Based on the relationship between sand porosity and wave impedance, we can use the sand wave impedance to estimate the sand porosity.
根据砂岩孔隙度与波阻抗之间的函数关系，可以利用砂岩波阻抗估算砂岩孔隙度。
The cooling rate is faster in chromite sand mold, but also causes more porosity in castings.
铬砂制作的砂模可让铸件有较快的冷却速率，但也产生较多的微孔隙。
Heavy oil reservoir of loose sand is of large porosity, loose cementation and higher clay content.
疏松砂岩稠油油藏孔隙度大，胶结疏松，粘土矿物含量偏高。
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