基于卷积完全匹配层的旋转交错网格高阶差分法模拟弹性波传播
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Release time:2020-08-07 DOI number:10.11720/wtyht.2018.1320 Affiliation of Author(s):中南大学地球科学与信息物理学院 Teaching and Research Group:中南大学应用地球物理系 Journal:物探与化探 Place of Publication:中国 Key Words:旋转交错网格；高阶差分法；卷积完全匹配层；各向异性介质；随机介质；正演 Abstract:从一阶速度—应力弹性波方程出发,基于旋转交错网格,推导了时间二阶精度空间2M阶精度的有限差分离散格式。阐述了递归卷积复频移完全匹配层(CPML)边界条件的原理,建立了一阶速度—应力弹性波高阶差分CPML边界条件的递推公式。开展了CPML边界中关键参数m、κ和α的选取实验,通过分析反射误差分布图,选取了CPML边界条件中最优参数。全局反射误差与波场快照都说明,CPML较PML对隐失波具有更优的吸收性能。基于Matlab平台,编写了基于CPML边界的旋转交错网格弹性波正演模拟程序,应用该程序对各向异性介质及随机介质进行了模拟,得到了弹性波正演剖面记录及波场快照,通过对正演剖面记录及波场快照的分析,可以更清楚地了解弹性波在各向异性介质及随机介质的传播特性,指导非均匀介质中地震勘探资料解释。 Co-author:王向宇 First Author:冯德山 Indexed by:Applied Research Document Code:DOI：10.11720/wtyht.2018.1320 Volume:42 Issue:4 Page Number:766-776 Translation or Not:no Date of Publication:2018-11-29 -
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