Effect of pore networks on the properties of movable fluids in tight sandstones from the perspective of multi-techniques

Knowledge about movable fluid behavior's underlying mechanisms is crucial to hydrocarbon development in tight sandstones. In this study, multi-techniques were used to determine mineralogy, pore structures, and movable fluid properties. Whether the connectivity of pore networks optimizes, deteriorates, or has no influence on the fluid flowability has been disputed. During the research, both abundant illite and little chlorite contribute to improved flowability since a large pore-throat radius corresponds to enough accommodation space. Also, the pore-throat connectivity and apparent contact angle fluctuate because of the change of pore size range. The movable fluid properties are primarily dependent on the degree of throat development, while the well-connected pore networks, especially enough void space, correspond to good reservoir quality. In this study, the micro-mechanism of pore size distribution was disclosed by multi-techniques, and the governing factors of reservoir qualities for tight sandstones were defined.