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In order to identify different types of mixed hydrocarbon gas and explore the application feasibility of electronic nose system in oil and gas exploration field,this paper adopted low temperature thermal analysis mixed hydrocarbon gas from the oil shale in two different areas and mixed hydrocarbons gas of artificial ratio as gas samples,analyzed these 3 kinds of mixed hydrocarbon gases qualitatively and quantitatively by a mass spectrometer.The analysis results showed that there was a large difference between the two regions and the artificial mixture gas,which belonged to 3 different types of mixed gas.