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地球介质自组织性对地震波走时和振幅的影响
引用本文:徐涛,宁俊瑞,刘春成,李守林.地球介质自组织性对地震波走时和振幅的影响[J].地球物理学报,2007,50(4):1174-1181.
作者姓名:徐涛  宁俊瑞  刘春成  李守林
作者单位:1.岩石圈演化国家重点实验室,中国科学院地质与地球物理研究所,北京100029 2 中国石化石油勘探开发研究院,北京100083 3 中国海洋石油天津分公司,天津300452 4 中国石化国际勘探公司,北京100081
基金项目:国家自然科学基金项目(40234044,40374010,40404009),国家973项目(2002CB412604)资助
摘    要:本文采用随机介质描述地球内部大尺度背景场上存在的小尺度不均匀性和自组织结构;文中没有采用传统的层状网格结构,提出了块状结构来描述复杂的二维自组织结构的方法,分别以高斯型、指数型和von Karman型等自相关函数描述各向同性和各向异性非均匀分布自组织特征;采用射线追踪分析了不同分布特征自组织结构对地震波运动学和动力学特征参数的影响;结果表明,由于地球内部介质的自组织性存在,地震波射线轨迹可能发生明显的畸变; 不同偏移距处,地震反射振幅减弱或增强; 自组织结构从高斯型到von Karman型,在小尺度上表现更大的非均匀性,因此走时和振幅表征依次更强的平均效应.

关 键 词:自组织结构  块状模型  地震波  射线轨迹  走时  振幅  
文章编号:0001-5733(2007)04-1174-08
收稿时间:2006-6-15
修稿时间:2006-06-15

Influence of the self-organization of the Earth interior upon the traveltime and amplitude of seismic wave
XU Tao,NING Jun-Rui,LIU Chun-Cheng,LI Shou-Lin.Influence of the self-organization of the Earth interior upon the traveltime and amplitude of seismic wave[J].Chinese Journal of Geophysics,2007,50(4):1174-1181.
Authors:XU Tao  NING Jun-Rui  LIU Chun-Cheng  LI Shou-Lin
Institution:1.State Key Laboratory of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 Exploration and Production Research Institute, SINOPEC, Beijing 100083, China 3 China National Offshore Oil Corporation. Tian Jin, Tianjin 300452, China 4 International Exploration Corporation, China Petroleum & Chemical Corporation, Beijing 100081, China
Abstract:We utilize random media to describe small-scale inhomogeneity and self-organized structure in the Earth interior. A block model is adopted to describe the self-organized structure instead of traditional grids in 2-D. Gaussian, exponential, and von Karman autocorrelation functions are used to represent the isotropic and anisotropic self-organized structure. We use numerical methods to perform ray tracing and rectify amplitudes by dynamic ray tracing, furthermore, analyze the influence upon the kinematic and dynamic characteristics of seismic waves. The results indicate that seismic ray trajectories probably generate significant aberrances and the amplitudes of seismic rays may weaken or enlarge at different offsets for the existence of the self-organized structure in the earth interior; from Gaussian to von Karman, amplitudes present more obvious statistic characters.
Keywords:Self-organized structure  Block model  Seismic wave  Ray trajectory  Traveltime  Seismic amplitude
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