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Light hydrocarbons migrate from the petroleum accumulations to the Earth?s surface through faults, fractures and horizons with increased permeability. The occurrence of light hydrocarbons in the near-surface zone forms the basis for the surface geochemical methods. These methods are divided into two groups: direct and indirect. The paper presents the results of ?free-gas? method (concentrations of light hydrocarbons and non-hydrocarbon components in the soil gas samples), and also values of pH and calcite content ...