Characteristics and Genetic Mechanism of a Large⁃Scale Submarine Gravity-Driven System in Huaguang Depression, Qiongdongnan Basin

被引：1

作者：

Li L. ^{[1
]}

Zhang C. ^{[2
,3
]}

Yan C. ^{[1
]}

Yang T. ^{[1
]}

Xie X. ^{[2
]}

Wang S. ^{[2
]}

Chu S. ^{[2
]}

机构：

[1] PetroChina Hangzhou Institute of Geology, Hangzhou

[2] Hubei Key Laboratory of Marine Geology Resources, China University of Geosciences, Wuhan

[3] Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 10期

关键词：

Hydrocarbon; Mass transport deposit; Qiongdongnan basin; Seismic reflection characteristics; Submarine gravity⁃driven system; Trigger mechanism;

D O I：

10.3799/dqkx.2021.014

中图分类号：

学科分类号：

摘要：

The study on submarine gravity-driven system (SGDS) is of great significance to understand the stability of submarine slope and the deep-water sedimentary processes. A large-scale SGDS sliding from south to north developed in the upper Miocene and above strata in the Huaguang depression of the Qiongdongnan basin, northern margin of the South China Sea. Based on regional 2D seismic data, in this paper it describes the characteristics of seismic facies and development of this large-scale SGDS and discusses its genetic mechanism. The development of the SGDS, composed of five elements including extensional domain, transitional domain, contractional domain, sliding surface and weak layer, could be divided into three stages as follows: the Late Miocene pre-gravity-sliding stage, the Pliocene syn-gravity-sliding stage, and the Quaternary post-gravity-sliding stage. During the fore-gravity-sliding stage, the channel complex was deposited on the bathyal argillaceous slope, and served on the material basis for gravity sliding. During the syn-gravity-sliding stage, which is the main stage of the SGDS development, the sediments were draped on the topography caused by intense deformation, and at the same time, there was also a certain degree of deformation. During the post-gravity-sliding stage, meaning the shrinking of the SGDS, the sediments gradually filled up the topography caused by gravity sliding and continued to deposit. It is indicated that the slope topography and high-speed sediment supply is the basis for the development of the SGDS, and the activation of basement faults and diapirism may be the trigger for its development. © 2021, Editorial Department of Earth Science. All right reserved.

引用

页码：3707 / 3716

页数：9

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