根据砂岩薄片、铸体薄片、扫描电镜、X-衍射等分析,对子长油田安定区块长6储层砂体的岩石学特征、成岩作用进行了研究。结果表明:研究区长6储层储集砂体成分主要由长石质岩屑砂岩和岩屑质长石砂岩组成,砂岩具成分成熟度较低、分选性较好、磨圆度较差的特点,其成岩作用处于晚成岩A期。早期的压实作用及胶结作用是使原生孔隙遭受破坏的主要因素,而溶蚀作用是形成次生孔隙的主要因素。 The petrological characteristics and diagenesis of Chang 6 reservoir sandstone in the Anding block of Zichang oilfield were studied based on the analysis of sandstone flake, cast slab, scanning electron microscope and X-ray diffraction. The results show that the composition of reservoir sand body in Chang 6 reservoir is mainly composed of feldspathic lithic sandstone and lithic feldspathic sandstone. The sandstone has lower maturity, better separation and poor roundness Its diagenesis is in late diagenetic stage A. Early compaction and cementation are the main factors that lead to the destruction of primary pores, while dissolution is the main factor of forming secondary pores.