Mass Transfer Between Matrix and Filled Fracture During Imbibition Process

The spontaneous imbibition (SI) is the spontaneous entry of a wetting fluid into a porous medium driven only by capillary forces, displacing a preexisting nonwetting fluid. As a fundamental mass transfer process, the importance of SI mechanism has long been recognized in many hydrological and geotechnical applications, such as sequestration of carbon dioxide, oil and gas extraction, and the protection of groundwater resources. This chapter focuses on the mass transfer phenomena of the imbibed water between the matrix and the filled fracture during the SI process based on the LF-NMR technology.