泥岩盖层对各种相态天然气封闭能力综合评价方法探讨

在深入研究泥岩盖层对各种相态天然气封闭机理及影响因素的基础上，选取天然气通过泥岩盖层的渗滤速度，异常孔隙流体压力或孔隙水通过泥岩盖层的渗滤速度，异常含气浓度或天然气通过泥岩盖层的扩散速度作为主要评价参数，通过对其加权平均建立了泥岩盖层对各种相态天然气封闭能力的综合评价方法，并将其应用于松辽盆地大庆长垣以东地区深层泉一，二段泥岩盖层的综合评价中，其结果与该区深层天然气勘探成果十分吻合，充分证明了该方

Discussion on Method Evaluating Comprehensively the Ability of Mudstone Caprock Sealing Gas in Each Phase

Based on studying deeply the sealing mechanism of mudstone caprock to gas in each phase and their influence factors,through chosing the permeable of gas velocity,abnormal pore fluid pressure or the permeable velocity of gas in water phase,abnormal gas bearing concent ration or the diffusive velocity of gas through mudstone caprock.This paper established a method evaluating comprehensively the ability of mudstone caprock sealing gas in each phase.By the weighted mean value,applied it in evaluating comprehensively mudstone caprock of K q 1 2 in Daqing placanticline and its easterns .The results are identical to gas prospection results of the region,It testifies that the method is practicable.