![]() The subsurface deposits of meandering rivers provide important reservoir space for hydrocarbons, which has always been the focus of scholars’ research ( Ghinassi, 2011 Colombera et al., 2017 Sun et al., 2018). The quantitative characteristics of point bar debris and the determined location of SBM and SIA sand bodies provide limited and valuable data support for the formation and simulation of underground meandering rivers, which are also useful for the model of the target reservoir. The width of the point bar segments in the meander belt of the three main sub-layers is mostly 300–400 m, and the maximum width of the point bar segments is about 550 m, while the scale of point bars in Ng45 sub-layer meander belt is relatively small. At the same time, when the width of the meander belt is greater than 1000 m, three or more than three point bars (or point bar connecting body) can be basically identified in the meander belt. In the Ng33, Ng42, and Ng45 sub-layers of the study area, the corresponding meander-belt widths where the point bar (or point bar connecting body) cannot be effectively identified by well logging and seismic data, are, respectively, 800, 800, and 500 m. According to these characteristics, the point bars in the meandering zone can be explained. The forward model based on the shape of point bar reveals the seismic architecture characteristics formed by the superposition of sand bodies at different positions of point bars. With the increase of width of the meander-river belt, the minimum thickness of the drilled meander-river belt decreases as a whole. But it has obvious negative correlation differences in the minimum thickness of meander–river belt. The width of meander-river belt has no correlation with the maximum thickness of meander-river belt. Six meandering belts were defined in the target layer, and the sediment at the bottom is characterized by the transformation from “braided” river to “meandering” river. Seismic lithology is performed using -90° phase wavelet and frequency fusions seismic geomorphology is conducted on seismic stratal slices. Taking meander-river reservoir of Guantao Formation in Chengdao Oilfield as an example, characteristics of the evolution of subsurface meander-belt deposits were studied by seismic sedimentology. Reservoir architecture is an important basis for studying the sedimentary evolution of underground reservoirs and the distribution of remaining oil. 4Shandong Institute of Petroleum and Chemical Technology, Dongying, China.3Marine Oil Production Company, Shengli Oilfield Co.2Key Laboratory of Deep Oil and Gas, China University of Petroleum, Qingdao, China.1School of Earth Science and Technology, China University of Petroleum (East China), Qingdao, China.Bin Yang 1,2,3* Liqiang Zhang 1,2 Zhifeng Sun 1,4 † Yiming Yan 1,2
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