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四川盆地天然气中普遍含有较高浓度的Ｈ２Ｓ。作者在四川各时代气田采集气样近１２０个，分析了Ｈ２Ｓ含量资料、探讨了天然气中Ｈ２Ｓ浓度及其硫同位素组成与沉积地球化学相的相关性。研究表明，高硫化氢浓度和高δ３４Ｓ值均与碳酸盐—蒸发盐岩的分布有直接的成因联系。而与煤系、碎屑岩和非碳盐的海相地层形成的天然气中其硫化氢含量低、δ３４Ｓ值也低。据此，本文利用硫化氢硫同位素探讨天然气的来源及沉积环境
Natural gas in Sichuan Basin generally contains higher concentration of H2S. The authors collected nearly 120 gas samples from gas fields in various periods in Sichuan Province. The data of H2S content were analyzed and the correlation between H2S concentration in natural gas and its sulfur isotopic composition and sedimentary geochemistry was also discussed. Studies have shown that the high hydrogen sulfide concentration and high δ34S values are directly related to the distribution of carbonate-evaporite rocks. However, natural gas formed from coal strata, clastic rocks and non-carbonous marine strata has low content of hydrogen sulfide and low δ34S value. Accordingly, this paper uses hydrogen sulfide sulfur isotopes to explore the source of natural gas and sedimentary environment