Mudstone, muddy limestone and gypsum act as good seals.
泥岩、泥灰岩和石膏组成良好盖层。
Many acid stimulation technologies have been done to muddy limestone reservoir in Huabei oilfield, but achieved a little.
华北油田泥灰岩储层曾进行多种类型的酸化增产改造工艺，但均未取得理想效果。
The upper part is a set of evaporite quasi-tidal sequence with clear cycles which is made up of middle-thin-bedded, gypsum-bearing muddy limestone and dolomicrite.
上部为中薄层状富泥的含石膏质夹层的泥质泥晶灰岩、微晶白云岩组成的旋回性清楚的似蒸发潮坪层序。
The occurrence is steady and the structure is simple with FM, JM types of coal, whose roof is limestone and siltstone and bottom is muddy siltstone and sandy mudstone;
赋存稳定，结构简单，煤种为FM、JM，煤层顶板为石灰岩、粉砂岩，底板为泥质粉砂岩、砂质泥岩；
The types of Carboniferous carbonate rocks in Tazhong area include grain limestone, grain dolomite and muddy to micritic dolomite.
塔中地区石炭系碳酸盐岩主要岩类为颗粒灰（云）岩和泥粉晶白云岩。
The types of Carboniferous carbonate rocks in Tazhong area include grain limestone, grain dolomite and muddy to micritic dolomite.
塔中地区石炭系碳酸盐岩主要岩类为颗粒灰（云）岩和泥粉晶白云岩。
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