Development characteristics and models of beach-bar depositional system constrained by multistage gentle slope landform in continental lacustrine basin

Hu Hui; Zhu Hongtao; Du Xiaofeng; Liu Qianghu; Liu Ziyu; Sun Zhongheng; Ye Ziqian; Sun Xianfeng

doi:10.12284/hyxb2024055

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Hu Hui，Zhu Hongtao，Du Xiaofeng, et al. Development characteristics and models of beach-bar depositional system constrained by multistage gentle slope landform in continental lacustrine basin[J]. Haiyang Xuebao，2024, 46(12)：1–13 doi: 10.12284/hyxb2024055

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Development characteristics and models of beach-bar depositional system constrained by multistage gentle slope landform in continental lacustrine basin

doi: 10.12284/hyxb2024055

1.
School of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China
2.
CNOOC Research Institute Co., Ltd., Beijing 100028, China

Received Date: 2023-09-12
Rev Recd Date: 2024-04-03

Available Online: 2025-01-13

Abstract

Abstract

Sandy and mixed beach-bar, which has good exploration potential, are widely developed in the upper fourth member of Shahejie Formation(Es4^U) to the lower third member of Shahejie Formation (Es3^L) of the Laizhou Bay Sag in the Bohai Bay Basin. At present, the sedimentary characteristics, genesis mechanism, and evolution mode of the beach-bar are still poorly understood, which seriously restricts the exploration and prediction of this type of sedimentation. Therefore, this study makes comprehensive use of drilling, logging, and seismic data to finely recover the micro-paleogeomorphology of the study area, clarifies the controlling role of geomorphology of the multi-stage gentle slope on the development of the beach-bar in the study area, sums up the depositional characteristics and the main controlling factors of the sand bodies of the beach-bar at different locations, and constructs the depositional model. The results show that: (1) sandy beach-bar are mainly developed in the front flanks of the braided river delta of the Es4^U, which are mainly controlled by the windward geomorphic features of the first-stage gentle slope, strong sediment supply, and paleo-wind direction. (2) The thick-layered mixed beach-bar are mainly developed in the windward zone of the secondary gentle slope of the Es4^U, which is jointly influenced by paleo-morphology, medium sediment supply, and coastal currents. (3) The thin-layered mixed beach-bar are developed in the windward zone of the first-stage gentle slope of the Es3^L, which is influenced by the combination of paleo-morphology, weak sediment supply, paleo-wind direction, and littoral current. By dividing the multi-stage gentle slope geomorphology, the establishment of the depositional model can help to predict the distribution of the sand body of the beach-bar and provide a reference for the exploration of the sand body of the beach-bar in the Bohai Bay Basin.
- multistage gentle slope landform,
- sandy beach-bar,
- mixed beach-bar,
- Laizhou Bay Sag,
- main control factor,
- sedimentary model

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