Character of the water-helium field of the Rybinsk adartesian basin, Krasnoyarsk Territory, has been described. The statistic processing of data and correlation analysis have shown that distribution of He in the underground waters of the zone of active water exchange is due to structure-tectonic and hydrodynamic factors. As the waters of the regional aquifer move from catchment area to the discharge zone, they become richer in He, which makes the water-He field more contrast. The sites limited by He isoconcentrates of 2x10(-4) ml/l are characterized by the upwelling of ground waters. An approach to the quantitative differentiation of factors in the formation of a water-helium field has been proposed and tested.
