Beamlet migration provides robust imaging in the presence of strong velocity contrasts by combining local perturbation theory with wavelet transforms. Source and receiver wavefields are decomposed into beamlets during the wavefield extrapolation. Each beamlet propagates with a local reference velocity in which the local velocity perturbation is small, resulting in accurate and efficient wave propagation. It simultaneously extracts local information in both space and angle. Such information can be further applied to the computation of imaging amplitude corrections using directional illumination in the local angle domain. Synthetic examples show the local angle imaging properties of beamlets and the improved amplitude balance of the depth image after acquisition aperture correction.

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