含衰减的零偏移距VSP正演模拟及Q值的提取
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摘要
VSP资料的特点是信噪比高,分辨率高,勘探范围小;三维地震资料勘探范围大,信噪比分辨率却低于VSP资料。因此最佳勘探方式是实施井中(VSP和井间地震)地震方法与地面地震数据联合采集与处理的方式,利用井中资料的分辨率来拓展地面地震分辨率。本文研究的是含衰减零偏移距VSP地震波场正演模拟,为利用VSP资料提取衰减信息,拓展三维地震频带提供基础理论数据。在正演模拟算法上采用了层状介质构造的波场递推理论,通过一系列理论地质模型模拟了零偏移距VSP合成记录,同时为了验证所做的正演模拟的正确性,用谱比法对理论模型中的Q值进行了提取。
The characters of the VSP data are high S/N and resolution,and the exploration range is small.The 3D seismic data has a large exploration range but its S/N and resolution are lower than the VSP data.The best exploration method is the combined seismic acquisition and processing method including the well(VSP and cross well seismic)seismic method and the ground seismic data,using the resolution of the well data to expand the ground seismic data's resolution.This paper researches the zero offset VSP seismic wave fields forward simulation including attenuation,and uses VSP data to extract the attenuation information,provides the basic theory data to expand the frequency range of the 3D seismic data.We introduce the wave field recursion theory of the layered medium structure in the forward simulation arithmetic.Thorough a series of theoretical geology model we simulate the zero—offset synthesized VSP data.At the same time in order to validate the correctness of our forward modeling,we estimate seismic attenuation by an spectral ratio method.
The characters of the VSP data are high S/N and resolution,and the exploration range is small.The 3D seismic data has a large exploration range but its S/N and resolution are lower than the VSP data.The best exploration method is the combined seismic acquisition and processing method including the well(VSP and cross well seismic)seismic method and the ground seismic data,using the resolution of the well data to expand the ground seismic data's resolution.This paper researches the zero offset VSP seismic wave fields forward simulation including attenuation,and uses VSP data to extract the attenuation information,provides the basic theory data to expand the frequency range of the 3D seismic data.We introduce the wave field recursion theory of the layered medium structure in the forward simulation arithmetic.Thorough a series of theoretical geology model we simulate the zero—offset synthesized VSP data.At the same time in order to validate the correctness of our forward modeling,we estimate seismic attenuation by an spectral ratio method.
引文
[1]DONG Lin-ping,Gary Margrave.Synthetic zero—offset VSP including attenuation [C]//CSEG National Convention,2004.
[2]Tommy Tocerud,Bjorn Ursin.Comparision of seis- mic attenuation models using vertical seismic profiling (VSP) data[J].Geophysics,2005,70(2):17—25.
[3]朱光明．垂直地震剖面[M]．北京；石油工业出版社，1988．
[4]郭建．VSP技术应用现状及发展趋势[J]．勘探地球物理进展，2004，27(1)：1-8．
[5]Arnim B,Haase,Robert R.CREWES:estimating seisimic atteuation (Q)by an analytical signal method [C]//CSEG National Convention,2005:359-362.
[6]Ganley D C.A method for calculating synthetic seismograms which include the effects of absorption and dispersion [J].Geophysics,1981,46 (8):1100- 1107.
[7]何樵登，熊维纲，蔡成国，等．应用地球物理教程[M]．北京：地质出版社，1991．
[8]朱定，陈国俊，蔡成国，等．利用VSP直达波资料反演粘弹介质的相速度及品质因子[J]．勘探地球物理进展，2004，27(5)：337-342．
[2]Tommy Tocerud,Bjorn Ursin.Comparision of seis- mic attenuation models using vertical seismic profiling (VSP) data[J].Geophysics,2005,70(2):17—25.
[3]朱光明．垂直地震剖面[M]．北京；石油工业出版社，1988．
[4]郭建．VSP技术应用现状及发展趋势[J]．勘探地球物理进展，2004，27(1)：1-8．
[5]Arnim B,Haase,Robert R.CREWES:estimating seisimic atteuation (Q)by an analytical signal method [C]//CSEG National Convention,2005:359-362.
[6]Ganley D C.A method for calculating synthetic seismograms which include the effects of absorption and dispersion [J].Geophysics,1981,46 (8):1100- 1107.
[7]何樵登，熊维纲，蔡成国，等．应用地球物理教程[M]．北京：地质出版社，1991．
[8]朱定，陈国俊，蔡成国，等．利用VSP直达波资料反演粘弹介质的相速度及品质因子[J]．勘探地球物理进展，2004，27(5)：337-342．
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