Broadside wavefields in horizontal helically-wound optical fiber and hydrophone streamer

In this work, we investigate the wavefields and the broadside response of a helical distributed acoustic sensor cable co-located with a hydrophone streamer in a shallow horizontal borehole. We discuss dual-wavefield separation results for selected optical-cable signals recorded with dense receiver spacing. Moreover, we interpret the phase and amplitude differences observed in the HWC and streamer data using sources at different azimuth. The analysis shows how the frequency response for the DAS signal with respect to the corresponding streamer signal changes with azimuth.