P601 INFLUENCE OF GEOTHERMAL GRADIENT ON METHANE CONCENTRATION IN GROUND WATER MIHKEL SHTOKALENKO The All-Russian Scientific-Research Institute of Exploration Geophysics VIRG-Rudgeofizika Saint-Petersburg Russia 1 Methane is the main component of ground water gas composition below the depth of about 250 m where oxidation changes into reduction. The conditions of methane diffusion and solubility are important not only for hydrocarbon accumulation but also for upward migration of metals because ascending methane flow may be considered as a possible transport for many micro-components. Thus it may be promising to study the spatial distribution of dissolved methane within "cold" and "hot" areas of


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