Effect of Fluid Properties on Elastic Parameters of Fractured Rock Based on Digital Rock Technology
Knowledge of the elastic properties of fractured rock plays a significant role in accurate and rigorous reservoir identification and description. In this paper, we carry out a systematic study about the effect of fluid properties on elastic properties of fractured reservoir rocks based on digital rock technology. Digital fractured rock model is reconstructed via a superposition reconstruction procedure which imposes a fracture on an isotropic host rock. A modified finite element method (FEM) is adopted to investigate rock elastic properties. The results show that the five elastic constants of the resultant TI medium are derived as a function of the fluid properties. The aspect ratio of P wave velocity and S wave velocity (Vp/Vs) is a function of fluid bulk modulus and can be used to identify fractured gas reservoir. The results allow one to have a better understanding about the correlations of fluid and elastic properties of reservoir rocks.
KeywordsDigital rock technology Elastic parameters Fractured rock Fluid property