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作为油气储集层的有效封闭的盖层必须同时具备较强的微观封闭能力和一定的空间展布范围等两个条件。微观封闭能力的强弱主要与盖层的泥质含量和孔渗性有关，空间展布范围的大小与盖层的单层厚度有关。据此．可以将泥质含量、有效孔隙率、渗透率和单层厚度作为泥质岩类盖层的封闭性的主要评价参数。在正常情况下，上述这些参数可由实验室测得。在取心资料少或无取心地区可由测并资料计算得到，也可由地震资料间接换算出。本文主要介绍如何依据测井资料确定这几种参数的方法，并提出相应的评价标准和综合评价方法。
As an effective closed cap layer of oil and gas reservoirs, two conditions must be possessed, such as strong microscopic sealing ability and certain spatial distribution range. The strength of micro-sealing ability is mainly related to the muddy content and porosity and permeability of the caprock, and the size of the spatial distribution is related to the thickness of the caprock. Accordingly. Shale content, effective porosity, permeability, and monolayer thickness can be used as the main evaluation parameters for the seal of the muddy caprock. Under normal circumstances, these parameters can be measured by the laboratory. In the coring little or no coring area can be calculated from the measured data can also be indirectly converted from the seismic data. This paper mainly describes how to determine these parameters based on well logging data, and puts forward corresponding evaluation criteria and comprehensive evaluation methods.