海底水道体系沉积构型样式及控制因素:以尼日尔三角洲盆地陆坡区为例<sup>*</sup>

doi:10.7605/gdlxb.2018.05.058

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Abstract

As an important target of the present-day hydrocarbon exploration and development,submarine channels have complex styles of sedimentary architecture and the associated controlling factors are still poorly understood,which significantly raises the risk of drilling of the hydrocarbon reservoirs and the difficulty of development. Taking the Niger Delta slope as an example,the present study,utilizing the high-resolution seismic data from the shallow subsurface,reveals the styles of channel-system external morphology and internal construction,probes the relationships among morphological parameters of the channel system and the channel complex,and analyzes the controlling factors of the submarine-channel sedimentary architecture. It is suggested that: (1)The channel system could be divided into three categories, i.e., confined channel system,semi-confined channel system and unconfined channel system. The boundaries of the confined and semi-confined channel system are obvious erosional surfaces and the latter commonly develops levee deposits;the unconfined channel system,however,does not have the erosional surface. In addition,each kind of the channel system could be further divided into two subgroups(the incised one and the enveloped one). (2)The channel complex within the channel system has the agrradational type as well as the accreted type;the former consists of the isolated,superposed as well as cut-and-fill group and the latter includes the cut-and-fill and detached group. (3)The slope gradient has closed relationship with the channel-system type and scale;in the reaches having steep gradients(>1°)and gentle gradients(0.5°~1°),confined channel system and semi-confined channel systems are respectively dominated,however,unconfined channel system mainly shows up in the flat section of the slope(<0.5°). With the increasing of slope gradients,the widths and heights of the channel system would respectively decrease and increase and thus,resulting the rapid decrease of the ratio of width to height. That is,the channel system tends to be‘narrow and deep’. The current study leads to some new interpretations of deep-water sedimentology and is of great significance for the high-efficient development of associated reservoirs.

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	Articles by authors
	Zhao Xiao-Ming
	Liu Li
	Tan Cheng-Peng
	Fan Ting-En
	Hu Guang-Yi
	Zhang Ying-Chun
	Zhang Wen-Biao
	Song Lai-Ming

Key words： submarine channel sedimentary architecture architecture style slope gradient evolution pattern

Received: 28 June 2018

ZTFLH:

P512.2

Fund:

National Natural Science Foundation of China (Nos. 41872142,41602145, 41402125, 41602117)

About author: Zhao Xiao-Ming,born in 1982,is an associate professor of Southwest Petroleum University. He is mainly engaged in research on hydrocarbon development geology. E-mail: zhxim98@163.com.

Cite this article:

Zhao Xiao-Ming,Liu Li,Tan Cheng-Peng et al. Styles of submarine-channel architecture and its controlling factors: A case study from the Niger Delta Basin slope[J]. JOPC, 2018, 20(5): 825-840.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.05.058 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I5/825

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