Johan Sverdrup Field, North Sea, Norway
Johan Sverdrup field consists of two discoveries, Avaldsnes and Aldous, located off the coast of Stavanger in the Norwegian North Sea. The discoveries are located in 110m of water. It is one of the largest discoveries made in the Norwegian Continental Shelf.
Exploration activities revealed that the two discoveries constitute one giant connected field. The discoveries were hence jointly renamed as Johan Sverdrup in early 2012.
The PL501 is operated by Lundin Petroleum (40%) with Statoil (40%) and Maersk Oil (20%) as partners. Statoil (40%) is the operator of PL265, with Petoro (20%), Det Norske (20%) and Lundin Petroleum (ten percent) co-owning the license.
Johan Sverdrup is expected to produce 120,000 to 200,000 barrels of oil each day. It is expected to account for more than half of Norway's oil production by 2040. First production from the field is expected in late 2017 and expected to last for nearly 50 years.
Details of the Avaldsnes and Aldous discoveries offshore of Stavanger
Avaldsnes was discovered in 2010 by the 16/2-6 well. The Aldous discovery includes Aldous Major South and Aldous Major North.
Aldous Major South was discovered in August 2011 by the 16/2-8 well. It was drilled to a depth of 2,083m and encountered an oil column of 65m.
Aldous Major North is a minor field, discovered by the 16/2-9S well. The well was drilled to a depth of 2,047m in September 2011. Lundin drilled the well to confirm an extension of the Aldous Major South field in the north.
Geology of the Johan Sverdrup field reservoir in Norway's North Sea
The field reservoir is made of lower Cretaceous / Jurassic age high porosity and permeability sandstones. It is a four-way dip closure located at a depth of 1,900m with normal pressure and temperature.
Reserves and quality of oil in PL501 and PL265 of the Norwegian field
Johan Sverdrup in PL501 is estimated 0.8 to 1.8 billion barrels of gross recoverable oil. In PL265, the field is estimated to contain 0.9 to 1.5 billion barrels of gross recoverable oil. Total reserves of the field are estimated at 1.7 to 3.3 billion barrels of gross recoverable oil.
The oil present at the field is highly mobile with low viscosity. It has an API of 28° and has a low gas / oil ratio.
Exploration and drilling at Avaldsnes and Aldous by Lundin
The first appraisal well, 16/3-4, confirmed the extension of the Avaldsnes discovery to the south-east. It was drilled to a depth of 2,020m and encountered a 13.5m thick oil column. Sidetrack to the 16/3-4 well, 16/3-4A, was drilled to examine the reservoir's quality. It was drilled to a depth of 1,934m.
The 16/2-7 appraisal well drilled to a depth of 2,500m established the extension of the Avaldsnes field. The sidetrack well, 16/2-7A, encountered a reservoir column of 25m. It was drilled 400m north-east of the 16/2-7 appraisal well.
One appraisal well, 16/2-10, has been drilled on the Aldous Major South discovery which confirmed its northern extension. An oil column of 50m to 55m thickness was encountered in Jurassic age sandstones. The well was drilled by Transocean Leader, a semi submersible rig.
In March 2012 Lundin completed the drilling of appraisal well 16/2-11, which encountered a 54m gross oil column. The well was drilled by the Bredford Dolphin semi-submersible drilling rig.
Field development agreement between partners and Johan Sverdrup PDO
In March 2012, the field partners signed a pre-unit agreement, under which they will cooperate in the development of the field. Statoil has been appointed as the operator of the field during this phase.
The partners will work towards the preparation and submission of a Plan for Development and Operation (PDO) for the field.
Johan Sverdrup is expected to be a stand-alone development, including various infrastructure facilities. It will act as a new processing and transportation hub similar to several other giant fields located in the region.