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Seismic Full Waveform Inversion With Shot-Encoding Using an Improved L-BFGS Method
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DOI：10.1109/TGRS.2024.3461961.png)
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摘要
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In seismic full waveform inversion (FWI), the shot-encoding technique can reduce computational costs. It randomly encodes all individual shot gathers and combines them into a super shot gather. This allows the number of wavefield simulations to be reduced. To mitigate crosstalk noise caused by interference between different shots, shot-encoded FWI requires the shot encoding to be sufficiently random. However, this may destabilize the standard limited memory BFGS (L-BFGS) algorithm and lead to instability and nonconvergence in the interactive inversion of FWI. In this article, we propose the improved L-BFSG (iL-BFGS) method, which uses the formula of the outer product of the Hessian matrix to calculate the gradient difference for the recursive L-BFSG computation. We also redesigned the workflow for shot-encoded FWI to increase the randomness within the shot encoding. We have shown that the proposed method improves the image quality of shot-encoded FWI, especially for intermediate and deep formations, accelerates the convergence of iterative inversion, and improves the ability of FWI to suppress crosstalk effects.
Keyword:
Encoding
Vectors
Crosstalk
Linear programming
Computational efficiency
Mathematical models
Polar codes
Improved L-BFGS (iL-BFGS) algorithm
outer product formula of Hessian matrix
seismic full waveform inversion (FWI)
shot encoding
期刊
IF:
8.6
论文数:
2.1W
被引数:
10.7W
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