Method of pre-stack denoising for seismic data

Abstract

Disclosed is a method for carrying out pre-stacking noise reduction on seismic data. The method comprises the steps that cross arrangement data of shot lines and seisline are extracted from the collected seismic data; the fitting straight line of the shot lines and the fitting straight line of the seisline are obtained according to the extracted cross arrangement data of the shot lines and the seisline; the intersection point of the fitting straight line of the shot lines and the fitting straight line of the seisline is obtained; a straight line which passes through the intersection point and is perpendicular to the fitting line of the shot lines is generated; the projection points that all geophone points on the seisline are projected to the perpendicular line and the projection points that all shot points on the shot lines are projected to the fitting straight line of the shot lines are used as the cross arrangement data of the shot lines and the seisline; noise is reduced based on the acquired cross arrangement data of the shot lines and the seisline. According to the method, the cross arrangement data of the shot lines and the seisline in the seismic data can be acquired fast with low cost, and then pre-stacking noise reduction is carried out based on the acquired cross arrangement data.

Description

technical field [0001] The invention relates to the field of petroleum seismic data exploration, more specifically, relates to a method for performing pre-stack denoising on seismic data. Background technique [0002] During the acquisition and processing of seismic data in petroleum seismic exploration, there will be some disturbances (such as surface waves, shallow multiple refraction waves, etc.), which make the seismic data unable to truly reflect the effective information of the underground interface. Only when the signal-to-noise ratio and resolution are improved, will it provide guarantee for subsequent processing and interpretation work. [0003] Due to the limitation of terrain conditions, the design of the observation system is easily affected by the objective terrain and changes in the process of mountain seismic data acquisition. For example, in the ideal observation system design situation, the shot line and the receiver line are both a straight line, but in th...

AI Technical Summary

Problems solved by technology

[0004] The currently used method of extracting cross-arranged data is to rearrange the data by sorting, but if it is a large three-dimensional work area, it takes a long time to rearrange the data, and the computer requirements are high, which increases the calculation cost

Especially for the irregular observation system and the irregular beam orthogonal observation system, if the shot line and the receiver line are not straight lines, it is more difficult to realize

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