North Sea oil is a mixture of hydrocarbons, comprising liquid petroleum and natural gas, produced from petroleum reservoirs beneath the North Sea.
The Brent field was an oil and gas field located in the East Shetland Basin of the North Sea, 186 kilometres (116 mi) north-east of Lerwick in the Shetland Islands, Scotland, at a water depth of 140 metres (460 ft). The field operated by Shell UK Limited was discovered in 1971 and was once one of the most productive parts of the UK's offshore assets but has reached the stage where production is no longer economically viable. Decommissioning of the Brent field is complete with the exception of Brent C, which is producing from another field. The discovery well 211/26-1 was drilled in 1971 by the semi-submersible drilling rig "Staflo". This was a major surprise at the time as the nearest land in Scotland and Norway is composed of granite and other non reservoir metamorphic rocks.
The Brae field is a Scottish oil field. The name comes from a Scots language word for hillside. The field was discovered in 1974 by well 16/7-1 drilled by a semi-submersible rig Odin Drill for operator Pan Ocean.
Azeri–Chirag–Gunashli or Azeri–Chirag–Deepwater Gunashli is a complex of oil fields in the Caspian Sea, about 120 kilometres (75 mi) off the coast of Azerbaijan. It consists of the Azeri and Chirag oil fields, and the deepwater portion of the Gunashli oil field. An overall estimate of the area of the development is 432.4 square kilometres (167.0 sq mi). It is developed by the Azerbaijan International Operating Company, a consortium of international oil companies, and operated by BP on behalf of the consortium. The ACG fields have estimated recoverable reserves of about 5 to 6 billion barrels of petroleum. Peak oil production of 835,000 barrels per day (132,800 m3/d) was reached in 2010, however by the first quarter of 2022 production had declined to 434,000 barrels per day (69,000 m3/d), or about one-half of peak value. As of 2021, ACG oil accounted for 95% of all Azerbaijani oil exports.
The Forties Oil Field is the second largest oil field in the North Sea, after the Clair oilfield, which is located 110 miles east of Aberdeen. It was discovered in 1970 and first produced oil in 1975 under ownership of British Petroleum, now called BP.
Peregrino is an oil field located offshore of Brazil, east of Rio de Janeiro, in the southwest part of the Campos Basin area with about 2.3 billion barrels of oil in place within the sanctioned area. The oil field was discovered in 2004 and was formerly known as Chinook.
The Hutton oil field, located on the UK continental shelf, was the location for the first ever production Tension Leg Platform (TLP).
Tyra Field is the largest gas condensate field in the Danish Sector of the North Sea. It was discovered in 1968 and production started in 1984. The field is owned by Dansk Undergrunds Consortium, a partnership between Total, Noreco and Nordsofonden, and operated by Total. The reservoir depth is about 2,000 metres (6,600 ft) and it covers area of 90 kilometres (56 mi) in the water depth of 37–40 metres (121–131 ft). The Tyra field has a number of satellite fields, including Roar, Svend and Tyra Southeast fields.
The Panna-Mukta oilfield consists of two contiguous offshore oil fields to the northwest of Mumbai, India.
The Claymore oil field is located in Block 14/19 on the United Kingdom's Continental Shelf. It is 161 km (100 mi) northeast of Aberdeen in the Central North Sea. The field is named after a double-edged broadsword used by Highland Scots. Recoverable oil reserves were estimated to be 511 million barrels from an initial oil in place of 1452.9 million barrels. The field was developed through a large steel jacket platform standing in 110 m of water. A separate accommodation platform was installed in 1995. Fluid production was supported by gas lift and significant water injection. The production platform also supports production from the Scapa field, the Golden Eagle field and the Tartan field. Oil is exported to the Flotta terminal.
The Dan oil field is a large oil and associated gas field in the Danish sector of the North Sea, about 200 kilometres (120 mi) west of Esbjerg. Oil and gas are produced through a complex of offshore installations. The Kraka and Regnar fields are satellites to the Dan installations.
Alwyn North is a major oil and gas field in the United Kingdom sector of the northern North Sea, 160 km east of the Shetland Islands. The field was developed through two bridge-linked offshore platforms and a number of subsea satellite wellheads. Alwyn North has been producing oil and gas since 1987 and is still (2023) in operation.
The Skjold oil field is a crude oil and associated gas production field in the Danish sector of the central North Sea, close to the Danish-German median line. Production of oil started in 1982, peak oil was achieved in 1991 and production is expected to continue until 2038.
Halfdan is a significant oil and gas field in the south-western part of the Danish sector of the southern North Sea. The field has been in production since 1999. The Sif and Igor fields are satellites to Hallfdan.
The Siri oil field and its satellites, Nini and Cecille, are oil producing fields in the Danish sector of the southern North Sea. Operating since 1999 and 2003 they are the most northerly of Denmark's offshore oil assets located close to the Denmark-Norway median line.
The Valdemar oil and gas field is a crude oil and gas production field in the Danish sector of the central North Sea. Production of oil and gas started in 1993, peak oil was achieved in 2009 and peak gas in 2010. Production was suspended in 2019.
The South Arne field is a major crude oil and associated gas production field in the Danish sector of the central North Sea. Production of oil and gas started in 1999, and peak oil and gas was in 2000.
The Harald field is a gas and associated condensate production field in the Danish sector of the central North Sea. Production of gas and liquids started in 1997, and peak gas was in 1998. The Lulita field is a satellite of the Harald field.
Ravn is a marginal oil field in the Danish sector of the North Sea. It started operating in 2017, with oil exported to an installation in the German sector of the North Sea. Operations were suspended in 2020, and decommissioning is currently being planned.
