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Application of the equivalent offset migration method in acoustic log reflection imaging

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  • Borehole Geophysics
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Abstract

Borehole acoustic reflection logging can provide high resolution images of near-borehole geological structure. However, the conventional seismic migration and imaging methods are not effective because the reflected waves are interfered with the dominant borehole-guided modes and there are only eight receiving channels per shot available for stacking. In this paper, we apply an equivalent offset migration method based on wave scattering theory to process the acoustic reflection imaging log data from both numerical modeling and recorded field data. The result shows that, compared with the routine post-stack depth migration method, the equivalent offset migration method results in higher stack fold and is more effective for near-borehole structural imaging with low SNR acoustic reflection log data.

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Correspondence to Guo Tao.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 50674098), the 863 Program (Grant No. 2006AA06Z207 & 2006AA06Z213), and the 973 Program (Grant No. 2007CB209601).

Zhang Tiexuan holds a B.S. degree in Well Logging from China University of Petroleum-East China and a Masters degree in Geological Engineering from China University of Petroleum-Beijing. Now she is studying for her PhD degree in geological resources and geological engineering at the University of Petroleum-Beijing. She is currently concentrating on acoustic logging and wireline formation testing and, at the same time, undertaking well logging method research for heavy oil reservoirs.

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Zhang, T., Tao, G., Li, J. et al. Application of the equivalent offset migration method in acoustic log reflection imaging. Appl. Geophys. 6, 303–310 (2009). https://doi.org/10.1007/s11770-009-0041-y

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  • DOI: https://doi.org/10.1007/s11770-009-0041-y

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