INDUCED POLARIZATION EFFECTS AS INDICATORS OF HYDROCARBON POLLUTION OF GROUNDWATER
V. Yu. Zadorozhnaya and A. D. Bessonov
Keywords: Groundwater pollution, TEM soundings, induced polarization, resistance, polarizability, S version, mathematical modeling.
Pages: 1124-1136
Abstract
Time-domain electromagnetic (TEM) soundings were performed in the vicinity of a plant in Saratov town, Russia, to detect hydrocarbon pollution of groundwater and to trace possible pollution flows in drainage zones. The presence of hydrocarbons in rocks is indicated by high electrical resistance and induced polarization (IP) effects found in many TEM curves. Calculations show that the polarizability  is the ratio of the excess electrical conductance to the electrical conductance in pores. Relaxation time was found to be controlled mainly by the radius of pores in water-saturated sediments. IP effects can be recorded by TEM soundings in wet sediments with imperfect phase relationships if the pore radius is the in the range of 10 |
