"Crude oil, which is produced by about 100 countries, comes in hundreds of varieties that differ by viscosity and sulfur content. list of 4 itemsend of list While all grades of crude oil are valuable, their differing properties make certain grades more sought after in some markets than others. Crude oils are rated as heavy or light based on their viscosities, or gravities. Crude is also classified by sulfur content, with high-sulfur grades called sour and lower-sulfur varieties referred to as sweet."
"Heavy, sour grades are more difficult and costly to refine into petroleum products such as gasoline, diesel, kerosene and jet fuel. Generally speaking, lighter and sweeter crude commands higher prices. Some countries and regions primarily produce certain grades. Canada mainly produces heavy, sour crude, for example, while African varieties tend to be lighter and sweeter. Popular light, sweet varieties include Saudi Arabia's Arabian Super Light, Iran's South Pars Condensate, Malaysia's Tapis Blend, and Australia's Cossack."
The United States' bid to control Venezuela's oil sector after abducting Venezuelan President Nicolas Maduro has shone a spotlight on Venezuela's crude. Crude oil is produced by about 100 countries and comes in hundreds of varieties differing by viscosity and sulfur content. Grades are classified as heavy or light based on viscosity and as sour or sweet based on sulfur; lighter, sweeter crude generally fetches higher prices while heavy, sour grades are costlier and harder to refine. Different regions favor different grades. Venezuela's estimated 303 billion barrels are largely heavy, sour crude in the Orinoco Oil Belt, requiring steam injection and diluents and significant investment to exploit due to degraded infrastructure and expertise.
Read at www.aljazeera.com
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