中文摘要：

在凝析气藏的开发过程中，当井底压力低于露点压力后，地层中会发生反凝析现象，造成反凝析污染，已有的实验方法成本较高，数值模拟方法较为繁琐。以模糊数学为理论基础，考虑了井底压力、地层压力、生产气油比等多种影响因素，利用生产动态数据来判断凝析气藏的反凝析程度，方法简捷、判断准确。实例验证了方法的可靠性，对于凝析气藏的开发具有重要的指导意义。

英文摘要：

In ＇the course of the development of condensate gas reservoir, the phenomenon of retrograde condensa- tion will happen when the formation pressure drops below the dew point pressure. This will result in the formation pollution. Currently, the cost of experimental methods is high and the numerical simulation is rather complex. A new evaluation method is established, considering the dynamic data of production. On the theoretical basis of fuzzy mathematics, considering many influencing factors such as bottom-hole pressure, formation pressure, produced gas- oil ratio and so forth, the degree of retrograde condensate can be judged by production performance data. This method is characterized by the simple and accurate diagnosis. This method is applied and its reliability is verified and furthermore possesses important guiding significance for the development of gas condensate reservoir.