Multiscale modelling of microcrack-induced mechanical properties in shales
Conference Paper
Overview
Overview
abstract
Copyright 2018 ARMA, American Rock Mechanics Association. Understanding the poro-mechanical properties of tight rocks such as shale sediments is critical and relevant in many disciplines including petrophysics, hydrology, and subsurface engineering. Due to the presence of various sources of heterogeneities, spanning across multiple length scale, these formations are suitable for multiscale modelling framework. As one of the source of heterogeneity, microcrack growth serve as an important mechanism in the inelastic and fracture behavior at the macroscale. To this end, a probabilistic four-level multiscale framework is utilized for computation of homogenized and damaged behavior at macro scale propagating uncertainty at different length scale. A micromechanics based damage model is presented within the framework of Linear Elastic Fracture Mechanics (LEFM) in which the damage evolution is represented by evolution of global crack density parameter for isotropic distribution of microcracks in transversely isotropic medium. A Monte Carlo simulation is performed to quantify the uncertainty in the model response stemming from uncertainties associated with model parameters at different length scale.
