砾质辫状河型冲积扇沉积微相及沉积模式:以准噶尔盆地西北缘现代白杨河冲积扇为例<sup>*</sup>

doi:10.7605/gdlxb.2018.03.032

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Abstract Alluvial fan coarse-grained reservoirs are characterized by fast facies change and poor continuity,which shows the complexity of the depositional environments. In this study,a modern Baiyanghe-river alluvial fan is located at the northwestern margin of the Junggar Basin,and it is studied to explore the complex sedimentary characteristics and sedimentary model of alluvial fan,by using abundant outcrop data,hydrological data and alluvial fan publications. According to the depositional mechanism,the Baiyanghe-river alluvial fan belongs to a braided river alluvial fan,with a large scale of fan area(~327.6 km²),gentle slope(4‰~7‰),abundant coarse-grained sediments and little flooding fine-grained sediments. Sixteen lithofacies are recognized in the Baiyanghe-river alluvial fan. According to the hydrodynamic differences,the forming mechanism of lithofacies are classified into five genetic types,which are debris flow,high-flow traction current,low-flow traction current,hydrostatic deposition and aeolian deposition. The constructional process of the Baiyanghe-river alluvial fan can be divided into two periods,flood period and inter-flood period. During the flood period,deposition plays a major role. From proximal to distal part of alluvial fan,six types of microfacies can be recognized,followed as feeder-channel and sheetflood deposition in proximal part,sheetflood and braided-stream deposition in intermediate part,channel and wetland deposition in distal part. However,during the inter-flood period,reworking is the major process. Three microfacies are developed form proximal part to distal part,including main-channel deposition in proximal part,braided-trench deposition in intermediate,and wetland deposition in distal. Each microfacies is in transitional contact,without obvious interface. Sedimentary models of gravelly braided-river alluvial fan were finally established based on the data of Baiyanghe-river alluvial fan.

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	Articles by authors
	Liu Da-Wei
	Ji You-Liang
	Gao Chong-Long
	Jin Jun
	Yang Zhao
	Duan Xiao-Bing
	Huan Zhi-Jun
	Luo Ni-Na

Key words： braided-river alluvial fan microfacies sheetflood zone braided-trench sedimentary model Junggar Basin

Received: 24 October 2017

ZTFLH:

P512.2

Fund:Financially supported by the National Natural Science Foundation of China(Nos. 41672098,41602133)

Corresponding Authors: Ji You-Liang,born in 1962,is a professor of China University of Petroleum(Beijing). He is mainly engaged in researches and teaching of petroleum geology,sedimentology and sequence stratigraphy. E-mail: jiyouliang@cup.edu.cn.

Cite this article:

Liu Da-Wei,Ji You-Liang,Gao Chong-Long et al. Microfacies and sedimentary models of gravelly braided-river alluvial fan: A case study of modern Baiyanghe-river alluvial fan in northwestern margin of Junggar Basin[J]. JOPC, 2018, 20(3): 435-452.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.03.032 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I3/435

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