| 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 |
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.
References
- NPD. "Ekofisk Fm". Norwegian Petroleum Directorate Fact Pages. Retrieved 25 August 2022.
- British Geological Survey. "Ekofisk Formation". The BGS Lexicon of Named Rock Units. Retrieved 26 August 2022.
- DINOloket. "Ekofisk Formation". Stratigraphic nomenclature. Retrieved 26 August 2022.
- 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.