基于模型参数化的地震波走时与射线路径计算  

Computation of Seismic Traveltimes and Raypath Based on Model Parameterization

作　　者：孙建国[1] 李懿龙 孙章庆[1] 苗贺 Sun Jianguo;Li Yilong;Sun Zhangqing;Miao He(College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China)

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《吉林大学学报（地球科学版）》2018年第2期343-349,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41274120;41404085);吉林大学优秀青年教师培养计划(419080500337)~~

摘　　要：模型的建立与描述是地震资料分析与处理的基础,合理的模型参数化方式对于地震正反演的各个方面都有很好的效果,其中射线追踪在正演模拟、层析成像及偏移等研究领域中都占有很重要的地位。本文针对地震波走时与射线路径计算,设计了一种将离散模型连续化的最小二乘模型参数化方法,分别对速度模型和走时模型进行模型参数化,然后进行梯度速度模型验算及误差分析。计算结果表明,该模型参数化方法使走时计算精度从10-2提高到10-3,使射线路径的计算精度提高了14.33%。最后通过经典Marmousi模型和Sigsbee 2A模型实例验证,充分证明了该模型参数化方法的有效性及普遍适用性。The establishment and description of the model is the basis of seismic data analysis and processing,and the reasonable model parameterization method has achieved good results for all aspects of seismic forward and inversion.Ray tracing plays an important role in the fields of forward modeling,tomography,and migration.The authors studied the ray tracing method,designed a model of least squares parametric method,parameterized the model of velocity and travel time respectively,and then tested it by using the velocity gradient model and error analysis.The results show that the model parameterization improves the precision of travel time calculation and the tracking ray path.The validity and applicability of the model parameterization method are proved by the example of the classical Marmousi model and the Sigsbee2A model.

关 键 词：模型参数化 走时计算 路径追踪 最小二乘 

分 类 号：P631.4[天文地球—地质矿产勘探]