19/11/2009 Marathon Petroleum Norge AS, operator of production licence 203, has completed the drilling of wildcat well 25/4-10 S. The well, which encountered oil, was drilled about six kilometres south of the production ship on the Alvheim field in the central North Sea.
The objective of the well was to prove petroleum in Upper Paleocene reservoir rocks (the Hermod formation). The well encountered oil in seven-metre-thick sandstones in the Hermod formation. Preliminary estimates of the size of the discovery are between 0.5 and 1.5 million standard cubic metres (Sm3) of recoverable oil. No formation tests were carried out in the well, but data acquisition and sampling took place. The licensees will evaluate the discovery to consider whether it can be produced to the production ship on the Alvheim field.
Well 25/4-10 S is the sixth exploration well in production licence 203. The license was awarded in the 15th licensing round in 1996. 25/4-10 S was drilled to a vertical depth of 2196 metres below the sea surface, and was terminated in Paleocene rocks (the Heimdal formation). The water depth at the site is 126 metres. The well will be permanently plugged and abandoned.
The well was drilled by the drilling facility Transocean Winner, which will now proceed to drill wildcat well 25/4-10 A in the same production licence.
Contact in the NPD
Eldbjørg Vaage Melberg, tel.+ 47 51 87 61 00