In dual-sensor data acquisition, the downgoing reflections from the sea surface may be regarded as additional source wavefields and help reduce the footprint effect. While efforts are made to suppress multiples in conventional acquisition, surface multiples will be used here as signal, to better image shallow targets by reducing the acquisition footprint effects. We perform a high-resolution depth imaging of shallow targets using separated upgoing and downgoing wavefields obtained from collocated hydrophone and velocity sensor recordings of a dual-sensor towed streamer system. The complete downgoing component is considered as source wavefield and the complete upgoing component as a receiver wavefield in a one-way wave equation imaging approach. The image is compared with a conventional one-way wave equation image obtained from solely hydrophone measurement (total pressure wavefield). Based on synthetic data we perform a 4D repeatability study to demonstrate the sea-surface effect on the obtained depth image for conventional and dual-sensor streamer data.
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