关键词: 剩余油, 分布, 微观, 网络模型, 随机模拟

Abstract: Based on oriented percolation,this article is focused on construction of stochastic network model,which can truly characterize the features of pore structure and wettability of sand. With this kind of model,the microcosmic composition and distribution of residual oil is then simulated theoretically. And the effects of wettability on the micro-distribution of residual oil are also simulated and discussed with the help of the network model. The results of simulating with the model are quite consistent with the results of microcosmic experiment. It has been found with network simulation that within residual oil the microcosmic composition and distribution of oil blobs with various sizes have some statistic character. That means generally the single and double blobs are in majority but only a few large size blobs in residual oil. However, the amount of the large size blobs could be the major part in residual oil, especially with a low oil recovery. It is also proved that stochastic network simulation is quite fast and less restricted by conditions,and that the way can reveal a visible picture about the changeable processes of micro-displacement and the micro-distribution of residual oil. Therefore,stochastic network simulation could be a flexible and convenient method used for research of the microcosmic features of residual oil.

Key words: residual oil, distribution, microcosmic, network model, stochastic simulation