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    Micro-seismic imaging using a source function independent full waveform inversion method

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    Type
    Article
    Authors
    Wang, Hanchen cc
    Alkhalifah, Tariq Ali cc
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2018-03-26
    Online Publication Date
    2018-03-26
    Print Publication Date
    2018-07-01
    Permanent link to this record
    http://hdl.handle.net/10754/627425
    
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    Abstract
    At the heart of micro-seismic event measurements is the task to estimate the location of the source micro-seismic events, as well as their ignition times. The accuracy of locating the sources is highly dependent on the velocity model. On the other hand, the conventional micro-seismic source locating methods require, in many cases manual picking of traveltime arrivals, which do not only lead to manual effort and human interaction, but also prone to errors. Using full waveform inversion (FWI) to locate and image micro-seismic events allows for an automatic process (free of picking) that utilizes the full wavefield. However, full waveform inversion of micro-seismic events faces incredible nonlinearity due to the unknown source locations (space) and functions (time). We developed a source function independent full waveform inversion of micro-seismic events to invert for the source image, source function and the velocity model. It is based on convolving reference traces with these observed and modeled to mitigate the effect of an unknown source ignition time. The adjoint-state method is used to derive the gradient for the source image, source function and velocity updates. The extended image for the source wavelet in Z axis is extracted to check the accuracy of the inverted source image and velocity model. Also, angle gathers is calculated to assess the quality of the long wavelength component of the velocity model. By inverting for the source image, source wavelet and the velocity model simultaneously, the proposed method produces good estimates of the source location, ignition time and the background velocity for synthetic examples used here, like those corresponding to the Marmousi model and the SEG/EAGE overthrust model.
    Citation
    Wang H, Alkhalifah T (2018) Micro-seismic imaging using a source function independent full waveform inversion method. Geophysical Journal International. Available: http://dx.doi.org/10.1093/gji/ggy121.
    Sponsors
    We thank KAUST for sponsoring this research. We also thank to the team of SWAG for their help during the research.
    Publisher
    Oxford University Press (OUP)
    Journal
    Geophysical Journal International
    DOI
    10.1093/gji/ggy121
    Additional Links
    https://academic.oup.com/gji/advance-article/doi/10.1093/gji/ggy121/4953756
    ae974a485f413a2113503eed53cd6c53
    10.1093/gji/ggy121
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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