泥质岩盖层微观封闭能力的综合评价方法及其应用

在深入研究盖层微观封闭机理及影响封闭能力的主要因素基础上，选取盖层／储层排替压力差、异常孔隙流体压力和异常含气浓度作为泥质岩盖层微观封闭能力的三个主要评价参数。通过对其划分等级，赋予权值，利用加权法求取泥质岩盖层微观封闭能力的综合评价权值大小，建立了一套泥质岩盖层微观封闭能力的综合评价方法，并对琼东南盆地各构造单元梅山组泥岩盖层微观封闭能力进行综合评价。结果表明，梅山组泥质岩盖层在各构造单元均具有

A Comprehensive Method for Assessing Shale Micro-sealing Capacity and Its Application

With further study on cap rock micro-sealing mechanism and main factors that influence the sealing capacity,three key parameters,namely displacement pressure difference between shale and reservoir,abnormal pore fluid pressure and abnormal gas-bearing concentration,are taken as the evaluation basis of shale micro-sealing capacity.This paper describes that the comprehensive method is set up to assess the shale micro-sealing capacity by taking count of weighted value of above mentioned three parameters,with which the composite assessment of cap rock micro-sealing capacity of Meishan shale in each structure of SE Hainan Basin has been done.It is shown that the micro-sealing capacity of Meishan shale in each structure is excellent, which is favorable for gas preservation in Member Linshan. It is considered that the method is feasible for comprehensive assessment of shale cap rook micro-sealing.