Acoustic pulse diffraction by step discontinuities on a plane
Q. Zhang, E. V. Jull, M. J. Yedlin, 2016. "Acoustic pulse diffraction by step discontinuities on a plane", Seismic Diffraction, Kamil Klem-Musatov, Henning Hoeber, Michael Pelissier, Tijmen Jan Moser
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High-frequency acoustic pulse diffraction of a point source by step discontinuities in a hard plane boundary is analyzed with the uniform geometrical theory of diffraction. Proper treatment of source and receiver locations at shadow boundaries provides a more complete analysis than before for the 90-degree step as evidenced by frequency-domain numerical values. Time-domain results for the 90-degree step, for a 30-degree inclined step, and for two offset half-planes illustrate the significance of corner reflection and double diffraction missing from earlier numerical models based on Kirchhoff diffraction theory. Advantages in accuracy, computational efficiency, and scope of application of geometrical over Kirchhoff diffraction theory are indicated.
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The use of diffraction imaging to complement the seismic reflection method is rapidly gaining momentum in the oil and gas industry. As the industry moves toward exploiting smaller and more complex conventional reservoirs and extensive new unconventional resource plays, the application of the seismic diffraction method to image sub-wavelength features such as small-scale faults, fractures and stratigraphic pinchouts is expected to increase dramatically over the next few years. “Seismic Diffraction” covers seismic diffraction theory, modeling, observation, and imaging. Papers and discussion include an overview of seismic diffractions, including classic papers which introduced the potential of diffraction phenomena in seismic processing; papers on the forward modeling of seismic diffractions, with an emphasis on the theoretical principles; papers which describe techniques for diffraction mathematical modeling as well as laboratory experiments for the physical modeling of diffractions; key papers dealing with the observation of seismic diffractions, in near-surface-, reservoir-, as well as crustal studies; and key papers on diffraction imaging.