The porosity loss caused by cementation is 25.8% and 27.5% of the total porosity for the Chang 1—Chang 3 sandstones and the Chang 4+5—Chang 10 sandstones, respectively.
胶结作用导致长1—长3和长4+5—长10砂岩丧失的平均孔隙度分别占原始孔隙的25.8%和27.5%，碳酸盐是造成砂岩物性降低的主要胶结物。
This pore space is known as porosity and is expressed as a percentage of the total rock volume.
这个孔隙空间被称为孔隙度，用岩石总体积的百分比表示。
First, an empirical relationship formula between the effective porosity and total porosity of cement paste is given based on the experimental results of concrete.
首先，根据混凝土的试验结果给出了水泥石有效孔隙率与总孔隙率关系的经验公式。
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