基于叠前地震道集的FVO分析方法
|
摘要
本文首先讨论了地层吸收和薄层滤波对地震波频率的影响,分析表明地层吸收和薄层时间厚度的变化都会引起中心频率向低频方向移动。然后从叠前地震资料出发,采用S变换时频分析法提出了FVO相对梯度属性的概念,推导了地震波在吸收介质中中心频率与炮检距的近似关系式;通过分析不同吸收分布模型可知,所有吸收模型的中心频率随着炮检距增大向低频方向移动;最后建立四种理论模型,基于单程波动方程数值模拟的方法得到相应的叠前CMP道集,利用频率随炮检距的变化关系提取FVO梯度属性。数值算例分析结果表明了该法能有效区分较厚的吸收介质与薄互层介质。
We discuss in the paper frequency change caused by stratum absorption and thin-layer filter,and find that both of them can cause the center frequency shifted to the lower direction.Using prestack seismic data,a new conception called FVO relative gradient is proposed based on a time-frequency S transform analysis method.And then,approximate relationship between the center frequency and offset in the absorbing media is derived.With different distribution model analysis,we have found that the center frequency of the absorption model moves toward lower frequency with offset increase.Finally,four models are built to estimate the FVO relative gradient,which is estimated from synthesis CMP gathers numerically simulated by nonzero-offset one-way wave equation.The numerical result indicates that FVO relative gradient can distinguish thick absorption medium with thin inter-bedded medium.
We discuss in the paper frequency change caused by stratum absorption and thin-layer filter,and find that both of them can cause the center frequency shifted to the lower direction.Using prestack seismic data,a new conception called FVO relative gradient is proposed based on a time-frequency S transform analysis method.And then,approximate relationship between the center frequency and offset in the absorbing media is derived.With different distribution model analysis,we have found that the center frequency of the absorption model moves toward lower frequency with offset increase.Finally,four models are built to estimate the FVO relative gradient,which is estimated from synthesis CMP gathers numerically simulated by nonzero-offset one-way wave equation.The numerical result indicates that FVO relative gradient can distinguish thick absorption medium with thin inter-bedded medium.
引文
[1]Arthur E Barnes.Instantaneous spectral bandwidthand dominant frequency with applications to seismicreflection data.Geophysics,1993,58(3):419～428
[2]Zhang Ch J,Ulrychz T J.Estimation of quality fac-tors from CMP record.Geophysics,2002,67(5):1542～1547
[3]Feng Shen,Jesus Sierraz et al.Azimuthal offset-de-pendent attributes applied to fracture detection in acarbonate reservoir.Geophysics,2002,67(2):355～364
[4]Carlos C.Can we use frequency shift due to attenua-tion for fizz water discriminationSEG TechnicalProgram Expanded Abstracts,2004,23:1630～1633
[5]Varghese A V.Attenuation estimation in crosswelldata-an indicator of fracture density and perme-abilty.71st EAGE Conference,2009
[6]Wu Rushan,Keiiti Aki.Scattering and Attenuationof Seismic Waves.Birkhuser Verlag,1990
[7]Sun Luping,ZhengXiaodong,Li Jingsong,and Shou-hao.Thin-bed thickness calculation formula and itsapproximation using peak frequency.Applied Geo-physics,2009,6(3):234～240
[8]Sheng HongTai.Local frequency as a directory hy-drocarbon indicator.SEG Technical Program Ex-panded Abstracts,2009,28:2160～2163
[9]Mazzotti A.Amplitude,phase and frequency versusoffset applications.Geophysical Prospecting 1991,39(7):863～886
[10]陈雨红,杨长春,曹齐放等.几种时频分析方法比较.地球物理学进展,2006,21(4):1180～1185Chen Yuhong,Yang Changchun,Cao Qifang et al.The comparison of some time-frequency analysismethods.Progress in Geophysics,2006,21(4):1180～1185
[11]李宏兵,赵文智,曹宏等.小波尺度域含气储层地震波衰减特征.地球物理学报,2004,47(5):892～898Li Hongbing,Zhao Wenzhi,Cao Hong et al.Charac-teristics of seismic attenuation of gas reservoirs inwavelet domain.Chinese Journal of Geophysics,2004,47(5):892～898
[12]Stockwell R G,Mansinha L and Lowe R P.Localiza-tion of the complex spectrum:The S transform.IEEE Transactions on Signal Processing,1996,44(4):998～1001
