Porosity is important for water-storage capacity, but for water to flow through rocks, the pore spaces must be connected.

孔隙度对地层储水能力尤为重要，但要让水能够从岩石中流出，孔隙之间必须相互连通。

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Resistance to flow may be high enough to cause microvoids and porosity.

流动阻力可能太高，从而导致微孔和多孔。

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Then this paper selects porosity, permeability, flow zone index and other parameters to carry on cluster analysis, divide flow units and establish identification index system of flow units.

在此基础上选取孔隙度、渗透率、流动层带指标等参数进行聚类分析，划分流动单元并建立流动单元判别指标体系。

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Wells in shale plays have to undergo a process known as fracturing to boost the porosity of the rock and to make oil and gas flow to the well head.

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However, the inherit low porosity of the shale also implies that once the initial gush dies down, the flow will become a trickle.

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