西湖凹陷花港组浅水三角洲平原分流河道沉积构型<sup>*</sup>

doi:10.7605/gdlxb.2024.03.049

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Abstract

The upper Oligocene Huagang Formation is crucial for oil and gas exploration in the central and southern Xihu sag of the East China Sea Shelf Basin. However,there has been ongoing debate on the sedimentary system,and limited research has been conducted on the characteristics of sand body architecture and the controlling factors. This paper studied the sedimentary environment,microfacies types,sand body architecture,and controlling factors of the upper Oligocene Huagang Formation through a comprehensive analysis of core,logging,and seismic data. The upper Huagang Formation in the central-south part of Xihu sag shows shallow-water delta plain sedimentation,with distributary channels being the predominant type of sand body. These distributary channels are categorized into three types based on their curvature: braided(curvature=1~1.05),meandering(curvature>1.15),and braided-meander transition(curvature=1.05~1.15). The sand bodies found in braided distributary channels are wide and thick,with intertwined wide bands. Channel bars in these channels are arranged in a speckled pattern. The sand body’s vertical stacking style is mainly characterized as incised stacking. In contrast,the sand bodies in meandering channels are narrow and thin,appearing as either single strip type or bifurcation-merging type in the planar direction. Thick sand layers are distributed as point bars in the channel margin,and the vertical stacking style is mostly isolated. The braided-meandering type of diversion channel is a transitional type between braided and meandering channels. It is characterized by moderate-sized channel sand bodies containing inner channel bars and point bars. The thickness and width of these distributary channels are positively correlated in a logarithmic manner. The ratio of width to thickness follows the pattern of braided type>transitional type>meandering type. The architecture characteristics of distributary channels are primarily influenced by paleogeomorphology and changes in base levels. Paleogeomorphology controls changes in channel types within shallow water delta plain,and low curvature braided distributary channels are more likely to develop in steep terrain. As the long-term base level increases,the size of distributary channels decreases,while a rise in mid-term base level has resulted in the transition of distributary channel sand bodies from incised to superimposed and isolated stacking types. This research enhances our understanding of the sedimentary structure of shallow water deltas and provides valuable guidance for predicting and developing distributary channel reservoirs in underground shallow water deltas within oil and gas fields.

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	YANG Zheng
	WU Shenghe
	DUAN Dongping
	XU Zhenhua
	XIONG Qicong
	ZHANG Yufei

Key words： East China Sea Shelf Basin Xihu sag Oligocene Huagang Formation shallow-water delta distributary channel sedimentary architecture

Received: 05 December 2023

ZTFLH:

P512.2

Fund:

Financially supported by the National Natural Science Foundation of China(No.42272110)

Corresponding Authors: WU Shenghe,born in 1964,is a professor and Ph.D. supervisor of China University of Petroleum(Beijing). He is mainly engaged in sedimentology,reservoir characterization and modelling.E-mail: reser@cup.edu.cn.

About author: YANG Zheng,born in 1995,is a Ph.D. candidate of China University of Petroleum(Beijing). He is mainly engaged in sedimentology,reservoir characterization and modelling.E-mail: 632255079@qq.com.

Cite this article:

YANG Zheng,WU Shenghe,DUAN Dongping et al. Architecture characteristics of distributary channels in shallow water delta plain of the Huagang Formation in Xihu sag,East China Sea[J]. JOPC, 2024, 26(3): 525-544.

URL:

http://www.gdlxb.cn/EN/10.7605/gdlxb.2024.03.049 OR http://www.gdlxb.cn/EN/Y2024/V26/I3/525

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