Statoil proposes to develop Dagny oil and gas field in the Sleipner area of the Norwegian North Sea with a fixed platform and nearby Eirin gas field from the seabed. Dagny was discovered in 1974, Eirin in 1978.
Dagny field oil occurs in the Upper Jurassic Hugin formation at about 3,500 m. The field lies in 120 m of water 30 km north of the Sleipner A platform.
Statoil said recent appraisal drilling established connection between western and eastern parts of the field. The eastern structure is called Ermintrude.
Eirin is about 9 km north of the Dagny discovery well. Most of its gas is in the Upper Triassic Skagerrak formation at a depth of about 4,120 m, according to the Norwegian Petroleum Directorate.
Statoil said subsea Eirin wells will be tied back to the planned Dagny platform. Gas from the Dagny platform will flow through a tieback to Sleipner East field.
The company proposes to load oil onto shuttle tankers from the Dagny platform.
It estimates ultimate production from Dagny and Eirin at 300 million boe.
Statoil, which operates the fields with 58.5% interests, said it will make an investment decision in a year. It envisions the start of production in 2016.
Other provisional interests, subject to negotiation before the development decision, are ExxonMobil Exploration & Production Norway AS 33%, Total 6.5%, and Det Norske 2%.