对于裂缝性低渗透储层，由于其基质孔隙度小、渗透率低，天然微裂隙成为决定压裂液滤失的主要因素。

Micro fissure is a significant factor for determining the fluid loss in low-permeability fractured reservoir, due to its small porosity and low permeability in the matrix.

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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。

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.

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发现A区沙三段中亚段储集层发育大量天然裂缝，具有构造垂向上分带性及平面上分片性等特征。

It is found that a lot of natural fractures developed in the reservoir of middle es 3 in a area with the features of vertical zoning and plane parting on structure.

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