Digital rock physics is the bridge that connects the pore-scale physical processes with macroscopic rock physical properties. Its key paradigm is to image and digitize the pore space and mineral matrix of rock and then numerically simulating the response of various physical fields to obtain effective elastic properties of digital rocks. In this paper, a new approach is proposed to acquire modulus of two-phase medium based on the first-order velocity and stress equations of the Biot theory, we use staggered-grid high-order finite difference(FD) algorithm to solve the equations, which is easy to understand and implement, taking less memory and making up the weakness of the conventional rock physics experiment with long periods, high costs. Using this technology, it's possible to model the dynamic wave propagation, and record the time-delay of the peak amplitude caused by the inhomogeneous structure of the digital rock sample by setting two different models. With the time-delay one can estimate the effective velocity and therefore also the corresponding elastic moduli. Additionally, we demonstrate that numerical simulated results agree well with the experimental results by the comparison between the both, which verify the validity of the method. Also, the equivalence conditions between this method with the theoretical rock physics models are inferred.
Presentation Date: Tuesday, September 26, 2017
Start Time: 11:00 AM
Location: Exhibit Hall C/D
Presentation Type: POSTER
