Structure and composition of the Sarailinsky depression oil source strata in territory of the Tatarstan RepublicEduard Korolev, Vladimir Morozov, Aleksey Eskin, Anton Kolchugin and Alexey KhauzkinE3S Web of Conf., 524 (2024) 03014DOI: https://doi.org/10.1051/e3sconf/202452403014