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山前带逆掩构造保幅ffd叠前深度偏移

Keywords: 山前带,逆掩构造,单程波方程,保幅偏移,ffd

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Abstract:

?山前带逆掩构造区上覆高速地层对地震波传播能量具有比较严重的屏蔽作用,因而导致逆掩下伏构造成像比较困难。如今广泛采用的kirchhoff积分法叠前深度偏移由于其自身算法的限制难以对其精确成像。基于此,本文引入了保幅ffd(傅里叶有限差分)叠前深度偏移方法,通过在传统延拓算子的基础上增加振幅恢复项求得保幅延拓算子,并给出保幅偏移的成像条件,从而实现了保幅ffd叠前深度偏移。数值试验及实际资料处理结果均表明:该方法能够有效补偿地震波场传播中的能量损失,提高逆掩下伏构造的成像质量。

References

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[4]  ristowdandrutht.fouricrfinite-differencemi-gration.cieophysics,1994,59(12):1882-1893
[5]  zhangy,zhangu,blcistcinn.trueamplitudewaveequationmigrationarisingfromtrueamplitudeone-wayequations[j].inverseproblems.2003,19:1113-1138
[6]  zhangy,zhangg,blcistcinn.theoryoftrueam-plitudeone-waywaveequationsandtrueamplitudecommonshotmigration.geophysics,2005,70(3):e1-e10
[7]  吕彬,王西文,王宇超等.基于保真振幅单程波方程的叠前.avp成像方法.地球物理学报,2009,52(8);2119-2127lubin,wangxi-wen,wangyu-chaoetal.prestackavpimagingmethodbasedontrueamplitudeone-waywaveequation.chinesejournalofgeophysics,2009,52(8):2119-2127
[8]  gazdagj.waveequationwithphase-shiftmethod[j].geophysics.1978,43(7):1342-1351
[9]  stoffapl.split-stepfouriermigration[j].geophysics.1990,55(4):410-421
[10]  王西文.地震数据连片处理中静校正建模方法的研究及应用.石油地球物理勘探,2006,41(4);375-382wangxi-wen.modelbuildingmethodofstaticcor-rectioninseismicdatapieces-jointedprocessing.ogp,2006,41(4):375-382
[11]  程玖兵,马在田,陶正喜等.山前带复杂构造成像方法研究.石油地球物理勘探,2006,41(5);525-529chengjiu-bing,mazai-tian,taozheng-xietal,lm-agingstudyofpiedmontcomplexstructures.ogp,2006,41(5):525-529
[12]  samuelh,grayetal.seismicmigrationproblemsandsolutions[j].goephysics.2001,66(5):1622-1640
[13]  zhangy,xus,zhangg,bleistcinn.howtoo6-tarotrueamplitudecommon-anglegathersfromone-waywaveequationmigration?segtechnicalpro-gramexpandedabstracts,2004,23:1021-1024
[14]  刘东奇,崔兴福,张关泉.波动方程混合法真振幅偏移.石油地球物理勘探,2004,39(3);283-286liudong-qi,cuixing-fu,ghanguuan-quan.true-amplitudemigrationofwaveequationhybridmethod.,2004,39(3);283-286
[15]  张关泉.波动方程的上行波方程和下行波的藕合方程组.应用数学学报,1993,16(2);251-263zhangguan-quan.systemofcoupledequationsfordowngoingandupcomingwaves.actamathapplsinica,1993,16(2):251-263

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