The difference between oil and crude oil
Oil is an industrial term, is relative to mineral resources, usually referred to as the petroleum industry, is a kind of mineral resources industry. In the course of petroleum exploration, oil reserves are calculated and determined according to the degree of exploration and proved situation. Oil reserves are the result of geological exploration and the amount of original mineral resources to be developed.
Crude oil is the oil that has been mined from the rock stratum and has maintained its original physical and chemical form. It is the primary product of the petroleum industry and has realized its use value. It is the result of oilfield development.
The term petroleum is often used to describe reservoir permeability, porosity, and reservoir grade. The term “crude oil” is often used in national statistics of crude oil production statistics, evaluation of physical and chemical properties of crude oil and used to describe recovery efficiency, recovery degree and oil recovery speed.
As a mineral resource, petroleum refers to the oil containing water and gas, and crude oil as an industrial product, in which the water and gas have been separated from the oil, is a qualified industrial product.
Oil is very rich in color, there are deep red, golden, dark green, black, brown red, to transparent; The color of oil is determined by the amount of gum and asphaltene it contains. The higher the content, the darker the color. Some Wells in Huabei Dagang Oilfield produce colorless oil, Karamay oil is brown to black, Daqing oil, Shengli oil, Yumen oil is black. Colorless oil is produced in California, Baku, Romania and Sumatra, Indonesia. The formation of colorless petroleum may be related to the adsorption of colloid and asphaltene by rocks during migration. But dark oil, of varying degrees, is overwhelmingly found in almost every major oil-bearing basin in the world.

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