天然气包含Natural gas contains：（）

A、烃类：甲烷(主要)、乙烷、丙烷、丁烷、戊烷。Hydrocarbons: methane (mainly), ethane, propane, butane, pentane.

B、非烃类气体：硫化氢、二氧化碳、一氧化碳、氮气、氢气和水蒸气，惰性气体氦气、氩气。其他硫醇、硫醚、二硫化碳、羰基硫等有机硫化物。Non-hydrocarbon gases: hydrogen sulfide, carbon dioxide, carbon monoxide, nitrogen, hydrogen and water vapor, inert gases helium and argon. Other mercaptan, sulfur ether, carbon disulfide, carbonyl sulfur and other organic sulfide.

C、水或盐水，固体颗粒，需分离去除。个别含微量汞。Water or brine, solid particles, to be separated and removed. Some contain trace amounts of mercury.

D、开采工艺注醇等化学药剂，携带进入产气。Chemical agents such as alcohol injection in mining process are carried into gas production.