转换波地震资料处理的关键问题与解决方法
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摘要
针对转换波地震资料检波点静校正量过大的问题,分析了现有的转换波处理技术、波形变化、静态时移对面波压制影响.结果认为,面波压制、转换波静校正、速度分析等是影响转换波处理质量的关键.提出了基于模型的面波压制技术和利用共检波点叠加静校正和最大叠加能量剩余静校正的解决方案,为提高转换波速度分析的精度,利用变速抽取共转换点道集的方法,实现了真正的共转换点速度分析.对三维转换波地震资料的处理结果表明了该方法的正确性和有效性.
Aiming at the problem of large quantities of static correction of detection points, the converted-wave process technique and the effect of waveform change and static time shift on suppression of surface wave are analyzed. The authors hold that the suppression of surface wave, static correction of converted wave, and velocity analysis are the key for converted wave process. The problem-solving plan has been put forward based on the surface wave suppression technique, the static correction of common receiver stack, and the residual static correction of maximum stack-power. Real common converted point velocity analysis is achieved by using the velocity-variable common converted point gathering. The process of real 3D converted-wave seismic data shows that the methods are correct and effective.
Aiming at the problem of large quantities of static correction of detection points, the converted-wave process technique and the effect of waveform change and static time shift on suppression of surface wave are analyzed. The authors hold that the suppression of surface wave, static correction of converted wave, and velocity analysis are the key for converted wave process. The problem-solving plan has been put forward based on the surface wave suppression technique, the static correction of common receiver stack, and the residual static correction of maximum stack-power. Real common converted point velocity analysis is achieved by using the velocity-variable common converted point gathering. The process of real 3D converted-wave seismic data shows that the methods are correct and effective.
引文
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[2] 高少武,赵 波,周兴元.自适应相干噪声衰减技术[J].石油地球物理勘探,2003,38(3):242-246.GaoSW,ZhaoB,ZhouXY.Self-adaptivecoherentnoiseattenuationtechnique[J].OilGeophysicalProspecting,2003,38(3):242-246.
[3] 熊 翥.如何改进滤波的效果[J].物探科技通报,1994,12(1):21-29.XongZ.Howtoimprovefilter[J].TheNewsofGeophysicalProspectingTechnology,1994,12(1):21-29.
[4] RonenJ,ClaerboutJF.Surface-consistentresidualstaticsestimationbystack-powermaximization[J].Geophysics,1985,50(12):2759-2767.
[5] 毛小平,姚 姚.转换横波迭代法快速速度分析[J].中国海上油气,1999,13(5):363-366.MaoXP,YaoY.Afastiterativemethodforvelocityanalysisfortransversewave[J].ChinaOffshoreOilandGas,1999,13(5):363-366.
[6] 何宗强.转换波变速抽道速度分析方法[J].石油地球物理勘探,1999,34(4):442-447.HeZQ.Converted-wavevelocityanalysisbyvelocity-variabletracegathering[J].OilGeophysicalProspecting,1999,34(4):442-447
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