*5.1.4 Clay content*

Total clay content directly relates to the effect of pore size on rate and amount of imbibition. Due to small pore size of clay-rich rocks, higher clay content in a formation results in smaller pore sizes thus greater imbibition. This position is confirmed by Zhou et al. [80] who performed several experimental and numerical analyses on the Horn Shale gas formation and concluded that high clay content in a formation leads to high volumes and rates of imbibition respectively.
