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.

海洋地震勘测广泛用于勘探石油和天然气资源以及监测CO ₂贮存。特别是海底地震勘探可以在不受水层环境影响的情况下获取高质量的数据。然而，海底地震勘测比拖缆勘测更昂贵，并且纵波勘测数据呈现自由表面多次波，这是长期存在的问题。PZ求和可用于处理多分量海底地震数据，通过结合水听器和垂直检波器数据，有效减少重影和水层混响。在这项研究中，我们处理和分析了韩国近海浅层天然气区域的海底电缆数据。在我们的现场勘测模拟中，将 PZ 求和应用于合成数据，以分离上行和下行波场并衰减自由表面多次波。此外，