节点文献
各向异性弹性波叠后逆时深度偏移
Poststack Reverse-time Depth Migration for Anisotropic Elastic Waves
【Author】 Zhang Meigen Wang miaoyue Institute of Geology and Geophysics,Chinese Academy of sciences,Beijing,100029,China
【机构】 中国科学院地质与地球物理研究所;
【摘要】 大量数据表明地下岩层的地震各向异性是广泛存在的,然而在常规偏移中,通常视地下介质为各向同性介质,这必然存在一定的误差。本文研究了各向异性弹性波的有限元逆时延拓算法及有关人工吸收边界条件等问题,实现了各向异性弹性波有限元逆时深度偏移系统。两个理论模型的自激自收资料实算表明,该系统能够清晰准确地进行偏移成像。另外,对这两个模型资料的各向同性偏移证实,常规各向同性偏移剖面上存在较大误差。
【Abstract】 A large amount of data show that seismic anisotropy widely exists in underground terranes.But in traditional migration,people usually consider them as isotropic media.So some errors may be caused.The paper studies the reverse-time continuation algorithm and absorbing boundary condition of anisotropic elastic waves,and realizes a poststack reverse-time depth migration system with the finite element method.The migrated results of two models show that the system can produce clear and accurate images of complex geological structures.In addition,the isotropically migrated results of the data of the two anisotropic models confirm that traditional isotropic migration can cause considerable errors.
【Key words】 anisotropic elastic wave; reverse-time depth migration; the finite element method; absorbing boundary condition;
- 【会议录名称】 中国科学院地质与地球物理研究所2002学术论文摘要汇编
- 【会议名称】中国科学院地质与地球物理研究所2002学术年会
- 【会议时间】2002-12-01
- 【会议地点】中国北京
- 【分类号】P315.31
- 【主办单位】中国科学院地质与地球物理研究所(Institute of Geology and Geophysics Chinese Academy of Sciences)