NCS: More oil in the great Alvheim areaGeological development of the North Sea with 25/2-21 well location. Source co2storageATLAS Norwegian North Sea

NCS: More oil in the great Alvheim area

The Liatårnet prospect drilled by Aker BP proved oil in Early Miocene Skade Fm reservoir rocks.

25/2-21 encountered an oil column of about 28 m in sand layers of the Skade Fm with extremely good reservoir quality. The oil/water contact was not encountered.

The second exploration target consisted of a water-bearing sand layer of about 12 m, also with extremely good reservoir quality.

Preliminary estimates indicate the size of the discovery between 82 and 201 MMboe. The flow potential and recovery rate are uncertain and will have to be clarified before the preparation of a possible development plan.

The Skade Fm consists of marine sandstones with thin claystone interbeds. The formation often interfingers with the unnamed claystone of the Hordaland Gp. The formation is thought to have been deposited in an open marine environment as a response to a fall in sea level.

In the Miocene, a deltaic system had developed from the Shetland Platform towards the Norwegian sector of the North Sea, represented by the Skade and Utsira Fms. Due to major uplift and Quaternary glacial erosion of the Norwegian mainland, thick sequences were deposited into the North Sea during the Neogene. This led to the burial of the Jurassic source rocks to depths where hydrocarbons could be generated, and the seals were effective.

Lithostratigraphic chart of the North Sea. Source: co2storageATLAS Norwegian North Sea