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Exploiting Phase Control Of A Marine Seismic Vibrator For High-Multiplicity Simultaneous Source Acquisition
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Marine Acquisition Workshop 2018, Aug 2018, cp-560-00020
- ISBN: 978-94-6282-259-7
Abstract
A high-fidelity marine seismic vibrator would allow control of the phase of the seismic source wavefield. Phase control can be used to encode high-multiplicity simultaneous-source data. By changing the phase of the source wavefield from shot-to-shot following a prescribed sequence of phase delays, energy from selected sources can be coherently shifted into different parts of the frequency-wavenumber spectrum in the common-receiver domain. Results of this approach are demonstrated using realistic synthetic examples. A comparison with the more conventional time-dithered air-gun approach indicates that the phase sequencing approach gives an improved result, with a lower separation error. The phase sequencing approach cannot be used as effectively with air guns because they only allow changes to the overall time delay of the source.