Study of the geochemical processes of radionuclides of oil and gas fields Tatyana Glushkova, Aleksei Kachkin, Ivan Nejmyshev, Aleksandr Talalaj and Irina Shinkaryuk E3S Web Conf., 177 (2020) 02002 Published online: 08 July 2020 DOI: 10.1051/e3sconf/202017702002