首页|TTI介质中的纯qP波衰减补偿最小二乘逆时偏移成像方法

TTI介质中的纯qP波衰减补偿最小二乘逆时偏移成像方法

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为有效提高衰减各向异性介质中地震波成像剖面的质量,实现稳定的TTI介质中的衰减补偿成像,提出一种基于黏声TTI纯qP波方程的最小二乘逆时偏移方法.在最小二乘偏移框架的基础上,推导相应的Born正演方程、伴随算子和梯度敏感核.由于伴随算子是衰减的,可以避免衰减补偿引起的数值不稳定性.通过同时考虑各向异性和吸收衰减的影响,衰减补偿最小二乘逆时偏移可以提供高分辨率、更少假象和振幅均衡的偏移结果.最后,通过模型试验和实际数据的测试及分析,验证了新方法的可行性和适用性.结果表明,黏声TTI最小二乘逆时偏移成像在衰减区域可进行高质量成像,丰富成像剖面中的波数成分,拓宽成像剖面中的频带宽度,提高地下介质成像剖面的分辨率及成像精度.
Pure qP-wave attenuation-compensated LSRTM in TTI media
To improve the quality of seismic wave imaging in attenuated anisotropic media and achieve stable attenuation-com-pensated imaging in TTI media,we propose a least-squares reverse time migration method(Q-TTI-LSRTM)based on a vis-coacoustic TTI pure qP-wave equation.Within the least-squares migration framework,the corresponding Born modeling equa-tion,the adjoint equation,and the gradient sensitivity-kernel for the Q-TTI-LSRTM are derived.The Q-TTI-LSRTM method naturally eliminates the numerical instability caused by attenuation compensation,as the amplitude attenuation is incorporated into the adjoint equation.Additionally,the method avoids qSV-wave inferference due to the use of the viscoacoustic TTI pure qP-wave equation.It produces migration images with high resolution,fewer artifacts,and balanced amplitude by accounting for anisotropy and absorption attenuation.Finally,model tests and field data analysis confirm the feasibility and applicability of the method.The imaging results demonstrate that the Q-TTI-LSRTM can privide high-quality imaging in attenuated regions,en-hance wavenumber components,broaden frequency bandwidth,and improve the resolution and accuracy of subsurface media imaging.

attenuation and compensationleast-squares reverse time migration(LSRTM)TTI mediapure qP-wavenear-ly constant Q model

李振春、张闪闪、秦宁、谷丙洛、丁奕文

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中国石油大学(华东)地球科学与技术学院,山东 青岛 266580

深层油气全国重点实验室(中国石油大学(华东)),山东 青岛 266580

中国石化胜利油田分公司物探研究院,山东 东营 257100

衰减补偿 最小二乘逆时偏移 TTI介质 纯qP波 近似常Q模型

国家自然科学基金项目中石油重大科技合作项目山东省自然科学基金项目胜利油田博士后课题泰山产业领军人才工程项目

42004093ZD2019-183-003ZR2020QD050YKB2420

2024

中国石油大学学报(自然科学版)
中国石油大学

中国石油大学学报(自然科学版)

CSTPCD北大核心
影响因子:1.169
ISSN:1673-5005
年,卷(期):2024.48(5)