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目前中国大部分厚油层类油田已进入高含水开发阶段,水淹严重,剩余油高度分散。为明确曲流河点坝型厚油层的剩余油分布规律及其影响因素,在曲流河点坝内部构型分析的基础上,利用面控制建模方法建立点坝精细构型地质模型;并运用数值模拟方法,采用正交试验与单因素实验相结合,对曲流河点坝型厚油层剩余油分布进行研究。结果表明,曲流河点坝型厚油层剩余油整体分散,局部富集;剩余油主要分布于点坝顶部、侧积层遮挡部位以及井间水驱未波及区域;侧积层倾角、注水方式、侧积面曲率、侧积间距、井网以及侧积层连通性等因素均会对剩余油分布产生重要影响。正交试验结果表明,侧积层倾角越小,连通性越差,侧积间距越大,曲流河点坝型厚油层的开发效果越好。根据曲流河点坝型厚油层剩余油分布特征,可采取在其上部钻水平井、中部转换注水方式和下部调堵油水井的方式进行挖潜。
At present, most of China’s thick oil-rich oilfields have entered the stage of high-water development with serious flooding and the remaining oil is highly dispersed. In order to clarify the remaining oil distribution and its influencing factors in the meandering thick point reservoir of Qu River, based on the analysis of the internal configuration of the meandering point dam in the meandering river, the paper established the geological model of the fine structure of the point dam by using the surface control modeling method. By using the numerical simulation method, the orthogonal experiment and single factor experiment are combined to study the distribution of remaining oil in the thick point reservoir of the meandering river dam. The results show that the residual oil in the meandering point dam of the meandering river is dispersed and enriched locally. The remaining oil is mainly distributed in the top of the point dam, the concealed parts of the lateral strata and the undisturbed water flooding in the cross well. The dip of the side strata, , Side-area curvature, side-area spacing, well pattern and side-zone continuity all have important implications for remaining oil distribution. The results of orthogonal test show that the smaller the lateral ply angle, the poorer the connectivity and the larger the lateral product interval, the better the development effect of the meandering thick dam of the meandering river dam. According to the distribution characteristics of residual oil in the meandering thick point reservoir of Meandering River, tapping potentials can be taken in the way of drilling horizontal wells in the upper part, converting water in the middle part and adjusting oil-water wells in the lower part.