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.

• 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。