Migration scheme for imaging offset VSP data within local phase space |
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Authors: | Yan-Hui Zhou Jing-Huai Gao Bao-Li Wang Yang-Yang He |
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Institution: | 1.Wave and Information Institute of the School of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an,China |
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Abstract: | The imaging of offset VSP data in local phase space can improve the image of the subsurface structure near the well. In this
paper, we present a migration scheme for imaging VSP data in a local phase space, which uses the Gabor-Daubechies tight framebased
extrapolator (G-D extrapolator) and its high-frequency asymptotic expansion to extrapolate wavefields and also delineates
an improved correlation imaging condition in the local angle domain. The results for migrating synthetic and real VSP data
demonstrate that the application of the high-frequency G-D extrapolator asymptotic expansion can effectively decrease computational
complexity. The local angle domain correlation imaging condition can be used to weaken migration artifacts without increasing
computation. |
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Keywords: | VSP data Gabor-Daubechies tight frame high-frequency asymptotic expansion imaging condition migration artifact |
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