软弱地质体对反转构造变形制约作用的物理模拟及其应用*

doi:10.11978/j.issn.1009-5470.2012.03.019

热带海洋学报 ›› 2012, Vol. 31 ›› Issue (3): 144-154.doi: 10.11978/j.issn.1009-5470.2012.03.019cstr: 32234.14.j.issn.1009-5470.2012.03.019

软弱地质体对反转构造变形制约作用的物理模拟及其应用*

徐子英^1,2, 孙珍¹, 周蒂¹, 张云帆¹, 孙龙涛¹, 赵中贤^1,2

1.中国科学院边缘海地质重点实验室, 中国科学院南海海洋研究所, 广东广州 510301;2. 中国科学院研究生院, 北京 100049

收稿日期:2011-04-27 修回日期:2011-05-26 出版日期:2012-09-11 发布日期:2012-09-11
作者简介:徐子英(1981—), 女, 江西省上饶市人, 在读博士研究生, 主要从事构造分析与油气系统模拟研究。E-mail: ziyingx06@scsio.ac.cn
通信作者: 孙珍(1971—)。E-mail: zhensun@scsio.ac.cn
* 论文撰写过程中得到了中国科学院南海海洋研究所施小斌研究员、许鹤华副研究员和杨小秋博士的许多有益建议; 审稿专家对本文提出了建设性的评审和修改意见,
基金资助:
国家重点基础研究发展计划(“973”计划)项目(2009CB219401、2007CB41170405); 国家自然科学基金项目(40876026、40806022)

Discussion on the influence of weakness body on inversion structure deformation through analogue modeling and its application

XU Zi-ying^1,2, SUN Zhen¹*, ZHOU Di¹, ZHANG Yun-fan¹, SUN Long-tao¹, ZHAO Zhong-xian^1,2

1. CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2011-04-27 Revised:2011-05-26 Online:2012-09-11 Published:2012-09-11

摘要/Abstract

摘要： 深水盆地的构造变形表明, 大陆边缘上常存在与刚性地质体相对应的软弱地质体, 它们不仅加强了裂陷期的沉降变形, 而且加强了挤压反转期的褶皱隆升。为了揭示软弱地质体对构造变形的影响, 作者利用物理模拟方法设置了4组实验, 基于模拟结果讨论了琼东南盆地西南部反转构造的发育机制。实验对比分析发现, 无论哪种应力场下反转变形都更容易在软弱区集中, 软弱区所处构造位置及其所受应力性质对反转构造发育起着重要的控制作用。通过模拟结果与实际构造对比分析, 认为琼东南盆地西南部构造反转发育主要受斜向挤压应力和软弱体的共同影响, 推测其挤压应力来源于盆地西北部, 可能与印支地块的旋转挤出作用有关。

关键词: 软弱地质体, 反转构造, 物理模拟, 构造应力, 琼东南盆地

Abstract: Deep-sea basin structural deformation indicated that the exist of weakness body in continental margin not only make the sedimentation deformation stronger in rift stage but also make the uplift-fold stronger in inversion stage. In order to investigate the impact of weakness body on structural deformation, we carried out four sets of analogue modeling experiments. Based on the modeling results, we discussed the impact of weakness body on inversion structure deformation in the southwest of the Qiongdongnan Basin. The modeling experiments show that no matter in extension stage or in compression stage, the inversion structural deformation first appears and propagates in weakness zone, the location and the stress direction of weakness body play an important role in the deformation of inversion structure. Based on comparison of modeling results with the actual structures, it is concluded that the deformation of inversion structure in southwest of the Qiongdongnan Basin is mainly influenced by the existence of weakness body and oblique compression; the oblique compression tectonic stress may come from the northwest of the basin and keep its relationship with the revolved Indochina Block by inference.

Key words: weakness body, inversion structure, analogue modeling, tectonic stress, Qiongdongnan Basin

中图分类号:

P736

徐子英, 孙珍, 周蒂, 张云帆, 孙龙涛, 赵中贤. 软弱地质体对反转构造变形制约作用的物理模拟及其应用*[J]. 热带海洋学报, 2012, 31(3): 144-154.

XU Zi-ying, SUN Zhen*, ZHOU Di, ZHANG Yun-fan, SUN Long-tao, ZHAO Zhong-xian. Discussion on the influence of weakness body on inversion structure deformation through analogue modeling and its application[J]. Journal of Tropical Oceanography, 2012, 31(3): 144-154.

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软弱地质体对反转构造变形制约作用的物理模拟及其应用*

Discussion on the influence of weakness body on inversion structure deformation through analogue modeling and its application

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