储层宏观物性参数随注水开发动态演化模式研究

Evolutionary pattern of macroscopic petrophysical parameters with waterflooding performance

以冀中油田砂岩储层为例,在储层原始物性参教研究的基础上,通过大量室内岩心样品在不同水驱倍数下的驱替、压汞实验以及不同开发阶段完钻井的测井参数评价,定量分析了4种典型储层流动单元宏观物性参数在油藏注水开发过程中的变化特点,并建立了各项参数相应的数学定量演化模式。研究结果表明,随水驱开发时间的延长,孔隙度、渗透率、含水饱和度均有明显增大的趋势,而泥质含量则呈递减趋势。通过储层物性参数动态演化定量模式研究,可建立储层"四维"动态演化模型,进一步探讨流动单元剩余油分布规律,因此该研究具有重要的理论和实际意义。

Taking the sandstone reservoir in Jizhong oilfield as an example, the changes of macroscopic petrophysical parameters in 4 typical flow units during waterflooding process are analyzed quantitatively on the basis of initial petrophysical parameter study, great amounts of core displacement and mercury injection experiments, and evaluation of logging parameters from wells completed in various development stage. Also established is the quantitative mathematical evolution model corresponding to each parameter. The result of the study shows that, as the continuing of waterflooding, porosity, permeability and water saturation all increase obviously, while the shale content shows a reducing trend. 4D reservoir performance model may be established through quantitative study of the evolution of reservoir petrophysical parameters to further probe into the law of residual oil distribution in flow units. This study is of theoretical and practical significance.