Crude oil is a mineral oil consisting of a mixture of hydrocarbons of natural origin, yellow to black in color, of variable specific gravity and viscosity. Crude oil type has a unique composition and is a complex mixture containing many thousands of hydrocarbon molecules of different shapes and sizes. Depending on the chemical nature of its chief constituents, crude oil is classified as paraffin base, asphaltic base, or mixed base. Crude oil is the mixture of petroleum liquids and gases (including impurities such as (sulphur) that is pumped out of the ground by oil wells.

Each crude oil type has unique molecular, chemical characteristics. No crude oil type is identical and there are crucial differences in crude oil quality. The results of crude oil testing provide extensive detailed hydrocarbon analysis data for refiners, oil traders and producers

Components of Crude Oil

Crude oil is essentially a mixture of many different hydrocarbons, all of varying lengths and complexities. In order to separate the individual components that make up the raw natural resource, the crude oil must be fractionally distillated so that chemical components can be removed one at a time according the their boiling points.