南海白云凹陷东南部两种不同类型块体搬运沉积体系的地震响应及成因分析

doi:10.11978/2020114

Abstract

Abstract:

Mass-transport complexes (MTCs) are one of the gravity-driven depositional process. MTCs contain slides, slumps, and debris deposits in submarine settings. The occurrence of MTCs can generate submarine geo-hazards (i.e., tsunami), and the fast traveling mass can destroy offshore constructions (e.g., pipelines and communication cables). MTCs can also act as seals for submarine hydrocarbon accumulation, due to their over-compacted nature. In this study, we use 3D seismic reflection data, to reveal the internal reflection characteristics, external morphology, and kinematic indicators of two types of MTCs in the southeast of the Baiyun Sag, the South China Sea. We interpreted four distinct seismic facies in the study area, including: 1) low amplitude, horizontal and continuous seismic reflections, 2) high amplitude, undulating and continuous seismic reflections, 3) low amplitude, semi-transparent to chaotic seismic reflections, and 4) moderate-to-high amplitude continuous seismic reflections. We classified two different types of MTCs based on their scale (i.e., thickness) and seismic facies characteristics in the Upper Miocene assemblage. Type 1 MTCs consist of several small-scale MTCs, showing low amplitude, semitransparent to chaotic seismic reflections. Type 2 MTCs have larger scale, consisting of low amplitude, semitransparent to chaotic seismic facies moderate-to-high amplitude continuous seismic reflections. The widely distributed MTCs in the study area could be corelated with the high sedimentation rates and earthquakes during the Late Miocene. Our study indicates that the Dongsha event (associated seismic activity and formation uplift) is the major trigger for the occurrence of MTCs. Our result can help better understand the triggers and formation process of MTCs during the Late Miocene in the Baiyun Sag. A better understating of the distribution and occurrence of MTCs in the study area will help us better determine the location of buried MTCs, as well as conducting research for the formation mechanism of paleo-MTCs in the South China Sea.

Key words: Baiyun Sag, South China Sea, Mass-transport complexes, Seismic characteristics, triggering mechanism

CLC Number:

P736.1

LI Yan, WU Nan, HU Shouxiang, ZHAO Fang, ZHAN Wenhuan. Seismic characteristics and triggering mechanism analysis of two types of mass-transport complexes in the southeast of Baiyun Sag, South China Sea[J].Journal of Tropical Oceanography, 2021, 40(5): 85-100.

Figures/Tables 7

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分类	地质组成	所在沉积单元	发育数量/个	平均厚度/m	地震相	边界特征
多期MTC复合体	由6期厚度较薄(约20m)的MTCs共同组成	单元2	1	80	SFc1	边界模糊
单期MTCs	由单期独立存在的MTCs构成	单元3和单元4	4	30	SFc1和SFc2	边界清晰

Seismic characteristics and triggering mechanism analysis of two types of mass-transport complexes in the southeast of Baiyun Sag, South China Sea

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