【Key words】 methane carbon isotope； ethane carbon isotope； propane carbon isotope； deuterium isotope； mud logging； CRDS；
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Hydrocarbon source rocks by carbon isotope analysis results showed that with the increase of carbon isotope, ethane maturity turns heavy, just smaller influenced than methane.
烃源岩热解气碳同位素分析结果表明，随成熟度增大，乙烷碳同位素随之变重，只是受影响的程度比甲烷小。
They are different from each other in toluene contents, the carbon isotope composition of ethane and the nitrogen and mercury vapor contents, etc.
二者在甲苯、乙烷的碳同位素组成，氮气和汞蒸气含量等方面存在着一定的差异。
The carbon isotope correlation between ethane in the natural gases and source rock kerogens shows that the gases in the reservoirs were mainly derived from Permian strata.
天然气乙烷碳同位素与各层系烃源岩干酪根碳同位素值对比结果揭示普光气田天然气主要来自二叠系烃源层。
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