Pre-stack seismic data spectrum expansion method based on angle division processing

Abstract

The invention discloses a pre-stack seismic data spectrum expansion method based on angle division processing. The method comprises the following steps: step 01, reading CRP gather data, and dividingthe data into a far angle, a middle angle and a near angle; step 02, setting corresponding ratio parameters at the CRP gather sub-angles in the step 01, and determining a reference frequency and a frequency expansion range for each gather of data in the sub-angles; step 03, performing continuous wavelet transform on each gather of data of the CRP gather sub-angles in the step 02, and converting the data from time domain to time-scale domain; and step 04, expanding the signal bandwidth in the time-scale domain, carrying out inverse transformation of continuous wavelet transformation, reconstructing a spread-spectrum high-resolution time signal, and obtaining CRP gather data after bandwidth expansion; repeating the steps 03 and 04 till finishing processing all gathers of data. By applying the method, the energy information of the high-frequency end and the low-frequency end can be effectively predicted, the seismic signal bandwidth is expanded, the signal resolution is obviously improved, and a high signal-to-noise ratio is kept.

Description

Technical field [0001] The invention belongs to the field of seismic exploration data processing, and in particular relates to a method for broadly expanding the frequency spectrum of pre-stack seismic data through angle processing technology. Background technique [0002] Improving the resolution of seismic data is one of the main tasks of seismic data processing. To obtain a high-resolution seismic profile, it is often necessary to rely on technology to improve resolution processing. Since the post-stack data suppresses the noise, the high-frequency effective information is obviously lost, so the high-frequency expansion capability based on the post-stack seismic data is obviously limited. The pre-stack seismic data is the most primitive record of seismic signals, which contains abundant high-frequency and low-frequency effective information. The profile after pre-stack migration has clear fault imaging, accurate homing, more detailed geological morphology, and better results ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of pre-stack seismic data frequency spectrum extension method based on sub-angle processing, carry out sub-angle processing to CRP gather according to parameters such as effective bandwidth of original data, finally expand the effective bandwidth of CRP gather data, Improve the resolution of pre-stack and post-stack seismic data and the interpretation ability of pre-stack data to solve the problems existing in existing technologies

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