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High-resolution imaging: a wavelet stretch correction in de-absorption prestack time migration approach
Wang, Jin1,2; Xu, Jincheng1,3; Zhang, Jiangfeng1,3; Liu, Qiancheng4,5; Liu, Linong1
2020-07-03
Source PublicationEXPLORATION GEOPHYSICS
ISSN0812-3985
Volume51Issue:4Pages:446-455
AbstractThe wavelet stretch effects in pre-stack migration, which is similar to that of NMO stretch, distort the frequency spectrums and taper the high-frequency components at far offsets. The long-offset migrated results in conventional migration methods are muted, resulting in a loss of effective information about the subsurface investigation. Only short-offset data are used to obtain a high-resolution stacked image. However, long-offsets that correspond to high-incident-angle data are critical to velocity inversion and amplitude versus offset (AVO) analysis when estimating lithology and fluid product. Furthermore, attenuation of seismic waves due to the anelasticity of the subsurface medium will cause dissipation of seismic energy and loss of high frequencies, thus broadening the propagating wavelet and degrading the resolution of imaging. Both the wavelet stretch and the absorption will taper the high-frequency components. We developed a wavelet stretch correction and absorption compensation scheme during the migration process by shrinking the wavelet when applying the imaging condition, which matches the stretch effect caused by migration. The correction factor is derived based on the incidence angle associated with many factors. Moreover, the de-absorption pre-stack time migration (QPSTM) is implemented on the effectiveQmodel that makes theQmodelling become easier. Both the application of synthetic and real data examples demonstrate that the proposed anti-stretch QPSTM can be particularly useful recovering the high-frequency components caused by anelasticity and wavelet stretch, and obtain higher-resolution images.
KeywordViscoelasticity stretch correction prestack migration far offset
DOI10.1080/08123985.2019.1706219
WOS KeywordNORMAL-MOVEOUT ; DEPTH MIGRATION
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000562754600004
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/97676
Collection油气资源研究院重点实验室
Corresponding AuthorWang, Jin; Xu, Jincheng
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.Southern Univ Sci & Technol, Dept Earth & SpaceSci, Shenzhen 518055, Peoples R China
4.King Abdullah Univ Sci & Technol, Thuwal, Saudi Arabia
5.UCL, London, England
First Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Petroleum Resource Research, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang, Jin,Xu, Jincheng,Zhang, Jiangfeng,et al. High-resolution imaging: a wavelet stretch correction in de-absorption prestack time migration approach[J]. EXPLORATION GEOPHYSICS,2020,51(4):446-455.
APA Wang, Jin,Xu, Jincheng,Zhang, Jiangfeng,Liu, Qiancheng,&Liu, Linong.(2020).High-resolution imaging: a wavelet stretch correction in de-absorption prestack time migration approach.EXPLORATION GEOPHYSICS,51(4),446-455.
MLA Wang, Jin,et al."High-resolution imaging: a wavelet stretch correction in de-absorption prestack time migration approach".EXPLORATION GEOPHYSICS 51.4(2020):446-455.
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