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primary topic: Acoustic 2D full waveform inversion to solve gas cloud challenges

Acoustic 2D full waveform inversion to solve gas cloud challenges
type: AcademicArticle
type: Article
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 cloudfeature 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 solvingfull 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. © 2015 by the Istituto Nazionale di Geofisica e Vulcanologia. All rights reserved.
date: 2015
volume: 58
issue: 4
is part of: Annals of Geophysics
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ArticleEPrint
is part of: repository

Editrice Compositori s.r.l.
type: Organization

Annals of Geophysics
type: Collection
issn: 15935213

S. Prajapati
type: Person
given name: S.
family name: Prajapati

D. Ghosh
type: Person
given name: D.
family name: Ghosh

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primary topic: Acoustic 2D full waveform inversion to solve gas cloud challenges