1. Crude oil refers to crude oil that is directly mined from underground or seabed, untreated, separated and purified by sulfur. Petroleum refers to natural gas, man-made petroleum and its refined oil. Before oil was processed, it was called crude oil, also called natural oil. The oil obtained by dry distillation, high-pressure hydrogenation and synthesis of coal and oil shale is called artificial oil. Crude oil is refined by distillation and processed into various fuels and lubricants, which are collectively called petroleum products. The process of processing crude oil and refining various petroleum products is called petroleum refining.

Second, crude oil generally refers to international crude oil, which has not been processed. The global unified price is based on the European market. Oil means processing, just like gasoline. The domestic market is dominated by refined oil, and the price will also be affected by the international market, but the situation in each country is different.