摘要
基于多分量地震资料的深度偏移能够更加充分的利用地震记录上的多波信息,而且地下介质中广泛的存在各向异性,本文提出了一种有效的适用于二维各向异性介质的多波高斯束叠前深度偏移方法.首先基于各向异性射线追踪理论,导出了适用于二维各向异性介质的射线追踪方程组,实现了二维各向异性介质中P波和S波的射线追踪.其次将各向异性射线追踪理论引入到高斯束偏移方法中,分别给出适用于二维各向异性介质的PP波和PS波高斯束叠前深度偏移成像方法.本文成像方法充分考虑各向异性因素对地震波场的影响,能够对存在各向异性介质的地下构造准确偏移归位.通过对不同各向异性介质的数值模型进行PP波和PS波高斯束叠前深度偏移成像测试分析表明,本文方法是一种准确有效的适应于各向异性介质条件的多波叠前深度偏移成像算法.
As the depth migration of multi-component seismic data can more fully use multiwave information in seismic records and seismic anisotropy widely exists in the subsurface media, an effective multiwave Gaussian beam prestack depth migration method for 2D anisotropic media is presented in this paper. Based on the anisotropic ray tracing theory,we first derive the 2D anisotropic ray tracing equations and realize the P-and S-waves ray tracing in 2D anisotropic media. Then we apply anisotropic ray tracing system to Gaussian beam migration method and present 2D anisotropic Gaussian beam prestack depth migration algorithms of PP and PS waves,respectively. The method takes the influence of anisotropy on seismic waves into account,and can obtain accurate seismic images of subsurface structures in anisotropic media. Tests of PP and PS waves Gaussian beam prestack depth migration for different anisotropic numerical examples show that the method introduced above is an accurate and efficient anisotropic prestack depth migration method for multiwave seismic data.
出处
《地球物理学进展》
CSCD
北大核心
2017年第3期1130-1139,共10页
Progress in Geophysics
基金
中国地质科学院地质研究所基本科研业务费项目(J1620)
中国博士后科学基金项目(2016M591250)联合资助
关键词
多波
各向异性
射线追踪
高斯束叠前深度偏移
multiwave
anisotropy
ray tracing
Gaussian beam prestack depth migration
