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以中国东部某油田为例 ,讨论了注水开发对砂岩储层孔隙结构的影响。孔隙结构参数表明 ,注水后砂岩储层的喉道平均直径和喉道直径中值明显增加。孔喉分布的峰态表明 ,由于注水开发的影响 ,喉道的分选程度降低。注水后 ,砂岩储层的退出效率降低 ,最小可流动孔喉直径增大 ,这表示流动主孔喉向大孔喉方向移动 ,而且流动主孔喉控制的孔隙体积也增加了 ,从而导致渗透率提高。注水后砂岩储层的孔隙结构和非均质性均发生了极大的改变。这项研究结果对提高采收率 ,尤其是对制订三次采油方案具有十分重要的意义。
Taking an oilfield in east China as an example, the influence of waterflooding on the pore structure of sandstone reservoir is discussed. The pore structure parameters show that the mean throat mean diameter and throat diameter of sandstone reservoirs increase obviously after water injection. The kurtosis of the pore-throat distribution indicates that the degree of separation of the throat is reduced due to the influence of waterflood development. After water injection, the withdrawal efficiency of sandstone reservoirs decreases and the minimum flowable pore throat diameter increases, indicating that the main flow throats move toward the macro-throat and that the pore volume controlled by the main flow throats also increases, resulting in permeability improve. The pore structure and heterogeneity of sandstone reservoirs have changed greatly after water injection. The results of this study are of great importance for enhanced oil recovery, especially for the formulation of tertiary oil recovery programs.