Joint interferometric imaging of walkaway VSP data |
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| Authors: | Bao-Li Wang Guang-Ming Zhu Jing-Huai Gao |
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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;2.College of Geology Engineering and Geomatics,Chang’an University,Xi’an,China |
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| Abstract: | In this paper, we image the subsurface reflectors by interferometric imaging using primary and downgoing first-order free-surface
related multiple reflections in walkaway VSP data. By analyzing the stack fold distribution, we find that primary-direct interferometric
imaging has a smaller image range, but its stack fold is higher near the well while ghost-direct interferometric imaging is
the opposite. We try to solve this problem by the joint interferometric imaging of walkaway VSP data, combining primary-direct
interferometric imaging with ghost-direct interferometric imaging. In this way, we can effectively widen the imaging range,
simultaneously increase the fold (especially near the well), suppress spurious interference, and improve the image SNR, so
that we can get a more credible image. Test results on synthetic walkaway VSP data and field data show that joint interferometric
imaging is very effective. |
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| Keywords: | interferometry imaging multiple wave walkaway VSP |
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