| 琼东南盆地新生代伸展量的时空分布研究 |
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| 引用本文： | 张焱,唐历山,甘军,熊小峰,段亮,朱继田,周永章.琼东南盆地新生代伸展量的时空分布研究[J].大地构造与成矿学,2020(2):267-275. |
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| 作者姓名： | 张焱 唐历山 甘军 熊小峰 段亮 朱继田 周永章 |
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| 作者单位： | 中海石油（中国）有限公司湛江分公司;中山大学地球科学与工程学院;广东省地质过程与矿产资源探查重点实验室 |
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| 基金项目： | “十三五”国家重大科技专项“琼东南盆地深水区大中型气田形成条件及勘探关键技术”(2016ZX05026-002)资助。 |
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| 摘 要： | 以琼东南盆地新生代20条骨干地震剖面的构造解释为基础,利用平衡剖面技术计算了各剖面不同位置的伸展量、伸展率和伸展系数,并分析了伸展量的时空分布规律。同时采用分形法对平衡剖面技术所得到的伸展量产生的差值进行补偿分析,以验证平衡剖面技术在琼东南盆地的适应性。研究表明,琼东南盆地新生代具有多期伸展特点,伸展量时空分布不均匀。空间上,伸展量主要由盆地主控断层位移造成,主控断层位移较大处对应的伸展量大,盆地东区伸展率高于西区;时间上,水平伸展运动可分为始新世、渐新世和中新世3个时期,水平伸展量分布不均匀,伸展量主要发生在陵水和崖城组时期。其中,始新世伸展主要发生在乐东长昌凹陷,渐新世伸展主要发生在盆地中部。
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| 关 键 词： | 琼东南盆地 新生代 伸展量 分形 时空分布 |
Spatial and Temporal Distribution of the Cenozoic Stretches in the Qiongdongnan Basin |
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| ZHANG Yan,TANG Lishan,GAN Jun,XIONG Xiaofeng,DUAN Liang,ZHU Jitian,ZHOU Yongzhang.Spatial and Temporal Distribution of the Cenozoic Stretches in the Qiongdongnan Basin[J].Geotectonica et Metallogenia,2020(2):267-275. |
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| Authors: | ZHANG Yan TANG Lishan GAN Jun XIONG Xiaofeng DUAN Liang ZHU Jitian ZHOU Yongzhang |
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| Institution: | (Zhanjiang Branch of China National Offshore Oil Corporation(CNOOC)Limited,Zhanjiang 524057,Guangdong,China;School of Earth Science and Geological Engineering,Sun Yat-sen University,Guangzhou 510275,Guangdong,China;Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Survey,Guangzhou 510275,Guangdong,China) |
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| Abstract: | Based on the interpretation results of the structural characteristics of 20 seismic profiles of the Cenozoic in the Qiongdongnan Basin,the stretch,the extensional coefficient and the extensional ratio have been calculated by a balanced geological cross-section technique,and the spatial and temporal distribution of the stretches has been analyzed in this paper.At the same time,the fractal method is used to compensate the difference between the extensions obtained by the balanced geological cross-section technique.In order to verify the adaptability of the technique in the Qiongdongnan Basin.The results show that the Qiongdongnan Basin has multi-period stretching in Cenozoic,which is unevenly distributed both spatially and temporally.The stretch is mainly controlled by the displacement of the main fault,and positively correlated to the stretching displacement of the main basin boundary faults.The extension rate of the eastern area of the basin is higher than that of the western area.The main extensional period can be divided into three periods such as Eocene,Oligocene and Miocene.The horizontal extension is unevenly distributed,and stretching mainly occurs during Lingshui and Yacheng Formation periods.The extension of Eocene mainly occurred in the Ledong and Changchang Sags,the extension of Oligocene occurred mainly in the middle of the basin. |
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| Keywords: | Qiongdongnan Basin Cenozoic extension amount fractal time and space distribution |
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