| 河流辫-曲转换特点与废弃河道模式 |
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| 引用本文： | 李胜利,于兴河,姜涛,梁星如,苏东旭.河流辫-曲转换特点与废弃河道模式[J].沉积学报,2017,35(1):1-9. |
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| 作者姓名： | 李胜利 于兴河 姜涛 梁星如 苏东旭 |
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| 作者单位： | 1.中国地质大学(北京)能源学院, 北京 100083; |
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| 基金项目： | 国家自然科学基金项目，中石油华北油田重大科技专项(HBYT-YJY-2015-JS)[National Natural Science Foundation of China |
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| 摘 要： | 通过总结河流变迁规律，明确了辫-曲转换特征，建立了辫-曲过渡型河流的沉积序列；通过分析弯曲度与废弃河道沉积特征的相互关系，提出不同类型河流中存在分叉分流、串沟取直及颈项截直三类废弃河道，并提出三类废弃河道的分类依据，进而建立了相应的沉积模式。通过解剖北京西山军庄二叠系河流相野外露头，分析了辫状河、以曲流河及其过渡型河流的沉积特征与演变特点，识别出该露头中发育的废弃河道，进而明确该露头中产生辫-曲转换的地质因素是不同气候条件下，由于沉积供源的差异导致河道类型的变化。
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| 关 键 词： | 河流辫-曲转换 沉积序列 废弃河道 二叠系河流相 |
| 收稿时间： | 2015-11-16 |
Meander-braided Transition Features and Abandoned Channel Patterns in Fluvial Environment |
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| LI ShengLi,YU XingHe,JIANG Tao,LIANG XingRu,SU DongXu.Meander-braided Transition Features and Abandoned Channel Patterns in Fluvial Environment[J].Acta Sedimentologica Sinica,2017,35(1):1-9. |
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| Authors: | LI ShengLi YU XingHe JIANG Tao LIANG XingRu SU DongXu |
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| Institution: | 1.School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;2.Research Institute of Exploration and Development, Xinjiang Oilfield, PetroChina, Karamay, Xinjiang 830013, China;3.Huabei Oilfield Company, PetroChina, Renqiu, Hebei 062552, China |
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| Abstract: | Based on summing up the great variability and dynamic behavior of rivers, we analyzed the meander-braided transition characteristics and constructed its sedimentary sequence. According to the relationship between sinuosity and abandoned channels, we divided abandoned channels into three patterns which are avulsion, chute cutoff- and neck cutoff- abandoned channel, respectively, and each pattern has its particular sedimentary sequence model. Furthermore, by analyzing the sedimentary characteristics from a Permian fluvial outcrop located in Beijing western suburbs, we clarified the evolution of braided, meander-braided transition and meandering channels and distinguished three abandoned channels. We reached the conclusion that the main factor leading to meander-braided transition in the study area is the change of sediment supply caused by different climate conditions. |
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| Keywords: | meander-braided transition of river sedimentary sequence abandoned channel fluvial environment in Permian |
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