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针对鄂尔多斯盆地致密油储层特点,利用世界领先的微米-纳米级CT扫描、场发射扫描电镜和恒速压汞等技术,对储层孔隙喉道、孔喉配置关系和填隙物等微观结构进行系统研究。研究结果表明,孔隙大小决定致密油储层的储集能力,储层孔隙平均半径约为0.5~10μm;喉道大小是开发下限主要制约因素,喉道半径主要分布在0.3~0.9μm;渗透率低的储层孔喉比大,喉道制约孔隙中流体的移动,控制储层输导能力。孔隙中填隙物含量高且以伊利石为主,伊利石粒度小、可塑性强,水化膨胀后易发生运移堵塞孔道,使储层渗透性降低,降低孔隙的输导能力。
According to the characteristics of tight oil reservoirs in the Ordos Basin, the microscopic structures of pore throats, pore-throats and interstitial structures in reservoirs are exploited by the world’s leading micrometer-nanometer CT scanning, field emission scanning electron microscopy and constant velocity mercury injection. Conduct systematic research. The results show that the size of pores determines the reservoir capacity of tight oil reservoirs, and the mean pore radius of reservoirs is about 0.5 ~ 10μm. The throat size is the main limiting factor for the lower limit of development and the throat radius is mainly distributed in 0.3 ~ 0.9μm. The permeability The low reservoir throat-to-wall ratio is large, the throat restricts the fluid movement in the pores and controls the reservoir conductivity. High content of interstitial interstitial material and mainly illite, illite small particle size, strong plasticity, hydration expansion prone to migration and blockage of the channel, the reservoir permeability decreased, reducing the ability of pore conductivity.