引起碳酸盐含量变化的正是其中的方解石胶结物的变化。
It is the calcite cementation that results in the variation of carbonate mineral contents.
由于方解石中也含有烃类包体，油藏形成期就应等于或晚于方解石胶结物的形成期。
As some oil enclaves were enclosed within calcite, the oil pool formation time should be equal to or later than calcite cementation time.
云冈石窟地区云冈组上段砂岩中碳酸盐胶结物的含量普遍在10%以上，其主要矿物成分为含铁方解石和含铁白云石。
Carbonate cement is universally more than 10% in sandstones of the upper Yungang formation in Yungang Grottoes area. It's mainly composed of ferriferous calcite and ferriferous dolomite.
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