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本文研究了如何在薄层地质构造中可靠地分析散射引起的随频率变化的Q值,并指出了该研究对数据的要求。应用随机模型完成了数值波传播试验。建立了反射系数的自回归移动平均模型及高斯分布函数。用现有的参数集估计由实际测井资料确定的沉积层序。采用ARMA模型后,散射衰减α及品质因子Q的解析表达式可由O′Doberty—Anstcy公式导出。
In this paper, we study how to reliably analyze scattering-induced Q values with frequency variation in thin-layer geological structures and point out the data requirements of the study. The numerical wave propagation experiment is completed by using stochastic model. The autoregressive moving average model and Gaussian distribution function of reflection coefficient are established. The existing parameter set is used to estimate the sedimentary sequence determined by the actual log data. After using the ARMA model, the analytical expressions for the scattering attenuation α and the quality factor Q can be derived from the O’Doberty-Anstcy formula.