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《应用地球物理(英文版)》 2006-02
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AVO inversion based on common shot migration

Shou Hao1 , Liu Hong1, and Gao Jianhu121. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.. 2. Northwest Institute, Research Institute of petroleum Exploration and Development, PetroChina, Lanzhou 730000, China.  
Conventional AVO inversion utilizes the trace amplitudes of CMP gathers. There are three main factors affecting the accuracy of the inversion. First, CMP gathers are based on the hypothesis of horizontal layers but most real layers are not horizontal. Greater layer dip results in a greater difference between the observed CMP gathers and their real location. Second, conventional processing flows such as NMO, DMO, and deconvolution will distort amplitudes. Third, the formulation of reflection coefficient is related to incidence angles and it is difficult to get the relationship between amplitude and incidence angle. Wave equation prestack depth migration has the ability of imaging complex media and steeply dipping layers. It can reduce the errors of conventional processing and move amplitudes back to their real location. With true amplitude migration, common angle gathers abstraction, and AVO inversion, we suggest a method of AVO inversion from common shot gathers in order to reduce the effect of the above factors and improve the accuracy of AVO inversion.
【Fund】: This project is sponsored by the “Pre-Cenozoic Marine Oil and Gas Resource Research around the Bohai Area” of the Knowledge Innovation Project of The Chinese Academy of Sciences (No. KZCX1-SW-18)
【CateGory Index】: P631.4
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