江陵凹陷新沟嘴组下段储层是一套湖泊三角洲—浅湖滩坝砂体.砂体类型有三角洲平原分流河道砂体、三解洲前缘水下分流河道砂体及三角洲前缘水下分流河口砂坝等.岩石类型为成分成熟度较低的岩屑长石砂岩和长石砂岩,并合较多的粘土矿物和硬石膏、方解石、白云石胶结物.压实和胶结是使原生孔隙降低的主要成岩作用,而发生在油气大量生成期的溶解作用则使较多的次生孔隙形成.储层物性受岩石结构如粒径、分选等控制,也受胶结物含量及溶解作用等控制. The lower part of Xingouzui Formation in Jiangling Depression is a set of lacustrine delta-shallow lagoon dam body sand bodies, including delta plain distributary channel sand body, the frontier of Sanqizhou Island sub-distributary channel sand body and the delta front Distributary estuary sand bar, etc. The rock types are lithic feldspar sandstone and feldspar sandstone with lower maturity of composition, more clay minerals and anhydrite, calcite and dolomite cement with compaction.Compaction and cementing make the primary The main diagenesis which reduces the porosity and the dissolution which occurs in the massive formation period of oil and gas make more secondary pores form.The physical properties of the reservoir are controlled by the rock structure such as particle size and sorting and are also affected by the content of cement and dissolution Other control.