Sedimentary characteristics and controlling factors of lacustrine storm deposits of the Paleogene Shahejie Formation in Lijin sag，Dongying Depression，Bohai Bay Basin
Wei Xiaojie1, Jiang Zaixing1, Li Yifan1, Zhang Yuanfu1, Zhao Boyu2, Wang Junhui1
1 School of Energy，China University of Geosciences(Beijing)，Beijing 100083;
2 Research Center，Sinochem Petroleum Exploration and Production Co.，Ltd.，Beijing 100031
Based on cores observation，abundant and diverse sedimentary structures were found in the upper part of Member 4 of Paleogene Shahejie Formation(E s 4) in Lijin sag，Dongying Depression，Bohai Bay Basin. The main sedimentary structures of storm deposits identified included storm-erosional structures(scour surfaces，gutter casts and truncated structures)，storm-eddy structures(tear structures)，storm-gravity structures(graded bedding and blocky bedding)，storm-wave structures(hummocky cross-bedding，parallel bedding and wave ripples)，and penecontemporaneous deformation structures formed in the storm energy attenuated stage. An ideal vertical sedimentary sequence of storm deposits was constructed in the study area. It consisted ten lithofacies units, corresponding to three storm energy stages: Storm eddy stage，storm wave stage and storm energy attenuated stage. Storm deposits in the study area mainly developed between the fair-weather wave base and storm wave base，except type Ⅰ(in-situ erosion storm deposits)developed above the fair-weather wave base. According to comprehensive analysis，it was acknowledged that the storm energy，provenance，palaeotopography as well as lake level change were controlling factors of storm deposits，and the favorable developing conditions for these four types of storm deposits were analyzed.
Wei Xiaojie,Jiang Zaixing,Li Yifan et al. Sedimentary characteristics and controlling factors of lacustrine storm deposits of the Paleogene Shahejie Formation in Lijin sag，Dongying Depression，Bohai Bay Basin[J]. JOPC, 2014, 16(3): 377-384.
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