各向异性黏弹性介质伪谱法波场模拟

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英文篇名：Wavefield forward modeling with the pseudo-spectral method in viscoelastic and azimuthally anisotropic media 中文刊名：物理学报 英文刊名：Acta Physica Sinica 作者：杜启振 英文作者：Du Qi-Zhen (School of Earth Resources and Information ; University of Petroleum (East China) ; Dongying 257061 ; China) (Key Laboratory of Geophysical Prospecting of China National Petroleum Corporation ; University of Petroleum ; Beijing 102249 ; China) (Postdoctoral Scientific Research Workstation Branch ; Geophysical Research Institute of Shengli Oilfield Company Ltd. ; Dongying\ 257022 ; China) 中文关键词：黏弹性 ; 各向异性 ; 伪谱法 英文关键词：viscoelasticity ; anisotropy ; pseudo-spectral method 出版日期：2004-12-12 机构：石油大学(华东)地球资源与信息学院 东营257061,石油大学中国石油天然气集团公司物探重点实验室,北京102249,胜利油田有限公司物探研究院博士后科研工作分站,东营257022 年：2004 期：12 出版单位：物理学报

摘要

当地震信号通过复杂地球介质时 ,地层除了表现为各向异性 ,还表现为内在的黏弹性特征 因此 ,为准确描述地震波在地球介质中的传播特征 ,理想的地球介质模型应该能够模拟岩石的各向异性特征和衰减特征 .给出了各向异性黏弹性介质模型的波动方程 ,推导了伪谱法波场正演模拟的递推公式 ,并利用伪谱法实现了地震波波场数值模拟 .表明了该介质模型中地震波场特征与各向异性主轴方位和介质的黏滞性参数之间的关系
When a seismic signal propagates through a realistic medium in the Earth,in addition to anisotropy,the layers may show intrinsic viscoelastic behavior. Thus,an accurate description of wave propagation requires a rheology that accounts for the anisotropic and viscoelastic behavior of rocks. On this basis,the pseudo-spectral recursive formulae of viscoelastic and azimuthally anisotropic media are derived. Wavefield forward modeling with the pseudo-spectral method was carried out in viscoelastic and azimuthally anisotropic media. The numerical results from the pseudo-spectral method clearly show that seismic wavefield is closely related with the viscoelasticity and the azimuth of the principal axes of anisotropy.

引文

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