3D Laplace-domain waveform inversion using a low-frequency time-domain modeling algorithm

被引:13
作者
Ha, Wansoo [1 ]
Kang, Seung-Goo [2 ]
Shin, Changsoo [3 ]
机构
[1] Pukyong Natl Univ, Dept Energy Resources Engn, Busan 608737, South Korea
[2] Korea Polar Res Inst, Div Polar Earth Syst Sci, Inchon, South Korea
[3] Seoul Natl Univ, Dept Energy Resources Engn, Seoul, South Korea
关键词
ABSORBING BOUNDARY-CONDITIONS; ITERATIVE SOLVER; ENCODED SOURCES; FOURIER-DOMAIN; SEISMIC DATA; TRANSFORM; EQUATIONS; FIELD;
D O I
10.1190/GEO2013-0332.1
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
We have developed a Laplace-domain full-waveform inversion technique based on a time-domain finite-difference modeling algorithm for efficient 3D inversions. Theoretically, the Laplace-domain Green's function multiplied by a constant can be obtained regardless of the frequency content in the time-domain source wavelet. Therefore, we can use low-frequency sources and large grids for efficient modeling in the time domain. We Laplace-transform time-domain seismograms to the Laplace domain and calculate the residuals in the Laplace domain. Then, we back-propagate the Laplace-domain residuals in the time domain using a predefined time-domain source wavelet with the amplitude of the residuals. The back-propagated wavefields are transformed to the Laplace domain again to update the velocity model. The inversion results are long-wavelength velocity models on large grids similar to those obtained by the original approach based on Laplace-domain modeling. Inversion examples with 2D Gulf of Mexico field data revealed that the method yielded long-wavelength velocity models comparable with the results of the original Laplace-domain inversion methods. A 3D SEG/EAGE salt model example revealed that the 3D Laplace-domain inversion based on time-domain modeling method can be more efficient than the inversion based on Laplace-domain modeling using an iterative linear system solver.
引用
收藏
页码:R1 / R13
页数:13
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