TY JOUR TI Thermodynamic model of the deep origin of oil and its phase "freezing" KW phase diagrams KW chemical potentials KW metastable equilibria KW hydrocarbons KW fluids KW petrogenic reservoirs KW oil KW kerogen KW black shales KW regressive metamorphism KW CO2 fixation KW hydration JO Russian Journal of Earth Sciences AU Marakushev, S.A. AU Belonogova, O.V. PY 2022 IS 22 PB Geophysical Center of the Russian Academy of Sciences