Dynamic correction stacking method preventing dynamic correction stretching

Abstract

The invention is a dynamic correction stacking method for avoiding dynamic correction stretching in seismic data processing. The following technical scheme is adopted: collect seismic waves with the usual multiple coverage technology, and use co-CMP superposition and wavelet superposition with different arrival times to calculate the recorded value of each sampling time ti in the self-excited and self-received records (use ti to represent the self-excited and self-received The recording time of the receiver channel, the subscript i indicates corresponding to the i-th sampling point). In the processing process of the present invention, there is no recording or stretching of seismic waves, which avoids frequency reduction and longitudinal resolution reduction caused by dynamic correction stretching, and improves the frequency and longitudinal resolution of the middle and shallow layers on the stacked section. The invention replaces the dynamic correction and common CMP gather superposition in the traditional processing flow, ensures that each group of reflected waves can be corrected correctly and does not cause stretching distortion of the reflected waves, and improves the profile frequency, longitudinal resolution and signal-to-noise Compare.

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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