Study on high-resolution sequence stratigraphy of T_2k_2 of Zhongguai area in Junggar Basin

High-resolution sequence stratigraphy is studied for upper Karamay formation (T2k2) in Zhongguai area of Junggar Basin by integrated application of drilling, logging and seismic data. Totally 12 short-term base level cycles are recognized according to microfacies sequence stacking pattern and interface characteristics; and 3 medium-term and 1 long-term base level cycles are recognized based on the recognition of short-term base level cycles. The characteristics of each base level cycle are analyzed in detail. Cross-well correlation has been conducted for the medium-term base level cycles in the study area to build an isochronous stratigraphic correlation framework for conducting sands correlation and improving correlation accuracy. It is concluded that there exists a close relationship between sand development and base level cycle within the stratigraphic framework.