Sulphur Isotopic Compositions of Hydrogen Sulphides in Natural Gases and the Sedimentary Geochemical Facies
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摘要: 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。Abstract: High content of H2S exists universally in the natural gas in Sichuan Basin. The authors collectednearly 120 gas samples of different geological times from Sichuan and analysed their H2S contents,and inpart of the samples, the sulphur isotopic composition of hydrogen sulphides was also determined. Therelationship between the Hz S concentration,its sulphur isotopic composition in natural gases and the sed-imentary geochemical facies were discussed by combining with theH2S content data of the other oil-andgas-bearing besins in China. The results showed that high H2 conntrantion and heavy Saoncentrantions and heavy δ34S clueshave a formative relation with the distribution of carbonate rocks and evaporite rocks, while the naturalgases generated incal fo rmatio n,ccastic rocks or non-carbonate marine sedimentary stratum have a lowH2S oncentration and lighter δ34S value. Accordingly, the source and sedimentary environment of nat-ural gases were discussed in this paper by means of the〔haracteristics of the sulphur isotope of hydrogens ulphi de s.
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Key words:
- natural gas /
- hydrogen sulphide /
- sulphur isotope geochemical fades /
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[1] 1 Krouse H R ek Chemical and Isotopic evidence of thermuchexrical sulphate reduction by light drocarbon gases in deep car-bonate reservoirs. Nature. 1988.(333): 415-419.
2 沈平工先彬.徐永昌等.天然气同位素组成及气源对比.石油勘探与开发.1982, (6): 34-38. -
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