Ansai oil field in Ordos basin is a ultra low permeability reservoir with natural and induced fractures, which caused serious lateral heterogeneity of permeability in the reservoir.
鄂尔多斯盆地安塞特低渗透油田由于存在天然裂缝或人工压裂裂缝，造成了储集层平面渗透率的方向非均质性。
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A parameter for quantitatively describing the lateral heterogeneity of reservoir permeability — heterogeneity factor is defined based on the percolation flow through porous media.