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    Wave-equation Radon tomography for early arrivals

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    Type
    Conference Paper
    Authors
    Ibrahim, Amr
    Schuster, Gerard T. cc
    Hanafy, Sherif M.
    KAUST Department
    Center for Subsurface Imaging and Fluid Modeling
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OCRF-2014-CRG3-2300
    Date
    2018-08-27
    Online Publication Date
    2018-08-27
    Print Publication Date
    2018-08-27
    Permanent link to this record
    http://hdl.handle.net/10754/631206
    
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    Abstract
    We present the theory of wave-equation Radon tomography (WRT) where the slopes and zero-intercept time of early arrivals in the τ−p domain are inverted for the subsurface velocity structure. The early arrivals are windowed in a shot gather, but they are still too wiggly to avoid local minima with a full waveform inversion (FWI) method. To reduce their complexity, a local linear Radon τ−p transform is applied to the events to focus them into few points. These points, which identify the slopes and zero-intercept time of the early arrivals, are picked to give the slowness coordinate pobs i at the zero-intercept time τ i . The misfit function ε=∑ i=1 P (p i −p i obs )2+∑ i=1 P (τ i −τ i obs )2 is computed and a gradient optimization method is used to find the optimal velocity model that minimizes e. Results with synthetic data and field data show that WRT can accurately reconstruct the nearsurface P-wave velocity model and converges faster than other wave-equation methods.
    Citation
    Ibrahim A, Schuster GT, Hanafy SM (2018) Wave-equation Radon tomography for early arrivals. SEG Technical Program Expanded Abstracts 2018. Available: http://dx.doi.org/10.1190/segam2018-2998360.1.
    Sponsors
    We thank the sponsors for supporting the Consortium of Subsurface Imaging and Fluid Modeling (CSIM). We also thank KAUST for providing funding by the CRG grant OCRF-2014-CRG3-2300. For computer time, this research used the resources of the Supercomputing Laboratory at KAUST.
    Publisher
    Society of Exploration Geophysicists
    Journal
    SEG Technical Program Expanded Abstracts 2018
    Conference/Event name
    88th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2018
    DOI
    10.1190/segam2018-2998360.1
    Additional Links
    https://library.seg.org/doi/10.1190/segam2018-2998360.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/segam2018-2998360.1
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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