M油藏剩余油分布数值模拟研究

The Numerical Simulation Study of Remaining Oil Distribution in M Reservoir

M油藏储层物性较差,水驱开发效果不理想,为了改善开发效果,摸清剩余油分布状况,开展了数值模拟研究。利用ECLIPSE软件对M油藏储量、含水率及产量进行了历史拟合,储量拟合误差小于2%,含水率及产量拟合结果较好,得到可信的剩余油分布结果。剩余油分布影响因素分析表明,储层非均质性与井网完善程度等因素综合影响剩余油分布。模拟结果显示,纵向上B23、B14小层是剩余油集中分布的主力小层;平面上,受储层非均质性影响,注入水优先沿渗透率高的区域推进,低渗透带水驱效应相对较弱,造成剩余油分布较多;M油藏存在井距偏大及局部井网不完善等问题,造成剩余油大面积分布。

Mreservoir is low permeability reservoir, its reservoir physical property is poor, and water flooding effect is not ideal. In order to understand remaining oil distribution and improve development effect, numerical simulation was carried out. Black oil model of ECLIPSE was used in this study, history matching of reserves, moisture content and production has been done. Reserves has an error of 1.6%, which prove the geological model is reliable. Moisture content and production fitting results are good, so that reliable result of remaining oil distribution is obtained. Then effect factors was analyzed, the results show that the remaining oil distribution of M reservoir is mainly effected by reservoir heterogeneity and incomplete well pattern. The remaining oil vertically focus on the B3^2 and B4^1 layers, while horizontally mainly effected by reservoir heterogeneity caused by sedimentary microfacies, so that injection water prefer to flow through the area of high permeability. Affected by large well spacing and incomplete well pattern, the remaining oil by water flooding process is distributed in large area.