多期次构造运动对不同物源成分砂岩控制作用

通过普通岩石薄片和孔隙铸体薄片观察、扫描电镜、阴极发光和X衍射分析及压汞实验等手段，对川东北地区须家河组致密砂岩储层的岩石学特征、成岩作用、物性特征及孔隙类型和孔隙演化等方面进行分析，进而研究多期次构造运动对不同物源成分砂岩的控制作用。结果表明，印支晚期，研究区盆缘造山活动的强弱控制了须家河组物源供给和物源区母岩类型的差异，形成了不同类型的砂岩，包括元坝西须二段岩屑砂岩、元坝西须三段钙屑砂岩、巴中须四段长石岩屑砂岩、马路背须家河组石英砂岩和岩屑砂岩。在燕山运动和喜马拉雅运动的持续影响下，从大巴山前陆挤压带向盆地内由近及远依次发育马路背强变形区、巴中中等变形区和元坝西弱变形区，不同构造部位不同类型砂岩经历了不同的成岩序列和孔隙演化过程。构造部位控制了构造挤压强弱与裂缝及断层发育程度及规模，进而决定了原始孔隙与后期溶蚀孔隙保存程度以及孔隙的连通性，也控制了源储关系与油气充注程度，最终控制天然气产能。

Controls of Multi-stage Tectonic Movement on Sandstones with Different Provenances

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.