Abstract: This paper starts with the structural movement, geological features, sedimentary filling models during Neogene and their correlation with the structural geological features during Paleogene, dividing and naming the structural units during Neogene for the first time. All the units are divided into four zones, i.e., the overlapped zone with trough margin, the shallow sag zone, the gentle slope zone, and the drape structural zone. The structural styles of all structural zones are concluded. The significances of petroleum geology of the division are illustrated from the perspectives of the relationship between neotectonic movement and late reservoir formation and the guidance for oil and gas exploration in different structural zones.

Key words: Jiyang Depression, Neogene, division of structural zone, neotectonic movement