史江龙,李剑,史海龙,李志生,王婧雅,祁青山

• 1:中国科学院大学渗流流体力学研究所
• 2:中国石油天然气集团公司天然气成藏与开发重点实验室
• 3:甘肃省地质矿产勘查开发局第三地质矿产勘查院
• 4:中国石油华北油田勘探开发研究院

摘要(Abstract)：

根据天然气组分、稳定碳同位素和氢同位素等地球化学资料,对四川盆地高石梯—磨溪气田震旦系—寒武系天然气地球化学特征进行分析。结果表明:1震旦系、寒武系天然气均以甲烷为主,重烃含量偏低而非烃含量较高,为典型的干气;2研究区天然气热演化程度较高,震旦系天然气中部分乙烷发生裂解,导致残余天然气的δ13C2变重;3研究区天然气以正碳同位素序列为主,仅部分寒武系天然气的碳同位素序列发生局部倒转,可能是高热演化阶段下同源不同期气或同型不同源气混合所致;4氢同位素显示,震旦系沉积环境的水介质盐度高于寒武系,且震旦系天然气为震旦系烃源岩和寒武系烃源岩的混源气,而寒武系天然气母质来源为寒武系烃源岩。

关键词(KeyWords)： 地球化学特征;成因;天然气;高石梯—磨溪;四川盆地

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“大型气田形成条件、富集规律及目标评价”(编号:2011ZX05007)

作者(Author): 史江龙,李剑,史海龙,李志生,王婧雅,祁青山

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