What is shale oil? What is the difference between shale oil and oil?

Shale oil is an oil resource stored in shale. Shale oil is oil, but it is different from ordinary oil storage places. Shale oil, also known as oil shale or oil shale, is an unconventional oil. The preparation method is thermal decomposition, hydrogenation or thermal dissolution of oil shale. This process converts organic matter in rocks into synthetic petroleum and natural gas raw materials. The obtained oil can be immediately used as fuel or used to provide oil refineries. The properties of raw materials can be changed by adding hydrogen and removing impurities such as sulfur and nitrogen. Its products can be used for the same purpose as crude oil.