CONTROLLING FACTORS TO THE DISTRIBUTION OF SALINITY OF POREWATER IN QUATERNARY MARINE SEDIMENTS IN NAM DINH AREA

Abstract

This paper presents the results of studies and analysis, assessment the controlling factors to the distribution of salinity (mainly NaCl) in the Quaternary marine sedimentary in Nam Dinh area by using a combination of different methods such as boreholes logging, undisturbed sediment sampling, pore water squeezing, analysis of chemical and stable isotope compositions of pore water.
Based on the correlation between concentration of Cl-, Na+ ions and NaCl versus electrical conductivity of marine sediment at different depth according to geophysical borehole results determine the distribution of concentration of salinity (NaCl) of pore water at different depths. In addition, results from the analysis of stable isotopes δ18O and δ2H of porewater in the marine sedimentary layer show the mixing of marine water and meteoritic water in the sediments. Distribution of NaCl of marine sediments is due to difference in density and molecular diffusion.

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