Microscopic Characterizations of Heterogeneous Pores, ITZs, Multiple‐Solids, and Their Impacts on Damage Property of Sandstone by Low‐High Resolution 3D Reconstruction
Zhi Zhao, Xiaoping Zhou
Abstract
Abstract Heterogeneity representations of rocks can bring out large errors due to inaccurate partitions of different phases. This study aims to deeply characterize the microscopic heterogeneity in rocks represented by different phases and to study their effects on damage properties of sandstone. X‐ray μ‐CT imaging with low‐high resolution is applied to capture microstructures information. Digital analysis with statistical models is employed to accurately characterize the heterogeneity. The effects of microscopic heterogeneity on the damage properties are analyzed using the numerical simulations and coupling multiple point statistic‐marching cube three‐dimensional reconstruction algorithm. Results show that the microscopic heterogeneity of sandstone can be effectively characterized by Lorentz distribution model, and model with high resolution shows better R 2 values. With increasing segmentation accuracy of microscopic phases, micro‐grain‐2 phase plays decisive roles in determining the compressive strength of sandstone. The microscopic samples S1‐S2 are failed by the mixed modes of transgranular and intergranular failures.