Abstract：Large marine deltas are widely distributed and their sedimentary dynamics are complex. Their fine stratigraphic-sedimentary architecture and evolution are the focus of research in the field of sedimentology for a long term. By integrating core,logging and 3D seismic data,this paper combines the analysis methods of high-resolution seismic sequence stratigraphy and seismic sedimentology to make a comprehensive investigation of the sedimentary characteristics of the early-middle Miocene in the Enping area on the west side of the paleo Pearl River Delta. The main microfacies units of river-controlled deltas such as braided channels and meandering channels are identified,and the typical microfacies developed in wave-controlled deltas such as coastal sand ridge are also revealed. Under the constraint of high-frequency sequence framework,the evolution characteristics of the paleo Pearl River Delta in an individual typical sequence system are revealed: the lowstand systems tracts are dominated by river-controlled delta,with the occurrence of large intersecting braided channels;while within the transgressive and highstand systems tracts,channels are significantly smaller in scales,dominated by small-scale meandering channels,and have typical characteristics of wave movement such as coastal sand ridges. In addition,according to the systematic mapping and evolution analysis of the early Miocene sedimentary facies belt in the Enping area,six large river diversion phenomena were identified within ca. 6 Ma. It is speculated that the sedimentary evolution in the Enping area is obviously affected by the autogenic process.
Li Zhi-Gao,Ding Lin,Li Xiao-Ping et al. Sedimentary characteristics and controlling factors of the western Zhu Ⅰ depression during the early-middle Miocene, Pearl River Mouth Basin[J]. JOPC, 2022, 24(1): 99-111.
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