三维逐层层速度反演方法及误差分析
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摘要
目前 ,二维工区的地震速度研究主要在二维空间进行 ,不适用于大倾角地区。由于实际地下介质是三维的 ,本文提出适用于二维工区的三维逐层层速度反演方法 ,并据此层速度计算法射线方向和铅垂方向的平均速度及均方根速度。合成数据及实际数据计算结果表明 ,此方法是一种有效的实用方法。文中还对本方法反演的层速度与井中层速度的差异进行了分析 ,并给出了相应的校正方法。
At present, the study of seismic velocity in 2D area is mainly done in the 2D space, and is not suitable for the large dip area because the media underground is three dimensional. In this paper, a 3D inversion method of layer by layer interval velocity is advanced, which can be applicable to 2D area. At the same time,the average velocities and RMS velocities in normal ray direction and plumb direction can be computed with the interval velocity. The computed results using synthesis data and real data demonstrate that the method is an effective and practical method. Furthermore, the error between the interval velocity inverted by the method and the velocity in well is also analyzed, and the correction method is also put forward corresponding to the error. [WT5”HZ]
At present, the study of seismic velocity in 2D area is mainly done in the 2D space, and is not suitable for the large dip area because the media underground is three dimensional. In this paper, a 3D inversion method of layer by layer interval velocity is advanced, which can be applicable to 2D area. At the same time,the average velocities and RMS velocities in normal ray direction and plumb direction can be computed with the interval velocity. The computed results using synthesis data and real data demonstrate that the method is an effective and practical method. Furthermore, the error between the interval velocity inverted by the method and the velocity in well is also analyzed, and the correction method is also put forward corresponding to the error. [WT5”HZ]
引文
1 贺振华 ,黄德济 ,胡光岷 ,等 .复杂油气藏地震波场特征方法理论及应用 .成都 :四川科学技术出版社 ,1999
2 贺振华主编 .反射地震资料偏移处理与反演方法 .重庆 :重庆大学出版社 ,1989
3 徐常练 .复杂介质中的波场运动学特征及参数反演 .石油地球物理勘探 ,1998,33(增 1) :134～140
4 TsvankinI&ThomsenL .Inversionofreflectiontraveltimesfortransverseisotropy .Geophysics,1995,60 ( 4 ) :10 95～ 110 7
5 LarryRLines .Thecomparisononmodernmethodsofvelocityanalysisbasedonmodel.TheLeadingEdge ,July ,1993
6 Al Chalabi.Onseismicvelocity .FirstBreak ,1994 ,12 ( 12 )
2 贺振华主编 .反射地震资料偏移处理与反演方法 .重庆 :重庆大学出版社 ,1989
3 徐常练 .复杂介质中的波场运动学特征及参数反演 .石油地球物理勘探 ,1998,33(增 1) :134～140
4 TsvankinI&ThomsenL .Inversionofreflectiontraveltimesfortransverseisotropy .Geophysics,1995,60 ( 4 ) :10 95～ 110 7
5 LarryRLines .Thecomparisononmodernmethodsofvelocityanalysisbasedonmodel.TheLeadingEdge ,July ,1993
6 Al Chalabi.Onseismicvelocity .FirstBreak ,1994 ,12 ( 12 )
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