Tomographic velocity model building of near surface with reversed‐velocity interfaces

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2010Tomographic velocity model building of near surface with reversed‐velocity interfacesAuthors: Hui LiuHua‐wei ZhouWenge LiuZhihui ZouPeiming LiHui LiuTexas Tech UniversitySearch for more papers by this author, Hua‐wei ZhouTexas Tech UniversitySearch for more papers by this author, Wenge LiuTexas Tech UniversitySearch for more papers by this author, Zhihui ZouTexas Tech UniversitySearch for more papers by this author, and Peiming LiBGP Inc., CNPCSearch for more papers by this authorhttps://doi.org/10.1190/1.3513785 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract First‐arrival tomography is a popular way to build the near‐surface velocity models for oil and gas exploration, mining, geo‐engineering, and environmental studies. However, the presence of reversed‐velocity interfaces (RVI's), across which the overlying velocity is higher than the underlying velocity, may corrupt the tomographic solutions. This is because that most first‐arrival raypaths will not traverse along any RVI such as the top of a low‐velocity zone. Here we examine the impact of the RVI's on tomographic velocity model building of the near surface using first‐arrival tomography and a near‐surface velocity model from Öz Yilmaz. Our examination confirms the severe impact of the RVI's on first‐arrival tomography. Interestingly, good near‐surface velocity models can still be established using a multi‐scale deformable layer tomography (DLT). Comparing with the results from a commercial grid‐based tomography, the DLT delivers much better near‐surface statics solutions and less error in the images of deep reflectors.Permalink: https://doi.org/10.1190/1.3513785FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2010ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2010 Pages: 4453 publication data© 2010 Copyright © 2010 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 21 Oct 2010 CITATION INFORMATION Hui Liu, Hua‐wei Zhou, Wenge Liu, Zhihui Zou, and Peiming Li, (2010), "Tomographic velocity model building of near surface with reversed‐velocity interfaces," SEG Technical Program Expanded Abstracts : 4364-4368. https://doi.org/10.1190/1.3513785 Plain-Language Summary PDF DownloadLoading ...