page_title: OPEC
section_title: Crude oil benchmarks
hierarchical_section_title: OPEC / Market information / Crude oil benchmarks
caption_attribution_description: English: Some marker crudes with their sulphur content (horizontal) and API density (vertical) and relative production quantity
context_page_description: The Organization of the Petroleum Exporting Countries is an intergovernmental organization of 13 nations. Founded on 14 September 1960 in Baghdad by the first five members, it has since 1965 been headquartered in Vienna, Austria. As of September 2018, the 13 member countries accounted for an estimated 44 percent of global oil production and 81.5 percent of the world's "proven" oil reserves, giving OPEC a major influence on global oil prices that were previously determined by the so-called "Seven Sisters" grouping of multinational oil companies. A larger group called OPEC+ was formed in late 2016, to have more control on global crude oil market. The demand for OPEC oil has fallen to a 30-year low in second quarter of 2020.
  The stated mission of the organization is to "coordinate and unify the petroleum policies of its member countries and ensure the stabilization of oil markets, in order to secure an efficient, economic and regular supply of petroleum to consumers, a steady income to producers, and a fair return on capital for those investing in the petroleum industry." The organization is also a significant provider of information about the international oil market.
context_section_description: A "crude oil benchmark" is a standardized petroleum product that serves as a convenient reference price for buyers and sellers of crude oil, including standardized contracts in major futures markets since 1983. Benchmarks are used because oil prices differ (usually by a few dollars per barrel) based on variety, grade, delivery date and location, and other legal requirements.
  The OPEC Reference Basket of Crudes has been an important benchmark for oil prices since 2000. It is calculated as a weighted average of prices for petroleum blends from the OPEC member countries: Saharan Blend (Algeria), Girassol (Angola), Rabi Light (Gabon), Iran Heavy (Islamic Republic of Iran), Basra Light (Iraq), Kuwait Export (Kuwait), Es Sider (Libya), Bonny Light (Nigeria), Qatar Marine (Qatar), Arab Light (Saudi Arabia), Murban (UAE), and Merey (Venezuela).
  North Sea Brent Crude Oil is the leading benchmark for Atlantic basin crude oils, and is used to price approximately two-thirds of the world's traded crude oil. Other well-known benchmarks are West Texas Intermediate (WTI), Dubai Crude, Oman Crude, and Urals oil.
caption: Sulfur content and API gravity of different types of crude oil[citation needed]
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