吐鲁番坳陷北部七克台组发育扇三角洲沉积。扇三角洲前缘水下分流河道形成的碎屑岩体是扇三角洲沉积的主体部分，成为主要的油气储集体。储集层碎屑岩的岩石类型为岩屑砂岩和岩屑砂砾岩，其主要组分为凝灰岩和喷出岩岩屑。储集层在成岩过程中的主要成岩变化为机械压实作用、水化水解作用和胶结作用。碎屑岩在成岩作用改造下成为低孔低渗的致密型储集层。 The fan delta sediments developed in the Qiketai Formation in the northern part of the Turpan Depression. The clastic rocks formed by sub-distributary channel in fan delta front are the main part of fan delta deposition and become the main oil and gas reservoir. The rock types of reservoir clastic rocks are lithic sandstone and rock debris conglomerate, whose main components are tuff and expelled rock debris. The main diagenetic changes during reservoir diagenesis are mechanical compaction, hydration and cementation. Clastic rocks became diagenetic low-porosity and tight reservoirs under the transformation of diagenesis.