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Sirikit Oil and Gas Field
The Sirikit Oil and Gas Field, also called S1, is Thailand's largest onshore oil field, discovered in 1981 and producing since 1982 in Kamphaeng Phet Province.
Sirri C Oil Field
Sirri C Oil Field, also known as Sirri Civand, is an offshore oil field in the Persian Gulf southwest of Sirri Island, Iran, producing since 1978.
Sitio Royalties Corp.
Sitio Royalties Corp. was a Denver-based oil and gas mineral and royalty company focused on the Permian Basin, traded on the NYSE as STR until Viper Energy acquired it in 2025.
Sitra Oil and Gas Field
The Sitra Oil and Gas Field is a producing oil and gas field in Egypt's north Western Desert, discovered in 1982 with its main Sitra 8 block.
Skarv field
Skarv is an oil and gas field in the Norwegian Sea, discovered in 1998 and produced through an FPSO vessel by operator Aker BP since 2012.
Skjold field
Skjold field (Danish: Skjoldfeltet) is an oil field in the Danish sector of the North Sea about 200 km west of Esbjerg, discovered in 1977 and producing since 1982 as a satellite to the Gorm field.
Skjold Oil and Gas Field
Skjold is an oil field in the Danish sector of the North Sea, discovered in 1977 and operated by TotalEnergies as a satellite of the Gorm field.
Skogul field
Skogul is a small oil field in the Norwegian North Sea, discovered in 2010 and operated by Aker BP, producing since 2020 via the Alvheim FPSO.
SLB OneSubsea
SLB OneSubsea is a subsea production and processing joint venture led by SLB with Aker Solutions and Subsea7, closed in October 2023 and headquartered in Oslo and Houston.
Sleipner Field
Sleipner is a group of gas and condensate fields in the central Norwegian North Sea, operated by Equinor, hosting the world's first industrial-scale carbon storage project since 1996.
Slickline
Slickline is a single-strand, nonelectric steel wire spooled from a surface winch that runs, retrieves, and actuates downhole tools in live oil and gas wells without a workover rig.
Slovnaft
Slovnaft is a Slovak oil refining and petrochemicals company based in Bratislava, operating the country's only large refinery and largest filling-station chain, majority-owned by Hungary's MOL Group since 2000.
SNEPCo
SNEPCo, Shell Nigeria Exploration and Production Company, is a wholly owned Shell subsidiary formed in 1993 that pioneered Nigeria's deepwater production at the Bonga field, offshore in the Gulf of Guinea.
Snorre field
Snorre is an oil and gas field in the Tampen area of the northern Norwegian North Sea, discovered in 1979 and producing since 1992 from Snorre A and Snorre B.
SOCAR Turkey
SOCAR Turkey, also written SOCAR Türkiye, is the Turkish arm of Azerbaijan's state-owned oil and gas company SOCAR, its largest asset being the STAR Refinery at Aliağa, opened in 2018.
Société des Hydrocarbures du Tchad
Société des Hydrocarbures du Tchad (SHT) is Chad's state-owned national oil company, created in 2006 to manage the government's oil interests, including a 25% stake in the Doba consortium acquired in 2014.
Société Nationale Des Pétroles Du Congo
The Société Nationale des Pétroles du Congo (SNPC) is the Republic of the Congo's state-owned national oil company, created by law in 1998 to manage the country's petroleum interests.
Solaris Energy Infrastructure
Solaris Energy Infrastructure is a Houston, Texas company, founded in 2014 and traded on the NYSE as SEI, that provides mobile power generation and oilfield logistics equipment.
Solveig field
Solveig is an oil field in the Norwegian sector of the North Sea on the Utsira High, discovered in 2013, producing since 2021, and operated by Aker BP.
Solvent dewaxing
Solvent dewaxing is a petroleum refining process that removes wax from lubricating oil stocks by solvent dilution, chilling, and filtration, giving the oil low-temperature fluidity and yielding slack wax.
Sonangol
Sonangol is Angola's state-owned national oil company, founded in 1976 after independence and headquartered in Luanda. It holds interests in the country's petroleum concessions and reported about $10.4 billion turnover in 2024.
Sonara
Sonara, short for Société Nationale de Raffinage, is Cameroon's national oil refining company, created in 1973 and operating the country's only refinery in Limbe.
Sonatrach
Sonatrach (سوناطراك) is the state-owned national oil and gas company of Algeria, founded in 1963. It is the largest oil and gas company in Africa.
Songfangtun Oil Field
Songfangtun Oil Field (宋芳屯油田) is a stratigraphically trapped oil field in the Songliao basin, Heilongjiang, China, producing from Cretaceous Putaohua sandstones as a peripheral Daqing field.
Sorochinsko-Nikolskoye Oil Field
Sorochinsko-Nikolskoye Oil Field (Сорочинско-Никольское месторождение) is an onshore oil field in Orenburg Oblast, Russia, north of Sorochinsk, operated by Rosneft's Orenburgneft and producing commercially since 1967.
Soroosh Oil Field
The Soroosh Oil Field (Persian: میدان نفتی سروش, formerly named Cyrus) is an offshore oil field about 85 km southwest of Kharg Island in Iran's Bushehr province, holding heavy crude.
Sorovskoye oil field
Sorovskoye oil field (Соровское месторождение) is an onshore oil field in the Salym district of West Siberia, Russia, discovered by Yukos in 2002 and developed by Rosneft companies.
Sour crude
Sour crude is crude oil containing more than 1% sulfur, which gives it a rotten-egg smell and requires special refining compared with low-sulfur sweet crude.
South Arne Oil and Gas Field
South Arne, also known as Syd Arne, is an oil and gas field in the Danish sector of the North Sea, discovered in 1969 and producing since 1999.
South Atlantic Petroleum
South Atlantic Petroleum (SAPETRO) is a privately held Nigerian oil and gas exploration and production company founded in 1995 by former defense minister General TY Danjuma.