Research on major unconformities and large-scale palaeo-uplifts developed during the key transformation stages in sedimentary basins is key to revealing the basin dynamics evolution and hydrocarbon accumulation.Based on the integrated analysis of seismic

logging and outcrop data

we demonstrated the characteristics of the Mesozoic major unconformities and palaeo-geomorphology

as well as how they are influenced by the dynamics evolution of Kuqa-Tabei basins through tracking unconformity truncation and onlap points

etc.Results show that the study area in the Mesozoic undergone four key transformation stages

namely the Late Permian

Late Triassic

Late Jurassic

Late Cretaceous stages; in turn four regional angular unconformities

namely TT

TJ

TK and TE

which have brought significant impact on the basinal tectonic palaeo-geomorphology.The transformation occurring at the Late Permian was mainly characterized by the development of large-scale palaeo-uplift belts in the central and western parts of the study area

and the unconformity TT was mainly distributed around the palaeo-uplifts with the maximum denudation thickness of 1 200 m.The tectonic movement of the Late Triassic resulted in a significant reactivation of the palaeo-uplift belts in the study area

and the unconformity TJ produced is of wide range with the maximum denudation amounting to 400 m.The tectonic movement taking place in the Late Jurassic resulted in another stage of uplifting and denudation in the central and western of the study area

and consequently the unconformity TK was developed with the maximum denudation of 500 m.The transformation of the Late Cretaceous is mainly characterized by the development of the Wensu palaeo-uplift at the western margin of the study area

and its associated unconformity TE is of limited distribution with the maximum denudation amounting to 300 m.Three geomorphologic units are recognized in the Mesozoic palaeo-highs

that is the uplift high

slope and depression areas.Around the slope area formed unconformity triangle zones

which are favorable for the development of litho-stratigraphic traps.In addition

it's believed that the four collisional orogeneses occurring around the basins had driven the formation of four transformation stages in the Mesozoic.