Experimental and theoretical studies of fluid-solid coupling processes of tight rock media

Abstract

**Please note that the full text is embargoed until 8/1/2025** ABSTRACT: This study covers the application of continuum mechanics in the realm of rock work in geological studies. Continuum mechanics encompasses two major branches: fluid mechanics that deals with fluid behavior, and solid mechanics pertaining to the behavior of rock media. The research focuses on comprehending the mechanical behavior of rocks as a continuous mass, offering a comprehensive perspective for analyzing geological structures, fluid flow, and rock mechanics. Under the framework of continuum mechanics applied to rock media, following the sequence of the rock/solid properties, fluid flow properties, and the fluid-solid coupling behavior, this dissertation is divided into four sections, each addressing a unique aspect of the subject matter stated above. The dissertation presents an analysis of true-triaxial hydraulic fracturing of granite samples for fluid-solid coupling processes during the rock failure, followed by an integrated technique for rapid gas permeability measurement of tight rock media. Then, this works elucidates shale wettability using a contrast-matching technique of Small Angle Neutron Scattering (SANS), investigating the heterogeneity and overturning of wettability at different pore intervals. This research is significant in the field of geo-energy stewardship, which involve fluid-solid coupling phenomena in poromechanics, includes shale petroleum development, enhanced geothermal stimulation, CO2 sequestration, H2 storage, nuclear waste repository, and underground water management.