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High Resolution Sequence Stratigraphy Correlation and Sedimentary Model of Turbidites


Based on high resolution sequence stratigraphy and sedimentology, with the analysis of cores, logging and seismic data, high resolution sequence stratigraphy, sedimentary characteristics and distribution laws of turbidites developed in the 1st member of Qingshankou formation in Dabusu area of west slope, south Songliao basin, were analyzed. According to turbidites formation, multi-grade collapses were identified and 3 types of deposits were developed, including slump (close to source or break slope), turbidite channel (nearby or distant from source), and turbidite sand sheet (far away from source); Slumps mostly located in falling periods of base level cycle (BLC), close to sequence boundary (SB), large thickness, superimposed or interlaid with turbidite channels vertically, and usually thicker upwards. Turbidite channels developed in both rising and falling periods of BLC. They were usually thick, near SB, showing “boxing” shape logs as trunks of turbidites in rising periods of BLC, and thinner upwards. However, they were usually thin, near flooding surfaces, showing “finger” shape logs as flanks of turbidites in falling periods of BLC, and thicker upwards. Turbidite sand sheets mainly distributed in relatively deeper water and near maximum flooding surfaces, having thin thickness, superimposed with lacustrine marine shale or turbidite channel flanks vertically. Considering turbidite formation (i.e. distant gentle slope, distant steep slope or nearby steep slope), source type (i.e. point, multi-points or linear source) and grain size (i.e. gravel rich, sand rich or shale rich), 27 kinds of turbidites were identified. Furthermore, turbidites developed in the study area belong to distant gentle slope, multi-points source and shale-sand rich type.