Abstract: This paper presents the classification and correlation of the Xujiahe formation of Upper Triassic in Baojie by means of highresolution stratigraphy using overwhelming drilled cores, well logs and other analytical data, integrated with the observation and description in surrounding field outcrops, and develops the sequence stratigraphic framework of 2nd member of Xujiahe formation, including in-depth studies of characteristics of its sedimentary facies, structure, reservoir, diagenesis, source rock and cap rock. The parameters such as the sedimentary facies, reservoir porosity, permeability, net pay thickness and reservoir type can be used for prediction of the zones through effective overlay technique. It is concluded that there exist five gas-bearing zones in this area, of which high capacity zones are distributed in the sedimentary microfacies of underwater distributary channel with large structural deformation, rough sediment grain-size and good porosity and permeability, and the reservoir types are dominated by Type I and Type II.

Key words: Baijie area, sequence stratigraphic framework, sedimentary facies, structural feature, reservoir quality, source rock, favorable gas-bearing zone