sparry calcite cement 粗粒方解石胶结物
The main type of carbonate cement was calcite cementing, with little ferrocalcite cement and rare ferrodolomite cement.
碳酸盐胶结的主要类型是方解石胶结，同时也含有少量的铁方解石和极少量的铁白云石胶结。
The remnant intergranular pores were filled with this kind of late calcite cement, which leads to a great decrease of the effective porosity.
这种后期的方解石胶结物主要充填剩余粒间孔隙，使储层的有效孔隙度大大降低。
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.
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。
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