A basic acoustic diffraction experiment for demonstrating the geometrical theory of diffraction
B. Barry Narod, Matthew J. Yedlin, 2016. "A basic acoustic diffraction experiment for demonstrating the geometrical theory of diffraction", Seismic Diffraction, Kamil Klem-Musatov, Henning Hoeber, Michael Pelissier, Tijmen Jan Moser
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An apparatus is described in which acoustic diffractions are generated. Such diffractions are recorded in the field when seismic data is collected over a geological area that has many faults and truncated geological structures. The design of the experiment is considered from the point of view of theoretical feasibility and practical implementation. A computer-controlled transceiver is guided on a traverse perpendicular to a model of a rigid half-plane. At each transceiver location an acoustic pulse is emitted, and the scattered acoustic pulse is recorded. Results of this experiment are presented and analyzed from the perspective of Keller’s geometric theory of diffraction. The predicted asymmetry of the diffraction hyperbola is observed in the model data collected.
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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.