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《Progress in Geophysics》 2008-01
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Elastic impedance equation based on Fatti approximation and inversion

WANG Bao-li1,YIN Xing-yao1,ZHANG Fan-chang1,Li Ai-shan2(1.Department of Geo-resources and Information,China University of Petroleum(East China),DongYing 257061,China; 2.International Research Dept.CNOOC Research Center,Beijing 100027,China)  
Using Connolly's Elastic Impedance equation for inversion,only P-wave velocity,S-wave velocity and Density information can be obtained directly,then other parameters data such as P-Impedance and S-Impedance can be calculated indirectly, so this conventional inversion method increases one step error which reduces accuracy of the data.We propose a new elastic impedance equation based on the Fatti Zoeppritz approximation to address the conventional inversion method's deficiencies,using this new equation can obtain more accurate reflectivity than Fatti approximation.This equation has been normalized to unify the elastic impedance dimensions at different angles and used for inversion.P-and S-Impedance can be extracted directly from the elastic impedance data of different angles obtained from inversion using the linear relation between P-and S-Impedance and elastic impedance.The application example shows that the P-and S-Impedance extracted using this new method are more stable and correct and can recover the reservoir information very well.The new method is an improvement on the conventional method based on Connolly's equation.
【Fund】: 国家863课题项目(2006AA0AA102)资助
【CateGory Index】: P631.44
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