751218135827.10.19752815286525.03.20192564276606.01.20022555263226.09.20162428255423.11.19952564267028.12.19972700273011.02.19903179378030.11.199031793780 -
Wellbores with cores