Qiangtang basin is the largest and most prospective petroliferous basin in Qianghai-Tibet plateau.Its surface fold buildings mostly occur in zonal distribution within the Jurassic structural layer

and are dominated by EW-NWW trending upright horizontal folds in pseudo-ejective assemblages.The deformation mechanisms of folds were controlled by compression

strike-slip

and basal structures.Nevertheless

the orogeny along the NS-trending suture zone was the dominant dynamics factors that controlled the geometry

styles and spatial distribution of the folds in the basin.The large folds in the Jurassic structural layer were formed during the Late Jurassic-Early Cretaceous and their temporal and spatial relationships with the generation

migration and accumulation of hydrocarbons from the major source rocks were favorable for hydrocarbon pooling.Therefore

they are favorable trap structures.