What is petroleum? It is a black viscous liquid mixture which is present in rock strata and can be extracted and refined to produce fuel, kerosene, diesel.
FORMATION OF PETROLEUM
Petroleum was formed over millions of years by decomposition of millions of dead microscopic marine algae, animals and plants which under great pressure heat and bacterial activity is converted to crude oil and natural gases.
COMPOSITION OF PETROLEUM
*Natural gases contains many methane and some ethane, propane and butane while crude oil contains alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, sulphur, nitrogen compound, oxygen compound, halogen.
Types of crude oil
Crude oil can be classified by their density or by their sulphur content.
We have
*crude oil with low sulphur and it is said to be sweet
*crude oil with high sulphur and it is said to be soured.
We also have light crude, medium crude,heavy crude ,extra heavy.
Light crude contains 31.1
Medium crude between 22.3& 31
Heavy crude 22.0
Extra heavy 10.0







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