In many marine creatures, however, the skeleton is composed of a mineral variety of calcium carbonate called aragonite.

然而，很多海洋生物的骨骼由一种叫作霰石的碳酸钙矿物变体组成。

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The food additive, Golden Doctors natural calcium carbonate, is a new variety of food additive in our country. It is a new kind of calcium nutritional supplement.

食品添加剂金医生牌天然碳酸钙是我国食品添加剂新品种，是一种新的钙营养强化剂。

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But the category of carbonate is variety, the reservoir space is complex and its heterogeneity is strong. So the reservoir prediction is very difficult.

但是碳酸盐岩岩石类型多样，储集空间复杂，非均质性强烈，储层预测的难度很大。

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