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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较强的微观封闭能力,对于封闭陵三段中的天然气是十分有利的。本方法用于泥质岩盖层微观封闭能力的综合评价是可行的。
Based on the deep research on the micro-sealing mechanism of caprock and the main factors that affect the sealing ability, the authors selected the pressure difference of caprock / reservoir displacement, abnormal pore fluid pressure and abnormal gas concentration as the three micro-sealing capacity of mudstone caprock The main evaluation parameters. By classifying and assigning weights, we use the weighted method to get the comprehensive evaluation weight of the microscopic sealing ability of mudstone caprock, and establish a comprehensive evaluation method of microscopic sealing ability of mudstone caprock. Comprehensive evaluation of microscopic sealing ability of mudstone caprock of Meishan Formation of every tectonic unit in the southeast basin. The results show that the muddy rock caprocks of Meishan Formation have strong microscopic sealing ability in all tectonic units and are very favorable for the closure of natural gas in the third section of Lingling. This method is feasible for the comprehensive evaluation of microscopic sealing ability of mudstone caprock.