低信噪比地震数据散射成像方法及应用
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摘要
介绍了基于等效偏移距的共散射点道集成像方法。该方法分3步实现:①共散射点道集的形成;②共散射点道集速度分析;③对共散射点道集进行克希霍夫积分偏移。煤层气二维地震实际数据散射成像与常规偏移方法的测试处理对比表明:散射成像有利于提高低信噪比地震数据的偏移归位精度和小断层的成像效果。
Introduced a scattered-wave imaging method based on the common scattered point(CSP) gathers of equivalent offset.The method consists of three steps:first is forming CSP gathers;second is velocity analysis on CSP gathers;third is applying Kirchhoff migration on CSP gathers.Real 2D CBM seismic data test processing in scattered-wave image and conventional migration method show that scattered-wave imaging benefits to low signal-to-noise seismic data imaging,and it can get better migration profiles and small faults imaging.
Introduced a scattered-wave imaging method based on the common scattered point(CSP) gathers of equivalent offset.The method consists of three steps:first is forming CSP gathers;second is velocity analysis on CSP gathers;third is applying Kirchhoff migration on CSP gathers.Real 2D CBM seismic data test processing in scattered-wave image and conventional migration method show that scattered-wave imaging benefits to low signal-to-noise seismic data imaging,and it can get better migration profiles and small faults imaging.
引文
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[12]Flower J C.A comparative overview of prestack time migrationmethods[A].Expanded Abstracts of 66th Annual Internat SEGMtg[C].1996:1 571-1 574.
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[14]Paul Docherty.Abrief comparison of some Kirchhoff integral formu-las for migration and inversion[J].Geophysics,1991,56(8):1 164-1 169.
[15]Bancroft J C.Optimum CSP gathers with fixed equivalent offset[R].CREWES Project Research Report,1998c,Vol.10,Ch.44-1~44-5.
[2]姚陈,蔡明刚,王赟.各向同性薄层反射理论地震图[J].地球物理学报,2010,53(1):164-170.Yao Chen,Cai Minggang,Wang Yun.Synthetic seismograms of re-flection from isotropic thin layer[J].Chinese Journal of Geophysics,2010,53(1):164-170.
[3]王赟,芦俊,尹军杰,等.地震勘探还能给煤层气勘探开发做点什么?[A].2009亚太地区国际煤层气会议暨2009年全国煤层气学术研讨会论文集[C].徐州:中国矿业大学出版社,2009.
[4]Bancroft J C,Geiger HD.Equivalent offset CRP gather[A].Presen-ted at 64th SEG Mtg[C].1994:672-675.
[5]Bancroft J C,Geiger H D,Foltinek D,et al.Prestack migration byequivalent offsets and common scatter point(CSP)gathers[A]:57thMtg.Eur.Assoc.Expl Geophys,Extended Abstracts[C].1995:124.
[6]Bancroft J C.Natural antialiasing in equivalent offset prestack migra-tion[A].66th Annual Internat.Mtg.,Soc.Expl.Geophys.,Expand-ed Abstracts[C].1996:1 465-1 466.
[7]Bancroft J C.Computational speed of EOM relative to standardKirchhoff Migration[R].CREWES Project Research Report,1998b,Vo1.10,43-1~43~6.
[8]Bancroft J C,Geiger HD,Margrave G F.The equivalent offset meth-od of prestack time migration[J].Geophysics,1998,63(6):2 042-2 053.
[9]尹军杰.地震散射波场特征的数值模拟研究[D].北京:中国地质大学(北京),2005.
[10]尹军杰.散射波成像方法研究[D].北京:中国科学院地质与地球物理研究所,2009.
[11]Wang Yun,Yin Junjie,Guo Bin.The numerical simulation and im-aging of seismic scattered wave applied to base metal exploration[J].Exploration Geophysics,2009(40):320-324.
[12]Flower J C.A comparative overview of prestack time migrationmethods[A].Expanded Abstracts of 66th Annual Internat SEGMtg[C].1996:1 571-1 574.
[13]王伟,尹军杰,刘学伟,等.等效偏移距方法及应用[J].地球物理学报,2007,50(6):1 823-1 830.Wang Wei,Yin Junjie,Liu Xuewei,et al.Equivalent offset methodand its application[J].Chinese Journal of Geophysics,2007,50(6):1 823-1 830.
[14]Paul Docherty.Abrief comparison of some Kirchhoff integral formu-las for migration and inversion[J].Geophysics,1991,56(8):1 164-1 169.
[15]Bancroft J C.Optimum CSP gathers with fixed equivalent offset[R].CREWES Project Research Report,1998c,Vol.10,Ch.44-1~44-5.
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