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Carbon is also found in coal, petroleum, and natural gas. Carbon is one of the most important elements on the periodic table (at least from the perspective of organic chemists!).
These hydrocarbons are typically present in petroleum at the following percentages: paraffins (15% - 60%), napthenes (30% - 60%), aromatics (3% to 30%), with asphaltics making up the remainder. The composition of petroleum is defined as laid out above, and it is this composition which gives the crude oil its properties.Raw petroleum is usually dark brown or almost black although some fields deliver a greenish or sometimes yellow petroleum.n actuality the chemical composition of petroleum in its raw state can vary extremely. This variation is the reason why petroleum composition differs so much in colour and viscosity between crude oil fields and geographical areas.