Method for correcting seismic time-varying wavelet phase based on sectional prolongation

Abstract

The invention relates to a method for correcting a seismic time-varying wavelet phase based on sectional prolongation, and belongs to the field of processing of seismic exploration signals. The method is characterized being performed for the seismic record of the phase time varying after the time-varying wavelet amplitude influence is completely removed. The method comprises the steps of dividing the seismic record into a plurality of mutually overlapped equilong fragments; extracting wavelet phase residue from each fragment through the method based on optimizing of a pure-phase filter; performing prolongation for the wavelet phase residue to reach each time point by the multi-item fitting method; finally recovering a reflectance coefficient sequence by the linear time-frequency transformation based time-varying phase deconvolution method, so as to correct the time-varying wavelet phase. The data simulation verification shows that the method is able to effectively correct the time-varying wavelet phase of instable seismic record, so that the resolution of the seismic record can be increased.

Description

Technical field: [0001] The invention belongs to the field of seismic exploration signal processing. Background technique: [0002] Nowadays, the exploration and development of oil and gas fields are developing in the direction of small-scale and thin reservoirs, and the precision requirements for seismic exploration are getting higher and higher. In order to adapt to the dynamic prediction of oil and gas reservoirs and search for complex structural and lithological oil and gas reservoirs, the sections after seismic processing are required to have the "three highs" characteristics of high signal-to-noise ratio, high resolution and high fidelity. [0003] Seismic exploration includes three links: field acquisition, indoor processing and seismic data interpretation. In order to improve the resolution of seismic records, it is necessary to work hard on each link of acquisition, processing and interpretation, and tap the capabilities of each link to achieve high quality in each...

AI Technical Summary

Problems solved by technology

At present, no effective method for time-varying phase processing has been retrieved, but the existence of wavelet time-varying phase in seismic records processed by traditional stacking, migration, and compensation seriously affects the accuracy of various processing results, so it is urgent An effective time-varying wavelet phase correction method is needed to improve the resolution of actual seismic data

[0006] The present invention proposes a time-varying seismic wavelet phase correction method based on segmental continuation to solve the problem of wavelet phase correction in non-stationary seismic records and achieve the purpose of improving the resolution of seismic records

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