南海南部深水区中深层地震成像关键技术及应用OA

The deep-water area of the southern South China Sea is a crucial strategic successor zone for petroleum resources in China,and its exploration and development hold significant importance in ensuring national energy security.As exploration targets extend to greater depths,the quality of mid-to deep-seismic imaging has become a key constraint on understanding deep geological structures and identifying hydrocarbon reservoirs.Seismic data in this region face challenges such as a low signal-to-noise ratio(SNR)at low frequencies,a narrow effective bandwidth due to ghost-notch effects,and inaccurate velocity modeling in complex structural areas.To address these issues,this study proposes an integrated processing workflow that employs amplitude-preserving broadband noise attenuation technology to suppress low-frequency noise and improve low-frequency signal-to-noise ratio(SNR),applying adaptive de-ghosting technology to eliminate notch effects,broadening the effective bandwidth,and introducing a high-density dual-spectrum velocity analysis to construct an accurate anisotropic velocity model.Application to real data demonstrates that this combination of technologies effectively improves the quality of mid-to deep-seismic imaging.The clarity of deep reflective structures and the continuity of seismic events were significantly enhanced,providing a reliable geophysical data foundation for hydrocarbon exploration in deepwater areas.