Increasing efficiency with innovative technologies in OBN signal data processing – Case study from the Gulf of Mexico deepwater environment

Distributed Acoustic Sensing (DAS) using fiber optics cables as sensors has become a standard measurement technique in many industrialized settings. Geophysical applications have been mainly commercialized in the borehole environment. When deployed on the seabed, horizontal analysis of DAS data poses new challenges due to the particularity of the receiver response and characteristics of DAS data. Recent acquisition of a 2D towed-streamer (TS) survey following the path of a communication cable (installed in 1998), which was interrogated continuously throughout the TS acquisition, enabled us to jointly analyze seabed DAS (SB-DAS) and conventional TS data recorded using modern hydrophone streamer from acquisition, through the different processing stages up to a migrated image. The SB-DAS recording from the old communication cable enabled us to generate excellent P-wave and converted wave (PS) images of the subsurface. However, care is needed when recovering the high spatial frequencies damped by the nature of DAS measurements (which may depend also on the hardware used) and demonstrate the recovery of the signal within the data processing sequence. Our focus is on the challenges associated with data processing of entrenched marine cables. Given a simple TS processing sequence as a reference we demonstrate an equivalent recommended practice for signal analysis, data processing and imaging of SB-DAS data.

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New wiggles from old cables: Data processing and imaging considerations

Bachrach

Ramani

Kanrar

et al. 2023

GEOPHYSICS

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Increasing efficiency with innovative technologies in OBN signal data processing – Case study from the Gulf of Mexico deepwater environment

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New wiggles from old cables: Data processing and imaging considerations

New wiggles from old cables: Data processing and imaging considerations

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