Viscoacoustic generalized screen propagator in constant-Q model  

作　　者：Zhong-Kui Dai Jia-Chun You Xing-Guo Huang Wei Liu 

机构地区：[1]College of Geophysics,Chengdu University of Technology,Chengdu,610059,Sichuan,China [2]College of Instrumentation and Electrical Engineering,Jilin University,Changchun,130021,Jilin,China

出　　处：《Petroleum Science》2024年第4期2356-2369,共14页石油科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (grant Nos.42004103,42374149);Sichuan Science and Technology Program (grant No.2023NSFSC0257);CNPC Innovation Found (2022DQ02-0306)。

摘　　要：When seismic waves propagate through the geological formation,there is a significant loss of energy and a decrease in imaging resolution,because of the viscoacoustic properties of subsurface medium.This profoundly impacts seismic wavefield propagation,imaging and interpretation.To accurately image the true structure of subsurface medium,the consensus among geophysicists is to no longer treat subsurface medium as ideal homogeneous medium,but rather to incorporate the viscoacoustic properties of subsurface medium.Based on the generalized screen propagator using conventional acoustic wave equation(acoustic GSP),our developed method introduces viscoacoustic compensation strategy,and derives a one-way wave generalized screen propagator based on time-fractional viscoacoustic wave equation(viscoacoustic GSP).In numerical experiments,we conducted tests on two-dimensional multi-layer model and the Marmousi model.When comparing with the acoustic GSP using the acoustic data,we found that the imaging results of the viscoacoustic GSP using the viscoacoustic data showed a significant attenuation compensation effect,and achieved imaging results for both algorithms were essentially consistent.However,the imaging results of acoustic GSP using viscoacoustic data showed significant attenuation effects,especially for deep subsurface imaging.This indicates that we have proposed an effective method to compensate the attenuated seismic wavefield.Our application on a set of real seismic data demonstrated that the imaging performance of our proposed method in local areas surpassed that of the conventional acoustic GSP.This suggests that our proposed method holds practical value and can more accurately image real subsurface structures while enhancing imaging resolution compared with the conventional acoustic GSP.Finally,with respect to computational efficiency,we gathered statistics on running time to compare our proposed method with conventional Q-RTM,and it is evident that our method exhibits higher computational efficiency.In summary,o

关 键 词：One-way wave equation Viscoacoustic wave equation Generalized screen propagator Attenuation and dispersion effects 

分 类 号：P631.4[天文地球—地质矿产勘探]