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Compensation for absorption and dispersion in prestack migration; an effective Q approach

Zhang Jianfeng, Wu Jizhong and Li Xueying
Compensation for absorption and dispersion in prestack migration; an effective Q approach
Geophysics (February 2013) 78 (1): S1-S14

Abstract

We have developed a migration scheme that can compensate absorption and dispersion caused by intrinsic attenuation in subsurface media. The scheme was developed by adapting prestack time migration (PSTM) in the frequency domain. Instead of applying a commonly used Q factor, we devised an effective Q parameter to compensate absorption and dispersion. The effective Q determines the frequency-dependent traveltime and amplitude at one imaging location by only one value. As a result, the effective Q can be estimated by scanning technology. We designed an index that can remove the effects of interferences of the reflections resulting from stacked thin layers in extracting the effective Q parameter from scanning results. The proposed scheme can thus determine an effective Q model using surface seismic data during migration. Stabilization is achieved by introducing a smooth, maximum-limited gain function that matches the exact amplitude compensation factor when it is less than the user-specified gain limit. The proposed scheme can be incorporated into conventional PSTM workflow. Synthetic and field data sets were used to test the proposed deabsorption PSTM. Higher-resolution imaging results are obtained.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 78
Serial Issue: 1
Title: Compensation for absorption and dispersion in prestack migration; an effective Q approach
Affiliation: Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing, China
Pages: S1-S14
Published: 201302
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 29
Accession Number: 2013-030480
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201319
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