Estimation of S-wave velocity and anisotropic parameters using fractured carbonate rock physics model

Carbonate rocks with high angle fractures can be equivalent to HTI media (Horizontal Transverse Isotropic). This paper put forward the flowchart to integrate rock physics model in layered fractured carbonate rocks. It focused on the study of jointing cracks and fractures into the isotropic background media by Hudson's model and Schoenberg's model, and made an analysis of anisotropic parameters variation with P wave to S wave velocity ratio when fracture filled with different fluids. The next step was to show the influence which was induced by fractures density and fracture fluid on seismic reflectivity coefficient. And it also aimed to accomplish fluid filling work in fractures space using Brown and Korringa's generalized Gassmann equations. Then we calculated P wave, S wave velocity and anisotropic parameters in carbonate rocks which jointed fractures and saturated fluid. At last, the paper discussed the accuracy of the parameters estimation method based on fractured carbonate rock physics model. The estimated S-wave velocity was consistent with the log value. And the estimated anisotropic parameters could describe the fractured reservoir location.