利用洞穴次生化学沉积物进行古环境重建是第四纪全球变化研究的一个热点，而碳氧稳定同位素是最重要的气候替代性指标。

The carbon and oxygen stable isotopes have been considered to be the most effectual proxy indexes in reconstructing the paleoclimate of Quaternary.

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然后运用饱和烃、芳烃等生物标志化合物以及同位素分析等技术手段，判断油气来源以及经历的次生变化；

Then using techniques of biomarkers and isotopic analysis of saturated and aromatic hydrocarbons to determine oil and gas sources and secondary changes;

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然后运用饱和烃、芳烃等生物标志化合物以及同位素分析等技术手段，判断油气来源以及经历的次生变化；

Then using techniques of biomarkers and isotopic analysis of saturated and aromatic hydrocarbons to determine oil and gas sources and secondary changes;

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