Shallow Water Demultiple (SWD) provides improved results for multiple attenuation where water depths are too shallow to apply SRME directly. In shallow water, the waterbottom reflection needed by SRME to predict multiples may not be recorded with sufficient fidelity.
SWD is data-driven and uses the information from multiples in the data for predicting and removing water layer multiples.
These example displays are from offshore China. The first waterbottom multiple is about 40ms below the primary. Higher order multiples are lower in frequency so wavelets overlap, making difficult attenuation by deconvolution. SWD successfully attenuates both the first order and higher order multiples.
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