Temperature, time, compaction, clay mineral composition and other rock influence parameters of diagenesis, constructing diagenesis index is used, good relationship between displacement pressure and diagenetic index of mudstone, realize the clay cap rock sealing capacity evaluation, especially on capillary pressure seal ability evaluation. Through the Tarim Lunnan Carboniferous mudstone applications, high linear correlation is found between the diagenetic index and displacement pressure, which could explain the fitting of the diagenetic stage (diagenesis index) to predict the capillary pressure sealing ability effective, so avoid a lot of pressure mercury test to evaluate the ability of mudstone cap rock capillary seal, should be widely applied.%利用温度、时间、压实、黏土矿物的组成等成岩作用影响参数,构建成岩指数.通过对黏土岩的成岩指数与泥岩的排替压力的良好的相关关系,实现黏土岩盖层的封盖能力评价.特别是对毛细管压力封闭能力的评价.该方法在塔里木轮南地区石炭系泥岩段的应用表明,成岩指数与排替压力之间具有较高的线性相关性,这可以说明从成岩阶段(成岩指数)的拟合来预测毛细管压力封闭能力是有效的.这样可以避免大量的压汞试验就实现对泥质岩盖层毛细管封闭能力的评价,值得推广应用.
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