The recent decades have proven that every system has to be analysedwith system models before practically applied in real field in order to study the model and optimum work to be done. In this case, Petroleum industry has been evolved since technology and development have been upgraded significantly. In petroleum production field, simulation programs contribute significant role in order to analyse, synthesize and rejuvenate new methods and enlightening previous acceptabel methods to enhance production and sustain capability of the reservoir. In thid research project, a firled of Thrace Basin was chosen which also a gas condensate reservoir.