The 16/4-6 S discovery was proven in 2013 in Triassic reservoir rocks, and has been delineated by several wells. 16/4-11 was drilled about 2.5 kilometres south of the 16/4-6 S discovery well, 20 kilometres south of the Edvard Grieg field and around 190 kilometres southwest of Stavanger. Prior to the drilling of 16/4-11, the operator's resource estimate for the discovery was between 4-10 million standard cubic metres (Sm3) of recoverable oil and between 1 and 3 billion Sm3 recoverable gas.
The objective of the well was to delineate the southwest flank of the 16/4-6 S (Luno II) discovery, to investigate the reservoir properties in previously undrilled reservoir units, as well as to investigate the type of oil and total oil column in this part of the discovery.
Well 16/4-11 encountered a total oil column of about 20 metres in Triassic sandstones with good to very good reservoir quality. The oil/water contact was encountered at 1946.5 metres below sea level. The entire reservoir, including the water zone, mainly consists of sandstones with some conglomerate sandstone layers, and has a total thickness of about 400 metres with variable reservoir quality, primarily from moderate to very good.
Preliminary estimates place the size of the discovery between 5 and 13 million Sm3 of recoverable oil and between 1 and 3 billion Sm3 of recoverable gas. The licensees will evaluate the discovery as regards a potential development through linking the discovery to existing infrastructure on the Edvard Grieg field.
The well was not formation-tested, but extensive data acquisition and sampling have been carried out.
This is the fifth exploration well drilled in production licence 359, and the fourth well on the 16/4-6 S (Luno II) oil/gas discovery. The licence was awarded in APA 2005.
Well 16/4-11 was drilled to a vertical depth of 2450 metres below the sea surface, and was terminated in Triassic or Permian rocks. Water depth at the site is 100 metres. The well will now be permanently plugged and abandoned.
The well was drilled by COSL Innovator, which will now drill appraisal well 16/1-28 S on the 16/1-12 Rolvsnes oil discovery in production licence 338 C, where Lundin Norge AS is operator.