The evolution history of multicycle in Tarim Basin is determined by long distance drifted small plates,complicated basement and complex tectomic activities of the neighbouring plates.The basin underwent four evolution stages such as Paleoasian Ocean,Paleotithys Ocean,Mesotithys Ocean and Neotethys Ocean,which resulted in a milti-prototype basins,the superimposition in which the basin united as a whole at first,then disintegrated later and reunited again at last with variable thermal regime.The multicyclic evolution of the basin resulted in multiple petroleum system,multi set of souce rocks,multiple oil generating depression,multi-stage of oil generation,multi-type of reservoiring spaces,multi-type of sealing and covering system,complex passage networks and multi-type of trap system.The reformation,resealing and preservationg of post formation of oil and gas led to complicated hydrocarbon pool-forming history in multiple hydrocarbon accumulation belts.On this basis,oil and gas exploration in Tarim Basin from now on should aim at the discovered oil and gas fields,increase reserves and expand exploration realm.
