Time-domain wavefield reconstruction inversion  

时间域波场重构反演（英文）

作　　者：Li Zhen-Chun Lin Yu-Zhao Zhang Kai Li Yuan-Yuan Yu Zhen-Nan 李振春;蔺玉曌;张凯;李媛媛;于振南(中国石油大学(华东)地球科学与技术学院,青岛266580;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,青岛266071)

机构地区：[1]School of Geosciences, China University of Petroleum, Qingdao 266580, China [2]Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China.

出　　处：《Applied Geophysics》2017年第4期523-528,621,共7页应用地球物理（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41374122 and 41504100)

摘　　要：Wave field reconstruction inversion （WRI） is an improved full waveform inversion theory that has been proposed in recent years. WRI method expands the searching space by introducing the wave equation into the objective function and reconstructing the wavefield to update model parameters, thereby improving the computing efficiency and mitigating the influence of the local minimum. However, frequency-domain WRI is difficult to apply to real seismic data because of the high computational memory demand and requirement of time-frequency transformation with additional computational costs. In this paper, wavefield reconstruction inversion theory is extended into the time domain, the augmented wave equation of WRI is derived in the time domain, and the model gradient is modified according to the numerical test with anomalies. The examples of synthetic data illustrate the accuracy of time-domain WRI and the low dependency of WRI on low-frequency information.波场重构反演是一种改进的全波形反演理论。该反演方法通过将波动方程引入目标函数中拓宽了解的寻找空间,通过重构真实波场来计算模型梯度,大大提高了计算效率的同时还减弱了局部极小值的影响。但目前该理论基本在频率域进行,而频率域反演对计算内存的需求太高,并且很难应用到实际生产中。因此,本文将波场重构反演拓展到时间域,推导了时间域波场重构的增广方程,结合模型试算结果对波场重构的模型梯度进行了修改。数值实验表明,时间域波场重构反演准确性较高并且对低频信息具有良好的重建能力。

关 键 词：Wavefield reconstruction waveform inversion augmented wave equation time- domain inversion 

分 类 号：P631.4[天文地球—地质矿产勘探]