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    Regularized full-waveform inversion for large 3-D salt bodies

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    salt_seg.pdf
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    Accepted manuscript
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    Type
    Conference Paper
    Authors
    Kalita, Mahesh cc
    Ghazali, Ahmad Riza
    Xin, Kefeng
    Dzulkefli, Farah Syazana
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2019-08-10
    Permanent link to this record
    http://hdl.handle.net/10754/661904
    
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    Abstract
    Our objective is to invert for large 3-D salt models using full-waveform inversion (FWI), especially in the absence of good starting models and low frequencies in the seismic data. This objective incurs a couple of critical issues. First, the presence of salt geobodies aggravates the non-linearity and ill-posedness of FWI. Second, a 3-D FWI is computationally very expensive, even more so when the initial model is in hindsight very far from the target one. To mitigate the ill-posedness, we propose to utilize model regularization in the FWI framework to promote a limited variation in the inverted model followed by a post-processing step of FWI to penalize sharp velocity drops in the model. Next, to reduce the computational overburden, we propose to utilize a multi-excitation assumption (MExA) of source wavefields in the FWI gradient calculation step. This assumption, due to the simplistic nature of the source wavelet, approximates the source wavefield wiggle at a gridpoint by a series of its energetic arrivals. As a result, the gradient evaluation using MExA requires us neither to store the entire source wavefield nor to include an additional extrapolation step to propagate the source wavefield from its temporary storage at the boundary. The versatility of the proposed method is demonstrated on a synthetic dataset of the modified SEG/EAGE salt model in which the lowest available frequency is 3 Hz.
    Citation
    Kalita, M., Ghazali, A. R., Xin, K., Dzulkefli, F. S., & Alkhalifah, T. (2019). Regularized full-waveform inversion for large 3-D salt bodies. SEG Technical Program Expanded Abstracts 2019. doi:10.1190/segam2019-3215296.1
    Sponsors
    We would like to thank KAUST and Petroliam Nasional Berhad (Petronas) for their support, all the members of Seismic Wave Analysis Group for fruitful discussions, the Supercomputer laboratory and IT Research Computing for computer time, the Core Labs of KAUST for their facilities.
    Publisher
    Society of Exploration Geophysicists
    Conference/Event name
    Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
    DOI
    10.1190/segam2019-3215296.1
    Additional Links
    https://library.seg.org/doi/10.1190/segam2019-3215296.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/segam2019-3215296.1
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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