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在深入研究泥岩盖层压力封闭形成的地质条件及地质历史基础上,提出了泥岩盖层压力封闭期的概念及确定方法。通过压力封闭期与烃源岩排气高峰期之间匹配关系的研究,阐述了对泥岩盖层压力封闭期研究的意义。以松辽盆地三肇凹陷青山口组泥岩盖层对侏罗系气源岩和自身生成天然气压力封闭有效性为例作了说明。
On the basis of studying the geological conditions and the geological history of pressure seal formation of mudstone caprock, the concept of pressure seal period of mudstone caprock and its determination method are put forward. Through the study of the matching relationship between the pressure closure period and the peak discharge period of source rocks, the significance of studying the pressure seal period of mudstone cap rocks is expounded. Taking the Qingshakou Formation mudstone in Sanzhao Sag, Songliao Basin as an example, this paper illustrates the effectiveness of the gas source rocks in the Jurassic and the natural gas pressure closure.