Abstract：Research purposes: The construction of offshore engineering such as cross-sea bridges and subsea tunnels requires the identification of sedimentary layer structure and thickness, fault distribution and activity characteristics, bedrock relief and weathered layer thickness, as well as the distribution range of special geological bodies using a multi-channel seismic reflection method. However, offshore environments for multi-channel seismic data acquisition are subject to many constraints, such as shallow water depth, high flow rate, intensive aquaculture and fishing activities, which can result in short collection cables without attitude control. Additionally, due to the short collection cables, the coverage times are reduced, making speed analysis difficult. The quality of the seismic data obtained is relatively poor, with problems such as low signal-to-noise ratio, strong multiple waves, and cable attitude issues, which require targeted analysis and processing. Research conclusions: (1) Seismic data are significantly improved in resolution and signal-to-noise ratio through technical processing such as joint noise suppression, multiple wave combination suppression, increasing coverage times, and cable time difference correction. (2) The produced seismic profile after processing clearly shows the production state and structural morphology of each major reflection layer from shallow to deep, and the geological phenomena are clear. (3) In response to the difficulties and challenges encountered in data processing such as complex noise types, difficulty in multiple wave suppression, and difficulty in speed analysis, a set of multi-channel seismic data processing technical processes applicable to offshore engineering has been summarized, which has certain guiding significance for the data processing of subsequent high-resolution multi-channel seismic exploration in offshore engineering.
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2024, Vol. 41 
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