Wang Xiaojie1,2,3, Luan Xiwu1,2,3, Wang Yanguang4, Liu Haojie4
1. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao, Shandong 266071, China;
2. Laboratory for Marine Mineral Resource Geology and Exploration Function, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China;
3. Qingdao Institute of Marine Geology, Qingdao, Shandong 266071, China;
4. Shengli Geophysical Research Institute of SINOPEC, Dongying, Shandong 257022, China
Abstract：Various wave propagation and attenuation characteristics in viscoelastic medium were analyzed without approximating the exact Zoeppritz equation, which cannot be used for inversion. Shen Zhanghong deduced the reflection coefficient approximate equation of viscoelastic medium in the background of fully elastic medium. The real part of the equation is fully elastic, and the imaginary part is viscoelastic. So it cannot be used in real data. We deduce in this paper reflection coefficient approximate equation of viscoelastic medium in the background of viscoelastic medium. Based on this and Bayesian prestack seismic inversion, the inversion of P-wave velocity, S-wave velocity and density is extended to the joint inversion of P-wave velocity, S-wave velocity, density, and Q value. We put forward the approximate equation of viscoelastic medium, and then the inversion equation according to the Bayesian theory. Finally, the conjugate gradient method is used to solve the inversion equation, and then the P-wave velocity, S-wave velocity, density, and Q value are obtained. Model and real data tests show that reservoirs are better predicted with P-wave velocity, S-wave velocity, density, and Q value obtained by the proposed joint inversion.
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