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珠一坳陷番禺4洼新生代断裂特征及其区域动力背景
吴智平,胡阳,钟志洪
0
(中国石油大学地球科学与技术学院,山东青岛 266580;中海石油中国有限公司深圳分公司,广东广州 510240)
摘要:
运用丰富的三维地震资料,通过断裂体系静态刻画和动态分析,对番禺4洼断裂发育的时空差异性及构造转型机制进行研究。结果表明:受控于滨(环)太平洋、特提斯-喜马拉雅两大构造域的区域演化背景,番禺4洼新生代断裂体系发育时空差异性明显;拉张裂陷期(E2w—E2e)经历了由NE向断裂控洼到NWW、近EW向断裂控洼的转变,裂后拗陷期(E3z—N1z—N1h)断裂活动减弱、消亡,构造活化期(N1y—Q)表现为先期发育的NWW向、近EW向断裂复活和新的近EW向断裂的产生,且走滑特征明显;现今断裂体系特征体现了多期构造运动的叠加效应。
关键词:  断裂发育特征  成因机制  新生代  番禺4洼  珠一坳陷
DOI:10.3969/j.issn.1673-5005.2015.04.001
基金项目:中海石油(中国)有限公司重大科技攻关项目(YXKY-2012-SZ-01);中央高校基本科研业务费专项(13CX06015A)
Cenozoic faults characteristics and regional dynamic background of Panyu 4 sub-sag, Zhu Ⅰ Depression
WU Zhiping,HU Yang,ZHONG Zhihong
(School of Geosciences in China University of Petroleum, Qingdao 266580, China;Shenzhen Branch of CNOOC, Guangzhou 510240, China)
Abstract:
Using abundant 3D seismic data, this paper analyzed the static and dynamic characteristics of the fault system of Panyu 4 sub-sag, and then studied its spatio-temporal differences and the mechanisms of the structural transformation. The results show that the development of the fault system in Panyu 4 sub-sag is mainly controlled by the regional evolution of the Circum-Pacific and the Tethyan-Himalayan tectonic domains, and its spatio-temporal differences are also significant. During the rifting stage (E2w-E2e), the strike of the strongly active sag-controlling faults changed from NE to NWW and subparallel EW. During the depression period (E3z-N1z-N1h), the activity of those faults decreased and stopped. In the tectonic activation stage (N1y-Q), the above NWW and subparallel EW pre-existing faults were reactivated and some new subparallel EW faults were developed with significant characteristics of strike slipping. At present the fault system characteristics reflect the superimposed effects of multistage tectonization.
Key words:  fault development characteristics  genetic mechanism  Cenozoic  Panyu 4 sub-sag  Zhu Ⅰ Depression
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