3D ultra shallow seismic imaging of buried pipe using dense receiver array: Practical and theoretical considerations
Ran Bachrach, Moshe Reshef, 2016. "3D ultra shallow seismic imaging of buried pipe using dense receiver array: Practical and theoretical considerations", Seismic Diffraction, Kamil Klem-Musatov, Henning Hoeber, Michael Pelissier, Tijmen Jan Moser
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Direct 3D imaging of a 6” pipe, buried at a depth of 1.5 m, using portable dense receiver array shows that small objects associated with large impedance contrast can be precisely imaged. Detailed velocity analysis applied to backscattered wavefield from small buried objects provides resolution of less than 10 m/s. Comparison of backscattered wavefield observations to analytical solutions show a generally good match. Theoretical calculations also show that the objectcan be detected with wavelengths much larger than its size due to the large contrast associated with its hollow shape. Dense spatial sampling is needed to capture the energy emitted from the scattering object and successfully focus it by diffraction imaging. Portable dense receiver array can provide a cost-effective solution forsuchtasks.
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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.