Abstract: Based on ordinary thin sections and pore casting thin section observation, scanning electron microscopy, cathodoluminescence and X-ray diffraction analysis as well as mercury intrusion experiments, this thesis analysis the petrological characteristics, diagenesis, physical properties, pore types and pore evolution of the tight sandstone reservoirs of the Xujiahe Formation in the northeastern Sichuan Basin, furthermore studies the control effect of multi-stage tectonic movement on sandstones with different provenances. The results show that in the late Indosinian period, the difference in provenance supply and the type of parent rock of source area caused by the strength of the basin-forming orogenic activities in the study area resulted in different types of sandstone, which were described before, including the lithic sandstone of the Xu-2 tight sandstones, the calcarenaceous sandstone of the Xu-3 tight sandstones, the feldspathic lithic sandstone of the Xu-4 tight sandstones, and the quartz sandstone with lithic sandstone of the Xujiahe Formation in three area (western Yuanba Area, Bazhong Area, Malubei Area), respectively. Under the continuous influence of Yanshan Movement and Xishan Movement, Malubei strong deformation zone, Bazhong medium deformation zone and western Yuanba weak deformation zone are developed from near to far from the Daba Mountain foreland compressive zone. Different types of sandstones in different tectonic locations have experienced different diagenetic sequences and porosity evolution processes. The tectonic action controls the structural extrusion strength, and crack and fault development degree and scale, which further determines the preservation of the original pores and the later dissolution pores and the connectivity of the pores. It also controls the source-storage relationship and the degree of oil and gas charging, and ultimately controls natural gas yield.

Key words: tectonic movement, provenances, gas yield, tight sandstones, Xujiahe Formation