Salinization process is a worldwide constraint for soil management especially in Northeast Thailand, region characterized by widespread, deep and thick continental salt deposits. The near-surface distribution of salinity is performed using ground geophysics methods including time domain electromagnetic, frequential domain electromagnetic, vertical electrical soundings and self potential. The vertical and horizontal mapping of the electrical resistivity indicate a very conductive anomaly, situated at nearly 10 m depth owing to a 3-4 m thick clayey layer. Electrical conductivity mapping made in rainy season gives better details than the one made in dry season. Self-potential contrasts are clearly shown and are mostly due to electrodiffusion potentials. A conceptual model of the hydrosystem functioning was proposed at a local scale including two groundwater systems namely a deep saline groundwater flowing up through fractures and a shallow saline groundwater overlying a low-permeable clayey layer.


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