Crude Oil Classification (I)

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Classification of crude oil: The properties of crude oil around the world vary greatly, and this is due to differences in its chemical composition and distillation profile, that is, to variations in the size and type of molecules that make up the crude oil. Crude oils with different properties and compositions require distinct treatment during extraction, storage, transportation, and processing in order to make rational use of resources and improve economic efficiency. Classification methods can be based on geology, chemistry, physics, and industry, etc. Chemical classification is generally preferred, followed by industrial classification. Chemical classification methods include: the key distillate characteristic classification method, the characteristic factor classification method (paraffinic crude oils, intermediate base crude oils, naphthenic crude oils), the correlation coefficient classification method, and the structural group composition classification method. Industrial classification (product classification): Classified by the relative density of crude oil – light crude oil (such as Qinghai crude and Karamay crude), medium-grade crude oil, heavy crude oil (such as Shengli and Gudao crude), and extremely viscous crude oil (such as Maerui oil)