天然气地球科学 ›› 2020, Vol. 31 ›› Issue (7): 923930.doi: 10.11764/j.issn.1672-1926.2020.04.030
席斌斌1,2(),申宝剑1,2,蒋宏1,2,杨振恒1,2,王小林3
Bin-bin XI1,2(),Bao-jian SHEN1,2,Hong JIANG1,2,Zhen-heng YANG1,2,Xiao-lin WANG3
摘要:
CH4-H2O-NaCl体系不混溶包裹体群被广泛应用于恢复天然气成藏期的捕获温度及压力。前人提出了针对富气端元包裹体和富水溶液端元包裹体的不同的捕获温压恢复方法。为对比2类包裹体捕获温压恢复的效果,在对前人方法进行梳理的基础上,以四川盆地南部YA井志留系龙马溪组黑色页岩中的石英—方解石为例,通过详细的岩相学分析,选择同一FIA(流体包裹体组合)的富气端元包裹体和富水溶液端元包裹体进行了捕获温度、压力恢复。结果表明:同一FIA的2类包裹体恢复的捕获温度、压力结果分布范围基本一致,呈现出捕获温度变化范围较窄(212.0~220.7 ℃)但捕获压力变化范围较大(90~152 MPa)的特点,表明流体压力在石英—方解石形成时可能存在较大的波动。上述流体压力的波动可能受脉体形成时有机质裂解增压以及裂隙多次张开—愈合的综合影响。
中图分类号:
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