Marine clays are typically seen in coastal regions or beneath bodies of water and exhibit very low shear strength and notable compressibility. Due to rapid infrastructure growth beside the coastal region, numerous construction projects are undertaken worldwide in areas with marine clay soils. In Cochin, coastal regions consist of soft marine clay deposits. Marine clay undergoes foundation distress at some point in the life of the structure. Coastal zones face many foundation problems due to salt water intrusion. Due to the intrusion of seawater, geotechnical properties of clay changes in different manners. This is due to the interaction between cations in seawater and ions in clay mineral. Changes occur in the structure of soil matrix due to reduction of diffused double layer thickness as a result of replacement of cations resulting from interactions between pore fluid and clay particles. In this study, effect of pore fluid salinity on consolidation behaviour of marine clayey soils is studied in detail. Oedometer test provides information about compressibility and swelling characteristics of soil necessary for the computation of magnitude and time rate settlements resulting from one dimensional strain. Compressibility and swelling characteristics of marine clayey soils varies with pore fluid concentration resulting in change in soil structure, stability and strength. The effect of pore fluid salinity on consolidation characteristics and permeability of marine clayey soil is studied using one dimensional consolidation test. Microstructural analysis of clayey soil consolidated with different pore fluids having different concentrations was studied using scanning electron microscopy (SEM) images to analyze their morphological characteristics.