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nature : embedded in the formation of flammable gas. Mainly low molecular weight alkanes mixture. Some contain nitrogen, carbon dioxide or hydrogen sulfide, etc.. Some also contain a small amount of helium. It is generally organic material decomposition by which biochemical role. Oil or coexistence with the cracks in rocks and empty, or to dissolve the state exist in groundwater. Drilling derived from the mining, transport tube. A dry gas and two wet gas. Dry natural gas rich in methane, can be used as fuel or used for the production of carbon black, ammonia, synthetic oil, methanol and other organic compounds in the raw materials. Wet gas contains a relatively large number of ethane, propane, butane and pentane, can cracker to produce ethylene and other chemicals as raw materials. Compressed natural gas liquefaction available, may also be used as fuel, with more helium gas can be used to extract helium.
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