孙昌潇^1,2,,
毛伟建^1,,,
张庆臣¹,
石星辰¹
1. 中国科学院精密测量科学与技术创新研究院计算与勘探地球物理研究中心; 大地测量与地球动力学国家重点实验室, 武汉 430077
2. 中国科学院大学, 北京 100049

基金项目: 国家自然科学基金（41974163，42130808）和中国石油天然气集团公司项目《深层与非常规物探新方法新技术》（2019A-33）联合资助


详细信息

作者简介: 孙昌潇, 女, 1993年生, 在读博士, 主要从事成像和反演研究.E-mail: sunchangxiao@apm.ac.cn

通讯作者: 毛伟建, 男, 研究员, 博士生导师, 主要从事地震数据处理、成像和反演研究.E-mail: wjmao@whigg.ac.cn

中图分类号: P631

收稿日期:2020-12-26
修回日期:2021-07-11
上线日期:2021-11-10

3D least-squares elastic Gaussian beam prestack depth migration

SUN ChangXiao^1,2,,
MAO WeiJian^1,,,
ZHANG QingChen¹,
SHI XingChen¹
1. Center for Computational and Exploration Geophysics, Innovation Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences; and State Key Laboratory of Geodesy and Earth's Dynamics, Wuhan 430077, China
2. University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: MAO WeiJian,E-mail:wjmao@whigg.ac.cn

MSC: P631

--> Received Date: 26 December 2020
Revised Date: 11 July 2021
Available Online: 10 November 2021


摘要
摘要:与声波高斯束成像相比，弹性波高斯束偏移更适用于复杂油气藏多波多分量地震勘探.但是由于观测系统的局限性和深部构造的复杂性，该方法同样存在成像分辨率低、照明不均衡等问题.本文结合最小二乘偏移和弹性高斯束偏移的优势，提出了一种通过弹性高斯束叠加构建Born正演（反偏移）算子和偏移算子的三维最小二乘叠前深度偏移方法.依据最小二乘反演理论，建立基于反偏移数据与实际观测数据残差的目标函数，采用共轭梯度算法迭代更新来建立地下真实的反射率.与传统弹性高斯束偏移方法相比，该方法不仅提高了成像分辨率，而且使复杂构造特别是陡倾角地层的成像照明也得到了补偿.理论模型测试结果证明了本文方法的可行性和有效性.
关键词: 弹性高斯束/
最小二乘偏移/
Born正演/
共轭梯度法

Abstract:Compared with acoustic Gaussian beam images, elastic Gaussian beam migration is more suited to multi-wave and multi-component seismic exploration of complex oil and gas reservoirs.However, due to the limitation of seismic observational system and complexity of the deep structure, it also has the problems of poor resolution and illumination in elastic wave imaging.Therefore, combining the advantages of least-squares migration(LSM)and elastic Gaussian beam migration method, this paper proposes an algorithm of least-squares elastic Gaussian beam migration(LSEGBM)in three dimentional medium by using the Born modeling(demigration)and adjoint migration operators represented by summing the elastic Gaussian beams.With the linearized inversion idea, the misfit function is built based on the residual between demigrated data and observed data.Then the true reflectivity of underground medium can be recovered by iterations with a conjugate gradient method.Compared with the conventional elastic Gasussian beam migration, the proposed algorithm can improve not only the imaging resolution, but also the illumination of complexed structure, especially for the steep-dip stratum.Numerical tests, including a 2D sunken model, Marmousi2 model and 3D truncated SEG/EAGE Salt model, prove the feasibility and effectiveness of our algorithm.
Key words:Elastic Gaussian beam/
Least-squares migration/
Born modeling/
Conjugate gradient method



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