• Login
    View Item 
    •   Home
    • Research
    • Articles
    • View Item
    •   Home
    • Research
    • Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of KAUSTCommunitiesIssue DateSubmit DateThis CollectionIssue DateSubmit Date

    My Account

    Login

    Quick Links

    Open Access PolicyORCID LibguideTheses and Dissertations LibguideSubmit an Item

    Statistics

    Display statistics

    Least-squares reverse time migration with local Radon-based preconditioning

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    geo2016-01172E1.pdf
    Size:
    13.08Mb
    Format:
    PDF
    Description:
    Main article
    Download
    Type
    Article
    Authors
    Dutta, Gaurav cc
    Giboli, Matteo
    Agut, Cyril
    Williamson, Paul
    Schuster, Gerard T. cc
    KAUST Department
    Center for Subsurface Imaging and Fluid Modeling
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-03-08
    Online Publication Date
    2017-03-08
    Print Publication Date
    2017-03
    Permanent link to this record
    http://hdl.handle.net/10754/623005
    
    Metadata
    Show full item record
    Abstract
    Least-squares migration (LSM) can produce images with better balanced amplitudes and fewer artifacts than standard migration. The conventional objective function used for LSM minimizes the L2-norm of the data residual between the predicted and the observed data. However, for field-data applications in which the recorded data are noisy and undersampled, the conventional formulation of LSM fails to provide the desired uplift in the quality of the inverted image. We have developed a leastsquares reverse time migration (LSRTM) method using local Radon-based preconditioning to overcome the low signal-tonoise ratio (S/N) problem of noisy or severely undersampled data. A high-resolution local Radon transform of the reflectivity is used, and sparseness constraints are imposed on the inverted reflectivity in the local Radon domain. The sparseness constraint is that the inverted reflectivity is sparse in the Radon domain and each location of the subsurface is represented by a limited number of geologic dips. The forward and the inverse mapping of the reflectivity to the local Radon domain and vice versa is done through 3D Fourier-based discrete Radon transform operators. The weights for the preconditioning are chosen to be varying locally based on the relative amplitudes of the local dips or assigned using quantile measures. Numerical tests on synthetic and field data validate the effectiveness of our approach in producing images with good S/N and fewer aliasing artifacts when compared with standard RTM or standard LSRTM.
    Citation
    Dutta G, Giboli M, Agut C, Williamson P, Schuster GT (2017) Least-squares reverse time migration with local Radon-based preconditioning. GEOPHYSICS 82: S75–S84. Available: http://dx.doi.org/10.1190/GEO2016-0117.1.
    Sponsors
    G. Dutta would like to thank King Abdullah University of Science and Technology (KAUST) for funding his graduate studies. The authors are grateful to TOTAL E&P France for permission to publish this work. We also thank the associate editor K. Innanen and the three anonymous reviewers for their helpful comments and suggestions. The plots for this paper have been prepared using the Madagascar open-source software package.
    Publisher
    Society of Exploration Geophysicists
    Journal
    GEOPHYSICS
    DOI
    10.1190/GEO2016-0117.1
    Additional Links
    http://library.seg.org/doi/abs/10.1190/geo2016-0117.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/GEO2016-0117.1
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

    entitlement

     
    DSpace software copyright © 2002-2022  DuraSpace
    Quick Guide | Contact Us | KAUST University Library
    Open Repository is a service hosted by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items. For anonymous users the allowed maximum amount is 50 search results.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.