The invention relates to petroleum geology and can be used in the calculation of hydrocarbon deposits and in choosing the optimum for their development. The purpose of the invention - to increase reliability under temperature and pressure conditions close to the critical point of the system. This object is achieved in that the determined reservoir pressure, temperature, density of the system and its GOR. Sampled formation fluid and recombine them at reservoir temperature and pressure conditions and different gas factors. The obtained data were determined from the dependence of density of the system you GOR and exhibit density values which correspond to the inflection points and dependence are boundary values of the phase states of the studied system. By comparing these values with the value of the hydrocarbon density of the system at reservoir conditions is judged on its phase state. ate with
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