Because of complex pore structure in low permeability sandstone reservoir, it was quite difficult to identify oil or water layer and evaluate reservoir using normal methods.
低渗透砂岩油藏因其孔隙结构复杂，利用常规方法进行油水层识别和储层评价难度较大。
Some of the production Wells in Jianghan oil Region possess the geological features including low reservoir permeability, thin adjoining layer between water and oil layers, etc.
江汉油区部分油井具有油层渗透率低、油水层之间隔层薄等地质特点。
The effect of polymer solution on improvement of oil-displacement efficiency in high permeability layer is better than the effects in medium and low permeability layer.
聚合物溶液在模型高渗透层内提高驱油效率作用的效果要好于中、低渗透层。
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