Addressing viscous effects in acoustic full-waveform inversion
File(s)
Published version
Author(s)
Agudo, ÓC
Vieira Da Silva, N
Warner, M
Kalinicheva, T
Morgan, J
Type
Journal Article
Abstract
In conventional full-waveform inversion (FWI), viscous effects are typically neglected, and this is likely to adversely affect the recovery of P-wave velocity. We have developed a strategy to mitigate viscous effects based on the use of matching filters with the aim of improving the performance of acoustic FWI. The approach requires an approximate estimate of the intrinsic attenuation model, and it is one to three times more expensive than conventional acoustic FWI. First, we perform 2D synthetic tests to study the impact of viscoacoustic effects on the recorded wavefield and analyze how that affects the recovered velocity models after acoustic FWI. Then, we apply the current method on the generated data and determine that it mitigates viscous effects successfully even in the presence of noise. We find that having an approximate estimate for intrinsic attenuation, even when these effects are strong, leads to improvements in resolution and a more accurate recovery of the P-wave velocity. Then, we implement and develop our method on a 2D field data set using Gabor transforms to obtain an approximate intrinsic attenuation model and inversion frequencies of up to 24 Hz. The analysis of the results indicates that there is an improvement in terms of resolution and continuity of the layers on the recovered P-wave velocity model, leading to an improved flattening of gathers and a closer match of the inverted velocity model with the migrated seismic data.
Date Issued
2018-11-01
Date Acceptance
2018-07-23
Citation
Geophysics, 2018, 83 (6), pp.R611-R628
ISSN
0016-8033
Publisher
Society of Exploration Geophysicists
Start Page
R611
End Page
R628
Journal / Book Title
Geophysics
Volume
83
Issue
6
Copyright Statement
© 2018 The Authors. Published by the Society of Exploration Geophysicists. All article content, except where otherwise noted (including republished material), is licensed under a Creative Commons Attribution 4.0 Unported License (CC BY). See http://creativecommons.org/licenses/by/4.0/.
Sponsor
BG International Limited
Sub Salt Solutions
Grant Number
4100005341
EACPR_P73721
Subjects
0404 Geophysics
Geochemistry & Geophysics
Publication Status
Published
Date Publish Online
2018-10-01