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本文利用加水热压模拟实验的方法研究了碳酸盐岩、泥岩、油页岩和煤热解气中乙烷碳同位素随成熟度的演化规律，发现腐泥型热解气和腐殖型热解气的乙烷同位素具有明显的母质继承性，其分布具有明显的区别。即腐泥型热解气的乙烷碳同位素小于-29‰，而腐殖型热解气的乙烷碳同位素大干-29‰；从我国天然气乙烷碳同位素的统计结果看也有这-规律。因此，无论从模拟实验的范果，还是从实际统计的结果均说明以乙烷碳同位素-29‰可以作为区分腐泥型天然气和腐殖型天然气成因类型的标准。笔者应用这一标准研究了塔里木盆地天然气的成因类型，取得了良好的效果。
In this paper, the evolution law of carbon isotopes of ethane in carbonates, mudstones, oil shale and coal pyrolysis gas with maturity was studied by means of hydrothermal simulation experiments. It was found that saprophytic pyrolysis gas and humic heat Pyrolysis of ethane isotopes have obvious inheritance of parent material, the distribution has obvious difference. That is, the carbon isotope of ethane of pyrolysis gas is less than -29 ‰, while the carbon isotope of humic pyrolysis gas is -29 ‰. From the statistics of carbon isotopes of ethane in natural gas in China, . Therefore, no matter from the results of simulation experiments or from the actual statistics, it is indicated that the ethane carbon isotope of -29 ‰ can be used as a criterion for distinguishing types of sapropel gas and humus gas. The author applied this standard to study the genetic type of natural gas in the Tarim Basin and achieved good results.