四川盆地高硫天然气成藏机理的同位素研究

发布时间：2018-04-21 14:18

本文选题：HS + TSR　；参考：《中国科学:地球科学》2017年02期

【摘要】：硫化氢形成机理对海相高硫天然气的勘探开发关系重大.研究的关键是直接测定自然界不同赋存状态(气、液、固)含硫物质的化学组成和同位素组成.为此,建立了利用MAT271型气体质谱计在线分析天然气中H_2S含量和不同含硫物质硫同位素组成的方法,开展了四川盆地包括烃源岩、储集岩、天然气、水溶气在内不同含硫物质的分析;对比分析结果表明,烃源岩中的含硫物质主要由BSR形成,天然气、水溶气和储集层中的含硫物质主要由TSR形成;对含硫天然气的碳同位素组成进行了系统分析,发现高含硫天然气甲、乙烷稳定碳同位素普遍呈倒转特征,其主要原因应与TSR有关;四川盆地不同层位的含硫物质硫同位素组成的地质实际分析表明,天然气中H_2S的硫同位素组成与同一层位或相邻层位的膏岩或卤水的硫同位素组成具有继承关系,表明H_2S形成和聚集具有自源-近源特征.
[Abstract]:The formation mechanism of hydrogen sulfide is of great importance to the exploration and development of marine high sulfur natural gas. The key to this study is to directly determine the chemical and isotopic compositions of sulfur-containing substances in different natural states (gas, liquid and solid). For this reason, a method of on-line analysis of H _ 2S content in natural gas and sulfur isotopic composition of different sulfur containing substances by MAT271 gas mass spectrometer was established, and the Sichuan Basin was developed including hydrocarbon source rock, reservoir rock and natural gas. The results show that the sulfur content in source rock is mainly formed by BSR, while natural gas, water soluble gas and sulfur in reservoir are mainly formed by TSR. The carbon isotopic composition of sulfur-bearing natural gas is systematically analyzed. It is found that the stable carbon isotopes of high-sulfur natural gas A and ethane are generally reversed, and the main reason should be related to TSR. The actual geological analysis of sulfur isotopic composition in different layers of Sichuan Basin shows that the sulfur isotopic composition of H _ 2S in natural gas is inherited from the sulfur isotopic composition of gypsum or brine in the same horizon or adjacent layer. It is shown that the formation and accumulation of H2S are self-source-near-source.
【作者单位】：中国石化石油勘探开发研究院;中国石化油气成藏重点实验室;中国石化石油勘探开发研究院无锡石油地质研究所;中国科学院兰州油气资源研究中心;
【基金】：国家重点基础研究发展计划项目(编号:2012CB214801) 石油化工联合基金项目(编号:40839910)资助
【分类号】：P618.13;P597

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