C. If water flows through a rock easily, it has permeability but low porosity.
如果水很容易的留过岩石的孔，就是有渗透性，但是多孔性很低。这个文章也没有说说。
2
This paper performs an acoustic parameters testing of 20 pieces of low porous and permeable rock sample of Well Fangshen 8 in Daqing Oil Field under the condition of fully saturated water and gas.
对大庆油田芳深8井20块低孔、低渗岩样，在完全饱和水和气的条件下进行声学参数测试。
3
The tunnel adverse geological faults include faultage, low strength, geological formation and development of loose, non-rock clay, high stress formation and water-rich strata.