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North Sea oil
North Sea oil is crude oil produced from the North Sea seabed since the early 1970s, beginning at Norway's Ekofisk field, and its Brent crude became a global price benchmark.
Nosrat Oil Field
Nosrat (نصرت) is a shared offshore oil field in the Persian Gulf about 35 km southeast of Iran's Sirri Island, an extension of Dubai's Fateh field discovered in 1981.
Nova Oil and Gas Field
Nova is a Norwegian oil field in the northern North Sea, operated by Harbour Energy and producing since 2022 as a subsea tie-back to the Gjøa platform.
Novo-Yelkhovskoye Oil Field
Novo-Yelkhovskoye oil field, also called the Aktaš-Novo-Yelkhovskoye field, is an oil field in Tatarstan, Russia, second largest in the republic by reserves, developed by Tatneft since 1961 with peak output in 1974.
Novoportovskoye Oil and Gas Field
The Novoportovskoye field (Новопортовское месторождение) is a large oil, gas, and condensate field on the southern Yamal Peninsula in Russia, discovered in 1964 and developed by Gazprom Neft since 2012.
Numbi Oil and Gas Field
The Numbi Oil and Gas Field is a Chevron-operated offshore oil field in Block 0 off Cabinda, Angola, part of the Greater Takula Area and producing since 1972.
Nuna field
Nuna is an oil field on Alaska's North Slope operated by ConocoPhillips, which achieved first oil in 2024 with an expected peak of 20,000 barrels per day.
Ocelote Oil and Gas Field
The Ocelote Oil and Gas Field (Campo Ocelote) is an oil field in the Llanos Orientales basin of Colombia, operated by Hocol since its discovery in 2007.
Och Oil and Gas Field
Och Oil and Gas Field is a light crude oil field in Mexican Gulf of Mexico waters, discovered in 1985, operated by Pemex, and developed with the Uech and Kax fields.
Ochigufu Oil Field
Ochigufu Oil Field is a deepwater oil field about 150 km offshore Angola, discovered by Eni in 2014 and producing 24,000 barrels per day since 2018.
Octli Oil and Gas Field
The Octli Oil and Gas Field is an offshore oil and gas field in shallow water off Mexico, discovered in 2017 and operated by Petróleos Mexicanos.
October Oil and Gas Field
The October Oil and Gas Field is an offshore oil field in the north-central Gulf of Suez, Egypt, discovered in 1977 and once Egypt's largest oil producer.
Oda Oil and Gas Field
Oda is an oil field in the southern Norwegian North Sea, discovered in 2011 and producing since 2019 through a subsea tieback to the Ula field.
Odoptu field
Odoptu (Одопту) is an oil and gas field on the northeastern shelf of Sakhalin Island, Russia, and one of three fields in the Sakhalin-1 project, producing since 2010.
Odudu Oil and Gas Field
Odudu is an operating oil and gas field in shallow water offshore Nigeria, in block OML 100 in the southeastern Niger Delta, operated by TotalEnergies.
Oeste de Atapu Oil and Gas Field
Oeste de Atapu is an offshore oil and gas field in the pre-salt section of Brazil's Santos Basin, about 200 km off Rio de Janeiro and operated by Petrobras.
Ofelia (oil field)
Ofelia is an oil and gas discovery in block 35/6 in the northern North Sea, proven in 2022 and developed as a subsea tie-back to the Gjøa field.
Offshore drilling
Offshore drilling, also called offshore petroleum drilling, is the extraction of oil and gas from wells beneath the seabed, first done in 1897 off Summerland, California.
Ogbele gas field
The Ogbele gas field is an onshore oil and gas field in Rivers State in the Niger Delta, Nigeria, operated by Aradel Holdings and producing since 2005.
Oil and gas industry in Ghana
The oil and gas industry in Ghana is an offshore petroleum sector producing from the Jubilee, TEN, and Sankofa-Gye Nyame fields, with output peaking in 2019.
Oil distillation
Oil distillation is the process that heats crude oil and condenses its vapor fractions at different boiling ranges; its crude unit is the first in virtually all refineries.
Oil in Kenya
Oil in Kenya refers to the country's petroleum resources, first discovered commercially at Ngamia-1 in the South Lokichar Basin, Turkana County, in 2012, with production planned from 2026.
Oil platform
An oil platform, also called an offshore platform, is a structure on the seabed that drills wells and extracts petroleum and natural gas from beneath the ocean floor.
Oil refinery
An oil refinery, also called a petroleum refinery, is an industrial facility that converts crude oil into products like gasoline, diesel, jet fuel, and asphalt through separation, conversion, and treatment.
Oil reserves in Saudi Arabia
Oil reserves in Saudi Arabia, also called Saudi oil reserves, are estimated at about 267 billion barrels of proven crude oil, roughly 17 percent of the world's reserves.
Oil reserves in Venezuela
The oil reserves in Venezuela, also called Venezuelan oil reserves, are the world's largest proven crude reserves at about 303 billion barrels, mostly extra-heavy oil in the Orinoco Belt.
Oil Rocks Oil Field
Oil Rocks (Neft Daşları) is an offshore oil field and settlement in the Azerbaijani sector of the Caspian Sea, where the world's first offshore well was drilled in 1949.
Oil spill
An oil spill, also called an oil slick, is the release of liquid petroleum into the environment, most often the ocean, from tankers, pipelines, offshore drilling, or natural seeps.
Oil well
An oil well is a hole drilled into the earth to find or produce crude oil or natural gas, passing from drilling through casing, completion, and production to plugging.
Oil-based mud
Oil-based mud is a drilling fluid with oil as the continuous phase and brine emulsified as droplets, used in rotary drilling for shale stability, lubricity, and high-temperature wells.