Ekofisk Formation

The Ekofisk Formation is a geological formation of Danian (lowermost Paleocene) age. It forms the uppermost part of the Chalk Group in the North Sea. It is an important reservoir for oil and gas in fields such as Ekofisk. It overlies the Maastrichtian Tor Formation with local evidence of unconformity. It underlies the Våle Formation.^[1][2][3][4]

Ekofisk Formation
Stratigraphic range: Danian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Chalk Group
Underlies	Våle Formation
Overlies	Tor Formation
Thickness	up to 150 metres (490 ft)
Lithology
Primary	Chalk
Other	Marl
Location
Region	North Sea
Country	Denmark, Netherlands, Norway & United Kingdom
Type section
Named for	Ekofisk field
Location	Well 2/4-5. Norwegian sector