基于双差的波动方程反射波旅行时反演方法  

Double difference wave-equation reflection traveltime inversion

作　　者：崔超 黄建平[1,2] 王自颖 国运东 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071

出　　处：《石油地球物理勘探》2017年第4期734-742,共9页Oil Geophysical Prospecting

基　　金：国家"973"课题(2014CB239006);国家自然科学基金(41274124);国家油气重大专项课题(2016ZX05014001;2016ZX05002)联合资助

摘　　要：当模拟数据与观测数据振幅、波形相差较大时,动态时差矫正(Dynamic Image Warping,DIW)方法拾取的旅行时时差精度较低,易导致目标泛函收敛失败。为此,本文通过修改目标泛函,提出了一种基于双差的波动方程反射波旅行时反演(Double difference Wave Equation Reflection Traveltime Inversion,DWERTI)方法,并对传统的DIW方法进行正则化约束以提高时差估计的稳定性。在编程实现算法的基础上对Sigsbee 2A模型进行反演测试。计算结果表明:基于双差的波动方程反射波旅行时反演方法能够有效提高旅行时信息反演的稳定性,为后续常规全波形反演提供更为可靠的初始速度场。When the modeled data and the observed data are significantly different in terms of the amplitude and waveform,the traveltime picked by Dynamic Image Warping(DIW)is not accurate enough,which may lead to the failure of the convergence of the misfit function.In this paper,we introduce a Double difference Wave Equation Reflection Traveltime Inversion(DWERTI)method by proposing a new misfit function.Besides,we modify the conventional DIW method with a regularization term to improve its performance.We apply the proposed inversion strategy on a portion of Sigsbee 2A model to test its feasibility based on programming.From the numerical test,we can draw the conclusion that double difference wave equation reflection traveltime inversion method proposed in this paper can greatly improve the stability of traveltime inversion and provide a more reliable initial model for the following conventional full waveform inversion.

关 键 词：反射波旅行时反演 动态时差校正 旅行时双差 正则化项 

分 类 号：P631[天文地球—地质矿产勘探]