The invention relates to the technical field of seismic
signal processing, and relates to an offshore seismic data double-detection merging method based on multi-
channel pattern matching, which comprises the following steps: inputting water detection data and land detection data; introducing an instrument correction factor to perform
frequency matching on the land detection data to obtain corrected land detection data; obtaining a
phase matching factor from the corrected land detection data in a Hilbert transform domain by using a
phase matching factor
characteristic equation, and applying the
phase matching factor to the land detection data to obtain land detection data after
phase correction; enveloping and
smoothing the land detection data after
phase correction to realize amplitude
energy balance, and obtaining the land detection data after amplitude consistency correction; calculating multi-channel joint coefficients for the land detection data, and acting each joint coefficient on respective adjacent multi-
channel data to obtain multi-channel joint land detection data; and carrying out
pattern matching on the obtained multi-channel combined land detection data, and then combining the land detection data with the water detection data to obtain a double-detection combination result. According to the invention, an accurate water and land detection data merging result can be obtained.