Abstract: The distribution pattern of natural gas reservoirs in Baiyun Sag, northern South China Sea, is determined by the matching relationship between late-active faults, diapiric zones and structural ridges. Shallow gas, hydrates, volcanoes, and other anomalous bodies developed due to diapirism have caused blurring of seismic data in the middle-deep strata.To delineate effective traps in the diapiric ambiguous zone and advance regional exploration and research process, towed streamer rolling seismic acquisition technology was innovatively applied to acquire seismic data with high fold and long offsets. In the data processing stage, time-lapse full waveform inversion (TLFWI), Q-compensated full waveform inversion (QFWI) and Q-compensated prestack depth migration (QPSDM) technologies were adopted for high-precision velocity modeling and imaging. These measures effectively improved the signal-to-noise ratio (SNR) and stratigraphic continuity of seismic data in the ambiguous zone, resulting in more focused structural imaging and clearer fault imaging.The study has demonstrated that seismic data with high fold and long offsets form the foundation for addressing imaging challenges in the deep water diapiric ambiguous zone, while the subsequent targeted high-precision velocity modeling based on FWI and QPSDM serve as the core technologies. The combination of these two aspects can effectively address the imaging problems in the deep water diapiric ambiguous zone.