Abstract
Arising from the soakage of mine water pumped from a coal mine in the Kent coalfield which underlies the Chalk of East Kent in England, an area of 27 km 2 of a Chalk aquifer has become contaminated with saline water having concentrations of chloride as high as 5000 mg/l. Twenty-six Schlumberger vertical electrical soundings were made as part of a hydrogeological study of the area. Interpretation of the VES data showed a spatial variation in contamination of the aquifer which correlated closely with data obtained from boreholes. Laboratory measurements of effective porosity and resistivity of Chalk core samples were made and the form of Archie's formula was determined. A synthesis of the surface geophysical, hydrochemical and laboratory data led to quantitative mapping of formation water salinity in the fully saturated aquifer.
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