下扬子中部相对稳定区,变形较弱,烃源岩、盖层保存条件较好,油气藏受后期改造相对较弱,具良好的油气勘探前景。利用取芯、测井资料,结合铸体薄片、普通薄片及扫描电镜等分析测试资料,对砂岩特征及孔隙特征、储集空间类型进行了分析。结果表明:龙潭组碎屑岩的主要有溶蚀、压溶、交代、胶结及压实等多种成岩作用类型;成岩阶段主要处于中成岩B阶段早期,储集空间以次生孔隙中的粒间孔、粒内溶孔及铸模孔为主,可见少量的成岩缝及构造缝。 In the lower Yangtze central part of the relatively stable area, the deformation is weak, and the source rocks and cap rocks are well preserved. The latter is relatively weakly reformed and has a good oil and gas exploration prospect. Sandstone characteristics, pore characteristics and reservoir space types were analyzed by coring and logging data combined with the analysis and test data of cast thin films, ordinary thin films and scanning electron microscopy. The results show that the main types of clastic rocks in Longtan Formation are diagenesis types such as dissolution, pressure dissolving, metasomatism, cementation and compaction. The diagenesis stage is mainly in the early B stage of diagenetic rocks. The reservoir space is dominated by intergranular Hole, intragranular dissolution hole and mold hole, showing a small amount of diagenetic and structural joints.