[13]李雪英,孙丹,井涌泉等.利用广义S变换进行等效Q值扫描分析.地球物理学进展,2009,24(5):1696～1702Li Xueying,Sun Dan,Jing Yongquan et al.Scanninganalysis of effective Qusing generalized S transform.Progress in Geophysics,2009,24(5):1696～1702
[14]高静怀,陈文超.广义S变换与薄互层地震响应分析.地球物理学报,2003,46(4):526～532Gao Jinghuai,Chen Wenchao et al.Generalized Stransform and seismic response analysis of thin inter-beds.Chinese Journal of Geophysics,2003,46(4):526～532
[15]Aki K,Richards P G.Quantitative Seismology,The-ory and Methods.San Francisco:W H Freeman,1980
[16]Futterman W I.Dispersive body waves.GeophysRes,1962,7(13):5279～5291
[17]Quan Y L,Harrisy J M.Seismic attenuation tomo-graphy using the frequency shift method.Geophy-sics,1997,62(3):895～905
[18]熊晓军.单程波动方程地震数值模拟新方法研究[博士学位论文].四川成都:成都理工大学,2007Xiong Xiaojun.Method Research of One-way Wave-Equation Seismic Numerical Simulation[D].Cheng-du University of Technology,2007
[19]何兵红,吴国忱等.粘弹性介质单程波法非零偏移距地震数值模拟与偏移.地球物理学进展,2009,24(4):1299～1312He Binghong,Wu Guochen et al.Viscoelastic medi-um numerical simulation and migration of non-zerooffset seismic wave by one-way wave equation.Pro-gress in Geophysecs,2009,24(4):1299～1312
[2]Zhang Ch J,Ulrychz T J.Estimation of quality fac-tors from CMP record.Geophysics,2002,67(5):1542～1547
[3]Feng Shen,Jesus Sierraz et al.Azimuthal offset-de-pendent attributes applied to fracture detection in acarbonate reservoir.Geophysics,2002,67(2):355～364
[4]Carlos C.Can we use frequency shift due to attenua-tion for fizz water discriminationSEG TechnicalProgram Expanded Abstracts,2004,23:1630～1633
[5]Varghese A V.Attenuation estimation in crosswelldata-an indicator of fracture density and perme-abilty.71st EAGE Conference,2009
[6]Wu Rushan,Keiiti Aki.Scattering and Attenuationof Seismic Waves.Birkhuser Verlag,1990
[7]Sun Luping,ZhengXiaodong,Li Jingsong,and Shou-hao.Thin-bed thickness calculation formula and itsapproximation using peak frequency.Applied Geo-physics,2009,6(3):234～240
[8]Sheng HongTai.Local frequency as a directory hy-drocarbon indicator.SEG Technical Program Ex-panded Abstracts,2009,28:2160～2163
[9]Mazzotti A.Amplitude,phase and frequency versusoffset applications.Geophysical Prospecting 1991,39(7):863～886
[10]陈雨红,杨长春,曹齐放等.几种时频分析方法比较.地球物理学进展,2006,21(4):1180～1185Chen Yuhong,Yang Changchun,Cao Qifang et al.The comparison of some time-frequency analysismethods.Progress in Geophysics,2006,21(4):1180～1185
[11]李宏兵,赵文智,曹宏等.小波尺度域含气储层地震波衰减特征.地球物理学报,2004,47(5):892～898Li Hongbing,Zhao Wenzhi,Cao Hong et al.Charac-teristics of seismic attenuation of gas reservoirs inwavelet domain.Chinese Journal of Geophysics,2004,47(5):892～898
[12]Stockwell R G,Mansinha L and Lowe R P.Localiza-tion of the complex spectrum:The S transform.IEEE Transactions on Signal Processing,1996,44(4):998～1001
[13]李雪英,孙丹,井涌泉等.利用广义S变换进行等效Q值扫描分析.地球物理学进展,2009,24(5):1696～1702Li Xueying,Sun Dan,Jing Yongquan et al.Scanninganalysis of effective Qusing generalized S transform.Progress in Geophysics,2009,24(5):1696～1702
[14]高静怀,陈文超.广义S变换与薄互层地震响应分析.地球物理学报,2003,46(4):526～532Gao Jinghuai,Chen Wenchao et al.Generalized Stransform and seismic response analysis of thin inter-beds.Chinese Journal of Geophysics,2003,46(4):526～532
[15]Aki K,Richards P G.Quantitative Seismology,The-ory and Methods.San Francisco:W H Freeman,1980
[16]Futterman W I.Dispersive body waves.GeophysRes,1962,7(13):5279～5291
[17]Quan Y L,Harrisy J M.Seismic attenuation tomo-graphy using the frequency shift method.Geophy-sics,1997,62(3):895～905
[18]熊晓军.单程波动方程地震数值模拟新方法研究[博士学位论文].四川成都:成都理工大学,2007Xiong Xiaojun.Method Research of One-way Wave-Equation Seismic Numerical Simulation[D].Cheng-du University of Technology,2007
[19]何兵红,吴国忱等.粘弹性介质单程波法非零偏移距地震数值模拟与偏移.地球物理学进展,2009,24(4):1299～1312He Binghong,Wu Guochen et al.Viscoelastic medi-um numerical simulation and migration of non-zerooffset seismic wave by one-way wave equation.Pro-gress in Geophysecs,2009,24(4):1299～1312
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