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Multi-scale Frequency-domain Elastic Full Waveform Inversion Based on Dual-level Parallelism
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
The complexity of the elastic wavefield increases the nonlinearity of inversion. To some extent, multi-scale inversion decreases the nonlinearity of inversion and prevents it from falling into local extremes. A multi-scale 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 MUMPS 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.