油藏渗流地球物理新方法探索

A novel technology: reservoir seepage geophysics

老油田进入高含水开发阶段后,随着注水倍数即PV(Pore Volume)的增加,油藏储层物性如孔隙度、渗透率、泥质含量等均随之发生改变,导致渗流场发生变化,剩余油分布预测更为困难,难以给出提高采收率的针对性措施。为此,提出油藏渗流地球物理新方法。通过分析不同注水倍数下储层孔隙度、实际油藏不同开发阶段泥质含量、剩余油饱和度等的变化,论证了发展油藏渗流地球物理技术的可行性和必要性,并形成了一套技术流程,即在岩石物理实验基础上,应用时移地震、时移VSP、时移电磁、生产测井、多域试井等地球物理技术研究油藏渗流场,最终建立多维油藏渗流地球物理地质模型,反映油藏渗流变化。油藏渗流地球物理技术是油藏地球物理技术的延续和提升,将在老油田渗流场重构、提高采收率方面发挥重要作用。

As old oilfields enter the stage of high watercut development,reservoir physical properties(porosity,permeability,and shale content)change with the increase of water injection multiple,which leads changes of reservoir seepage field.In this case,the reminding oil prediction and oil recovery improvement are much more difficult.Therefore,Reservoir Seepage Geophysics(RSG),a novel technology,is proposed.The feasibility of the reservoir seepage geophysics is proved with change analysis of reservoir porosity,shale content,and reminding oil saturation in different development stages.Based on rock physics experiments,multi-disciplinary information such as time-lapse seismic,time-lapse VSP,time-lapse electromagnetic surveys,and different well logging data are jointly used to study the reservoir seepage field.Finally a multi-dimensional reservoir seepage geological geophysical model is built,which shows reservoir seepage variations.The reservoir seepage geophysics is some continuation and improvement of reservoir geophysics,which will play an important role in the reservoir seepage field reconstruction and the oil recovery improvement of old oilfields.