时空移动成像条件及偏移速度分析
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摘要
首先比较了深度聚焦速度分析和剩余曲率速度分析中的成像条件,然后通过时空移动成像条件得到了时移偏移距域共成像点道集和时移角度域共成像点道集.基于时移角度域共成像点道集,统一了偏移速度分析中通常应用的两个偏移速度判断准则:深度聚焦准则和成像道集拉平准则.最后基于时移角度域共成像点道集,推导了速度更新公式,并设计了速度分析流程.合成数据和实际地震资料上的测试证明了方法的可行性和有效性.
The imaging conditions of the depth-focusing velocity analysis and residual curvature velocity analysis are firstly compared.And then the time-shift offset domain common image gathers(TSODCIGs) and time-shift angle domain common image gathers(TSADCIGs) through the space-time-shift imaging condition are presented.According to the discussion on the TSADCIGs,the two criteria(depth-focusing criterion and flattening imaging gathers criterion) which were usually used by migration velocity analysis were unified together.Finally,based on the TSADCIGs,velocity update formulae were derived.A migration velocity analysis(MVA) workflow based on the time-shift common image gathers(TSCIG) was designed.This approach was numerically tested on synthetic and real seismic data.The numerical results demonstrated that the approach was feasible and effective for MVA.
The imaging conditions of the depth-focusing velocity analysis and residual curvature velocity analysis are firstly compared.And then the time-shift offset domain common image gathers(TSODCIGs) and time-shift angle domain common image gathers(TSADCIGs) through the space-time-shift imaging condition are presented.According to the discussion on the TSADCIGs,the two criteria(depth-focusing criterion and flattening imaging gathers criterion) which were usually used by migration velocity analysis were unified together.Finally,based on the TSADCIGs,velocity update formulae were derived.A migration velocity analysis(MVA) workflow based on the time-shift common image gathers(TSCIG) was designed.This approach was numerically tested on synthetic and real seismic data.The numerical results demonstrated that the approach was feasible and effective for MVA.
引文
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[2]Mackay S,Abma R.I maging and velocity esti mation withdepth-focusing analysis.Geophysics,1992,57(12):1608~1622
[3]Mackay S,Abma R.Depth-focusing analysis using awavefront-curvature criterion.Geophysics,1993,58(8):1148~1156
[4]Prucha M,Biondi B,Symes W.Angle-domain commoni mage gathers by wave-equtation migration.69th Ann.Internat.Mtg.,Soc.Expl.Geophys.Expanded Abstracts,1999.824~827
[5]Xu S,Chauris H,LambarG,Noble M.Common-anglemigration:a strategy for i maging complex media.Geophysics,2001,66(6):1877~1894
[6]Stolk C C,Symes W W.Kinamatic artifactsin prestack depthmigration.Geophysics,2004,69(2):562~575
[7]Xie X B,Wu R S.Extracting angle domaininformation frommigrated wavefield.72nd Ann.Internat.Mtg.,Soc.Expl.Geophys.Expanded Abstracts,2002.1360~1363
[8]陈凌,吴如山,王伟君.基于Gabor-Daubechies小波束叠前深度偏移的角度域共成像道集.地球物理学报,2004,47(5):876~885Chen L,Wu R S,Wang J W.Common angle i mage gathersobtained from gabor-daubechies beamlet prestack depthmigration.Chinese J.Geophys.(in Chinese),2004,47(5):876~885
[9]Rickett J E,Sava P C.Offset and angle-domain commoni mage-point gathers for shot-profile migration.Geophysics,2002,67(3):883~889
[10]Sava P C,Fomel S.Angle-domain common-i mage gathers bywavefield continuation methods.Geophysics,2003,68(3):1065~1074
[11]Soubaras R.Angle gathers for shot-record migration bylocalharmonic decomposition.73rd Ann.Internat.Mtg.,Soc.Expl.Geophys.Expanded Abstracts,2003.889~892
[12]Biondi B,Tisserant T.3D angle-domain common-i magegathers for migration velocity analysis.GeophysicalProspecting,2004,52:575~591
[13]刘守伟.角度域共成像点道集及偏移速度分析[博士论文].上海:同济大学,2007Liu S W.Angle domain commoni mage gathers and migrationvelocity analysis[Ph.D.thesis](in Chinese).Shanghai:Tongji University,2007
[14]Biondi B,Symes W W.Angle-domain common-i mage gathersfor migration velocity analysis by wavefield-continuationi maging.Geophysics,2004,69(5):1283~1298
[15]Biondi B,Tisserant T,Symes W W.Wavefield-continuationangle-domain common-i mage gathers for migration velocityanalysis.73rd Ann.Internat.Mtg.,Soc.Expl.Geophys..Expanded Abstracts,2003.2104~2107
[16]Sava P,Fomel S.Ti me-shift i maging condition.75th Ann.Internat.Mtg.,Soc.Expl.Geophys.Expanded Abstracts,2005.1850~1853
[17]Sava P C,Fomel S.Ti me-shift i maging condition forconverted waves.76th Ann.Internat.Mtg.,Soc.Expl.Geophys.Expanded Abstracts,2006,2460~2463
[18]Liu S W,Wang HZ.Ti me-shift depth-focusingfor migrationvelocity analysis.Internat.Geophy.Mtg.,SPG/SEG.Expanded Abstracts,2006,51~54
[19]Al-Yahya K.Velocity analysis by iterative profile migration.Geophysics,1989,54(6):718~729
[20]吴国忱,王华忠,马在田.常速度梯度射线追踪与二维层速度反演.石油物探,2003,42(4):434~440Wu G C,Wang H Z,Ma Z T.Ray tracing with constantvelocity gradient and inversion of 2-D interval velocity.Geophysical Prospecting for Petroleum(in Chinese),2003,42(4):434~440
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