eprintid: 9052
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/90/52
datestamp: 2023-11-09 16:21:00
lastmod: 2023-11-09 16:21:00
status_changed: 2023-11-09 16:14:09
type: article
metadata_visibility: show
creators_name: Alashloo, S.Y.M.
creators_name: Ghosh, D.P.
title: Prestack depth imaging in complex structures using VTI fast marching traveltimes
ispublished: pub
keywords: Anisotropy; Differential equations; Geometrical optics; Nonlinear equations; Seismology; Statistical tests; Wave propagation, Eikonal; Fast marching methods; High quality images; Kirchhoff depth migration; Nonlinear approximation; Pre-stack depth migrations; Prestack depth imaging; Vertical transverse isotropies, Seismic prospecting, algorithm; anisotropy; comparative study; finite difference method; imaging method; isotropy; Kirchhoff equation; numerical method; prestack migration; seismic anisotropy; seismic wave; travel time; wave propagation; wave reflection; wave velocity
note: cited By 3
abstract: The presence of sedimentary layers in the Earth's subsurface results in seismic anisotropy, which makes wave velocity dependent on the propagation angle. This phenomenon causes complexities and errors both kinematically and dynamically in seismic imaging. Among these errors are the mispositioning of migrated events and failure to retain energy during dip-moveout. A fundamental and challenging issue in seismic imaging is the computation of seismic wave traveltime from the source to the receiver via the reflection point. A powerful method for determining traveltime is the application of finite difference to solve the eikonal equation. In this study, we employ a fast marching eikonal solver in the isotropic and vertical transverse isotropy (VTI) concepts. We also test the results by using the Kirchhoff depth migration algorithm. Instead of using a linear eikonal equation, which is commonly used in the industry, we consider a nonlinear approximation because it is more realistic and accurate than the former. The Marmousi synthetic data and a real dataset are used for testing purposes. The comparison of isotropic and VTI traveltimes demonstrates a considerable lateral difference among wavefronts. The results of Kirchhoff imaging show that the VTI algorithm generates images with perfect positioning and higher resolution than the isotropic one, specifically in deep areas. Finally, we conclude that our anisotropic approach is stable, fast, and generates high-quality images with accurate details in deep structures. © 2018 ASEG.
date: 2017
publisher: CSIRO
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049209981&doi=10.1071%2fEG17013&partnerID=40&md5=069a560dc2b95c72ec0b54dc8ef0b2c3
id_number: 10.1071/EG17013
full_text_status: none
publication: Exploration Geophysics
volume: 49
number: 4
pagerange: 484-493
refereed: TRUE
issn: 08123985
citation:   Alashloo, S.Y.M. and Ghosh, D.P.  (2017) Prestack depth imaging in complex structures using VTI fast marching traveltimes.  Exploration Geophysics, 49 (4).  pp. 484-493.  ISSN 08123985