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nature : liquid fuels a major categories. Natural and man-made petroleum oil (including synthetic oil). Usually refers to the natural oil, mainly from the lower strata of animals and plants and bacteria in the role, through a complex chemical changes and biological and chemical changes of Health formed. Often gathered in a pore or cracks in the rock (sand, sandstone, limestone, etc.). Drilling derived from mining. General can automatically emit ground; Low pressure reservoir or shallow reservoir pump can be used to exclude or gases (such as natural gas) or water out. The mining called crude oil (crude oil; Crude petroleum). Deep brown or green or brown. Yes various hydrocarbons (alkanes, cycloparaffins, aromatics), the complex mixtures, and contains a small amount of sulfur, oxygen and nitrogen organic compounds. The average carbon content of about 84% -85%. Average hydrogen content of about 12% -14%. The density of about 0.75. Heat value of about 43.54-46.05 MJ / kg (10400-11000 kcal / kg). 1129-hydrocarbon concentrations of the major categories can be divided into paraffin-based crude oil, naphthenic base crude oil and intermediate base. In addition, there are different mixtures of base oil. Crude oil distillation by direct or secondary machining process can be obtained gasoline, kerosene, diesel oil, lubricating oil, paraffin and asphalt, petroleum products can be made using solvents, resins, plastics, synthetic rubber, synthetic fiber. China's rich oil reserves, origin, Heilongjiang, Shandong, Xinjiang, Gansu, and Taiwan provinces. For the oil industry and the petrochemical industry for raw materials, but also can be used as fuel. According to China's Song Dynasty era (11th century) Yanan Shen Kuo see Shaanxi along with the people "fat" Water as a fuel in his book "Meng Xi Bi Tan," calling them "oil." This is our oil from the beginning of recorded words.
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