利用地震属性求取剩余静校正的方法
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摘要
利用地震属性求取剩余静校正始于剩余时差的拾取,即首先对参加相关的道集和叠加数据进行地震属性处理(对数据进行瞬时相位或振幅包络处理等),然后进行剩余时差的拾取。文中基于常规自动剩余静校正存在的问题,讨论了利用地震属性求取剩余静校正的方法,用实例说明了方法的效果。实例研究结果表明:①经过野外校正和一次速度分析后,长波长校正量问题得到解决,但同相轴的连续性仍然较差,明显存在剩余静校正问题;②对数据进行常规自动剩余静校正后,信噪比得到明显提高;当继续进行第二次、第三次剩余静校正迭代时,难以再看到明显的处理效果;③利用地震属性求取剩余静校正对数据校正后,除剖面信噪比明显提高外,剖面整体面貌较常规自动剩余静校正后的结果更清晰,局部细节更加清楚。说明利用地震属性求取剩余静校正的方法是可行的。
The idea for application of seismic attributes in residual static correction is from picking-up residual moveout. Firstly the seismic attributes of the seismic gathers and stacked seismic data which were used in correlation were extracted (extracting simultaneous phase, amplitude envelope and so on) , then the residual moveout were picked up. Based on the problems existing in routine automatic residual static correction, the method of application of seismic attributes in residual static correction was discussed in this paper, and the effects was illustrated by using real examples. The field data studies results show the following: (1)After field static correction and 1st velocity analysis, long-wavelength correction problem got resolved, while the continuity for seismic events is still not great and problem for residual static correction still exists. (2)After conducting routine automatic residual static correction, the data SNR (Signal to Noise Ratio) was obviously improved, but after 2nd and 3rd residual static correction iteration, no improvement was seen. (3)After applying the static values which were estimated from application of seismic attributes in residual static correction to the seismic data, the Signal to Noise Ratio of the seismic sections were greatly improved, moreover the details and whole appearance of the seismic sections were much clearer and sharper, as a result it can be concluded in this paper that the method of application of seismic attributes in residual static correction is feasible and applicable.
The idea for application of seismic attributes in residual static correction is from picking-up residual moveout. Firstly the seismic attributes of the seismic gathers and stacked seismic data which were used in correlation were extracted (extracting simultaneous phase, amplitude envelope and so on) , then the residual moveout were picked up. Based on the problems existing in routine automatic residual static correction, the method of application of seismic attributes in residual static correction was discussed in this paper, and the effects was illustrated by using real examples. The field data studies results show the following: (1)After field static correction and 1st velocity analysis, long-wavelength correction problem got resolved, while the continuity for seismic events is still not great and problem for residual static correction still exists. (2)After conducting routine automatic residual static correction, the data SNR (Signal to Noise Ratio) was obviously improved, but after 2nd and 3rd residual static correction iteration, no improvement was seen. (3)After applying the static values which were estimated from application of seismic attributes in residual static correction to the seismic data, the Signal to Noise Ratio of the seismic sections were greatly improved, moreover the details and whole appearance of the seismic sections were much clearer and sharper, as a result it can be concluded in this paper that the method of application of seismic attributes in residual static correction is feasible and applicable.
引文
[1]Wiggins R A,Larner K L and Wisecup R D.Residualstatics analysis as a general linear inverse problem.Ge-ophysics,1976,41(5):922~928
[2]Trace AttributesSectionGenerator.OmegaSPS,Write-ups.WesternGeco
[3]Cross-correlation Picking of Reflection Ti mes.OmegaSPS,Write-ups.WesternGeco
[4]Reflection MISER Statics Computation.Omega SPS,Write-ups.WesternGeco
[5]Statics Update.Omega SPS,Write-ups,WesternGeco
[2]Trace AttributesSectionGenerator.OmegaSPS,Write-ups.WesternGeco
[3]Cross-correlation Picking of Reflection Ti mes.OmegaSPS,Write-ups.WesternGeco
[4]Reflection MISER Statics Computation.Omega SPS,Write-ups.WesternGeco
[5]Statics Update.Omega SPS,Write-ups,WesternGeco
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