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Maloob Oil and Gas Field
Maloob is an offshore heavy-oil field in the Bay of Campeche, Mexico, discovered in 1979 and operated by Pemex as part of the Ku-Maloob-Zaap project.
Mamontovskoye Oil Field
Mamontovskoye (Мамонтовское) is a large onshore oil field in the Khanty-Mansi Autonomous Okrug of West Siberia, Russia, discovered in 1965, producing since 1970, and operated by Rosneft subsidiary RN-Yuganskneftegaz.
Managed pressure drilling
Managed pressure drilling (MPD) is an adaptive drilling process that precisely controls annular pressure throughout the wellbore, avoiding influx of formation fluids in narrow-window reservoirs.
Manantiales Behr Oil and Gas Field
Manantiales Behr is a conventional oil and gas field in Chubut, Argentina, discovered in 1928 and operated by YPF until its 2026 transfer to PECOM.
Manifa Oil Field
Manifa Oil Field is an offshore Saudi Aramco oil field in the Arabian Gulf north of Jubail, Saudi Arabia, and the fifth largest oil field in the world.
Mansouri Oil Field
Mansouri Oil Field is an onshore oil field in Khuzestan province, southwest Iran, about 40 km south of Ahvaz, discovered in the early 1960s and producing since 1974.
Margham Oil Field
The Margham Oil Field, also written Marghan, is an onshore gas and condensate field in Dubai, UAE, discovered in 1982 and Dubai's only commercial onshore reservoir.
Marine Gas Oil
Marine gas oil (MGO) is a low-sulfur distillate marine fuel for diesel engines and boilers, the standard compliance fuel in IMO sulfur Emission Control Areas.
Mariner Oil and Gas Field
Mariner is a heavy oil field on the East Shetland Platform in the UK northern North Sea, about 150 km east of Shetland, producing since August 2019.
Marjan Oil and Gas Field
Marjan (مرجان) is an offshore oil and gas field in the Arabian Gulf off northeastern Saudi Arabia, discovered in 1967, producing since 1973, and operated by Saudi Aramco.
Marlim Oil and Gas Field
Marlim is a giant deepwater oil field in the Campos Basin, about 110 km off Rio de Janeiro, Brazil, discovered by Petrobras in 1985 with peak production of 586,315 barrels per day in 2002.
Marmul Oil Field
The Marmul oil field is a heavy-oil field in Dhofar province, southern Oman, discovered in 1956, brought on stream in 1980, and operated by Petroleum Development Oman.
Marun Oil Field
Marun (Persian: مارون) is a giant onshore oil field in the Dezful Embayment of southwestern Iran, discovered in 1964 and producing mainly from the Asmari reservoir.
Mataripe Refinery
The Mataripe Refinery (Refinaria de Mataripe), formerly the Landulpho Alves Refinery, is an oil refinery in Bahia, Brazil, opened in 1950 and today the country's second largest.
Maya crude
Maya crude is a heavy, sour crude oil produced in Mexico by the state oil company Pemex, with an API gravity of 21 to 22 degrees and 3.4 percent sulfur.
Maydan Mahzam Oil and Gas Field
Maydan Mahzam is an offshore oil and gas field in Qatari waters, discovered by Shell in 1963 and producing since 1965, about 110 km northeast of mainland Qatar.
Mbede Oil and Gas Field
The Mbede Oil and Gas Field is an onshore oil and gas field in Nigeria's Niger Delta, operated by the Nigerian Agip Oil Company joint venture since 1972.
Measurement while drilling
Measurement while drilling (MWD) is a drilling technique that transmits downhole measurements, principally wellbore inclination and azimuth, to the surface in real time, typically by mud-pulse telemetry.
Melones Oil Field
Melones Oil Field is an onshore heavy-oil field in Anzoátegui state, Venezuela, discovered in 1955 by Mene Grande Oil Co. and currently operated by Territorio under a contract with PDVSA.
Mene Grande Oil Field
The Mene Grande oil field is an oil field on Lake Maracaibo in Zulia, Venezuela, discovered in 1914 and regarded as the country's first giant field.
Menzel Ledjmet Nord Oil Field
Menzel Ledjmet Nord (MLN) is an onshore oil field in Block 405a of Algeria's Berkine Basin, discovered in 1996 and producing since 2003, operated by Pertamina.
Meota East Colony Oil and Gas Pool
The Meota East Colony Sand Pool, code 100020, is a heavy-oil pool near Meota, Saskatchewan, produced by SAGD and operated by Strathcona Resources since 2020.
Meota Lloydminster Oil Pool
The Meota Lloydminster Oil Pool is an operating oil pool in Saskatchewan, Canada, discovered in 1974 and developed by steam injection in the Lloydminster heavy oil district.
Mero Oil Field
Mero (Campo de Mero) is a giant ultra-deepwater oil field in the pre-salt Santos Basin, about 180 km off Rio de Janeiro, discovered in 2010 and operated by Petrobras.
Mesaieed
Mesaieed (مسيعيد), also known as Umm Said, is an industrial city and port about 40 km south of Doha, Qatar, handling crude oil exports and refining.
Messla Oil Field
Messla Oil Field (حقل مسلة) is a major oil field in Libya's Sirt Basin, discovered in 1971 and operated by AGOCO, a National Oil Corporation subsidiary.
Miandoum Oil Field
Miandoum Oil Field is an onshore oil field in the Doba Basin of southern Chad, discovered in 1975 and the first Doba field to produce, in July 2003.
Microbial enhanced oil recovery
Microbial enhanced oil recovery (MEOR) is a petroleum engineering method that injects microorganisms and nutrients into oil reservoirs, where their metabolites mobilize residual oil; it is low-cost but rarely applied.
Microcrystalline wax
Microcrystalline wax (E 905), also known as petroleum wax, is a petroleum-derived wax with a dense, fine-crystal structure that makes it more flexible, adhesive, and crack-resistant than paraffin wax.
Midland Crude Oil
Midland crude oil, usually called WTI Midland, is unblended light sweet crude from the Permian Basin delivered at Midland, Texas, and since 2023 a grade in the Dated Brent benchmark.