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。
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