Abstract
Near-surface geochemical prospecting studies have shown that the light hydrocarbon gases and helium can escape from the subsurface reservoirs/source rocks and migrate to the surface. Processes such as effusion and diffusion along with the secondary porosities in the rocks, sediments and soils can cause the gases to diffuse or migrate out in the atmosphere or get mixed with the ground water. Added selective references of near-surface geochemical prospecting occurrences of the surface geochemical anomalies pertaining to the seepage of natural gases indicate the possibility of hydrocarbon rich zones in the subsurface. The surface geochemical studies prove to be a cheaper and faster method to delineate potential hydrocarbon zones where detailed studies can be carried out and also these methods act as direct indicators of the micro-seepage of hydrocarbons.
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