1. Biodeposition into petroleum: It is considered that petroleum is formed by the long evolution of organisms in ancient oceans or lakes, which belongs to biodeposition into petroleum and cannot be regenerated;
2. Petrochemical oil: It is considered that oil is generated by carbon in the earth's crust, which has nothing to do with living things and is renewable. According to this theory, there is already a lot of carbon in the earth's crust, and some carbon exists naturally in the form of hydrocarbons. Hydrocarbons are lighter than water in rock crevices, so they permeate upward along rock crevices. Biomarkers in petroleum are caused by thermophilic microorganisms living in rocks.
At present, the first statement is widely accepted.
Extended data:
Petroleum is a kind of colored flammable liquid with special smell, which is mainly composed of hydrocarbons. Its main components are: oil (which is its main component), colloid (a viscous semi-solid substance), asphaltene (dark brown or black brittle solid substance) and carbon.
Petroleum is mainly used as fuel oil and gasoline, which constitutes one of the most important secondary energy sources in the world. Petroleum is also the raw material of many chemical industrial products, such as solvents, fertilizers, pesticides and plastics. It is called "the blood of industry".
References:
Petroleum-Baidu Encyclopedia