Abstract
Analytical models for interpretation and correlation of the effects of clay swelling on the permeability and porosity of clayey porous rocks are developed and verified by experimental data. The parameters of the models, including the swelling rate constants, and terminal porosity and permeability that will be attained at saturation, are determined by correlating the experimental data with these models. This study reveals that swelling of clayey rocks is essentially controlled by absorption of water by a water-exposed surface hindered diffusion process and the swelling-dependent properties of clayey rocks vary proportionally with their values relative to their satu-ration limits and the water absorption rate. These models lead to proper means of correlating and representing clayey rock properties, and enhanced understanding of the relevant processes.