济阳坳陷深层发育的三角洲相、扇三角洲相及冲积扇相砂岩 ,是以填隙物微孔隙和粒间孔为主的低孔低渗、中孔低渗型储层。从总体上讲 ,压实作用使粒间孔隙随深度的增加而减少 ,但三角洲相砂岩抗压实作用强 ,利于粒间孔隙的保存 ;石英次生加大、绿泥石和高岭石的充填、铁方解石和铁白云石等的胶结使粒间孔隙减少 ,溶解作用可以随深度的增加产生大量有机酸 ,在喷出岩屑中形成大量的岩屑溶蚀孔 ,利于深部储层次生孔隙的形成。次生孔隙和微孔隙成为深部储层的主要储集空间类型。晚成岩A亚期有机酸大量排出 ,形成长石和岩屑等溶蚀孔 ,使溶蚀孔、粒间孔和微孔隙并存 ;B亚期有机酸与CH4、CO2 并存 ,绿泥石占据了孔隙 ,阻止了碳酸盐的沉淀 ,使微孔隙和溶蚀孔得以保存 ;C亚期有机酸减少 ,CH4、CO2 增加 ,利于构造、成岩裂缝形成 ,保存大量微孔隙 ,改善了储集性能 The delta, fan delta facies and alluvial fan facies sandstone developed deep in the Jiyang Depression are low-porosity, low-permeability, medium-porosity and low-permeability reservoirs dominated by interstitial micropores and intergranular pores. Generally speaking, the compaction reduces the intergranular porosity with the increase of depth, but the delta sandstone is strong in compaction and solidification, which is conducive to the preservation of intergranular pores. The quartz secondary growth, chlorite and kaolinite filling , Iron calcite and iron dolomite and other cements to reduce the intergranular porosity, the dissolution can increase with the depth of a large number of organic acids, the formation of a large number of expelled cuttings lithic dissolution wells, deep reservoir secondary porosity conducive form. Secondary porosity and microporosity become the main type of reservoir space for deep reservoirs. In the late diagenetic stage, A-phase organic acids are expelled in a large amount to form dissolution pores such as feldspar and cuttings, which co-exist with dissolved pores, intergranular pores and micropores. B-phase organic acids co-exist with CH4 and CO2 and chlorites occupy pores, The precipitation of carbonate makes the microporosity and dissolution hole to be preserved. The decrease of organic acids in C sub-period, the increase of CH4 and CO2, which will help the formation of diagenetic cracks and the formation of large number of micropores and improve the reservoir performance