基于局部斜率属性的VSP波场分离研究
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摘要
基于垂直地震剖面(VSP)资料中上、下行波视速度的差异,利用地震剖面同相轴局部斜率属性参数,提出了一种分离上、下行波场的新方法.首先利用Fourier变换初步分离上、下行波场,然后利用平面波分解滤波器(Plane Wave Destruction(PWD)Filter)技术估计初始分离波场的同相轴局部斜率属性参数,在此基础上对VSP原始资料波场分离.该方法是一种时间域最小平方优化分离波场的方法,不存在其他滤波方法阈值滤波器边界的影响,减少了因镶边问题带来的假象.模拟和实际资料处理结果表明,该方法与传统方法相比,分离出的上、下行波噪声假象少,振幅保持好,更好地消除了上、下行波的相互影响.
Based on difference between upgoing and downgoing wavefields in verticalseismic profiling (VSP) data,a new method to separate upgoing and downgoing wavefields using local event slopes attribute is developed.In this method,we first use Fourier Transform to obtain initially separated wavefields,and then use plane wave destruction technology to estimate local event slopes of initially separated wavefields.Finally,original VSP data is separated on the basis of local event slopes.Our proposed method,which is a kind of optimization approach in time domain,doesn't have taper effects that result from window filter band and attenuates artifacts. Results of synthetic and field data examples show that,compared with conventional method, separated wavefields using local slopes are clean and amplitudes are maintained.The interference between upgoing and downgoing wavefields can be eliminated better.
Based on difference between upgoing and downgoing wavefields in verticalseismic profiling (VSP) data,a new method to separate upgoing and downgoing wavefields using local event slopes attribute is developed.In this method,we first use Fourier Transform to obtain initially separated wavefields,and then use plane wave destruction technology to estimate local event slopes of initially separated wavefields.Finally,original VSP data is separated on the basis of local event slopes.Our proposed method,which is a kind of optimization approach in time domain,doesn't have taper effects that result from window filter band and attenuates artifacts. Results of synthetic and field data examples show that,compared with conventional method, separated wavefields using local slopes are clean and amplitudes are maintained.The interference between upgoing and downgoing wavefields can be eliminated better.
引文
[1] Hardage B A.Vertical Seismic Profiling-Part 1,Principles.Pergamon Press,Inc.,1985
[2] 高静怀,杨森林,王大兴.利用VSP资料直达波的包络峰值 处瞬时频率提取介质品质因子.地球物理学报,2008,51(3) :853～861 Gao J H,Yang S I L,Wang D X.Quality factor extraction using instantaneous frequency at envelope peak of direct waves of VSP data.Chinese J.Geophys.(in Chinese),2008,51(3) :853～861
[3] 赵伟,葛艳.利用零偏移距VSP资料在小波域计算介质Q值.地球物理学报,2008,51(4) :1202～1208 Zhao W,Ge Y.Estimation of Q from VSP data with zero offset in the wavelet domain.Chinese J.Geophys.(in Chinese),2008,51(4) :1202～1208
[4] 邓继新,王尚旭,李生杰等.砂岩储层地震属性参数对孔隙流体的敏感性评价.石油学报,2006,27(6) :55～59 Deng J X,Wang S X,Li S J,et al.Sensitivity evaluation of seismic attribute paraeters for sandstone reservoir to pore fluid.Acta Petrolei Sinica(in Chinese),2006,27(6) :55～59．
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[6] 崔杰,韩立国,单刚义.含衰减的零偏移距VSP正演模拟及Q值的提取.吉林大学学报(地球科学版),2006,36(增刊):125～129 Cui J,Han L G,Shah G Y.Zero-offset VSP forward modeling including attenuation and the estimation of Q. Journal of Jilin University(Earth Science Edition)(in Chinese),2006,36(Suppl.):125～129
[7] Suprajitno M,Greenhalgh S A.Separation of upgoing and downgoing waves in vertical seismic profiling by contour-sliee filtering.Geophysics,1985,50(6) :950～962
[8] Moon W,Carswell A,Tang R,et al.Radon transform wave field separation for vertical seismic profiling data.Geophysics,1986,51(4) :940～947
[9] Freire S L M,Ulryeh T S.Application of singular value decomposition to vertical seismic profiling.Geophysics,1988,53(6) :778～785
[10] Blias E.VSP wavefield separation:Wave-by-wave optimization approach.Geophysics,2007,72(4) :47～55
[11] Blias E.Automatic 3-C 3-D VSP wavefield separation:70~(th)Annual Meeting,EAGE,Expanded Abstracts,2008
[12] 曾有良,乐友善,单启铜等.基于高分辨率Radon变换的VSP波场分离方法.石油物探,2007,46(2) :115～119
Zeng Y L,Le Y S,Shan Q T,et al.VSP wavefield separation on high resolution Radon transformation.Geophysical Prospecting for Petroleum,2007,46(2) :115～119
[13] 包乾宗,高静怀,陈文超.Curvelet域垂直地震剖面波场分离.西安交通大学学报,2007,41(6) :650～654 Bao Q Z,Gao J H,Chen W C.Wave field separation of vertical profiling in Curvelet domain.Journal of Xi'an Jiao Tong University,2007,41(6) :650～654
