High resolution tilted-orthorhombic tomographic inversion to improve velocity modeling and imaging: a case study of its impact on subsalt

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2015High resolution tilted-orthorhombic tomographic inversion to improve velocity modeling and imaging: a case study of its impact on subsaltAuthors: Dhananjay Tiwari*Guy HilburnYang HeYining LiFrancis SherrillZhiqiang GuoDhananjay Tiwari*TGS, Guy HilburnTGS, Yang HeTGS, Yining LiTGS, Francis SherrillTGS, and Zhiqiang GuoTGShttps://doi.org/10.1190/segam2015-5922279.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Several wide-azimuth (WAZ) surveys in the Gulf of Mexico have been acquired to resolve the structure in a complex subsalt region. Long-offset wide-azimuth data can be very beneficial over conventional wide-azimuth acquisition in terms of imaging deeper targets and steeply dipping complex overhangs. Whenever seismic waves encounter layered media, the velocity they experience parallel to the layering is often greater than the velocity perpendicular to the layering. A transversely isotropic (TI) job flow results in improved imaging for these geological regimes. When sediment layering demonstrates considerable dip, tilted-transverse isotropy (TTI) can improve the imaging over verticaltransverse isotropy (VTI), which best describes purely horizontal layers. In the presence of fractures within thin layered media, it has been observed on multiazimuth data that VTI and TTI approaches are not sufficient in resolving conflicting azimuthally varying residual moveout (RMO) on the common-image gathers (CIG's). However, extending the velocity model from TTI to orthorhombic anisotropy can resolve the discrepancy in the moveout observed for a CIG across different azimuths. In this paper we will present a case study demonstrating a method of improving subsalt imaging using image-guided tilted orthorhombic (IG-TORT) tomography and imaging on newly-acquired long-offset wide-azimuth Declaration data. In addition, the data is combined with the existing Justice WAZ data in the Gulf of Mexico. Keywords: anisotropy, high-resolution, depth migration, case history, azimuthPermalink: https://doi.org/10.1190/segam2015-5922279.1FiguresReferencesRelatedDetailsCited byMulti-stencils fast marching method for factored eikonal equations with quadratic anisotropyApplied Mathematics and Computation, Vol. 417The benefit of tilted orthorhombic imaging on a FAZ dataset in the central Gulf of MexicoLi Li, Dhananjay Tiwari, Xinyi Sun, and Zhiqiang Guo10 August 20193D mapping of kinematic attributes in anisotropic mediaYuriy Ivanov and Alexey Stovas26 March 2019 | GEOPHYSICS, Vol. 84, No. 3Unconventional Play Fracture Characterization Through Orthorhombic Depth Model BuildingGuy Hilburn, Amit Pendharkar, William Keller, René Mott, Jorge Peinado, Austin Jumper, and Victor Kriechbaum28 September 2018Salt interpretation for velocity model building using long offset multi-WAZ data: Improving the subsalt image in eastern Mississippi Canyon, Gulf of MexicoDaniel Chaikin, Henrik Roende, and Jason Kegel17 August 2017Fracture detection and reservoir characterization through high-resolution orthorhombic tomography for unconventional playsGuy Hilburn, Amit Pendharkar, William Keller, René Mott, Jorge Peinado, Austin Jumper, and Victor Kriechbaum17 August 2017Anisotropy Complete Session17 August 2017Interpretation I Complete Session17 August 2017High-resolution image-guided tomographic solution for improved imaging in ultrashallow water trench area of Gulf of MexicoSandip Chattopadhyay1 September 2016Seismic Velocity Estimation Complete Session1 September 2016 SEG Technical Program Expanded Abstracts 2015ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2015 Pages: 5634 publication data© 2015 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 19 Aug 2015 CITATION INFORMATION Dhananjay Tiwari*, Guy Hilburn, Yang He, Yining Li, Francis Sherrill, and Zhiqiang Guo, (2015), "High resolution tilted-orthorhombic tomographic inversion to improve velocity modeling and imaging: a case study of its impact on subsalt," SEG Technical Program Expanded Abstracts : 361-365. https://doi.org/10.1190/segam2015-5922279.1 Plain-Language Summary Keywordsanisotropyhigh-resolutiondepth migrationcase historyazimuthPDF DownloadLoading ...