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| Seismogram synthesis method based on spherical wave and A VO analysis |
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HUANG Rao1,CHEN Xiao-hong1,3,LI Jing-ye2,3
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(1. Key Laboratory of Geophysical Exploration of CNPC，China University of Petroleum, Beijing 102249，China;2. Key Laboratory for Hydrocarbon Accumulation Mechanism, Ministry of Education，China University of Petroleum,Beijing 102249, China;3. State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum，Beijing 102249, China)
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| Abstract: |
| The amplitude versus offset AVO seismic equation based on spherical wave theory was transformed via Laplace transform by assuming a wavelet to be of Rayleigh form. In this process，the computaion of spherical wave reflection coefficients was simplified by the semi-analytical method. The spherical divergence and near-field effects were corrected, and the weighting function was analyzed At last, the theoretical model was calculated and analyzed. TTie results show that spherical wave reflection coefficients not only have relation with incidence angle，but also are influenced by seismic frequency and reservoir depth. Tlie computation of reflection coefficients based on spherical wave is more reasonable than that based on plane wave near the critical angle. |
| Key words: AVO amplitude versus offset spherical wave Rayleigh wavelet weighting function Zoeppritz |
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