ISSN 1009-6248CN 61-1149/P 双月刊

主管单位:中国地质调查局

主办单位:中国地质调查局西安地质调查中心
中国地质学会

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    基于Kuhn-Munkres模式搜索算法的地震面波反演研究

    Research on Oil Seismic Surface Wave Inversion based on Pattern Search with Embedded Kuhn-Munkres Algorithm

    • 摘要: 地震勘探资料中的面波信息能够反演近地表覆盖层结构,然而面波能量分布在各阶模式中,以能量高低为标准判别的面波模式并不准确,因此常规的多模式面波反演存在模式误判的问题,从而影响近地表结构反演的准确性。笔者基于Kuhn-Munkres模式搜索算法对参与反演的面波频散曲线模式进行判定,并将其应用于实际地震面波资料的处理和反演中,在准确判定高阶模式频散曲线阶数的基础上反演建立地下速度结构。利用传统算法对基阶模式面波频散曲线进行单独反演获得初步模型,建立初步模型和各频率无明确模式阶数相速度的加权二部图,通过Kuhn-Munkres算法对不同模式的相速度进行最优匹配,实现高阶面波频散曲线的模式判别和联合反演。通过3个典型理论地层模型算例验证了方法的有效性,对两组实际资料进行处理得到相关研究区的近地表一维横波速度结构及二维剖面,研究结果表明该算法能够有效解决面波多模式频散曲线反演中的模式误判问题。

       

      Abstract: Surface waves in seismic exploration data provide crucial information about the near surface overburden structure. However, the surface wave energy is distributed in each mode, it is not accurate to discriminate the surface wave mode based on dispersive energy, so the conventional multi-mode surface wave inversion has the problem of mode misidentification, which affects the accuracy of near-surface structure inversion. In this paper, the modes of dispersion curves involved in inversion are determined on the based Kuhn-Munkres pattern searches algorithm, the algorithm is also applied to process and inverse actual seismic surface waves, and the underground velocity structure is established by the inversion based on accurately determining the order of higher-mode dispersion curves. Firstly, the traditional algorithm is utilized to invert the single fundamental mode dispersion curve to obtain a preliminary model. Then, the preliminary model and a weighted bipartite graph of phase velocities with no-explicitly-specified-mode at each frequency is established. The phase velocities of different modes are optimally matched by the Kuhn-Munkres algorithm, and then the mode discrimination and joint inversion with higher-order surface wave dispersion curves are implemented. The effectiveness of this algorithm is verified by three typical theoretical stratigraphic model examples, finally, two sets of actual data are processed to obtain the near-surface one-dimensional shear-wave velocity structure and two-dimensional profile of the relevant study area. The results demonstrate that the algorithm effectively solves the problem of mode misidentification in surface wave multi-mode dispersion curve inversion.

       

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