[14] Fomel S.Local seismic attributes.Geophysics,2007,72(3) :A29～A33
[15] Liu G C,Fomel S,Jin L,et al.Stacking seismic data using local correlation.Geophysics,2009,74(3) :V43～V48
[16] Neidell N S,Taner M T.Semblance and other coherency measures for multichannel data.Geophysics,1971,36(3) :482～497
[17] Fomel S.Application of plane-wave destruction filters.Geophysics,2002,67(6) :1946～1960
[18] Spitz S.Seismic trace interpolation in the f-x domain.Geophysics,1991,56(6) :785～794
[19] Claerbout J F.Earth Sounding analysics,Processing versus inversion.Blackwell Scientific Publications,Inc.,1992
[20] Fomel S.Poststack velocity analysis by separation and imaging of seismic diffractions.Geophysics,2007,72(6) :84～94
[21] Fomel S.Velocity-independent time-domain seismic imaging using local event slops.Geophysics,2007,72(3) :139～147
[22] Fomel S,Guitton A.Regularization seismic inverse problems by model reparameterization using plane-wave construction.Geophysics,2006,71(5) :43～47
[2] 高静怀,杨森林,王大兴.利用VSP资料直达波的包络峰值 处瞬时频率提取介质品质因子.地球物理学报,2008,51(3) :853～861 Gao J H,Yang S I L,Wang D X.Quality factor extraction using instantaneous frequency at envelope peak of direct waves of VSP data.Chinese J.Geophys.(in Chinese),2008,51(3) :853～861
[3] 赵伟,葛艳.利用零偏移距VSP资料在小波域计算介质Q值.地球物理学报,2008,51(4) :1202～1208 Zhao W,Ge Y.Estimation of Q from VSP data with zero offset in the wavelet domain.Chinese J.Geophys.(in Chinese),2008,51(4) :1202～1208
[4] 邓继新,王尚旭,李生杰等.砂岩储层地震属性参数对孔隙流体的敏感性评价.石油学报,2006,27(6) :55～59 Deng J X,Wang S X,Li S J,et al.Sensitivity evaluation of seismic attribute paraeters for sandstone reservoir to pore fluid.Acta Petrolei Sinica(in Chinese),2006,27(6) :55～59．
[5] 李景叶,陈小宏.基于地震资料的储层流体识别.石油学报,2008,29(2) :235～238 Li J Y,Chen X H.Reservoir fluid identification hased on seismic data.Acta Petrolei Sinica(in Chinese),2008,29(2) :235～238
[6] 崔杰,韩立国,单刚义.含衰减的零偏移距VSP正演模拟及Q值的提取.吉林大学学报(地球科学版),2006,36(增刊):125～129 Cui J,Han L G,Shah G Y.Zero-offset VSP forward modeling including attenuation and the estimation of Q. Journal of Jilin University(Earth Science Edition)(in Chinese),2006,36(Suppl.):125～129
[7] Suprajitno M,Greenhalgh S A.Separation of upgoing and downgoing waves in vertical seismic profiling by contour-sliee filtering.Geophysics,1985,50(6) :950～962
[8] Moon W,Carswell A,Tang R,et al.Radon transform wave field separation for vertical seismic profiling data.Geophysics,1986,51(4) :940～947
[9] Freire S L M,Ulryeh T S.Application of singular value decomposition to vertical seismic profiling.Geophysics,1988,53(6) :778～785
[10] Blias E.VSP wavefield separation:Wave-by-wave optimization approach.Geophysics,2007,72(4) :47～55
[11] Blias E.Automatic 3-C 3-D VSP wavefield separation:70~(th)Annual Meeting,EAGE,Expanded Abstracts,2008
[12] 曾有良,乐友善,单启铜等.基于高分辨率Radon变换的VSP波场分离方法.石油物探,2007,46(2) :115～119
Zeng Y L,Le Y S,Shan Q T,et al.VSP wavefield separation on high resolution Radon transformation.Geophysical Prospecting for Petroleum,2007,46(2) :115～119
[13] 包乾宗,高静怀,陈文超.Curvelet域垂直地震剖面波场分离.西安交通大学学报,2007,41(6) :650～654 Bao Q Z,Gao J H,Chen W C.Wave field separation of vertical profiling in Curvelet domain.Journal of Xi'an Jiao Tong University,2007,41(6) :650～654
[14] Fomel S.Local seismic attributes.Geophysics,2007,72(3) :A29～A33
[15] Liu G C,Fomel S,Jin L,et al.Stacking seismic data using local correlation.Geophysics,2009,74(3) :V43～V48
[16] Neidell N S,Taner M T.Semblance and other coherency measures for multichannel data.Geophysics,1971,36(3) :482～497
[17] Fomel S.Application of plane-wave destruction filters.Geophysics,2002,67(6) :1946～1960
[18] Spitz S.Seismic trace interpolation in the f-x domain.Geophysics,1991,56(6) :785～794
[19] Claerbout J F.Earth Sounding analysics,Processing versus inversion.Blackwell Scientific Publications,Inc.,1992
[20] Fomel S.Poststack velocity analysis by separation and imaging of seismic diffractions.Geophysics,2007,72(6) :84～94
[21] Fomel S.Velocity-independent time-domain seismic imaging using local event slops.Geophysics,2007,72(3) :139～147
[22] Fomel S,Guitton A.Regularization seismic inverse problems by model reparameterization using plane-wave construction.Geophysics,2006,71(5) :43～47
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