A novel approach to precise evaluation of carbon dioxide flow behaviour in siltstone under tri-axial drained conditions

Abstract

Since the secure storage of CO2 in any geological sink is largely dependent on its caprock and reservoir rock flow properties, it is necessary to check the permeability of both in assessing geological reservoirs for CO2 storage. Siltstone is a common rock type in both. On the other hand, the highly complicated thermodynamic properties of CO2 cause its flow behaviour through any rock mass to become highly complex. This intention of this study is to understand this complexity and to propose an accurate technique to evaluate the apparent permeability of CO2 through siltstone under laboratory conditions, considering the possible phase transitions of CO2 inside the rock mass. A series of tri-axia..