Abstract: The identification mark for pre-Jurassic reference plane cycle of Tu-ha basin is developed with coring,drilling, well logging and seismic data in light of high-resolution sequence stratigraphy, dividing the Middle Permian-Triassic into four reference plane cyclic sequences, by which the distribution of sedimentary system within isochronal formation skeleton is studied. The result shows that tectonic action is the principal factor for controlling shape of the reference plane cycles in this area, and in the Middle Permian-Triassic, there exist three sedimentary segs such as simple foreland, double foreland and gibbous foreland, two sedimentary models of gentle slope and steep slope as well as source-reservoir-cap rocks developed extensively. The source rocks are mainly formed in early period of the reference plane descending, the assemblages of normal reservoir-cap rocks shaped in the period of the reference plane ascending are of great potentials for petroleum prospecting.

Key words: Turpan-Hiami basin, sedlimentation, datum correction, structure, sequence, foreland basin, sedimentary model