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《Progress In Geophysics》 2005-02
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Analysis of P-Wave nonhyperbolic reflection moveout in VTI media

LU Ming-hui , TANG Jian-hou , HU Bin, YANG Hui-zhu (Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China)  
Transverse isotropy (TI) with a vertical symmetry axis (VTI) is the most common model for academic research on anisotropy and prestack imaging of multi-wave and multi-component reflection seismic data. The traveltime-distance curve of reflected P-wave in VTI media is not hyperbolic anymore. Based on different P-wave phase velocity approximations, different traveltime-distance formulae can be deduced. In this paper, we compare several traveltime approximations with exact traveltime obtained by using ray trace method on different anisotropic degree. The results show that Muir's and Stovas's traveltime approximations have large error owing to their overestimation the influence of SV-wave vertical velocity; moreover, that Tsvankin's weak anisotropic traveltime approximation has a little large error when ε-δ0; furthermore, that Alkhalifah's traveltime approximation has enough accuracy for strong anisotropy and large offset, which is suitable for seismic data processing.
【Fund】: 国家自然科学基金(10272064);; 清华大学基础研究基金(JC2002038)联合资助.
【CateGory Index】: P631.4
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