零偏VSP衰减特性正反演模型试验
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摘要
当地震波在地层中传播时,能量的衰减是介质粘弹性性质的反应。这种介质所固有的衰减特性一般用品质因子Q来描述。该文研究的是零偏VSP衰减地震波长的正演模拟,在正演算法上采用了层状介质的波长递推公式,在基于"Ganley模型"的理论下模拟出了零偏VSP合成记录。为了验证正演模拟的正确性,用质心频率偏移法(Centroid Frequency Shift,简称CFS)对理论模型的Q值进行提取。模型结果表明了该文正演方法的正确性,也证明了CFS方法的实用性。
Energy attenuation is the reflection of non-elastic property of medium when seismic wave propagates in the straum,which attenuation characteristic of medium is usually represented by quality factor Q.This paper studies the forward modeling of zero-offset VSP attenuation seismic wave length,and the recursion formula of wave length in layered medium is adopted in the forward simulation arithmetic.Based on the Ganley model,the zero-offset synthesized VSP data is simulated.In order to verify the correctness of forward modeling,the centroid frequency shift method(CFS for short) is used to inverse the Q values on the forward zero-offset VSP geological model.The model results show that the correctness of forward modeling method,which also CFS method′s practicality.
Energy attenuation is the reflection of non-elastic property of medium when seismic wave propagates in the straum,which attenuation characteristic of medium is usually represented by quality factor Q.This paper studies the forward modeling of zero-offset VSP attenuation seismic wave length,and the recursion formula of wave length in layered medium is adopted in the forward simulation arithmetic.Based on the Ganley model,the zero-offset synthesized VSP data is simulated.In order to verify the correctness of forward modeling,the centroid frequency shift method(CFS for short) is used to inverse the Q values on the forward zero-offset VSP geological model.The model results show that the correctness of forward modeling method,which also CFS method′s practicality.
引文
[1]朱光明.垂直地震剖面.北京:石油工业出版社.1988
[2]贺振华,黄德济,赵宪生,等.复杂油气藏地震波场特征方法理论及应用.四川科学技术出版社,1999
[3]Dong Linping,Gary Margrave.Synthetic zero-offset VSP including attenuation[C]//CSEG National Convention,2004
[4]马昭军,刘洋.地震波衰减反演研究综述.地球物理学进展,2005(4):1074～1082
[5]赵宪生,黄德济.地震记录的Q值正演模拟与反滤波.石油地球物理勘探,1994,33(2):42～48
[6]严又生,宜明理,魏新,等.井间地震速度和Q值联合层析成像及应用.石油地球物理勘探,2001,36(1):9～17
[7]安慧,黄德济,赵宪生.VSP资料的程变反Q滤波.物探化探计算技术,1998,20(1):19～24
[8]孙雪继,杨晓.合成地震记录制作方法研究.石油地球物理勘探,1997,32(增刊2):34～39
[2]贺振华,黄德济,赵宪生,等.复杂油气藏地震波场特征方法理论及应用.四川科学技术出版社,1999
[3]Dong Linping,Gary Margrave.Synthetic zero-offset VSP including attenuation[C]//CSEG National Convention,2004
[4]马昭军,刘洋.地震波衰减反演研究综述.地球物理学进展,2005(4):1074～1082
[5]赵宪生,黄德济.地震记录的Q值正演模拟与反滤波.石油地球物理勘探,1994,33(2):42～48
[6]严又生,宜明理,魏新,等.井间地震速度和Q值联合层析成像及应用.石油地球物理勘探,2001,36(1):9～17
[7]安慧,黄德济,赵宪生.VSP资料的程变反Q滤波.物探化探计算技术,1998,20(1):19～24
[8]孙雪继,杨晓.合成地震记录制作方法研究.石油地球物理勘探,1997,32(增刊2):34～39
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