基于射线理论的各向异性煤层地震响应

Seismic Response of Anisotropic Coal Based on Ray Theory

  • 摘要: 以VTI型煤层为研究对象,从介质中的地震波的射线方向、走时计算等多个方面展开讨论,分析VTI型煤层的试射法射线追踪技术,充分利用VC++的面向对象类框架泛型编程的特点和Fortran数值计算方面的优势,通过混合编程实现VTI型煤层中的地震波试射法射线追踪;通过各向同性煤层和VTI型煤层的射线追踪试算对比,论证对VTI型煤层进行各向异性射线追踪的必要性,同时验证本文VTI型煤层射线追踪方法的正确性.最后,通过计算时间成本比较,表明该方法计算速度较快,能满足地震正演模拟的要求.该方法适用于各向异性煤层的多波射线追踪.

     

    Abstract: We illustrate a technique of ray tracing by shooting method and analyze rules of ray in VTI coal. With mixed-language programming of VC ++ and Fortran, ray tracing in VTI coal with a complex velocity model is realized. It demonstrates necessaries of anisotropic ray tracing in VTI coal by comparison of ray tracing in VTI coal and isotropic media. By contrast of calculation time, it indicates that this method is efficient to meet needs of seismic records forward. The technique can be used in multi-wave ray tracing in anisotropic coal as giving responding formulae and parameters.

     

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