VTI介质时间域高斯束偏移  

Efficient Gaussian beam method in time domain for anisotropic media

作　　者：吕庆达 黄建平[1] 李振春[1] 吴建文 代福材 Lü Qing-da;HUANG Jian-ping;LI Zhen-chun;WU Jian-wen;DAI Fu-cai(Department of Geophysics at China University of Petroleum,Shandong Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院地球物理系,山东青岛266580

出　　处：《地球物理学进展》2018年第6期2428-2434,共7页Progress in Geophysics

基　　金：泰山学者工程专项经费;国家重点基础研究发展计划(973)子课题(2014CB239006);国家油气重大专项(2016ZX05002-005-07HZ;2016ZX05014-001-008HZ)联合资助

摘　　要：本文基于经典弹性参数表征的各向异性射线追踪系统,结合时间域高斯束偏移降低积分维度的高效运算优势,针对常规算法影响计算效率的问题,实现了适于各向异性介质的时间域高斯束偏移.本文利用各向异性Sub-Sag模型验证各向异性介质时间域高斯束方法的正确性.国际标准各向异性SEG/Hess模型测试结果表明,同传统频率域各向异性介质高斯束偏移方法对比,本文方法在运算速度和适应性方面有很大优势,更适合于在地层各向异性不能忽略的目标探区处理实际地震资料.Owing to the less efficiency of traditional Gaussian beam method for inhomogeneous anisotropic media, we develop the efficient Gaussian beam method in time domain for anisotropic media on the basis of ray tracing system represented by classical elastic parameters. The traditional Gaussian beam migration for anisotropic media are broadly formulated in frequency domain, which need superposed computation of Green function as a Gaussian beam summation at all frequencies. In term of this issue, Gaussian beam migration in time domain can perform well with the modification of the formula by means of slight transformation, which can transform the triple integral in the frequency domain into the double integral of the horizontal slowness and the vertical slowness in the time domain, yield to enhancing the computational efficiency on the basis of maintaining the imaging accuracy. Numerical experiment of the SEG/Hess model confirm the feasibility and computational efficiency of Gaussian beam method in time domain for anisotropic media. This superiority is more suitable to deal with the real seismic datasets in the target exploration area where the anisotropy cannot be ignored.

关 键 词：各向异性 时间域 高斯束偏移 射线追踪 

分 类 号：P631[天文地球—地质矿产勘探]