Diffraction imaging of high-resolution 3D P-cable data from the Gulf of Mexico using azimuthal plane-wave destruction
Dmitrii Merzlikin, Timothy A. Meckel, Sergey Fomel and Yanadet Sripanich
Journal name: First Break
Issue: Vol 35, No 2, February 2017 pp. 35 - 41
Info: Article, PDF ( 1.11Mb )
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Edge diffractions are responses from such geologic discontinuities as depositional channels, faults, fracture swarms, etc. We apply diffraction imaging to a high-resolution 3D (P-cable) dataset acquired on the inner shelf, Gulf of Mexico. We generate and interpret azimuthal plane-wave destruction diffraction images and focus on two different geological features observed in the diffracted wave-field: (1) faults, and (2) meandering channels with high and low sinuosity. The crucial step in diffraction imaging workflows is the diffraction/reflection separation procedure with the goal of attenuating reflection energy that typically masks weaker diffraction energy. Plane-wave destruction filters successfully serve this purpose. In 3D these filters operate in two directions – along inline or crossline directions. We apply an extended azimuthal plane-wave destruction imaging workflow, which accounts for various orientations of edge diffractions and allows for their orientation determination. We utilize the azimuth information to identify subtle diffractivity zones with orientations similar to the one of corresponding major faults. We show that diffraction images allow for finer discontinuities’ delineation as compared to conventional reflection images.