Ellipse correction method of seismic data, dynamic correction method and velocity spectrum calculation method

Abstract

The invention provides an ellipse correction method of seismic data, a dynamic correction method and a velocity spectrum calculation method. According to the methods, ellipse correction, dynamic correction and autocorrelation are sequentially performed on the seismic data to obtain a velocity spectrum. According to the methods, elliptical transformation of travel time is adopted to eliminate the influence of the dip angle of an underground complex structure; dynamic correction is adopted to calculate travel time difference correction so as to obtain a more accurate dynamic correction quantity;and the resolution of the velocity spectrum can be eventually increased.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas seismic exploration investigation, and more specifically relates to a seismic data processing and interpretation method for petroleum seismic exploration. Background technique [0002] In the conventional data processing of petroleum seismic exploration, it is usually assumed that the subsurface medium is horizontally layered, and the velocity in the layer is horizontally constant or changes slowly. Therefore, in the same common center point gather, the travel time calculation formula used in the velocity analysis is Among them, t is the travel time corresponding to the half-offset x, and t 0 is the self-excitation and self-reception time, x is the half-offset distance, and v is the root mean square velocity. In the actual production and application in complex areas, the unevenness of the velocity of the underground medium, the longitudinal and lateral changes will cause the uneven trave...

AI Technical Summary

Problems solved by technology

In the actual production and application in complex areas, the unevenness of the velocity of the underground medium, the longitudinal and lateral changes will cause the uneven travel time of seismic wave propagation, and the calculation according to the conventional travel time calculation formula will lead to inaccurate calculation of the travel time of the velocity spectrum, making the same common Center point gathers cannot be superimposed in phase, and the resolution of the final velocity spectrum is not high

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