Parametric inversion of viscoelastic media from VSP data using a genetic algorithm

Parametric inversion of viscoelastic media from VSP data using a genetic algorithm
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使用遗传算法根据 VSP 数据对粘弹性介质进行参数反演

DOI:
10.1007/s11770-007-0025-8
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发表时间:
2007-08
期刊:
影响因子:
0.7
通讯作者:
--
中科院分区:
地球科学4区
文献类型:
--
作者:

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粘弹性参数的反演算法越来越受到研究者的重视。遗传算法具有随机、自适应、鲁棒性和启发式的特点,具有全局搜索和收敛能力。在直接VSP波动方程的基础上,引入遗传算法确定粘弹性参数。首先将频率上的直波方程表示为复速度的函数,然后利用遗传算法反演得到复速度。由于相速度和q因子都是复速度的函数,所以它们的值可以很容易地计算出来。然而,有太多的复速度,很难直接反演它们。它们可以重写为c∞和c∞的函数,以减少反演过程中参数的数量。最后,通过理论模型实验证明了算法的准确性和有效性。
Viscoelastic parameters are becoming more important and their inversion algorithms are studied by many researchers. Genetic algorithms are random, self-adaptive, robust, and heuristic with global search and convergence abilities. Based on the direct VSP wave equation, a genetic algorithm (GA) is introduced to determine the viscoelastic parameters. First, the direct wave equation in frequency is expressed as a function of complex velocity and then the complex velocities estimated by GA inversion. Since the phase velocity and Q-factor both are functions of complex velocity, their values can be computed easily. However, there are so many complex velocities that it is difficult to invert them directly. They can be rewritten as a function ofc0andc∞to reduce the number of parameters during the inversion process. Finally, a theoretical model experiment proves that our algorithm is exact and effective.
DOI: --
发表时间: 2006
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影响因子: --
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