North Sea Oil Discovery Announced

Published at 09:48AM - 13/04/16

A North Sea Oil discovery has been announced, proving further oil southwest of the producing Statoil operated Oseberg South field.

The news was announced by the Norwegian Petroleum Directorate (NPD), on behalf of  the fields operators Statoil. The oil major had been in the process of drilling two wildcat wells in Norwegian block 30/11.

North Sea Oil Discovery Announced

According to the NPD, the wells were drilled about 1.2 miles (2km) southeast of the 30/11-9 A discovery (Askja East) and 22 miles (35km) southwest of the Oseberg South facility in the North Sea.

The primary exploration target for wells 30/11-11 S and 30/11-11 A was to prove petroleum in Upper to Middle Jurassic reservoir rocks (Tarbert formation) in two nearby fault blocks. The secondary exploration target was to prove petroleum in Middle Jurassic reservoir rocks (Ness formation).

Mixed Results

Well 30/11-11 S encountered 82 feet (25m) of oil column in the upper part of the Tarbert formation, of which 72 feet (22m) had moderate to good reservoir properties. The well was drilled to a vertical depth and measured depth of 11,962 feet (3,646m) below the sea surface, and terminated in the Ness formation.

Statoil North Sea Exploration Map
Click To Enlarge

Well 30/11-11 A encountered a corresponding reservoir in the Tarbert formation, but it is aquiferous with traces of hydrocarbons. The well was drilled to a vertical depth of 11,939 feet (3,334 m), and a measured depth of 13,081 feet (3,987m) below the sea surface. It was terminated in the Tarbert formation.

Well 30/11-11 A is classified as dry.

Both wells proved sandstones with moderate to good porosity in the Ness formation, but these were aquiferous. Preliminary estimation of the size of the discovery in well 30/11-11 S is between 0.2 and 0.5 million standard cubic metres (Sm3) of recoverable oil.

Further Drilling

The NPD have said that the drilling campaign will continue with the same drilling facility, the Songa Delta, in the same production licence, with wildcat well 30/11-12 S and potentially 30/11-12 A if the structure warrants an appraisal well.

Songa Delta Drilling Rig

The Songa Delta is a semisubmersible drilling rig delivered, in 1981, from the Rauma-Repola Oy shipyard in Finland.

The driller has been designed to operate in a water depth of 2,300 feet (700m) and drill to a max doth of 25,000 feet (7,600m).