Abstract: Based on the characteristics of high-frequency sedi- mentary cycles of high accuracy sequence stratigraphy,un- dercompaction in mudstone,characters of organic geochem- istry,and combined with confining conditions and differences between formations in the salt-lake basin,the Paleogene and Quaternary formations are classified into five kinds of reservoir-forming dynamics systems from new to old:the top part else-sourced normal pressure open dynamic sys- tem,the upper part mixed-sourced normal pressure open dynamic system,the middle part mixed-sourced poor over- pressure semi-closed dynamic system,the lower part self- sourced overpressure semi-closed dynamic system,and the bottom part self-sourced poor overpressure closed dynamic system.Of these dynamics systems,the lower and the mid- dle part dynamic systems are the most significant hydrocar- bon exploration systems.It is more important to search for subtle reservoirs and speed up the hydrocarbon exploration proceeding in Dongpu sag.