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首页> 外文期刊>Journal of Asian earth sciences >Numerical modeling of Late Miocene tectonic inversion in the Xihu Sag, East China Sea Shelf Basin, China
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Numerical modeling of Late Miocene tectonic inversion in the Xihu Sag, East China Sea Shelf Basin, China

机译：中国东海陆架盆地西湖凹陷中新世晚期构造反演数值模拟

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摘要

The East China Sea Shelf Basin is an important oil- and gas-bearing basin in the West Pacific continental margin. This region was affected by subduction of the Pacific Plate and the Philippine Plate in Cenozoic and experienced multi-stage tectonic inversions. This paper presents results from a numerical simulation by finite element method to the Xihu Sag in the East China Sea Shelf Basin and neighboring areas in an attempt to evaluate the WNW-directed compression on the sag during Late Miocene. Based on comprehensive structural analysis of a large number of seismic profiles, we determine the structural geometry of the sag, including the basement of the basin, the sedimentary cover, and 29 major faults in the Xihu Sag. Simulation results show that under continuous WNW-directed compression, tectonic inversion occurred firstly in the Longjing and Yuquan tectonic zones in the sag. Based on quantitative analysis of vertical displacement field of the Xihu Sag and peripheral areas and its stress intensity evolution, we identify a com-pressional regime in the Longjing Anticline Zone with a gradually propagated uplifting from south to north; whereas the propagation of uplifting in the Yuquan Anticline Zone is from north to south. The inversion intensity decreases from north to south. The formation of the tectonic inversion zone in the Xihu Sag is not only correlated to the direction of compression and fault patterns in the basin, but also closely related to the spatial configuration of fault surfaces of the Xihu-Jilong Fault in the Xihu Sag.
机译：东海陆架盆地是西太平洋大陆边缘的重要油气盆地。该地区受到了新生代太平洋板块和菲律宾板块俯冲的影响，经历了多期构造反转。本文对东海陆架盆地及邻近地区的西湖凹陷进行了有限元数值模拟，以评估中新世晚期凹陷对西北向的压缩。在对大量地震剖面进行综合结构分析的基础上，我们确定了凹陷的结构几何形状，包括盆地的基底，沉积盖层和西湖凹陷的29个主要断层。模拟结果表明，在连续的西北西北向压缩作用下，凹陷的龙井和玉泉构造带首先发生了构造反转。在对西湖凹陷及周边地区垂直位移场及其应力强度演化进行定量分析的基础上，确定了龙井背斜带的一种压缩方式，其隆起由南向北逐渐扩展。玉泉背斜带隆升的传播是从北向南。反演强度从北向南减小。西湖凹陷构造反转带的形成不仅与盆地的压缩方向和断层模式有关，而且与西湖凹陷西吉吉隆断裂的断面空间分布密切相关。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|25-37|共13页
  • 作者

    Liming Dai; Sanzhong Li; Da Lou; Xin Liu; Yanhui Suo; Shan Yu;

  • 作者单位

    Key Lab of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100, China,College of Marine Geosciences, Ocean Univer-sity of China, No. 238, Songling Road, 266100 Qingdao, Shandong Province, China;

    Key Lab of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100, China,College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;

    Dagang Oil Field Company, Ltd., CNPC, Dagang 300280, China;

    Key Lab of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100, China,College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;

    Key Lab of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100, China,College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;

    Key Lab of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100, China,College of Marine Geosciences, Ocean University of China, Qingdao 266100, China;

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  • 正文语种 eng
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  • 关键词

    The East China Sea Shelf Basin; The Xihu Sag; Tectonic inversion; Numerical modeling;

    机译：东海陆架盆地;西湖凹陷构造反转数值模拟;

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