快速有效的转换波共转换点叠加技术
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摘要
转换波共转换点 (CommonConversionPoint简称CCP)叠加的关键在于CCP抽道集和非双曲线正常时差校正NMO(NormalMoveOut) .目前方法的精度限制了其在中 -浅层或大炮检距情况下的应用 .我们对CCP叠加技术进行了系统研究 ,导出了新的CCP位置计算公式和非双曲线时距关系式 ,并给出了具体的CCP抽道集方法 .理论模型试验和实验资料处理表明本文方法精度高、简便易行 ,特别是对于中 -浅层和大炮检距情况也能得到良好的叠加效果 .
Common conversion point (CCP) binning and non hyperbolic normal moveout (NMO) are two key points to CCP stacking for converted waves. The accuracy of the existing methods is too low to be used for shallow middle events or for large offsets. After studying CCP stacking technique in details, we presented new formulas for CCP points and non hyperbolic time distance relation, and as well, gave an implementation for CCP binning. The tests of synthetic model and processing of real data proved that our method is accurate and easy to be implemented. The stacking is good enough even for shallow middle events and for large offsets.
Common conversion point (CCP) binning and non hyperbolic normal moveout (NMO) are two key points to CCP stacking for converted waves. The accuracy of the existing methods is too low to be used for shallow middle events or for large offsets. After studying CCP stacking technique in details, we presented new formulas for CCP points and non hyperbolic time distance relation, and as well, gave an implementation for CCP binning. The tests of synthetic model and processing of real data proved that our method is accurate and easy to be implemented. The stacking is good enough even for shallow middle events and for large offsets.
引文
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[2] ZhuX .Recentadvancesinmulticomponentprocessing.TheLeadingEdge,1999,18(11):1283—1289.
[3] 何汉漪,朱宏彰.海上多波地震技术及其应用[研究报告].北京:中国海洋石油总公司,1999.HEHanYi,ZHUHongZhang.Marinemulticomponentseismologyanditsapplications[Researchreport].Beijing:CNOOC ,1999.[4] TessmerG ,BehleA .Commonreflectionpointdata stackingtechniqueforconvertedwaves.GeophysicalProspecting,1988,36(7):671—688.
[5] 沈永欢等编.实用数学手册.北京:科学出版社,1992.SHENYongHuanetal.AppliedMathematicalHandbook.Beijing:SciencePress,1992.
[6] ZhangY ,RobinsonEA .StackingP SVconvertedwavedatawithraypathvelocity.62 ndAnn.Internat.Mtg.,Soc.Expl.Geophys..ExpandedAbstracts,1992,1214—1217.
[7] 周竹生,王卫华.一种快速、高精度的共转换点轨迹计算方法.石油地球物理勘探,1993,28(1):37—45.ZHOUZhuSheng,WANGWeiHua.Amethodforfastandaccuratelycomputingthecommonconversionpointlocus.OilGeophysicalProspecting,1993,28(1):37—45.
[8] ZhangY .Nonhyperbolicconvertedwavevelocityanalysisandnormalmoveout,66thAnn.Internat.Mtg.,Soc.Expl.Geo phys..ExpandedAbstracts,1996,1555—1558.
[9] 马在田,曹景忠,王家林等编著.计算地球物理学概论.上海:同济大学出版社,1997.MAZaiTian,CAOJingZhong,WANGJiaLin,etal.SurveyofComputationalGeophysics.Shanghai:TongjiUniv.Press,1997.
[10] 许士勇,马在田.转换波的转换点位置和时距关系.见:地球物理学会年刊1999.合肥:安徽科学技术出版社,1999,27.XUShiYong,MAZaiTian.Common conversion pointtrajectoryandtime distancerelationofconvertedwaves.In:AnnualoftheChineseGeophysicalSociety1999.Hefei:AnhuiScienceandTechnologyPress,1999,27.
[11] SlotboomRT .Convertedwave(P SV)moveoutestimation.60 thAnn.Internat.Mtg.,Soc.Expl.Geophys..ExpandedAb stracts,1990,1104—1106.
[12] AkiK ,RichardsPG .QuantitativeSeismology:TheoryandMethods.SanFrancisco:W .H .FreemanandCompany,1980.
[13] 李录明,罗省贤.P SV转换波速度分析及解释方法.石油地球物理勘探,1995,30(1):66—74.LILuMing,LUOShengXian.VelocityanalysisandinterpretationofP SVwave.OilGeophysicalProspecting,1995,30(1):66—74.
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