3D Digital Reconstruction of Fractured Rocks and Multi-mineral Rocks
Huaiguang XIAO+, Lei HE#
Southeast University, China

Digital rock physics is one of the most important methods to study rock mechanics and permeability properties. This method mainly includes digital rock modeling and equivalent physical simulation. Digital rock modeling is the premise to carry out high-quality equivalent physical properties simulation. Previous research has focused on digital modeling for pore structure in small-scale shales and sandstones. Moreover, the modeling for fractured rocks and multi-mineral rocks is only based on inaccurate numerical models. In order to characterize the 3D structure of fractured rocks and multi-mineral rocks accurately, the 3D discrete fracture network (DFN) and multi-mineral rock digital model are reconstructed from a single 2D surface digital image using the mathematical method. The 3D DFN digital model based on the Markov random field and physical cover method can characterize the geometric characteristics of natural fractures such as aperture, roughness and shape, and the fracture proportion in the 3D model is similar to that in the 2D model. This 3D DFN digital model can provide a reliable reference for analyzing rock permeability and mechanical stability. In addition, the 3D multi-mineral digital model based on the deep learning method can represent the geometry, distribution and mosaic relationship of natural rock grains, and the proportion of different grains in the 3D model is similar to that in the 2D model. This multi-mineral digital rock model also can provide a reliable reference for analyzing the influence of mesoscopic heterogeneity on the macroscopic mechanical response of rock.