Dynamic analysis and accumulation process recovery of typical reservoirs in Zhenjing region, south of Ordos Basin

The dynamic analyses of typical reservoirs in Zhenjing region of the southern Ordos Basin have been carried out based on pore evolution history recovery,petroleum generation history thermal simulation and fluid inclusion analyses.The Chang8 lithologic traps were formed since the late Jurassic (160 Ma).The Chang7 source rocks began to generate petroleum at the end of Jurassic (140 Ma) and achieved the peak at the end of early Cretaceous (100 Ma).The Chang8 reservoirs were formed during 2 stages,including the medium of early Cretaceous (130 Ma) and the beginning of late Cretaceous (90 Ma).The times for trap formation,petroleum generation and reservoir formation matched well,which was favorable for the formation of Chang8 reservoirs.The charging and accumulation processes of petroleum were recovered according to the studies of tectonic evolution.A dynamic evolution model illustrating the process of reservoir formation was made,characterized by "multiple stages of accumulation,mainly formed during the middle stage and late stage adjustment".