强水驱海相砂岩特高含水期剩余油分布预测研究

Research on predicting residual oil distribution of marine sandstone in ultra-high water cut stage with strong water flooding

随着海相砂岩油藏进入特高含水、特高采出程度开发后期,由于动态及静态储层非均质性的影响,剩余油分布更加复杂和零散,剩余油精准预测及挖潜的挑战逐渐增大,常规剩余油预测方法已经跟不上油田生产形势的需要。本文不同于传统方法将物性参数(驱油效率、残余油)假定为固定值,作者基于油藏岩心分析成果将物性参数表征为随水驱强度变化而变化的时变关系式,在主流商业软件中采用编程语言创新性开展储层参数时变的定量化表征,同时结合生产动态拟合和时移测井饱和度拟合双参数约束校正模型,有效提高了模型精度,在实际油田应用中取得良好的效果。

As the marine sandstone reservoir enters the late stage of ultra-high water cut and ultra-high recovery development,due to the influence of dynamic and static reservoir heterogeneity,the distribution of remaining oil is more complex and fragmented.The challenge of accurate prediction and potential tapping of remaining oil is gradually increasing.Conventional remaining oil prediction methods can not meet the needs of oilfield production situation.Different from the traditional method,which assumes the physical parameters(oil displacement efficiency and residual oil)as a fixed value.Based on the results of reservoir core analysis,this paper characterize the physical parameters as a time-varying relationship with the change of water flooding intensity.In the mainstream commercial software,the programming language is innovatively used to carry out the quantitative characterization of the time-varying reservoir parameters.At the same time,combined with the production dynamic fitting and the time-lapse logging saturation fitting,which effectively improves the accuracy of the model and achieves good results in the practical application of oilfield.