TY JOUR TI EFFECT OF CARBONATE ADDITIVES CA AND MG ON CHANGES IN COMPOSITION AND PROPERTIES OF HEAVY OIL IN THE PROCESS OF LOW-TEMPERATURE CRACKING KW HEAVY OILS KW DOLOMITE KW CALCITE KW CRACKING KW X-RAY DIFFRACTION KW SARA KW RHEOLOGY JO Herald of Technological University AU Antonova, M.Y. AU Davletshin, A.R. AU Telyashev, R.G. AU , .. PY 2025 IS 27 PB Kazan National Research Technological University