Sedimentary characteristics and genesis of the deepwater channel system in Zhujiang Formation of Baiyun-Liwan Sag

被引：7

作者：

Liao J. ^{[1
]}

Xu Q. ^{[1
]}

Chen Y. ^{[1
]}

Wang Y. ^{[1
]}

Cai L. ^{[1
]}

Zou M. ^{[1
]}

Zeng Q. ^{[1
]}

Jiao Z. ^{[1
]}

机构：

[1] Research Institute of CNOOC, Beijing

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2016年 / 41卷 / 06期

关键词：

Baiyun sag; Deepwater channel system; Deepwater exploration; Liwan sag; Pearl River Mouth Basin; Petroleum geology; Zhujiang Formation;

D O I：

10.3799/dqkx.2016.086

中图分类号：

学科分类号：

摘要：

The deepwater channel system is a large-scale deepwater sedimentary system which was newly found in abyssal mudstone of the upper Zhujiang Formation, eastern margin of Baiyun-Liwan sag in recent years. However, its sedimentary characteristics, sedimentary processes and main controlling factors are unclear yet. Based on substantial 2-D, 3-D seismic and well logging data, the depositional elements, geometry, internal architecture and sedimentary evolution of the deepwater channel system in Miocene Zhujiang Formation of Baiyun-Liwan sag were studied. In addition, the source supply, shelf break belt, palaeogeomorphology and their controlling effects on distribution, internal architecture and evolution of the deepwater channel system were discussed. Finally, the genetic mechanism of it was built. The results show that the deepwater channel system consists of channel, levee, and lobe, and channel is the primary depositional element. The deepwater channel can be subdivided into Baiyun sag segment, southern uplift segment and Liwan sag segment from north to south, which is mainly erosional channel, erosional-aggradational channel and aggradational channel, respectively. And it presents an evolutionary characteristic of “third-order channel” from north to south because the energy of gravity flow weakened by descending order. Two periods of channel evolution in vertical succession can be identified in each segment by identifying secondary erosional surfaces in the interior of channel. And there are distinctive internal filling properties in different channel evolution and different segments because of different fillings and transformation processes. The formation and development of deepwater channel system resulted from the interaction between the northern Pearl River Delta, shelf break belt and restricted paleotopography in eastern Baiyun-Liwan sag. © 2016, Editorial Department of Earth Science. All right reserved.

引用

页码：1041 / 1054

页数：13

共 23 条

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