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Hydro-Carbon Contamination Study

Hydro Carbon Contamination Study : Electrical resistivity surveys have been used for many decades in hydro geological, mining and Geo-technical investigations. Considering the difficulty of imaging a resistive target in a complex geological framework an integrated approach is probably best. Godio and Morelli (1999) used a conductivity meter for reconnaissance with which to plan the GPR survey. GPR was then used and followed up with an electrical resistance tomography (ERT) survey to detect and define the lateral distribution of the hydrocarbon pollution.

GD-1O system deployed for Hydrocarbon contamination study using 2D ERI method in southern coast of India.

Interpretation for the ERT Line I : This profile runs along East -West direction which is shown in Google map.. The lithological section can be interpreted as four layer model. There are low resistivity contours up to the 1m depth from the surface in the top part of the profile indicating the presence of saturated silty sand with cobbles and pebbles. High resistivity contour suggests the presence of medium to fine unsaturated silty sand up to the 4 m depth. Saturated Oil sands generally have low resistive value than the alluvium and some of the value is overlapped between the two. The slightly low resistive value of 100- 300Ω suggest the presence of the alluvium of fine to silty sand with oil spill on the sands upto depth of around 9m. Most of the oil seepage is visible at chainage 16m and around 32 to37m. The low resistive region with contour 10-100 Ω suggest the presence of the ground water aquifer. The contrast in the resistivity of the sand at third and fourth layer. 

Interpretation for the ERT Line II : This profile runs along East West direction which is shown in Google map.The lithological section can be interpreted as four layer model. There are low resistivity contours up to the 1m depth from the surface in the top part of the profile indicating the presence of saturated silty sand with cobbles and pebbles. High resistivity contour suggests the presence of medium to fine unsaturated silty sand up to the 4.5 m depth. Saturated Oil sands generally.