TY JOUR TI Regional distribution patterns of resins and asphaltenes in Western Siberia oils KW asphaltenes KW resins KW oil KW Jurassic-Cretaceous deposits KW Western Siberia JO Vestnik of geosciences AU Borisova, L.S. PY 2025 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"