High-resolution Sequence Stratigraphic Characteristic and Lithological Reservoir Prediction of section, of Qingshuihe Formation in the Central of Junggar Basin

Based on the principal of base-level cycle, one long-term stratigraphic cycle, two intermediate-term stra-tigraphic cycles and five short-term stratigraphic cycles can be identified in Mem. 1 of Qingshuihe Formation (K1q1) through the drilling data, cores and well-log data. In the MSC1 of intermediate-term stratigraphic cycle, the main deposition is braided-river delta. In the MSC2 of intermediate-term stratigraphic cycle, the main deposition is of lacustrine facies , with some deposition of braided-river delta in the local area. This kind of configuration makes it very comfortable for the development of lithological reservoirs. The regional interlayer develops in the top of unsymmetrical long-term stratigraphic cycle. The favorable reservoir is mainly formed during the early period when the intermediate-term base-level ascended.