Oil
Description |
Petroleum (pronounced /pəˈtroʊliəm/)
is a naturally occurring, yellowish-black liquid found in geological
formations beneath the Earth's surface. It is commonly refined into various
types of fuels. Components of petroleum are separated using a technique
called fractional distillation, i.e. separation of a liquid mixture into
fractions differing in boiling point by means of distillation, typically
using a fractionating column. It consists of naturally occurring hydrocarbons of various molecular
weights and may contain miscellaneous organic compounds. The name petroleum
covers both naturally occurring unprocessed crude oil and petroleum products
that are made up of refined crude oil. A fossil fuel, petroleum is formed
when large quantities of dead organisms, mostly zooplankton and algae, are
buried underneath sedimentary rock and subjected to both intense heat and
pressure. Petroleum has mostly been recovered by oil drilling (natural petroleum springs are rare). Drilling is carried out after studies of structural geology (at the reservoir scale), sedimentary basin analysis, and reservoir characterisation (mainly in terms of the porosity and permeability of geologic reservoir structures) have been completed. It is refined and separated, most easily by distillation, into numerous consumer products, from gasoline (petrol) and kerosene to asphalt and chemical reagents (ethylene, propylene, butene, acrylic acid, para-xylene used to make plastics, pesticides and pharmaceuticals. Petroleum is used in manufacturing a wide variety of materials, and it is estimated that the world consumes about 95 million barrels each day. |
Companies making this product |
Saudi Aramco, Royal Dutch Shell, China National Petroleum Corporation, BP, Exxon Mobil, Total SA, Chevron Corporation, Lukoil, ONGC, Gazprom, Rosneft |