Linearized Frequency-Dependent Reflection Coefficient and Attenuated Anisotropic Characteristics of Q-VTI Model

Yahua Yang, Xingyao Yin, Bo Zhang, Danping Cao and Gang Gao
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Yahua Yang: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
Xingyao Yin: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
Bo Zhang: Department of Geological Science, The University of Alabama, Tuscaloosa, AL 35487, USA
Danping Cao: School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
Gang Gao: School of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430100, China

Energies, 2021, vol. 14, issue 24, 1-18

Abstract: Seismic wave exhibits the characteristics of anisotropy and attenuation while propagating through the fluid-bearing fractured or layered reservoirs, such as fractured carbonate and shale bearing oil or gas. We derive a linearized reflection coefficient that simultaneously considers the effects of anisotropy and attenuation caused by fractures and fluids. Focusing on the low attenuated transversely isotropic medium with a vertical symmetry axis (Q-VTI) medium, we first express the complex stiffness tensors based on the perturbation theory and the linear constant Q model at an arbitrary reference frequency, and then we derive the linearized approximate reflection coefficient of P to P wave. It decouples the P- and S-wave inverse quality factors, and Thomsen-style attenuation-anisotropic parameters from complex P- and S-wave velocity and complex Thomsen anisotropic parameters. By evaluating the reflection coefficients around the solution point of the interface of two models, we analyze the characteristics of reflection coefficient vary with the incident angle and frequency and the effects of different Thomsen anisotropic parameters and attenuation factors. Moreover, we realize the simultaneous inversion of all parameters in the equation using an actual well log as a model. We conclude that the derived reflection coefficient may provide a theoretical tool for the seismic wave forward modeling, and again it can be implemented to predict the reservoir properties of fractures and fluids based on diverse inversion methods of seismic data.

Keywords: fluids-bearing fractured reservoirs; Q-VTI effective medium model; seismic attenuated anisotropic characteristics; AVOF reflection coefficient (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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