南海北部陆坡区神狐海域构造特征及对水合物的控制
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学青年基金项目(No. 41202080);广东省自然科学基金博士启动项目(No. S2012040006333);国家自然科学基金-广东联合基金项目(No. U0933004);中国科学院广州能源研究所所长创新基金项目(No. y107r61001)


Structural characteristics and the influences on gas hydrate in Shenhu Area in northern continental slope of the South China Sea
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    通过对南海北部陆坡区神狐海域高精度2D和3D地震资料的精细解释,在研究区共识别出4种构造类型,分别为气烟囱(流体底辟)、区域大尺度断层、深水扇中的正断层和滑移体中的滑脱断层。气烟囱具有直立的通道形态,其内部结构可划分为杂乱反射带、模糊反射带和顶部强振幅区域。大尺度断层位于水合物钻探区的西北部和东北部,断层规模大,对深部地层表现出明显的控制作用。深水扇中的正断层广泛发育于上新世的深水扇中,特别是水合物钻探区西部进积特征明显的深水扇中,正断层的数量更多。滑移体中的滑脱断层在神狐海域的第四纪地层中非常常见,在剖面上呈雁列式分布。研究结果表明,大尺度断层由于和水合物钻探区的距离较远,对于水合物的成藏可能不起控制作用。气烟囱和规模小数量多的断裂体系为含气流体的运移提供了垂向和侧向的输送通道,构成了水合物的流体运移体系。当富含甲烷气体的流体通过这些垂向-侧向的运移通道时,在合适的温压条件下,被适于水合物聚集的沉积体所捕获,就有可能形成水合物。水合物钻探区内东西部构造特征的差异,使得研究区内形成了不同的流体运移体系,这可能是控制钻探区水合物不均匀性分布的一个关键因素。

    Abstract:

    Based on the integrated analysis of high-resolution seismic data (2D/3D), four structure styles, gas chimneys (fluid diapirs), large-scale faults, normal faults in submarine fan, and detachments faults in slide, could be identified in Shenhu Area in northern continental slope of the South China Sea. On the seismic profiles, gas chimneys displayed as the obviously vertical courses, which were composed of chaotic reflector zone, misty reflector zone and top high-amplitude reflector zone. The large-scale faults were located at the northwest and northeast of the study area, which would control the sedimentation of the deep strata. The normal faults showed the closed relationship with the progradation character of the Pliocene submarine fan, especially in the west of the gas hydrate drilling area. In the Quaternary, the detachments faults were widely distributed in the slide with the echelon pattern on the seismic profiles. The results shows that the large-scale faults could not control the formation of gas hydrate in the drilling area considering the long distances, whereas the gas chimneys and small-scale faults, including the normal faults in submarine fan and detachments faults in slide, would act as the migration pathways for the fluid/gas. So in the Shenhu gas hydrate drilling area, the gas chimneys associated with the faults could be regarded as the gas-bearing fluid influx system. Once the methane-bearing fluid migrating through the vertical and lateral pathways entered the gas hydrate stability zone and captured by the favorable deposits, the gas hydrate would be formed and stored. Further, the tectonic setting in the Shenhu gas hydrate drilling area could lead to the differences of the fluid influx system between the western and the eastern, which might be a crucial factor for the distribution of gas hydrate.

    参考文献
    相似文献
    引证文献
引用本文

苏明,杨睿,吴能友,王宏斌,梁金强,沙志彬,丛晓荣,乔少华.2014.南海北部陆坡区神狐海域构造特征及对水合物的控制[J].地质学报,88(3):318-326.
SU Ming, YANG Rui, WU Nengyou, WANG Hongbin, LIANG Jinqiang, SHA Zhibin, CONG Xiaorong, QIAO Shaohua.2014. Structural characteristics and the influences on gas hydrate in Shenhu Area in northern continental slope of the South China Sea[J]. Acta Geologica Sinica,88(3):318-326.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2013-03-15
  • 最后修改日期:2013-03-22
  • 录用日期:2013-04-01
  • 在线发布日期: 2014-03-11
  • 出版日期: