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过渡动力学背景下的张扭性断陷——以珠江口盆地惠州凹陷古近纪断陷为例
石油实验地质
2009年 31卷 第5期
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Title
ANALYSIS OF TENSE-SHEARING CHARACTERISTICS OF HUIZHOU PALEOGENE FAULT DEPRESSION IN PEARL RIVER MOUTH BASIN
Authors
Yu Shuiming
Shi Hesheng
Mei Lianfu
Shu Yu
Wu Jianyao
单位
中海石油(中国)有限公司深圳分公司, 广州, 510240
2. 中国地质大学, 资源学院, 武汉, 430074
Organization
Shenzhen Branch, CNOOC, Guangzhou, Guangdong 510240, China
2. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, China
摘要
通过断陷结构、构造特征研究及与已有的物理模拟实验结果对比分析,论证了珠江口盆地惠州凹陷古近纪断陷具有典型的张扭性断陷性质,表现为其具有典型的斜列式结构特征,构成断陷的基本要素(如断陷内的洼陷、低凸起、边界断层等)均呈斜列式展布。推测其形成机制主要受主伸展应力方向与基底构造走向斜交控制,从而沿断陷走向产生走滑分量,进而使断陷具有张扭性特征。
Abstract
Tense-shearing characters of the Huizhou Paleogene Fault Depression in the Pearl River Mouth Basin has been proved by analyses of rift construction,tectonic characteristics and comparing with physical simulation results.Sub-sags,low uplifts and faults are usually en echelon-distributed in the Huizhou Paleogene Fault Depression,which is the typical character of tense-shearing rift.It is mainly formed by oblique intersecting between principal extensional stress and base structural strike.When principal extensional stress is oblique with base structural strike,strike-slipping is produced and tense-shearing characters of fault basin are formed.
关键词：
古近纪;
张扭性断陷;
斜列式结构;
惠州凹陷;
珠江口盆地;
Keywords:
Paleogene;
tense-shearing fault depression;
en echelon construction;
Huizhou Sag;
Pearl River Mouth Basin;
DOI
https://doi.org/10.11781/sysydz200905485
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