A Ghost Suppression Method Based on Spectrum Reconstruction

Abstract

The invention relates to a ghost wave suppression method based on frequency spectrum reconstruction. The ghost wave pressing method based on the frequency spectrum reconstruction is characterized by comprising the following steps that (1) original earthquake data are subjected to two-dimensional fourier transform, the earthquake data in f-k domain are obtained, the earthquake data in the f-k domain are subjected to inverse filtering of ghost wave by using a self-adaptive parameter estimation method, and trapped wave zone of the ghost wave is located; (2) according to the location in the step (1), frequency component other than result location of the inverse filtering of the ghost wave is used as effective value, iteration is carried out by using curvelet transform and convex set projectionalgorithm, and frequency spectrum in the trapped wave zone is reconstructed; and (3) the frequency spectrum after reconstruction is subjected to two-dimensional fourier transform, and is transformedto time-space domain, and a suppression result of the ghost wave is obtained. The ghost wave suppression method based on the frequency spectrum reconstruction can be widely used in the field of ghostwave pressing in the earthquake data.

Description

technical field [0001] The invention relates to a method for suppressing ghost waves based on frequency spectrum reconstruction, which is a means for improving the resolution of seismic data and belongs to the field of geophysics. Background technique [0002] Ghost wave is a non-negligible influencing factor in the process of seismic data processing, which will greatly reduce the data resolution of marine seismic exploration. Effective ghost wave suppression can improve the resolution of seismic data and the accuracy of subsequent seismic migration, thereby improving the effective utilization of seismic data, which is of great significance to the processing of marine seismic data. Better ghost suppression can be performed by changing the tow cable or detection method, such as variable depth cable technology and double detector method. There is also a widely used ghost wave suppression method in the f-k domain, which directly uses the ghost wave inverse filter to suppress g...

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Problems solved by technology

[0003] The difficulty of using the ghost wave inverse filtering method to suppress ghost waves is mainly that it cannot restore the part of the original seismic data affected by the ghost wave with a low signal-to-noise ratio, and the ghost wave inverse filter method is directly used for the frequency components with a signal-to-noise ratio less than 1 , will amplify the noise, thereby reducing the signal-to-noise ratio

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