岳玉波^1,2,,
孙鹏飞³,
王德营²,
孙鹏远¹,
郭振波¹,
刘增强¹
1. 东方地球物理公司物探技术研究中心, 河北涿州 072751
2. 山东科技大学山东省沉积成矿作用与沉积矿产重点实验室, 山东青岛 266590
3. 河北工程大学地球科学与工程学院, 河北邯郸 056038

基金项目: 国家科技重大专项（2017ZX05018005-002），国家青年科学基金项目（41604069）和中国科协青年人才托举工程（2016QNRC001）联合资助


详细信息

作者简介: 岳玉波, 男, 1984年生, 山东青州人, 博士, 主要从事地震数据处理方法研究和软件研发.E-mail:geoyyb@163.com

中图分类号: P631

收稿日期:2018-07-05
修回日期:2019-01-02
上线日期:2019-02-15

Gaussian beam Born modeling method for single-scattering waves in elastic isotropic medium

YUE YuBo^1,2,,
SUN PengFei³,
WANG DeYing²,
SUN PengYuan¹,
GUO ZhenBo¹,
LIU ZengQiang¹
1. Research & Development Center, Bureau of Geophysical Prospecting(BGP), China National Petroleum Corporation, Zhuozhou Hebei 072751, China
2. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral, Shandong University of Science and Technology, Qingdao Shandong 266590, China
3. School of Earth Science and Engineering, Hebei University of Engineering, Handan Hebei 056038, China


MSC: P631

--> Received Date: 05 July 2018
Revised Date: 02 January 2019
Available Online: 15 February 2019


摘要
摘要:本文提出了一种弹性波一次散射波场的正演方法——弹性波高斯束Born正演.该方法以线性散射理论为基础，通过Born近似建立起地下散射点处不同波型的反射率同弹性波主分量波场之间的数据映射关系，利用高斯束所包含的走时、振幅和极性信息进行不同波型的局部平面波的合成，进而通过逆倾斜叠加将所合成的局部平面波转化为时空域的多分量地震记录.该方法不但保持了射线类方法高效的优点，还具备了处理多次走时波场的能力，从而保证了复杂构造的波场模拟的精度.文中两个数值模型的应用效果表明，本文所提出的弹性波高斯束Born正演算法具有近似于波动方程有限差分法的波场模拟精度以及高得多的计算效率.
关键词: 一次散射/
高斯束/
Born近似/
弹性各向同性介质

Abstract:We present in this paper a Gaussian beam Born modeling method for simulating single-scattering waves in elastic isotropic medium. Based on the linearized single scattering theory, we first construct the linear data mapping between multi-mode subsurface reflectivities and principal components of elastic waves, then compose multi-mode local plane-waves using the traveltimes, amplitudes and polarizations of Gaussian beams, and finally obtain the simulated multi-component data by transforming the composed local plane-waves to time-space domain. The proposed method not only keeps high efficiency of ray-based methods, but also is capable of dealing with multi-arrivals, and thus achieves accurate wavefield simulation in complex media. Trials on two synthetic models demonstrate that, compared with finite-difference modeling, this method can simulate the first order scattering waves in complex media with similar accuracy and much higher efficiency.
Key words:Single scattering/
Gaussian beam/
Born approximation/
Elastic isotropic medium



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