Natural Gas, in the broad sense, refers to the Gas formed naturally in the strata. But usually, the term "only refers to the storage of natural gas in the deep strata is a kind of combustible gas rich in hydrocarbons (main component is methane (CH4)), and was buried in the ground of paleontological after one hundred million years of high temperature and high pressure, and so on, which formed a kind of high calorific value, stable combustion, clean environmental protection high quality energy and fossil fuels. It is the world's third largest energy source after coal and oil. It is a high-quality, clean fuel, widely distributed, low cost, minimal pollution.

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