The Tor Formation is a geological formation of late Campanian to Maastrichtian (uppermost Cretaceous) age. It forms the part of the Chalk Group in the North Sea. It is an important reservoir for oil and gas in fields such as Valhall. It overlies the Hod Formation. It underlies the Ekofisk Formation with local evidence of unconformity.[1][2][3]

Tor Formation
Stratigraphic range: Late Cretaceous Late Campanian–Maastrichtian
TypeGeological formation
Unit ofChalk Group
UnderliesEkofisk Formation
OverliesHod Formation
Thicknessup to 472 metres (1,550 ft)
Lithology
PrimaryChalk
Location
RegionNorth Sea
CountryDenmark, Norway & United Kingdom
Type section
Named forTor field
LocationWell 1/3-1. Norwegian sector

See also

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References

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  1. ^ NPD. "Tor Formation". NORLEX. Retrieved 25 August 2022.
  2. ^ British Geological Survey. "Tor Formation". The BGS Lexicon of Named Rock Units. Retrieved 26 August 2022.
  3. ^ Blinkenberg, K.H.; Anderskouv, K.; Sheldon, E.; Bjerrum, C.J.; Stemmerik, L. (2020). "Stratigraphically controlled silicification in Danian chalk and its implications for reservoir properties, southern Danish Central Graben". Marine and Petroleum Geology. 115. doi:10.1016/j.marpetgeo.2019.104134.