Analysis of the Influence of Micro-Pore Structure on Oil Occurrence Using Nano-CT Scanning and Nuclear Magnetic Resonance Technology: An Example from Chang 8 Tight Sandstone Reservoir, Jiyuan, Ordos Basin

The micro-pore structure of a tight sandstone reservoir remarkably impacts the occurrence characteristics oil. Jiyuan Chang 8 in Ordos Basin was examined this research using core physical property test, an environmental scanning electron microscope, thin section identification, and high-pressure mercury intrusion. Using nano-CT nuclear magnetic resonance technologies, representative samples were chosen for studies evaluating oil statically dynamically. effect on investigated, forming process discussed. It significant to study Basin. Findings indicated that Jiyuan, has poor properties exhibits high degree heterogeneity. In addition, charging simulation experiment (oil charging) can be separated into following three stages: fast growth, gradual stability. crude charging, always preferentially entered medium pores large pores. These primary areas distribution. Furthermore, affected by pore type, parameters, throat combination mode throat. First, substantially lead effective connectivity generate considerable amount morphology includes film, cluster, porous, isolated. Second, greater intergranular growth soluble feldspar development, thicker throat, more developed quantity Finally, saturation negatively correlated with median pressure displacement positively sorting factors, radius, maximum efficiency inverted mercury.