Oil is the most important power fuel in the world. It has the advantages of complete combustion, high calorific value and convenient transportation. In ancient times, asphalt was used in architecture and medicine. In modern times, the first important use of oil was as lamp oil for lighting. Later, the development of vehicles such as cars and planes promoted the development of petroleum processing industry.
In addition to gasoline, petroleum is also the source of petroleum gas, kerosene, diesel, lubricating oil, residue, etc. Ethylene, propylene, benzene, toluene and acetylene produced by oil and natural gas are important raw materials for modern chemical industry. In addition, the production of agricultural fertilizer is also inseparable from oil and natural gas.