基于非固定算子相移法三维VSP叠前深度偏移
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摘要
地面地震成像方法很多且比较成熟,但对于三维VSP来说较成熟的成像方法很少,其成像效果特别是陆上不够理想。针对应用传统VSP成像方法如:VSP-CDP、克希霍夫积分法等成像过程中存在保幅性差、对复杂构造的归位不准、分辨率低等问题,采用非固定相移算子的叠前深度偏移方法能够适应介质速度横向变化,同时克服了常规相移偏移算法中要求速度横向不变的缺点。该方法运用基于非固定滤波器理论的非固定相移算子,具有更高的精度和稳定性,叠前深度偏移算法采取分片均匀近似的策略提高了运算速度。该方法应用于三维VSP成像并在胜利垦71井区实际资料处理中取得了比较好的成像效果。
Surface seismic imaging were of great varieties and mature, but for 3D VSP, there were less mature imaging method, especially its imaging effect was not ideal in land operation. In consideration of the problems of poor amplitude, non-accurate homing in complex structures and low resolution in traditional VSP imaging methods, such as VSP-CDP and Kirchhoff's integrating method. Pre-stack depth shift of non-stationary phase-shift operator could satisfy the lateral variation of medium velocity, the shortcomings of unchanges of lateral velocity were avoided in traditional phase-shift method. The method has higher precision and steability in non-stationary phase shift in non-stationary filter-based theory. Operation speed is improved by using pre-stack depth migration with piecenise constant approximation. The method is used for data process in Well Block Ken 71 of Shengli Oilfield for 3DVSP imaging and better effect is achieved.
Surface seismic imaging were of great varieties and mature, but for 3D VSP, there were less mature imaging method, especially its imaging effect was not ideal in land operation. In consideration of the problems of poor amplitude, non-accurate homing in complex structures and low resolution in traditional VSP imaging methods, such as VSP-CDP and Kirchhoff's integrating method. Pre-stack depth shift of non-stationary phase-shift operator could satisfy the lateral variation of medium velocity, the shortcomings of unchanges of lateral velocity were avoided in traditional phase-shift method. The method has higher precision and steability in non-stationary phase shift in non-stationary filter-based theory. Operation speed is improved by using pre-stack depth migration with piecenise constant approximation. The method is used for data process in Well Block Ken 71 of Shengli Oilfield for 3DVSP imaging and better effect is achieved.
引文
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[5]Ferguson RJ,Margrave G F.Prestack depth migration by symmetric nonstationary phase shit method[J].Geophysics,2002,67(2):594~603.
[6]梁运基,肖都建,闫有平等.泌阳凹陷井地联合3D-VSP采集方法探讨[J].河南石油,2006,20(3):14~16.
[7]李云龙,严又生,白俊辉等.轮古38井三维VSP数据采集方法探讨[J].石油物探,2006,45(3):299~304.
[8]王成礼,焦湘恒.变偏移距VSP方法与效果——N35井实例的研究[J].石油物探,1992,31(4):11~22.
[9]姚忠瑞,何惺华,左建军等.多方位Walk-away VSP处理方法[J].石油物探,2006,45(4):380~385.
[10]姚忠瑞,孙卫国,何惺华.三维三分量Walk-away VSP处理方法及效果分析[J].石油天然气学报,2005,27(6):902~905.
[2]Margrave G F,Ferguson KJ.An explicit symmetric wavefield extrapolator for depth migrations[A].69th Ann.Internat Mtg Soc Expl-Geophys,Expanded Abstract[C].1999.1461~1464.
[3]Gazdag J,Sguazerro P.Migration of seismic data by phase shift plus interpolations[J].Geophysics,1984,49(1):124~131.
[4]Stein E M.Harmonic analysis:Reel-variable methods,orthogonality,and oscillatoryintegrals[M].Princeton:Princeton Univ.Press,1993.234~240.
[5]Ferguson RJ,Margrave G F.Prestack depth migration by symmetric nonstationary phase shit method[J].Geophysics,2002,67(2):594~603.
[6]梁运基,肖都建,闫有平等.泌阳凹陷井地联合3D-VSP采集方法探讨[J].河南石油,2006,20(3):14~16.
[7]李云龙,严又生,白俊辉等.轮古38井三维VSP数据采集方法探讨[J].石油物探,2006,45(3):299~304.
[8]王成礼,焦湘恒.变偏移距VSP方法与效果——N35井实例的研究[J].石油物探,1992,31(4):11~22.
[9]姚忠瑞,何惺华,左建军等.多方位Walk-away VSP处理方法[J].石油物探,2006,45(4):380~385.
[10]姚忠瑞,孙卫国,何惺华.三维三分量Walk-away VSP处理方法及效果分析[J].石油天然气学报,2005,27(6):902~905.
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