Petroleum is the hydrocarbon mixture produced in nature as liquid, or what results from refining it.
The natural liquid hydrocarbon mixture is called crude oil, and the crude oil is refined to make petroleum products like gasoline, naphtha, diesel, kerosene and heavy oil. This crude oil and the products, obtained by processing the crude oil, are called petroleum or petroleum products. (Refining: purifying substances by removing impurities contained therein)
The area in which petroleum is produced is called an oil field
It refers to an area where many oil wells are concentrated and crude oil is produced. As most crude oil is buried across a vast area, it is necessary to construct many oil wells in many locations of the oil field to produce large quantities of crude oil. In general, oil fields are named after the name of the place where the oil field is located. The offshore oil field in the North Sea between the UK and Norway is called the North Sea Oil Field.
The liquid hydrocarbon mixture obtained from the underground oil stratum is called crude oil.
Its main component is reddish brown or dark brown high-viscosity hydrocarbon mixed with sulfur, nitrogen, and oxygen. As for the properties of the reddish brown crude oil, according to the chemical petroleum specific classification system of the American Petroleum Institute (API), crude oil is classified into light oil if the specific gravity is greater than 33 degrees; intermediate oil if it is between 30 and 33 degrees; and heavy oil if it is lower than 30 degrees.
As crude oil has different properties depending on where it is produced and from which oil stratum it is, it is classified as follows: