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泌阳凹陷主要含油目的层下第三系核三段发育有三种不同类型的三角洲沉积砂体：①扇三角洲；②近源三角洲；③正常三角洲。受古构造、古水系、物源等地质条件的控制，不同类型的三角洲分布在凹陷的不同部位，且其沉积特征和储集性能均具明显差异。本文从骨架相构成、层理类型、垂向层系、内部相带发育状况等方面阐述了三种类型三角洲的沉积特征，进而对三种类型三角洲砂岩储层的储集性能作了论述。
There are three different types of delta sedimentary sand bodies developed in the third member of the Third Paleogene beneath the main oil-bearing layer in the Biyang depression: ① fan delta; ② near-source delta; ③ normal delta. Under the control of palaeotectonics, paleo-water systems and provenance, different types of delta are distributed in different parts of the depression, and their sedimentary characteristics and reservoir performance are obviously different. In this paper, the sedimentary characteristics of three types of delta are described in terms of skeleton facies, bedding types, vertical strata, and internal facies development, and then the reservoir performance of three types of deltaic sandstone reservoirs are discussed.