Abstract
We propose an efficient split‐step local plane wave decomposition method to obtain the local‐angle domain (LAD) illumination in the frequency domain for full‐wave propagators. For 2D model, firstly we decompose the full waves along vertical direction using 1D decomposition to separate the downgoing and upgoing waves; then apply 1D decomposition along horizontal direction to the separated downgoing or upgoing waves to get corresponding LAD illuminations. The proposed method can obtain the illumination for turning waves, refracted and reflected waves. It can be extended to 3D case with 1D decomposition along vertical direction and 2D decomposition along horizontal coordinates. We exemplify the method with directional illumination (DI) and acquisition dip response (ADR) analysis in 2D SEG/EAGE salt model. We compare the results with those from more expensive 2D local slant stack (LSS) decomposition method. The results from the proposed method are almost the same as those by the 2D decomposition method. Further we investigate the influence of multiples on the illumination strength.
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