刘纯刚,郭淑梅,徐艳姝,周海超
LIU Chun-gang1,GUO Shu-mei2,XU Yan-shu1,ZHOU Hai-chao3(1.Exploration and Development Research Institute of Daqing Oilfield Company Ltd.

• 1:大庆油田有限责任公司勘探开发研究院
• 2:吉林油田测井公司
• 3:大庆油田有限责任公司勘探开发研究院
• 4:大庆石油学院地球科学学院 黑龙江大庆163712

摘要(Abstract)：

在泥岩盖层对各种相态天然气封闭机理及形成条件研究的基础上,针对不同类型泥岩盖层对各种相态天然气封闭性演化阶段进行了研究。以松辽盆地北部三肇凹陷泉一段、泉二段、登二段和青山口组3套泥岩盖层为例,通过划分其对不同相态天然气封闭性演化阶段,研究其对各种相态天然气的封闭特征;通过其封闭性形成时期与沙河子组—营城组气源岩大量排气期之间的匹配关系,研究了它们在该区天然气聚集与保存中的作用。
Based on seal mechanism and formation condition of shale caprock to gas in each phase,seal evolution stages of different shale caprock to gas in each phase is divided.It is considered that shale caprock which has not ability of generating hydrocarbon and has not abnormal pore fluid pressure can seal gas in free phase and gas in water-dissolving phase,and evolution of its seal ability is divided into two stages.Shale caprock which has ability of generating hydrocarbon and has not abnormal pore fluid pressure can seal gas in free phase,gas in water-dissolving phase and gas in diffuse phase.Evolution of its seal ability is divided into three stages.Shale caprock which has ability of generating hydrocarbon and has abnormal pore fluid pressure can also seal gas in free phase,gas in water-dissolving phase and gas in diffuse phase,and evolution of its seal ability is divided into four stages.Study on evolution stages of shale caprock to gas in each phase can not only forecast change of seal ability of shale caprock to gas in each phase,but also study seal efficiency of shale caprock to gas in each phase.Taking shale caprock of K1q1+2,K1d2,and K1qn in Sanzhao Sag in northern Songliao Basin as examples,seal characteristics of their shale caprocks to gas in each phase is studied through dividing their seal evolution stages to gas in different phases,and their role in gas accumulation and preservation is studied through relation between formation periods of their shale caprocks to gas in each phase and expulsion period of a great deal of gas from K1sh+yc source rock.

关键词(KeyWords)： 泥质岩;盖层;不同相态;天然气;封闭性;演化阶段
shale;caprock;different phase;gas;seal;evolution stage

Abstract:

Keywords:

基金项目(Foundation): 国家“973”重大基础研究项目(2001CB209104)资助成果

作者(Author): 刘纯刚,郭淑梅,徐艳姝,周海超
LIU Chun-gang1,GUO Shu-mei2,XU Yan-shu1,ZHOU Hai-chao3(1.Exploration and Development Research Institute of Daqing Oilfield Company Ltd.

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