TY JOUR TI Comprehensive analysis of Astrakhan gas processing plant fuel oil KW fuel oil KW comprehensive analysis KW raw material component KW Astrakhan gas processing plant KW component composition KW hydrocracking KW catalytic cracking KW visbreaking JO Oil and gas technologies and environmental safety AU Pivovarova, N.. AU Tatzhikov, A.. AU Salnikova, T.. AU Krasilnikova, O.. PY 2026 IS 2026 PB Astrakhan State Technical University