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根据岩心及薄片观察、实验分析、录井及测井解释,认为杨庄组、洪水庄组和馒头组是冀中坳陷中上元古界—下古生界碳酸盐岩潜山内幕最主要的盖层。盖层岩性以泥质岩为主,其次为泥质白云岩、泥质灰岩及致密白云岩或灰岩,孔、渗性普遍较差。盖层在宏观上受岩性、泥质含量、分布规模等因素的影响,微观上受突破压力、物性、遮盖系数等的约束。依据上述因素,将冀中坳陷碳酸盐岩潜山内幕盖层划分为4类。综合评价得出,杨庄组为Ⅲ类(中等)盖层、洪水庄组为Ⅱ类(较好)盖层、馒头组为Ⅰ类(好)盖层。
Based on the observation of core and thin slices, experimental analysis, well logging and log interpretation, it is concluded that the Yangzhuang Formation, the Hongshuangzhuang Formation and the Mantou Formation are the most obscure buried sites of the Middle-Upper Proterozoic-Lower Paleozoic carbonate rocks in the Jizhong Depression The main cover. The caprock is dominated by mudstone, followed by muddy dolomite, argillaceous limestone and dense dolomite or limestone, with poor permeability and porosity. The cap rock is macroscopically affected by such factors as lithology, shale content and distribution scale, and is constrained microscopically by breakthrough pressure, physical properties, and cover factor. Based on the above factors, the interior cover of carbonate buried hill in Jizhong Depression is divided into four types. The comprehensive evaluation shows that the Yangzhuang Formation is a type III (medium) cap, the Hongshuizhuang Formation is a type II (better) cap and the steamed bread is a type I (good) cap.