近似解析离散化方法的粘弹声波方程数值模拟及波场特征分析

发布时间：2018-07-03 08:35

  本文选题：粘弹介质 + 近似解析离散方法　； 参考：《石油物探》2017年03期

【摘要】：地层的粘弹性对地震波产生的吸收和衰减规律非常复杂,所以研究地震波在粘弹性介质中的传播规律对地震勘探有着重要的意义。近似解析离散化方法是近年来出现的一种有限差分数值模拟方法,籍此探讨了几种近似解析离散化方法的原理和过程。通过与一维粘弹声波方程解析解的对比,认为改进的近似解析离散化方法(INAD)的精度、稳定性和计算效率更具优势,并将其首次应用于二维粘弹声波方程数值模拟。通过数值模拟,重点分析了声波振幅、频率、频带宽度随品质因子及传播距离的衰减规律,粘弹介质中的地震波不仅因波前扩散导致振幅衰减,还因吸收作用导致振幅和频率同时衰减,利用其衰减特征可以指导含油气储层的预测。
[Abstract]:The absorption and attenuation of seismic waves by viscoelastic strata are very complicated, so it is of great significance to study the propagation of seismic waves in viscoelastic media. The approximate analytic discretization method is a finite difference numerical simulation method which has appeared in recent years. The principle and process of several approximate analytic discretization methods are discussed in this paper. Compared with the analytical solution of one-dimensional viscoelastic acoustic equation, the improved approximate analytical discretization method (Inad) is considered to have more advantages in accuracy, stability and computational efficiency, and it is applied to the numerical simulation of two-dimensional viscoelastic acoustic equation for the first time. Through numerical simulation, the attenuation law of acoustic wave amplitude, frequency and band width with quality factor and propagation distance is analyzed. Seismic wave in viscoelastic medium not only attenuates amplitude due to wave front diffusion. The amplitude and frequency attenuate at the same time because of absorption, which can be used to predict the oil and gas reservoir.
【作者单位】： 油气资源与勘探技术教育部重点实验室(长江大学);
【基金】：国家重点基础研究发展计划(973计划)(2013CB228605)和中国石油科技创新基金项目(2015D-5006-0301)联合资助~~
【分类号】：P631.4
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本文编号：2093044