AVO forwarding modeling in two-phase media: multiconstrained matrix mineral modulus inversion
Lin Kai1, He Zhen-Hua1, Xiong Xiao-Jun1, He Xi-Lei1, Cao Jun-Xing1, and Xue Ya-Juan2
1. Key Lab of Earth Exploration & Information Techniques of Ministry of Education, Chengdu University of Technology, Chengdu 610059, China.
2. College of Communication Engineering, Chengdu University of Information Technology, Chengdu 610225, China.
Abstract：
AVO forward modeling is based on two-phase medium theory and is considered an effective method for describing reservoir rocks and fluids. However, the method depends on the input matrix mineral bulk modulus and the rationality of the two-phase medium model. We used the matrix mineral bulk modulus inversion method and multiple constraints to obtain a two-phase medium model with physical meaning. The proposed method guarantees the reliability of the obtained AVO characteristicsin two-phase media. By the comparative analysis of different lithology of the core sample, the advantages and accuracy of the inversion method can be illustrated. Also, the inversion method can be applied in LH area, and the AVO characteristics can be obtained when the porosity, fluid saturation, and other important lithology parameters are changed. In particular, the reflection coefficient amplitude difference between the fast P wave and S wave as a function of porosity at the same incidence angle, and the difference in the incidence angle threshold can be used to decipher porosity.
LIN Kai,HE Zhen-Hua,XIONG Xiao-Jun et al. AVO forwarding modeling in two-phase media: multiconstrained matrix mineral modulus inversion[J]. APPLIED GEOPHYSICS, 2014, 11(4): 395-404.
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2014, Vol. 11 
