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首页> 外文期刊>Journal of Asian earth sciences >The segmentations and the significances of the Central Canyon System in the Qiongdongnan Basin, northern South China Sea
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The segmentations and the significances of the Central Canyon System in the Qiongdongnan Basin, northern South China Sea

机译：南海北部琼东南盆地中央峡谷系统的分割及其意义

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摘要

The submarine canyons as the important element of the source to sink have attracted the widespread interests in studying their morphologic features, stratigraphic frames, depositional architectures, as well as the related depositional model, hydrodynamic simulation, and hydrocarbon exploration. The Central Canyon System, a large axial submarine canyon, in the Qiongdongnan Basin is developed in Neogene passive continental margin of northern South China Sea, which is paralleled to the shelf break with an "S-shaped" geometry and an NE-NEE orientation. Based on the integrated analysis of high-resolution 2D/ 3D seismic data and well log data, the whole canyon could be divided into three segments from west to east through its distinct morphological and depositional architecture characteristics, the head area, the western segment and the eastern segment. The canyon shows the classical U-shaped morphology in seismic profiles, and the infillings are composed of a suit of turbidite channel complex in the head area. In the western segment, the canyon demonstrates the sinuous geometry and multiple-shaped morphology in seismic profiles. Four complexes of turbidite channel and mass transport complex (MTC) are observed, which could constitute into two stratigraphic cycles. The canyon in the eastern segment shows V-shaped morphology with steep flanks and a narrow and straight course, which is composed of collapse deposits in the flanks and the sheet sand-MTC complex. The sediment supply, northern continental slope system, paleo-geomorphic characteristics and tectonic setting in the Qiongdongnan Basin are considered as the controlling factors on the development and evolution of the Central Canyon System, each of them have different influences in the three segments. The turbidite channel in the head area was triggered by the abundant sediment supply from western source together with the fault activity at 5.7 Ma of the Red River Fault. The evolution of the canyon in the western segment should be the combined effects of the turbidite channel from western source, the mass transport complex from the northern continental slope, and the paleo-seafloor geomorphology. In the eastern segment, the canyon should be constrained by the semi-closed subbasin in eastern Qiongdongnan Basin corresponding to the tectonic transformation at about 11.6 Ma. This unique submarine canyon in the Qiongdongnan Basin is suggested to be characterized by axial gravity flow, ascribing to different gravity deposits originated from different sediment supplies and the tectonic activities.
机译：海底峡谷作为下沉来源的重要元素，在研究其形态特征，地层框架，沉积构造以及相关的沉积模型，流体动力学模拟和油气勘探方面引起了广泛的兴趣。琼东南盆地中的中央峡谷系统是一个大型的轴向海底峡谷，位于南海北部新近纪的被动大陆边缘，与带“ S形”几何形状和NE-NEE方位的陆架断裂平行。在对高分辨率2D / 3D地震数据和测井数据进行综合分析的基础上，整个峡谷可通过其独特的形态和沉积构造特征，水头区域，西段和西段将其从西向东划分为三个部分。东段。峡谷在地震剖面上显示出经典的U形形态，并且填充物由头部区域的一组浊浊通道复合体组成。在西部地区，峡谷在地震剖面中显示出弯曲的几何形状和多形形态。观察到了四个浊积体通道和质量传输复合体（MTC）的复合体，它们可能构成两个地层旋回。东段的峡谷呈V形形态，具有陡峭的侧翼和狭窄而笔直的走向，其由侧翼中的塌陷沉积物和板状砂-MTC复合体组成。琼东南盆地的沉积物供应，北部大陆斜坡系统，古地貌特征和构造背景被视为影响中央峡谷系统发展和演化的控制因素，它们在这三个部分中都有不同的影响。西部地区大量的泥沙供应以及红河断层5.7 Ma处的断层活动触发了顶部区域的浑浊通道。西部段峡谷的演化应该是来自西部源的浊浊通道，来自北部大陆坡的大量输运复合体以及古海底地貌的综合作用。在东部，该峡谷应受琼东南盆地东部半封闭盆地的约束，这对应于约11.6 Ma的构造转换。琼东南盆地这个独特的海底峡谷被认为具有轴向重力流的特征，这归因于源自不同沉积物供应和构造活动的不同重力沉积。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第ptaa期|552-563|共12页
  • 作者

    Ming Su; Xinong Xie; Yuhong Xie; Zhenfeng Wang; Cheng Zhang; Tao Jiang; Yunlong He;

  • 作者单位

    Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences, Guangzhou 5W640, China ,Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China;

    Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China;

    China National Offshore Oil Zhanjiang Ltd., Corporation, Zhanjiang 524057, China;

    China National Offshore Oil Zhanjiang Ltd., Corporation, Zhanjiang 524057, China;

    Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China;

    Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China;

    Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Central Canyon System; Qiongdongnan Basin; Northern South China Sea;

    机译：中央峡谷系统;琼东南盆地;南海北部;

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