Facies of the Jurassic Qigu Formation and Distribution of Reservoir in the Chepaizi Uplift, Junggar Basin：A case study on Qigu Formation stratigraphic lithologic reservoirs in Well Che 60 Block

Key words: 
• Chepaizi Uplift /
• Qigu Formation /
• sedimentary microfacies /
• reservoir

Abstract: Qigu Formation of Jurassic was significant oilbearing strata in Junggar basin, its sequence had developed completely, and the sedimentary facies type was very rich. Comprehensive utilization of core, logging, mud logging and related testing information；In addition，based on the analysis of the sedimentary characteristics, sedimentary microfacies of Qigu Formation in Well blockChe60 have been systematically studied. The results showed that the provenance source of Qigu Formation source came from the northwest and north direction mainly. Target layer was the braided river delta, the sand body of Channel bar was the framework for the reservoir, whose reservoir property was the best; followed channel mouth bar, underwater distributary channel was the most favorable sedimentary facies of Oil and gas migration and accumulation. Results of its research had provided reliable geological basis for development plan and dynamic ananlysis of the oil field.