程玖兵,
同济大学海洋地质国家重点实验室, 上海 200092
基金项目: 国家重点研发计划（2017YFB0202903，2018YFC0310104）和国家自然科学基金（41674117）以及中国科学院战略性先导科技专项（A类）（XDA14010203）资助
详细信息
作者简介: 邹鹏, 男, 1993年生, 同济大学在读博士, 主要从事地震波传播模拟和反演方面研究.E-mail:1533006@tongji.edu.cn
通讯作者: 程玖兵, 教授, 研究方向:地震波传播、成像与反演及其在油气资源勘探和岩石圈成像中的应用.E-mail:cjb1206@tongji.edu.cn
中图分类号: P631收稿日期:2018-09-25
修回日期:2019-03-19
上线日期:2020-01-05
Visco-acoustic wave equation reflection inversion for the Q model
ZOU Peng,CHENG JiuBing,
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
More Information
Corresponding author: CHENG JiuBing,E-mail:cjb1206@tongji.edu.cn
MSC: P631--> Received Date: 25 September 2018
Revised Date: 19 March 2019
Available Online: 05 January 2020
摘要
摘要:地震波在非弹性介质中的衰减效应常用品质因子Q度量.相对准确的Q模型对提高强衰减介质中地震波成像的质量至关重要.本文提出了黏声介质反射波形反演（QRWI）方法来重建地下宏观Q模型.在缺乏大偏移距和低频地震数据时，该方法以黏声波方程为波场传播引擎，利用反射波核函数对模型中深部的敏感性去提取背景Q值.当速度高、低波数成分均已知时，基于波形拟合的QRWI可以获得较高分辨率的反演结果.由于地下介质速度的高波数扰动很难准确估计，本文通过引入峰值频移目标函数，极大地降低了QRWI对速度高波数成分的依赖.理论合成数据实验结果表明，本文方法反演得到的宏观Q模型可以满足衰减补偿逆时偏移成像的要求.
关键词: 衰减介质/
品质因子/
峰值频率/
反射波形反演
Abstract:Seismic wave attenuation in anelastic media is characterized by the quality factor (Q). An appropriate Q model is very important for improving the quality of seismic imaging in strong attenuation setting. In this paper, we develop a visco-acoustic wave equation reflection waveform inversion (QRWI) to update the background Q model. When the low frequencies and long-offset components of seismograms are unavailable, QRWI use the visco-acoustic wave equation as a wave propagator and exploit the reflection kernel to update the deep part of the Q model. If both the low-and high-wavenumber velocity components are known, QRWI can obtain relatively high resolution inverted model by matching the waveform directly. Because of the difficulty to accurately estimate the high-wavenumber velocity perturbations, we further introduce the misfit function of peak frequency shifts to reduce the dependency on the high-wavenumber components of the velocity model. The synthetic example demonstrates that the inverted Q model by QRWI can be confidently used for attenuation compensation in reverse time migration.
Key words:Anelastic media/
Quality factor/
Peak frequency/
Reflection waveform inversion
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http://www.geophy.cn/data/article/export-pdf?id=dqwlxb_15305
