Two-dimensional waveform inversion of multi-component data in acoustic-elastic coupled media

被引:84
作者
Choi, Yunseok [1 ]
Min, Dong-Joo [2 ]
Shin, Changsoo [2 ]
机构
[1] Korea Ocean Res & Dev Inst, Seoul 425600, South Korea
[2] Seoul Natl Univ, Dept Energy Resources Engn, Seoul 151744, South Korea
关键词
D O I
10.1111/j.1365-2478.2008.00735.x
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
In order to account for the effects of elastic wave propagation in marine seismic data, we develop a waveform inversion algorithm for acoustic-elastic media based on a frequency-domain finite-element modelling technique. In our algorithm we minimize residuals using the conjugate gradient method, which back-propagates the errors using reverse time migration without directly computing the partial derivative wavefields. Unlike a purely acoustic or purely elastic inversion algorithm, the Green's function matrix for our acoustic-elastic algorithm is asymmetric. We are nonetheless able to achieve computational efficiency using modern numerical methods. Numerical examples show that our coupled inversion algorithm produces better velocity models than a purely acoustic inversion algorithm in a wide variety of cases, including both single- and multi-component data and low-cut filtered data. We also show that our algorithm performs at least equally well on real field data gathered in the Korean continental shelf.
引用
收藏
页码:863 / 881
页数:19
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