With the purpose of investigating radiation environment on the areas of oil-and-gas production, radionuclide composition of water and soil samples taken from these territories were studied. Water samples were taken from artificially formed reservoirs, canals and directly from formation waters of different depths. Only natural radionuclides 40К, 232Th and 226Ra are observed in their composition as in the composition of soil and solid wastes. Radionuclide content in the artificially formed reservoirs is insignificant and within the limits of sensitivity of applied methods of analysis. Volumetric activity of radionuclides, dissolved in formation waters of different depths change within the limits the of values (Bk/l): 226Ra (0.46-5.14), 228Ra (0.57-4.12) and 40K (0.36-4.21). Radionuclides contained in petroliferous rocks in the process of oil production rise together with formation waters from different depths accumulating on various areas and creating sites with high radiation background.