The novelty of this paper is to provide a detailed study of the effect of oil blend composition on conditions and nature of wax deposition based on a developed formation oil model. In addition, this work also proposes a phase equilibrium diagram for given conditions, which play a pivotal role in predicting and measuring wax formation. The paper presents the results from the modeling of the formation of organic deposits, through the processes of simulation using the PIPE SIM software together with Multiflash Wax module. The work studies the effect of high-wax oil components on conditions and nature of wax solidification based on the developed formation oil model. Plotting of the phase diagram of the hydrocarbon system allowed us to determine the value of the wax appearance temperature (WAT), which was confirmed by laboratory studies. Changes in the molecular mass of organic deposits during wax crystallization were established.