利用双井微测井资料估算近地表Q值
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摘要
品质因子Q本身反映了地表层的岩石物理特性,但表层Q值的求取一直是研究难点。利用表层模型反演及面波衰减的Q模型可反演出近地表Q值,但求取的表层Q值精度不够,不能满足高精度地震勘探的需要。本文提出了一种利用双井微测井资料估算近地表Q值的方法,通过建立求解地面和井下检波器的峰值频率变化方程组,获得了近地表Q值的解析解。利用大庆油田实际资料对文中方法进行验算的结果表明,算法稳定,计算的表层Q值合理,用反Q滤波可以在时间、频率和空间三个域内有效地消除近地表影响,尤其是对地震信号相位的影响,提高了地震资料的分辨率。
Quality factor Q itself reflects the rock physical properties of near surface layer,however the estimation of Q value for the near surface layer has been always a difficult point in the research.The near surface Q value can be inverted either by near surface model inversion or by ground wave attenuation Q model,but its accuracy is not enough and can not meet the need of high accuracy seismic exploration.A near surface Q value method based on the datasets of the uphole survey in double hole was proposed in this paper,by building and solving the equation group which describes the peak value changing for the surface geophones and downhole geophones,the analytic solution for the near surface Q value was acquired.The testing results for the method based on field datasets from Daqing Oilfield show that the algorithm is stable,acuired Q value is reasonable,the reverse Q filtering using the acquired Q value could effectively eliminate near surface affects in time,frequency and space domain,especially the affect from the seismic signal phase,so the seismic resolution was raised.
Quality factor Q itself reflects the rock physical properties of near surface layer,however the estimation of Q value for the near surface layer has been always a difficult point in the research.The near surface Q value can be inverted either by near surface model inversion or by ground wave attenuation Q model,but its accuracy is not enough and can not meet the need of high accuracy seismic exploration.A near surface Q value method based on the datasets of the uphole survey in double hole was proposed in this paper,by building and solving the equation group which describes the peak value changing for the surface geophones and downhole geophones,the analytic solution for the near surface Q value was acquired.The testing results for the method based on field datasets from Daqing Oilfield show that the algorithm is stable,acuired Q value is reasonable,the reverse Q filtering using the acquired Q value could effectively eliminate near surface affects in time,frequency and space domain,especially the affect from the seismic signal phase,so the seismic resolution was raised.
引文
[1]李天树,陈宝德,苏德仁.双井微测井技术在表层结构调查中的应用.石油物探,2004,43(5):471~474Li Tian-shu,Chen Bao-de,Su De-ren.Application oftwin-well microlog in near surface investigation.GPP,2004,43(5):471~474
[2]王永卓,杜桂锋,傅朝奎,周志才.虚反射面对地震激发效果的影响分析及其应用.地球物理学进展,2009,24(4):1454~1460Wang Yong-zhuo,Du Gui-feng,Fu Chao-kui,Zhou Zhi-cai.Influence analysis of ghosting interface on seismicshooting effect and its application.Progress in Geo-physics,2009,24(4):1454~1460
[3]凌云,高军,吴琳.时频空间域球面发散与吸收补偿.石油地球物理勘探,2005,40(2):176~182Ling Yun,Gao Jun,Wu Lin.Compensation for spheri-cal dispersion and absorption in time-frequency-spacedomain.OGP,2005,40(2):176~182
[4]Nizare El Y,Fabian E,Wim Mulder.Near-surface at-tenuation estimation using wave-propagation modeling.Geophysics,2008,73(6):27~37
[5]裴江云,陈树民,刘振宽.近地表Q值求取及振幅补偿.地球物理学进展,2001,16(4)18~22Pei Jiang-yun,Chen Shu-min,Liu Zhen-kuan.Near sur-faceQvalue extraction and amplitude compensation.Progress in Geophysics,2001,16(4):18~22
[6]Zhang C J,Tadeusz J U.Estimation of quality factorsfrom CMP records.Geophysics,2002,67(5):1542~1547
[7]屠宁,陆文凯.一种改进的利用频移估计Q值的方法.CPS/SEG北京2009国际地球物理会议暨展览,1218Tu Ning,Lu Wen-kai.An improved peak-frequency-shift method forQestimation.CPS/SEG Beijing 2009International Geophysical conference&Exposition,1218
[8]Wang Y H.InverseQ-filter for seismic resolution en-hancement.Geophysics,2006,71(3):51~60
[2]王永卓,杜桂锋,傅朝奎,周志才.虚反射面对地震激发效果的影响分析及其应用.地球物理学进展,2009,24(4):1454~1460Wang Yong-zhuo,Du Gui-feng,Fu Chao-kui,Zhou Zhi-cai.Influence analysis of ghosting interface on seismicshooting effect and its application.Progress in Geo-physics,2009,24(4):1454~1460
[3]凌云,高军,吴琳.时频空间域球面发散与吸收补偿.石油地球物理勘探,2005,40(2):176~182Ling Yun,Gao Jun,Wu Lin.Compensation for spheri-cal dispersion and absorption in time-frequency-spacedomain.OGP,2005,40(2):176~182
[4]Nizare El Y,Fabian E,Wim Mulder.Near-surface at-tenuation estimation using wave-propagation modeling.Geophysics,2008,73(6):27~37
[5]裴江云,陈树民,刘振宽.近地表Q值求取及振幅补偿.地球物理学进展,2001,16(4)18~22Pei Jiang-yun,Chen Shu-min,Liu Zhen-kuan.Near sur-faceQvalue extraction and amplitude compensation.Progress in Geophysics,2001,16(4):18~22
[6]Zhang C J,Tadeusz J U.Estimation of quality factorsfrom CMP records.Geophysics,2002,67(5):1542~1547
[7]屠宁,陆文凯.一种改进的利用频移估计Q值的方法.CPS/SEG北京2009国际地球物理会议暨展览,1218Tu Ning,Lu Wen-kai.An improved peak-frequency-shift method forQestimation.CPS/SEG Beijing 2009International Geophysical conference&Exposition,1218
[8]Wang Y H.InverseQ-filter for seismic resolution en-hancement.Geophysics,2006,71(3):51~60
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