基于角道集剩余曲率分析的层析速度建模
|
摘要
中深层地下构造由于地震波场复杂、覆盖次数不足、信噪比低及有效反射较弱等原因造成速度建模精度低,进而影响了深度偏移质量。为此,本文提出一种中深层层析方法:利用角道集作为速度分析道集,推导了基于剩余曲率的层析建模方程,并将角道集的剩余曲率沿射线路径反投影进行速度更新。该方法既避免了常规反射层析在低信噪比叠前数据上同相轴拾取困难的问题,又无须在射线追踪中进行试射以拟合炮检点坐标,具有较高的反演精度。模型试算和实际数据处理结果均验证了方法的有效性。
In middle and deep subsurface layers,complex wavefield,low fold,low S/N,and weak reflection may cause poor accuracy of velocity model building,thereby affecting depth migration quality.We propose in this paper a new tomography velocity model building method for middle and deep structure.Using angle domain common imaging gathers(ADCIGs)in velocity analysis,we deduce tomography model building equations based on residual curvature,and back project the residual curvature of ADCIGs along ray paths to get velocity update.This method avoids both difficult event picking from low S/N prestack data in conventional reflection tomography and ray tracing to fit source and receiver coordinates.So it can obtain high inversion accuracy.Model and real dataset test results verify the correctness and validity of the proposed tomography method.
In middle and deep subsurface layers,complex wavefield,low fold,low S/N,and weak reflection may cause poor accuracy of velocity model building,thereby affecting depth migration quality.We propose in this paper a new tomography velocity model building method for middle and deep structure.Using angle domain common imaging gathers(ADCIGs)in velocity analysis,we deduce tomography model building equations based on residual curvature,and back project the residual curvature of ADCIGs along ray paths to get velocity update.This method avoids both difficult event picking from low S/N prestack data in conventional reflection tomography and ray tracing to fit source and receiver coordinates.So it can obtain high inversion accuracy.Model and real dataset test results verify the correctness and validity of the proposed tomography method.
引文
[1]秦宁,李振春,杨晓东.基于角道集的井约束层析速度反演.石油地球物理勘探,2011,46(5):725-731.Qin Ning,Li Zhenchun and Yang Xiaodong.Tomography velocity inversion by well constraint based on the angle domain common imaging gathers.OGP,2011,46(5):725-731.
[2]秦宁,李振春,杨晓东等.自动拾取的成像空间域走时层析速度反演.石油地球物理勘探,2012,47(3):392-398.Qin Ning,Li Zhenchun,Yang Xiaodong et al.Image domain travel-time tomography velocity inversion based on automatic picking.OGP,2012,47(3):392-398.
[3]Stolk C C,Symes W W.Kinematic artifacts in prestack depth migration.Geophysics,2004,69(5):562-575.
[4]Prucha M L,Biondi B,Symes W W.Angle-domain common image gathers by wave-equation migration.SEG Technical Program Expanded Abstracts,1999,18:824-827.
[5]Rickett J,Sava P.Offset and angle-domain common image-point gathers for shot profile migration.Geophysics,2002,67(3):883-889.
[6]Stork C,Kitchenside P,Yingst D.Comparison between angle and offset gathers from wave equation migration and Kirchhoff migration.SEG Technical Program Expanded Abstracts,2002,21:1200-1203.
[7]Fomel S.Theory of 3-D angle gathers in wave-equation imaging.SEG Technical Program Expanded Abstracts,2004,23:1053-1056.
[8]Reshef M.Interval velocity analysis in the dip-angle domain.Geophysics,2008,73(5):353-360.
[9]Shragge J.Angle-domain common-image gathers in generalized coordinates.Geophysics,2009,74(4):47-56.
[10]Xu Sheng,Zhang Yu,Tang Bing.3Dcommon image gathers from Reverse time migration.SEG Technical Program Expanded Abstracts,2010,29:3257-3262.
[11]Zhang Yu,Xu Sheng,Tang Bing.Angle gathers from reverse time migration.The Leading Edge,2010,29(11):1364-1371.
[12]Biondi B.Velocity estimation by image focusing analysis.Geophysics,2010,75(6):49-60.
[13]Clapp R,Biondi B.Tau domain migration velocity analysis using angle CRP gathers and geologic constraints.SEG Technical Program Expanded Abstracts,2000,19:926-929.
[14]Liu W,Popovici A,Bevc D.3D migration velocity analysis for common image gathers in the reflection angle domain.SEG Technical Program Expanded Abstracts,2001,20:885-888.
[15]Mosher C C,Jin S W,Foster D J.Migration velocity analysis using common angle image gathers.SEG Technical Program Expanded Abstracts,2001,20:889-892.
[16]Biondi B,Symes W W.Angle-domain common-image gathers for migration velocity analysis by wavefiedcontionuation imaging.Geophysics,2004,69(5):1283-1298.
