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Terrain conductivity is a geophysical technique which, by inducing current into the ground, can measure the conductivity of subsurface soils and interstitial waters. Hydrocarbons are not conductive materials and, because the surrounding lithology behaves to a certain extent as a conductor, the presence of pooled hydrocarbons floating on groundwater can be determined by the use of a terrain conductivity survey. Two case histories are presented in which terrain conductivity measurements were used to determine the extent and thickness of subsurface hydrocarbon plumes.

DELINEATION OF SUBSURFACE PETROLEUM SPILLS USING TERRAIN CONDUCTIVITY MEASUREMENTS