NMO correction stacking method preventing NMO stretching

A superposition method and dynamic correction stretching technology, applied in the field of geological exploration, can solve problems such as poor results, precise dynamic correction contradictions, and inability to achieve synchronization

Active Publication Date: 2008-02-27
BGP OF CHINA NAT GASOLINEEUM CORP +1
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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 correcti

Method used

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  • NMO correction stacking method preventing NMO stretching

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Embodiment Construction

[0040] The present invention calculates each sampling time t in the self-excitation and self-reception record according to the following steps i record value (use t i Indicates the recording time of self-excited and self-retracted seismic traces, and the subscript i indicates corresponding to the i-th sampling point), and the stacking is completed by co-CMP stacking.

[0041] Specifically take the following steps:

[0042] 1) Acquire seismic waves with the usual multiple coverage technique;

[0043] 2) carry out pre-processing with common technology; Described pre-processing includes: adding known observation system information to the trace header of seismic records; removing surface waves; removing high-energy interference; performing trace editing to remove bad tracks; doing geometric divergence compensation and Surface consistent amplitude compensation; do deconvolution; do static correction;

[0044] 3) Obtain the time-speed data on different CMPs with common techniques...

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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...

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 董凤树
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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