A processing for ocean-bottom multicomponent data with seismic interferometry: a case study of southern offshore in Korea

Marine seismic surveys are widely used to explore oil and gas resources and monitor CO2 storage. In particular, ocean-bottom seismic surveys allow the acquisition of high-quality data without the influence of the water-layer environment. However, ocean-bottom seismic surveys are more expensive than streamer surveys and P-wave survey data exhibit free-surface multiples, which are persistent problems. PZ summation can be applied to process multicomponent ocean-bottom seismic data, which effectively reduces ghosting and water-layer reverberation by combining hydrophone and vertical geophone data. In this study, we processed and analysed ocean-bottom cable data from a shallow gas area offshore from Korea. In our field-survey simulation, PZ summation was applied to the synthetic data to separate up-going and down-going wavefields and attenuate free-surface multiples. In addition, improved image can be obtained compared to conventional stack section by applying seismic interferometry to the acquired up-going wavefield data.