Numerical simulation based on prestack diffusive-viscous wave equation
Hu Junhui1,2, Wen Xiaotao1, Yang Xiaojiang3, He Zhenhua2, Sun Yao1,2, Chen Cheng1,2, Chen Renhao1,2
1. Key Laboratory of Geodetection and Information Technology, the Ministry of Education, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
3. Shenzhen Branch, CNOOC Ltd., Guangzhou, Guangdong 510240, China
Abstract：Low-frequency shadow in seismic data has a close relation with fluid reservoirs. The diffusive-viscous theory can extremely simulate the relationship between them. We combine prestack wave equation numerical simulation with this theory, and analyze quantitatively impacts of different coefficients in diffusive-viscous theory on seismic response. The following observations are obtained: 1Seismic energy, especially high-frequency component, attenuates with the increase of viscous coefficient; 2Seismic energy attenuates with the increase of diffusion coefficient, but this attenuation has no relations with frequency; 3The smaller quality factor Q is, the bigger phase shift seismic wave has. We calculate qualitative relationships between low-frequency shadow, diffusion, viscous, and reservoir thickness based on this analysis. In addition, this paper discusses the formation mechanism of low-frequency shadow, phase velocity dispersion equation, and seismic wave tuning for thin reservoir identification.
