Abstract: Study of the Jurassic in Taibei sag of Turpan-Hami basin was conducted with seqene stratigraphic analysis. Theod according to the characteristics of depositional evolution, resulting in the division into three types of sequence stratigraphy models (Takequan uplift, south low-angle slope and northeast high-angle shooe) and uree types of corres-winding models for formation of Reservoirs. The characteristics of diagenic evolution of the Jurassic in Tabei sag was discussed upon the diagenics process and early diagenic phase of mechanical compction and partial cementation, late (A1) diegenic phase of dissolution and late (A2 and B) diagenic phases of recementation were vertically divided. It is concluded that secondary porosity and fractures resulting from dissolution, tectonic movement and compaction proved reservoir quality the western and central parts of Taibei sag should be the key area for petroleum explaration and secondary porosity dominated zones at moderate to deep burials can be considered as the target for diagenic reservior trap exploration.

Key words: Turpan-Hami basin, Taibei sag, Jurassic, Depositional evolution, Sequence stratigraphy, System tract and sedimentary system, Reservoir diagenesis, Oil and gas accumulation zone