Non-stretch distortion correction method and device for recursive correction of dynamic correction amount

Abstract

The present invention provides a dynamic correction value recursion correction non-stretching distortion dynamic correction method and device. The method comprises the steps of: performing conventional dynamic correction for obtained pre-stack seismic data to obtain first pre-stack seismic correction data, and selecting a near offset trace with stretching distortion smaller than a preset proportion from the first pre-stack seismic correction data for overlapping to obtain model trace data; performing recurrence of the dynamic correction value correction range and a basic dynamic correction value of a current seismic trace according to the dynamic correction value of a previous offset of the current seismic trace; performing dynamic correction of the pre-stack seismic data according to thebasic dynamic correction value and the dynamic correction value correction range to obtain second pre-stack seismic correction data, and calculating a cross correlation coefficient of the second pre-stack seismic correction data and the model trace data; and selecting the correction value corresponding to the maximum cross correlation coefficient to perform dynamic correction for the pre-stack seismic data to obtain non-stretching distortion dynamic correction data. The dynamic correction value recursion correction non-stretching distortion dynamic correction method and device are more accurate in dynamic correction and smaller in correction range, can reduce the calculated amount and can avoid the cross strata phenomenon.

Description

technical field [0001] The invention relates to the technical field of exploration geophysics, in particular to a method and device for recursively correcting dynamic correction amounts without stretching distortion. Background technique [0002] In seismic data processing, dynamic correction is usually used (correcting the arrival time of reflected waves from the same interface and the same point on channels with different offsets to the echo time at the common center point, that is, normal moveout correction, the purpose is to achieve in-phase The method of stacking) eliminates the influence of offset on the propagation time of reflected waves, flattenes the events of reflected waves in pre-stack gathers (such as common midpoint gathers), and then performs horizontal stacking to obtain subsurface structure information. When the conventional dynamic correction method is used for dynamic correction, there may be phenomena such as stretching distortion and incomplete equaliza...

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Problems solved by technology

The basic dynamic correction amount of this method is the amount calculated by the conventional dynamic correction method, and the correction amount for all seismic traces is based on the zero offset trace, so for the event of a large offset, the correction amount is too large, Not only is there a problem with a large amount of calculation, but there may also be a cascading phenomenon

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