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In order to distinguish the source and migration direction of natural gas by geochemical characteristics of butane, the components and carbon isotopes of natural gas from major hydrocarbonbearing basins in China were analyzed. The results showed that: (1) Oil-type gas has i-C4/n-C4<0.8, δ13Cbutane <−28‰, δ13Ci-butane <−27‰, δ13Cn-butane <−28.5‰, whereas coal-type gas has i-C4/n-C4>0...
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