水驱高含盐储层渗透率变化机理实验研究

为了研究高含盐油藏水驱渗透率变化机理，在岩心薄片微观孔隙模型实验的基础上，研究了高含盐油藏水驱储层渗透率在不同驱替速率、含盐量、岩心渗透率、注入水性质、驱替孔隙体积倍数等条件下的变化，并且对驱替过程中孔隙变化的微观图像进行了对比。实验结果表明，水驱后渗透率的变化趋势随着岩心渗透率和含盐量以及驱替条件的不同而不同，驱替过程中发生了微粒运移的现象。分析表明，盐的溶解是该类储层渗透率变化的根本原因；以胶结物形式存在的可溶性盐的溶解造成了岩石颗粒的脱落和运移，直接影响储层渗透率的变化。

Change mechanism of permeability in high - saliferous reservoir by waterflooding

In order to study the change mechanism of permeability in high - saliferous oil reservoir by waterflooding, the change of it is studied under different displacement rate ,salinity, core permeability, injected water quality,multiple of displacement volume on the basis of experiments in microscopic pore model of core slice. Microscopic images of describing pore change are compared during the displacement process. The result shows that the changing trend of permeability is different with the various core permeability, salinity and displacement conditions after water drive. Particulates migrated during the displacement process. The dissolution of salt is the essential factors resulting in the change of reservoir permeability. The dissolution of dissoluble salt, existing as cementing matter, leads to the dropout and migration of rock particulates, which is the direct reason of the change of reservoir permeability.