Abnormal Concentration and Origin of Heavy Hydrocarbon in Upper Permian Coal Seams from Enhong Syncline, Yunnan, China

Coalbed gas （CBG） in Enhong syncline, eastern Yunnan China, is character- ized by high concentration of heavy hydrocarbon with the highest content of ethane, which is more than 30%. Some previous investigators paid much attention to the abnormal concentration of heavy hydrocar- bon in the CBG of Enh...

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