Hydrodynamic units in a petroliferous sedimentary basin can be categorized as follows: ①compaction-driven centrifugal flow, ②relief-driven centripetal flow, ③ cross-formational flow with/without evaporation and ④lagged flow. In general, the meteoric water infiltrates asymmetrically in the margin of basin and centripetal flow develops. The central depression is an area of centrifugal flow caused by mudstone-compacted water. Centrifugal flow and centripetal flow converge and result in cross-formational flow. The distributions of hydrochemistry field are controlled by the hydrodynamic evolution and the formation mechanism of groundwater in sedimentary basins. The groundwater concentrated in the cross-formational flow area results in relatively higher concentration. Centrifugal flow driven by sediment compaction is the main driving force of the oil-gas migration and accumulation in the sedimentary basins. During the process of centrifugal flow, part of oil and gas are gathered due to the lithology, stratum, fault and so on. The cross-formational flow area is favorable to abundant oil and gas enrichment. During the process of centripetal flow, the oil and gas accumulated previously may be destroyed partly, maybe form dynamic trap or lithologic trap, stratigraphic trap and fault trap under certain geological conditions.