  We construct a thermodynamic model for theoretical calculation of the boiling
process of multicomponent mixtures of hydrocarbons (e.g., crude oil). The model
governs kinetics of the mixture composition in the course of the distillation
process along with the boiling temperature increase. The model heavily relies
on the theory of dilute solutions of gases in liquids. Importantly, our results
are applicable for modelling the process under elevated pressure (while the
empiric models for oil cracking are not scalable to the case of extreme
pressure), such as in an oil field heated by lava intrusions.
