Abstract
Common-image gathers indexed by opening angle and azimuth at imaging point in 3D situation are key input for amplitude-variation-to-angle (AVA) and velocity analysis by tomography. The Gaussian beam depth migration (GBM), propagating a beam along each ray and summing the contributions from all the individual beams to produce the wavefield, can overcome the multipath problem, image steep reflectors and more importantly provide a convenient and efficient strategy to extract azimuth-opening angle domain common-image gathers (ADCIGs) in 3D seismic imaging. We present a method for computing azimuth and opening angle at imaging point to output 3D ADCIGs by computing the Gaussian beams wavefield direction vectors, which are solved analytically from Gaussian beam function. Numerical tests and field data application demonstrate the azimuth-opening angle domain imaging method in 3D Gaussian beam depth migration is effective.
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