NMO correction stacking method preventing NMO stretching

Abstract

The invention is about the dynamic correction superimposed method to avoid the dynamic correction tension in the earthquake data processing. The technology program: it collects the earthquake wave by the normal multiple coverage technology; it records the ti value of each sampling time in the record of excitation and receiving self by the CMP gathering and the wavelets gathering (ti stands for the recording time of self-excitation and receiving earthquake track; the i stands for the i sampling point). In the processing of invention, it does not form the wave tension or record. So it can avoid the frequency and vertical distinguishability reduction and improve the middle-low frequency and vertical distinguishability on gathering section. The invention has instead of the dynamic correction and CMP gathering in traditional processing, so it can correct each reflecting wave but not make it tension to improve the section frequency, the vertical distinguishability and SNR.

Description

technical field [0001] The invention relates to geological exploration technology, and relates to a dynamic correction stacking method for avoiding dynamic correction stretching in seismic data processing. Background technique [0002] In seismic exploration for petroleum or other purposes, explosives, vibrators, air guns and other seismic sources are used to excite seismic waves near the surface, and the seismic wave is received by a geophone to reflect the reflected waves transmitted to the surface through the formation wave impedance interface, and digitized, and then The data are processed to extract subsurface geological information for describing subsurface geological layers. [0003] Due to the destructiveness of the seismic source and the use of multiple coverage techniques, the receiver point and the seismic source cannot be in the same position, and the acquired seismic data belong to the same CMP with multiple offset relationships. In order to uniformly represent...

AI Technical Summary

Problems solved by technology

It is applied in a way that suits traditional processing habits, but is still partially stretch-free in practice and has local conflicts with precise motion correction

Each of the above methods is to partially realize the dynamic correction without stretching, but the requirements of such local dynamic correction are not met, and the dynamic correction cannot be completed coherently while avoiding stretching.

These methods show the style of forced modification of data and human intervention in the processing process. No stretching and normal correction can not be achieved simultaneously, and the effect is not good.

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