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The origin and quality of groundwater in the Southeastern region (belongs to Southern Plain) were identified by using isotopic techniques and geochemical analysis. Groundwater samples were collected from 7 aquifers: the Holocene, upper Pleistocene, middle Pleistocene, lower Pleistocene, upper Pliocene, middle Pliocene and Miocene aquifers. The water isotopic compositions (H and O) were determined to elucidate the origin and the interaction between surface water and groundwater studies. Transit time (age) of the groundwater samples was determined to explain the direction of groundwater flow. The dating techniques included H and C isotopes measurement, followed by a correction for the initial C-activity by the C-composition (C) in TDIC (Total Dissolved Inorganic Carbon). Geochemical parameters of the groundwater samples were measured either directly in the field or in the laboratory. The results showed that the groundwater from the Holocene and upper Pleistocene aquifers was most recharged from the local meteorological and hydrological systems, including local precipitation, river and reservoirs. Thus, it has short transit time and its stable isotopic composition is spread around the local meteoric waterline and lines for rivers or reservoirs water. The groundwater in the deeper aquifers: middle and lower Pleistocene, and Neogene aquifers has old age up to 22.5 ka BP. Its water seems to be recharged from the areas with an altitude from 600 to 700 m higher to the Neogene deposit layer altitude. The groundwater in the SE SP (South-Eastern Southern Plain) region has a high quality. The water type is Na-Ca-Mg-HCO3 with low content of chloride and TDS (Total Dissolved Solids). Calcite/dolomite and gypsum dissolution, organic matter decomposition and sequence of red-ox reactions proceeding through different electron acceptors sediment were controlled the chemistry of the groundwater in the study region.

Genesis and Quality of Groundwater in the Southeastern Region of Southern Vietnam