3D elastic wave equation forward modeling based on the precise integration method

3D elastic wave equation forward modeling based on the precise integration method
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基于精密积分法的3D弹性波方程正演建模

DOI:
10.1007/s11770-013-0370-8
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发表时间:
2013-03
期刊:
应用地球物理(英文版)
影响因子:
--
通讯作者:
胡天跃
胡天跃
中科院分区:
其他
文献类型:
--
作者:
段玉婷;胡天跃

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有限差分法是地震数值模拟的一种重要方法。它有助于我们了解地震波传播的规律,分析地震属性,解释地震资料。然而,由于其离散化,FD方法仅在某些条件下是稳定的。任意差分精细积分(ADPI)方法是在有限差分法的基础上,采用时域积分和空域任意差分的方法。因此,ADPI方法是一种半解析方法。本文从三维弹性力学方程出发,推导了ADPI法的计算公式,并改进了其稳定性。在正演模拟中,将ADPI方法应用于二维和三维弹性波方程正演模拟。结果表明,反射地震波的走时是准确的。与声波场相比,弹性波场包含更多的波型,包括PS波和PP波反射波、透射波和绕射波,这对地震资料的解释具有重要意义。该方法可方便地应用于地质模型的弹性波动方程数值模拟。
The Finite Difference (FD) method is an important method for seismic numerical simulations. It helps us understand regular patterns in seismic wave propagation, analyze seismic attributes, and interpret seismic data. However, because of its discretization, the FD method is only stable under certain conditions. The Arbitrary Difference Precise Integration (ADPI) method is based on the FD method and adopts an integration scheme in the time domain and an arbitrary difference scheme in the space domain. Therefore, the ADPI method is a semi-analytical method. In this paper, we deduce the formula for the ADPI method based on the 3D elastic equation and improve its stability. In forward modeling cases, the ADPI method was implemented in 2D and 3D elastic wave equation forward modeling. Results show that the travel time of the reflected seismic wave is accurate. Compared with the acoustic wave field, the elastic wave field contains more wave types, including PS- and PP- reflected waves, transmitted waves, and diffracted waves, which is important to interpretation of seismic data. The method can be easily applied to elastic wave equation numerical simulations for geological models.
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