流体包裹体在古压力模拟研究中的应用

APPLICATION OF FLUID INCLUSION IN PALAEOPRESSURE MODELLING RESEARCH

陈红汉 董伟良 张树林 杨计海

Chen Honghan Dong Weiliang Zhang Shulin Yang Jihai

烃类流体包裹体的最小捕获压力可以通过其在空间投影的等容线单值变化和等容线的物理特性来确定。南海琼东南盆地YC21-1构造崖城组砂岩中的方解石脉、石英次生加大边和颗粒裂纹中的流体包裹体反映,地史时期该区曾经发育过 4期流体包裹体,盖层在第三期热流体活动时期,曾发生过破裂,但稍后又快速愈合,从而未形成大量游离型天然气藏。

The minimum trapping pressure ratio of hydrocarbon fluid inclusions can be defined by their isochore single value variations in P-T space projection and physical property of their isochore. Calcite veins, quartz secondary enlarged margins and fluid inclusions in particle cracks in sandstones of Yancheng Formation of YC21-1 structure in Qiongdongnan(southeastern Hainan) basin of the South China Sea indicate in geologic history that four phases of fluid inclusions were developed in that region; the capping bed was once burst during the third mobile phase of thermo-fluid inclusions which would be healed soon after. Therefore, no many free-state natural gas reservoirs could be formed there.

10.11743/ogg20020302