Numerical Modeling of CO2 Sequestration in Coal-Beds with Variable Saturation

G. Liu, and A. V. Smirnov
Mechanical and Aerospace Engineering Department, West Virginia University, Morgantown, WV, USA

In this study, a computer simulation was conducted with the purpose of predicting the carbon dioxide transport in two phases in a multi-layer environment of a typical non-mineable coal-bed basin based on the variable saturation model.

The results indicate that the transport of carbon dioxide was affected by the properties of the seal layers.

With carbon dioxide injection, the porosity, relative permeability, and saturation of the gaseous CO2 phase were shown to increase, which contributes to the storage capacity of the coal seam, due to a decrease in residual methane in the coal matrix. Thus, increasing the CO2 injection pressure and the consequent reduction in the amount of residual methane contributes to increase the CO2 storage capacity of the reservoir.