Acoustic 2D full waveform inversion to solve gas cloud challenges

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Published: Sep 30, 2015
DOI: https://doi.org/10.4401/ag-6720
Keywords:
Full waveform inversion, Gas cloud

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Srichand Prajapati
Centre for Seismic Imaging, Universiti Teknologi PETRONAS, Seri Iskandar, Perak,
Deva Ghosh
Centre for Seismic Imaging, Universiti Teknologi PETRONAS, Seri Iskandar, Perak,

Abstract

The existing conventional inversion algorithm does not provide satisfactory results due to the complexity of propagated wavefield though the gas cloud. Acoustic full waveform inversion has been developed and applied to a realistic synthetic offshore shallow gas cloud feature with Student-t approach, with and without simultaneous sources encoding. As a modeling operator, we implemented the grid based finite-difference method in frequency domain using second order elastic wave equation. Jacobin operator and its adjoint provide a necessary platform for solving full waveform inversion problem in a reduced Hessian matrix. We invert gas cloud model in 5 frequency band selected from 1 to 12 Hz, each band contains 3 frequencies. The inversion results are highly sensitive to the misfit. The model allows better convergence and recovery of amplitude losses. This approach gives better resolution then the existing least-squares approach. In this paper, we implement the full waveform inversion for low frequency model with minimum number of iteration providing a better resolution of inversion results.

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How to Cite
Prajapati, S. and Ghosh, D. (2015) “Acoustic 2D full waveform inversion to solve gas cloud challenges”, Annals of Geophysics, 58(4), p. S0436. doi: 10.4401/ag-6720.
Issue
Vol. 58 No. 4 (2015)
Section
Seismology

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