[17]Sava P,Biondi B,Etgen J.Wave-equation migration velocity analysis by focusing diffractions and reflections.Geophysics,2005,70(3):U19-U27.
[18]Xia Fan,Ren Y Q,Jin S W.Residual migration velocity analysis using common angle imaging gathers.SEG Technical Program Expanded Abstracts,2006,25:2455-2459.
[19]Yang Tongning,Sava P.Wave-equation migration velocity analysis with extended common-image-point gathers.SEG Technical Program Expanded Abstracts,2010,29:4369-4374.
[20]Liu Shouwei,Wang Huazhong.Time-shift Angle Domain Common Image Gathers for Migration Velocity Analysis.SEG Technical Program Expanded Abstracts,2007,26:2797-2801.
[21]秦宁,李振春,杨晓东等.共散射点道集与角道集串级优化叠前偏移速度分析.吉林大学学报(地球科学版),2013,43(2):623-631.Qin Ning,Li Zhenchun,Yang Xiaodong et al.Prestack migration velocity analysis based on sequent optimization of common scattering point gathers and angle domain common imaging gathers.Journal of Jilin University(Earth Science Edition),2013,43(2):623-631.
[2]秦宁,李振春,杨晓东等.自动拾取的成像空间域走时层析速度反演.石油地球物理勘探,2012,47(3):392-398.Qin Ning,Li Zhenchun,Yang Xiaodong et al.Image domain travel-time tomography velocity inversion based on automatic picking.OGP,2012,47(3):392-398.
[3]Stolk C C,Symes W W.Kinematic artifacts in prestack depth migration.Geophysics,2004,69(5):562-575.
[4]Prucha M L,Biondi B,Symes W W.Angle-domain common image gathers by wave-equation migration.SEG Technical Program Expanded Abstracts,1999,18:824-827.
[5]Rickett J,Sava P.Offset and angle-domain common image-point gathers for shot profile migration.Geophysics,2002,67(3):883-889.
[6]Stork C,Kitchenside P,Yingst D.Comparison between angle and offset gathers from wave equation migration and Kirchhoff migration.SEG Technical Program Expanded Abstracts,2002,21:1200-1203.
[7]Fomel S.Theory of 3-D angle gathers in wave-equation imaging.SEG Technical Program Expanded Abstracts,2004,23:1053-1056.
[8]Reshef M.Interval velocity analysis in the dip-angle domain.Geophysics,2008,73(5):353-360.
[9]Shragge J.Angle-domain common-image gathers in generalized coordinates.Geophysics,2009,74(4):47-56.
[10]Xu Sheng,Zhang Yu,Tang Bing.3Dcommon image gathers from Reverse time migration.SEG Technical Program Expanded Abstracts,2010,29:3257-3262.
[11]Zhang Yu,Xu Sheng,Tang Bing.Angle gathers from reverse time migration.The Leading Edge,2010,29(11):1364-1371.
[12]Biondi B.Velocity estimation by image focusing analysis.Geophysics,2010,75(6):49-60.
[13]Clapp R,Biondi B.Tau domain migration velocity analysis using angle CRP gathers and geologic constraints.SEG Technical Program Expanded Abstracts,2000,19:926-929.
[14]Liu W,Popovici A,Bevc D.3D migration velocity analysis for common image gathers in the reflection angle domain.SEG Technical Program Expanded Abstracts,2001,20:885-888.
[15]Mosher C C,Jin S W,Foster D J.Migration velocity analysis using common angle image gathers.SEG Technical Program Expanded Abstracts,2001,20:889-892.
[16]Biondi B,Symes W W.Angle-domain common-image gathers for migration velocity analysis by wavefiedcontionuation imaging.Geophysics,2004,69(5):1283-1298.
[17]Sava P,Biondi B,Etgen J.Wave-equation migration velocity analysis by focusing diffractions and reflections.Geophysics,2005,70(3):U19-U27.
[18]Xia Fan,Ren Y Q,Jin S W.Residual migration velocity analysis using common angle imaging gathers.SEG Technical Program Expanded Abstracts,2006,25:2455-2459.
[19]Yang Tongning,Sava P.Wave-equation migration velocity analysis with extended common-image-point gathers.SEG Technical Program Expanded Abstracts,2010,29:4369-4374.
[20]Liu Shouwei,Wang Huazhong.Time-shift Angle Domain Common Image Gathers for Migration Velocity Analysis.SEG Technical Program Expanded Abstracts,2007,26:2797-2801.
[21]秦宁,李振春,杨晓东等.共散射点道集与角道集串级优化叠前偏移速度分析.吉林大学学报(地球科学版),2013,43(2):623-631.Qin Ning,Li Zhenchun,Yang Xiaodong et al.Prestack migration velocity analysis based on sequent optimization of common scattering point gathers and angle domain common imaging gathers.Journal of Jilin University(Earth Science Edition),2013,43(2):623-631.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心