Application of the equivalent offset migration method in acoustic log reflection imaging
Zhang Tiexuan1,2, Tao Guo1,2, Li Junjun1,2, Wang Bing1,2, and Wang Hua1,2
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249, China.
2. Beijing Key Laboratory of Geodetection and Information Technology, China University of Petroleum, Beijing, 102249, China.
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.
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).
Cite this article:
ZHANG Tie-Xuan,TAO Guo,LI Jun-Jun et al. Application of the equivalent offset migration method in acoustic log reflection imaging[J]. APPLIED GEOPHYSICS, 2009, 6(4): 303-310.
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