构造-沉积耦合过程的数值模拟：以南海北部阳江凹陷为例

李法坤; 戴黎明; 杜晓东; 蔡国富; 李三忠; 董昊; 王宇

doi:10.16562/j.cnki.0256-1492.2021040601

构造-沉积耦合过程的数值模拟：以南海北部阳江凹陷为例

1.
深海圈层与地球系统教育部前沿科学中心，海底科学与探测技术教育部重点实验室，中国海洋大学海洋地球科学学院，青岛 266100

2.
青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室，青岛 266237

3.
中海石油（中国）有限公司深圳分公司，深圳 518000

基金项目: 国家自然科学基金重大研究项目“台湾岛弧及邻区新生代古地形地貌数值模拟与动态重塑”（91958214）；青岛海洋科学与技术试点国家实验室鳌山科技创新计划项目（2017ASKJ02）；青岛市创新领军人才计划项目（19-3-2-19-zhc）；泰山学者攀登计划项目（李三忠）

详细信息

作者简介: 李法坤（1995—），男，硕士研究生，从事盆地数值模拟研究，E-mail：lifakun@stu.ouc.edu.cn

通讯作者: 戴黎明（1980—），男，副教授，从事构造地质学及其数值模拟研究，E-mail：dlming@ouc.edu.cn; 李三忠（1968—），男，教授，从事海洋地质学与构造地质学研究，E-mail: sanzhong@ouc.edu.cn

中图分类号: P736.1

收稿日期: 2021-04-06

修回日期: 2021-04-22

刊出日期: 2021-10-28

Numerical modeling of the coupling between strike-slip faulting and sedimentation: A case from the Yangjiang Sag of northern South China Sea

1.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Lab of Submarine Geosciences and Prospecting Techniques, MOE, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

2.
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China

3.
Nanhai East Petroleum Research Institute, Shenzhen Branch, CNOOC China Limited, Shenzhen 518000, China

More Information

Corresponding authors: DAI Liming, dlming@ouc.edu.cn ; LI Sanzhong, sanzhong@ouc.edu.cn

Received Date: 06 April 2021

Revised Date: 22 April 2021

Publish Date: 28 October 2021

摘要

摘要:
以构造变形为核心的内动力过程和以沉积“源–汇”过程为核心的外动力过程，如何动态塑造盆地精细地貌景观，是油气精准勘探必须突破的关键技术。本研究以南海北部陆缘珠江口盆地的阳江凹陷为例，试图探索NW向阳江–一统暗沙深大断裂带对周缘新生代沉降中心分布的控制作用。为此，本文采用Badlands沉积数值模拟方法，定量分析阳江–一统暗沙断裂带的运动学特征，模拟阳江凹陷新生代地层构造-沉积耦合过程。模拟结果显示，阳江–一统暗沙断裂带在始新世末期是一条左行走滑断裂带，其走滑过程主要可分为两个阶段。其中，在早期慢走滑阶段，走滑位移量约800 m，沿断裂带走滑方向，恩平19洼的沉降中心发生迁移；在后期快走滑阶段，走滑位移量约1200 m，模拟剖面可识别出明显的花状构造，恩平19洼的沉降中心加速向北迁移，并发生逆时针旋转。
- 运动学性质 /
- 数值模拟 /
- 阳江–一统暗沙断裂带 /
- 阳江凹陷
Abstract:
To dynamically shape the fine geomorphic landscape of a basin is a key technology required in efficient oil and gas exploration. In this paper, the Yangjiang Sag in the Pearl River Mouth Basin on the northern margin of the South China Sea is selected as a case to explore the NW-trending Yangjiang-Yitong’ansha Blind Fault Zone(YYBFZ) and its control over the distribution patterns of Cenozoic depocenters in its periphery. Badlands’ numerical sedimentation simulation is used to quantitatively analyze the kinematic characteristics of the YYBFZ for further understanding the Cenozoic tectono-sedimentary coupling process of the Yangjiang Sag. The simulation results suggest that the YYBFZ was a sinistral strike-slip fault zone formed by the end of Eocene, and the strike slip process can be divided into two stages. The early stage is a slow strike slip stage, with a strike-slip displacement of about 800 m, and the depocenters of the Enping 19 Subsag migrate along the slip direction of the fault; In the late stage, however, the slip was fast and the displacement of the strike slip may reach the figure about 1200 m, and along the simulation section, obvious flower-like structures are observed. At the same time, the depocenters of the Enping 19 Subsag accelerated its move northward with rotation anticlockwise.
- kinematics /
- numerical modeling /
- Yangjiang-Yitong’ansha Blind Fault Zone /
- the Yangjiang Sag

HTML全文

图 1 阳江凹陷区域构造单元及走滑断层位置^{[15, 23]}

Figure 1.

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图 2 模型基底走滑断裂演化

Figure 2.

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图 3 不同位置的模拟剖面和地震解释对比

Figure 3.

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图 4 不同走滑位移量的剖面对比

Figure 4.

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图 5 模拟的沉积厚度和真实沉积厚度对比

Figure 5.

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图 6 不同走滑分量模式下构造–沉积耦合过程

Figure 6.

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图 7 阳江凹陷恩平19洼沉降中心演化

Figure 7.

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表 1 模型参数

Table 1. Model parameters

模型	模型1	模型2	模型3	模型4	模型5	模型6
性质	非走滑	右行	左行	左行	左行	左行
走滑量/m	2000	2000	2000	1500	2500	3000
侵蚀系数/a⁻¹	3×10⁻⁷	3×10⁻⁷	3×10⁻⁷	3×10⁻⁷	3×10⁻⁷	3×10⁻⁷
降水量/（m/a）	1	1	1	1	1	1

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构造-沉积耦合过程的数值模拟：以南海北部阳江凹陷为例

作者简介: 李法坤（1995—），男，硕士研究生，从事盆地数值模拟研究，E-mail：lifakun@stu.ouc.edu.cn

通讯作者: 戴黎明（1980—），男，副教授，从事构造地质学及其数值模拟研究，E-mail：dlming@ouc.edu.cn; 李三忠（1968—），男，教授，从事海洋地质学与构造地质学研究，E-mail: sanzhong@ouc.edu.cn

Numerical modeling of the coupling between strike-slip faulting and sedimentation: A case from the Yangjiang Sag of northern South China Sea

Corresponding authors: DAI Liming, dlming@ouc.edu.cn ; LI Sanzhong, sanzhong@ouc.edu.cn

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