Frequency-domain elastic full-waveform multiscale inversion method based on dual-level parallelism
Li Yuan-Yuan1, Li Zhen-Chun1, Zhang Kai1, and Zhang Xuan2
1. School of Geosciences, China University of Petroleum, Qingdao 266580, China.
2. School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China.
Abstract The complexity of an elastic wavefield increases the nonlinearity of inversion. To some extent, multiscale inversion decreases the nonlinearity of inversion and prevents it from falling into local extremes. A multiscale strategy based on the simultaneous use of frequency groups and layer stripping method based on damped wave field improves the stability of inversion. A dual-level parallel algorithm is then used to decrease the computational cost and improve practicability. The seismic wave modeling of a single frequency and inversion in a frequency group are computed in parallel by multiple nodes based on multifrontal massively parallel sparse direct solver and MPI. Numerical tests using an overthrust model show that the proposed inversion algorithm can effectively improve the stability and accuracy of inversion by selecting the appropriate inversion frequency and damping factor in low-frequency seismic data.
This work was supported by the Natural Science Foundation of China (No. 41374122).
Cite this article:
Li Yuan-Yuan,Li Zhen-Chun,Zhang Kai et al. Frequency-domain elastic full-waveform multiscale inversion method based on dual-level parallelism[J]. APPLIED GEOPHYSICS, 2015, 12(4): 545-554.
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2015, Vol. 12 
