永乐龙洞地震立体观测正演模拟分析  

Forward Modeling Analysis of Seismic Stereoscopic Observation in Yongle Blue Hole Area

作　　者：徐德卫 刘怀山[1] Xu Dewei;Liu Huaishan(Key Lab of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao Shandong 266100,China)

机构地区：[1]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《工程地球物理学报》2020年第6期689-696,共8页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金资助项目(编号:91958206,41230318);国家高技术研究发展计划(863计划)资助项目(编号:2013AA092501)。

摘　　要：永乐龙洞内部复杂的构造形态对指示南海的形成演化具有重要意义,利用立体观测系统探测龙洞形态是当前重要的研究课题,特别是在地震响应以及成像特点等方面的研究尚处于起步阶段。为研究龙洞地震响应特征,针对龙洞区域地质结构,在龙洞形态数据的基础上绘制三维形态图,并以此建立地质模型。在水平缆与垂直缆联合的立体观测系统下,开展龙洞的地震波场特征正演模拟研究。通过模拟结果对比分析出同一震源激发不同观测方式下龙洞的波场特征,并在此基础上总结龙洞的地质特征对应的地震响应。模拟结果表明,采用立体观测方式可以采集丰富的波场信息,并能很好地适应龙洞环境,为龙洞区域实际探测提供参考依据。The complex tectonic morphology of Yongle blue hole is of great significance to the formation and evolution of the south China sea,and it is an important research topic to use the stereoscopic observation system to detect the Yongle blue hole morphology,especially in the aspects of seismic response and imaging characteristics.In order to study the seismic response characteristics of Yongle blue hole,a 3D morphological map is drawn on the basis of Yongle blue hole regional geological structure,and the geological model is established based on the Yongle blue hole morphological data.Under the stereoscopic observation system of horizontal and vertical cables,the forward modeling of seismic wave field characteristics in Yongle blue hole is carried out.Through the simulation results,the wave field characteristics of Yongle blue hole under different observation modes excited by the same source are compared and analyzed,and on this basis,the seismic response corresponding to the geological characteristics of Yongle blue hole is summarized.The simulation results show that the 3D observation method can collect abundant wave field information and adapt to the environment of Yongle blue hole,which provides reference for the actual detection of Yongle blue hole area.

关 键 词：永乐龙洞 立体观测系统 正演模拟 波场特征 

分 类 号：P631.4[天文地球—地质矿产勘探]