Upper and lower cable collecting data merging method and system based on green function

Abstract

The invention discloses an upper and lower cable collecting data merging method and system based on a green function. The upper and lower cable collecting data merging method comprises the steps thata pressure wave field at the depth between upper and lower cables is acquired; a pressure wave field vertical derivative corresponding to the depth of the pressure wave field is obtained based on thepressure wave field; and the pressure wave field and the pressure wave field vertical derivative corresponding to the depth of the pressure wave field are subjected to upper and lower cable collectingdata merging based on the green function, and thus a ghost-wave-free seismic wave field is obtained. The upper and lower cable collecting data merging method and system based on the green function have the advantages that upper and lower cable data can be effectively merged, and the frequency band of seismic data is greatly widened while ghost waves are removed; and the upper and lower cable collecting data merging method and system can adapt to impetuous ocean topography and geological situations by completely relying on data driving without underground medium information.

Description

technical field [0001] The invention relates to the field of marine broadband seismic exploration, and more specifically, to a method and system for merging data collected by upper and lower cables based on Green's function. Background technique [0002] In ocean streamer acquisition, the records received by the geophone include the primary reflection wave from the underground reflection interface and the ghost wave from the primary reflection wave to the geophone after reflection from the seawater surface. The ghost wave closely follows the primary reflection wave, interferes with the primary reflection wave, changes the waveform characteristics of the primary reflection wave, and even produces false events, which increases the difficulty of subsequent seismic data processing and interpretation. In addition, ghost waves have frequency notch characteristics, which cause notch points in the frequency spectrum of seismic data, and these notch points will lead to insufficient e...

AI Technical Summary

Problems solved by technology

Experts and scholars have proposed a variety of merging technologies for upper and lower cables, but for areas with complex structures, the merging accuracy and efficiency still cannot meet the exploration requirements, which restricts the practical application of upper and lower cable acquisition technologies

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