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在分析泥岩盖层浓度封闭机制及类型的基础上 ,研究了含有不同类型有机质的泥岩盖层在不同演化阶段的生油气特征及孔隙水的变化情况 ,确定了其存在相态 ,并分析了其在不同演化阶段的浓度封闭作用特征。结果表明 :生化阶段和高成熟—过成熟阶段 ,含腐殖型和含腐泥型有机质的泥岩盖层均具有较强的替代封闭作用 ;低成熟—成熟阶段早期 ,2种类型的泥岩盖层均具弱的替代封闭作用 ;成熟阶段高峰期—结束 ,含腐殖型有机质泥岩盖层具强的抑制封闭作用 ,而含腐泥型有机质泥岩盖层可能具有弱的抑制封闭作用或替代封闭作用。
Based on the analysis of the mechanism and type of mudstone caprock concentration, the characteristics of oil and gas evolution and pore water in mudstone caprock with different types of organic matter at different evolution stages were studied, and the existence phase state was determined and analyzed Concentration in different stages of evolution of the role of closure. The results show that mudstone caprocks with humus-type and sapropel-type organic matter both have a strong alternative sealing effect in biochemical stage and high mature-maturity stage. In the early stage of low maturity-mature stage, two types of mudstone caprock All of them have weak substitutional sealing effect. During the mature stage of the peak-end, the caprock containing humus-type organic mudstone has a strong inhibitory and sealing effect, whereas the caprock containing the sapropelic organic mudstone may have a weak inhibitory or alternative sealing effect .