FTX processing method for suppressing strong energy sea surface ghost waves, storage medium and processing terminal

Abstract

The invention belongs to the technical field of ocean data digital signal processing, and discloses an FTX processing method for suppressing high-energy sea surface ghost waves, a storage medium and a processing terminal.The FTX processing method for suppressing the high-energy sea surface ghost waves comprises the steps that a seawater layering and signal acquisition model is constructed for signal acquisition, frequency division processing is conducted on the acquired signals, and the frequency division processing is conducted on the acquired signals; meanwhile, corresponding ghost wave components are selected and processed, and recovery signals are obtained; and processing the recovery signal by using an FTX processing method. The method is only applied to the part, interfered by noise, of the data, the part not interfered by the noise is not changed, the method is effective for noise of any time difference mode in the data, ghost waves and effective waves in the seismic data are truly separated, the ghost waves in the seismic data are removed, and the seismic data are effectively extracted. And meanwhile, the theory that the noise is defined by signals or the signals are defined by the noise in the conventional signal-to-noise separation method is avoided. The method can be applied to local noise with high aliasing frequency, and data bandwidth is reserved.

Description

technical field [0001] The invention belongs to the technical field of marine data digital signal processing, and in particular relates to an FTX processing method for suppressing strong-energy sea surface ghost waves, a storage medium, and a processing terminal. Background technique [0002] At present: Applying the ghost wave suppression method in the field of offshore oil and gas exploration and development can overcome the notch phenomenon of the seismic wavelet spectrum and obtain broadband seismic data. The broadband seismic data can effectively suppress the side lobes of the seismic wavelet and improve the accuracy of the seismic data. resolution. [0003] At present, there are two main methods for suppressing ghost waves: 1. Through special acquisition methods, including upper and lower dual source acquisition, upper and lower cable acquisition, double detection acquisition, streamer three-component acquisition, submarine cable acquisition, variable depth cable acqui...

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Problems solved by technology

[0003] At present, there are two main methods for suppressing ghost waves: 1. Through special acquisition methods, including upper and lower dual source acquisition, upper and lower cable acquisition, double detection acquisition, streamer three-component acquisition, submarine cable acquisition, variable depth cable acquisition, etc. , and then cooperate with corresponding processing methods to realize the suppression of ghost waves, but the realization of these methods will increase the difficulty of controlling the source and cables in the acquisition process; 2. Based on the data collected by ordinary horizontal streamers, use processing methods to suppress ghost waves Wave, mainly including flat cable ghost wave suppression method based on reverse time migration, flat cable ghost wave suppression method based on inverse scattering series method, τ-p domain flat cable ghost wave suppression method based on rough sea surface reflection coefficient, The ghost wave suppression method based on deterministic wavelet processing, the ghost wave suppression method based on iterative inversion of wave equation, etc., can effectively use most of the current marine seismic data without re-acquisition construction for the processing of horizontal streamer data. The requirements for processing technology are relatively high. Most of the existing technologies are based on the assumption that the depth of the source and the streamer is known and the sea surface reflection coefficient is -1. The depth of the sea is changing all the time, and the reflection coefficient of the undulating sea surface in the actual situation is not -1, so the existing processing methods cannot completely suppress the ghost wave, and the influence of the ghost wave still exists on the seismic wavelet frequency band

[0004] Through the above analysis, the problems and defects of the existing technology are: the existing processing methods cannot completely suppress the ghost wave, resulting in low resolution of the acquired seismic signal

[0005] The difficulty of solving the above problems and defects is: the current existing ghost wave suppression method cannot avoid damage to the effective signal when suppressing the ghost wave signal. If the effective signal strength is to be ensured, the ghost wave signal will remain too much, resulting in The resolution of seismic signals is reduced. How to adopt a processing method to effectively suppress ghost waves while avoiding damage to effective signals is a problem that needs to be overcome in the field of ghost wave suppression.

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