4 sequences and 10 sedimentary system tracts could be identified in the sedimentary strata of the Jurassic in Taibei Sag of the Turpan-Hami Basin. The lowstand system tract

transgressive system tract and highstand system tract developed under the control of ancient structure

paleotopagraphy

paleoclimate

sediment supply

and so on. In this paper

the sequence stratigraphy of the Jurassic in Taibei Sag is studied on the basis of geological

seismic

well logging and geochemical data. It is considered that sedimentary framework of the sag experienced great changes in Jurassic. From south to north

fluvial

swamp and lake deposits developed well in Early Middle Jurassic.Braid river deltaic and lake deposits developed in Middle Jurassic;and braid river

lake and fan deltaic deposits developed in Middle-Late Jurassic.Among them

coal bed of swamp and mudstone of deep-lake are good hydrocarbon soure rocks

braid river delta

fan delta and river channel sand bodies are good reservoirs

and lake mudstone is good cover rock. They constitute vertically favourable source reservoir-cap rock assemblages.