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晋县凹陷高硫重质稠油中含硫甾烷的检出及其形成机制探讨

, PP. 864-871

Keywords: 含硫甾烷,短链甾烷,硫化,氢化,C-S键,H2S晋县凹陷

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Abstract:

?晋县凹陷高硫重质稠油饱和烃馏分中检出了异常丰富的含硫甾烷化合物.从结构上看,这些含硫甾烷是以噻吩形式并入到甾核D环上或者结合到侧链C-22位上的.结合文献中甲硫基甾烷和分子内含硫甾烷的报道,提出了含硫甾烷的四种形成机制和富硫沉积中甾类的成岩演化途径.甾类侧链上的烯键同时存在氢化作用和硫化作用两种过程:H2S或HS-的非生物化学氢化作用形成长链甾烷;硫化过程成功形成侧链含硫甾烷;环化或者硫化的不成功,则形成短链甾烷.这种侧链氢化/硫化机制,为晋县凹陷原油和烃源岩中高丰度短链甾烷(峰高超过规则甾烷和植烷以及正构烷烃)的发育提供了可能的成因线索.

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