摘要
在研究泥岩盖层封气性的形成条件及演化特征的基础上,对3种类型泥岩盖层的封气性演化阶段进行了划分:既无生气能力又无异常孔隙流体压力的泥岩盖层,其演化不存在阶段性,仅有毛细管封闭;具生烃能力但不具异常孔隙流体压力的泥岩盖层,其演化可分为毛细管封闭和毛细管+压力封闭两个阶段;既具生烃能力又具异常孔隙流体压力的泥岩盖层,其演化可分为毛细管封闭、压力封闭+毛细管封闭+抑制封闭和毛细管封闭+替代封闭3个阶段.研究泥岩盖层封气性演化阶段,可以正确评价泥岩盖层的封气能力及其有效性.以松辽盆地三肇凹陷青山口组和泉头组一、二段两套泥岩盖层为例,讨论了泥岩盖层封气性演化阶段的划分及其意义.
Based on a study of gas confining origin and evolution of mudstone seals,three types of gas confining evolution have been recognized:(1)For the mudstone with neither gas generating ability nor abnormal pressure,its gas confining is only a capillary sealing,and there is no evolution stages. (2)For the mudstone with gas generating ability and normal pressure,there are two stages of gas confining evolulion,i.e.capillary sealing and,capillary+pressure sealing. (3)For the mudstone with gas generating ability and abnormal pressure,there may be three evolution stages of gas confining,i.e.capillary sealing,capillary+pressure+restraining sealing and capillary+replacing sealing.The study of gas confining evolution of mudstone seals can be used to evaluate gas confining ability and its efficiency.As a study case,this paper has discussed gas confining evolution stages and their significance for two mudstone seals of Qingshankou(K 1qn) and Quantou (K 1q 1+2 ) Formation in Sanzhao Sag,Songliao Basin.
出处
《中国海上油气（地质）》
2001年第2期148-152,共5页
China Offshore Oil and Gas(Geology)
