The Power of Characterizing Pore-Fluid Distribution for Microscopic CO2 Injection Studies in Tight Sandstones

The microscopic structure of low-permeability tight reservoirs is complicated due to diagenetic processes that impact the pore-fluid distribution and hydraulic properties rocks. As part an ongoing study carbon dioxide-enhanced oil gas recovery (CO2-EOR/EGR) CO2 sequestration, this research article adopts integrated approach investigate contribution micropore system in sandstones. A new dimensionless number, termed confinement index (MCI), was established select right candidate for injection formations. Storativity containment indices were essential MCI estimation. set experiments, including routine core analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), mercury capillary pressure (MICP), nuclear magnetic resonance (NMR), performed on three sandstone rock samples, namely Bandera, Kentucky, Scioto. Results indicate presence fibrous illite acting as pore bridging Bandera Kentucky samples reduced micropore-throat proportion (MTMR), leading a significant drop 1.03 0.56, respectively. Pore-filling kaolinite booklets storativity (MSI) 0.48 0.38 Bandera. On other hand, absence Scioto led highest capability 1.44 MTMR 0.5 MSI store confine fluids. Therefore, best storage among tested 0.72 MCI.