Delineation of the 16/2-5 P-Graben gas discovery in the North Sea


The well was drilled by the Deepsea Stavanger drilling facility. Photo: Odjell Drilling.

16/02/2023 Equinor Energy AS, operator of production licence 265, has concluded the drilling of appraisal well 16/2-23 S.

The well was drilled about 7.5 kilometres east of the Edvard Grieg field and 10 kilometres west of the Johan Sverdrup field in the North Sea.

The discovery was proven in 2009 in reservoir rocks presumably from the Jurassic/Triassic.

Before well 16/2-23 S was drilled, the resource estimate for the discovery was between 1 and 2.9 billion Sm3 of recoverable gas.

The objective of the well was to delineate the 16/2-5 discovery and to prove additional volumes of petroleum in a graben structure from the Jurassic/Triassic with better reservoir properties, in the southern part of the Utsira High.

The well encountered traces of hydrocarbons in conglomerate rock presumably from the Jurassic/Triassic with poor reservoir quality.

The reservoir interval in the 16/2-5 gas discovery was cored in the appraisal well, which encountered graben-filled sediments with a thickness of around 260 metres, with conglomerate rocks with poor reservoir quality. Traces of oil were encountered in an interval of around 80 metres.

The well is classified as dry with traces of hydrocarbons. Pressure points in the water zone confirm communication with the discovery in well 16/2-5, made in 2009.

The result of 16/2-23 S indicates that the resources have been considerably reduced compared with previous estimates. The revision of the volumes for the 16/2-5 discovery will be completed when final data from the well is available.

Extensive data acquisition has been conducted in the well. Hydrocarbon gradients could not be established, and no liquid samples were taken.

This is the 18th exploration well in production licence 265.

The well was drilled to a vertical depth of 2100 metres below sea level and terminated in conglomerates presumably from the Jurassic/Triassic.

Water depth at the site is 110 metres.

The well has been permanently plugged and abandoned. The well was drilled by the Deepsea Stavanger drilling facility, which will now drill wildcat well 35/10-9 in production licence 827 S, where Equinor Energy AS is the operator.

Map showing the location of well 16/2-23 S.



Ola Anders Skauby

Director Communication, public affairs and emergency response

Tel: +47 905 98 519

Updated: 16/02/2023

Latest news

Dry well in the North Sea
14/06/2024 The ”Toppand øst” well(35/11-29S) in the North Sea, drilled by Wellesley, Equinor and Petoro, proved to be dry.
Technology is the key
10/06/2024 Technology Day 2024 turned out to be exactly what the Norwegian Offshore Directorate was hoping for, with presentations and discussions about acquiring subsurface data, challenging barrels and next-generation production systems.
Our experts perform important work for the entire industry
07/06/2024 Experts in the Norwegian Offshore Directorate are key speakers at the EAGE technical conference. Here they’ll talk about scientific work that benefits the industry as well as the broader society.
Announcement of acreage for CO2 storage on the Norwegian Continental Shelf
06/06/2024 On 6th of June 2024, the Ministry of Energy announced three areas for CO2 storage pursuant to the CO2 Storage Regulations. These areas comprises defined blocks in the North Sea.
Many new mud volcanos discovered in the western Barents Sea
06/06/2024 As many as ten new mud volcanos have been proven in water depths of 440-480 meters in the western Barents Sea.
Drilling permit for well 6605/6-1 S
05/06/2024 The Norwegian Offshore Directorate has granted OMV (Norge) AS drilling permit for well 6605/6-1 S in production licence 1194, cf. Section 13 of the Resource Management Regulations.
The strike called off
05/06/2024 Starting Wednesday June 5th 23 employees in the Norwegian Offshore Directorate, that are members of the trade union Unio, are on strike. Update: On Wednesday morning, all employees are back to work as normal.
Large area with new released datasets in the Barents Sea
04/06/2024 The announced APA area in the Barents Sea has been expanded with 34 blocks, featuring good coverage thanks to recently released seismic data.
Dry well in the Barents Sea
30/05/2024 Exploration well 7219/6-1 “Venus” in the Barents Sea was dry.
Dry well in the North Sea
30/05/2024 Aker BP drilled the dry well 24/6-5 “Alvheim Deep” in the North Sea.