Natural gas: Natural gas is a gaseous fossil fuel, and its main component is methane. It mainly exists in oil fields and natural gas fields, and a small amount comes from coal seams. Natural gas, like crude oil, is also buried in underground closed geological structures, some of which are stored in the same horizon as crude oil, and some exist alone. For natural gas stored in the same horizon as crude oil, it will be mined together with crude oil. Natural gas is mainly used as fuel to produce carbon black, chemicals and liquefied petroleum gas. Propane and butane produced from natural gas are important raw materials for modern industry. Natural gas is mainly composed of gaseous low molecular hydrocarbons and non-hydrocarbon gases. With the accelerated implementation of natural gas price reform, the "Thirteenth Five-Year Plan" vigorously promotes the gradual approach of natural gas development expectations, and the recent increase in the use of natural gas in cooler weather, natural gas development will usher in a historic opportunity.