VTI介质多参数地震走时层析成像方法研究
首发时间:2013-03-06
摘要:本文基于球谐展开群速度表达式计算走时关于各向异性参数的Fréchet核函数,利用共轭梯度法进行VTI介质中多参数联合反演。我们考虑了两种参数化方法。经过理论分析和数值试验,我们得出:与经典的Thomsen参数化方法相比较,垂直慢度,水平慢度,以及动校正慢度的参数化方法更有利于多参数联合走时层析。为了克服 参数在物理上对走时的不敏感性,我们采用了两步法来做双参数反演,理论模型实验反演得到了与垂直速度精度相当的。可以将两步法扩展到三步法以同时反演各向异性介质中的三个参数,数值实验展示了该策略的应用潜力。
关键词: 固体地球物理 各向异性介质 Fréchet核函数 参数化 联合层析
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Joint inversion of VTI parameters using nonlinear traveltime tomography
Abstract:In this paper, we use a nonlinear tomographic method to jointly invert the multiple parameters in VTI media. It is based on the harmonic series of group velocity to calculate the Fréchet kernels of traveltime respect to model parameters. Two parameterizations are used. Through theoretically analysis and numerical experiments, we find that the parameterization of vertical slowness, horizontal slowness, and NMO slowness is more appropriate for joint traveltime tomography, compared with the original Thomsen parameterization. To overcome the physical weak influence of epsilon on traveltime, a double-round strategy is employed in double-parameter inversion, through which epsilon as well as vertical velocity is successfully obtained. The extension from double-round to triple-round strategy also shows great potential to invert all of the three parameters.
Keywords: Solid earth physical anisotropy media Fréchet kernel parameterization joint inversion
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