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相态恢复理论目前已成为开发相态理论中的重要组成部分，相态恢复是推算原始相态特征的重要手段。柯克亚西七二带油环凝析气藏早期由于放喷失控，未取得有代表性的流体样品,因此原始相态很难确定。文章采用相态恢复的方法对气顶和油环进行相态恢复研究，推算出原始条件下气顶和油环的相态特征，对目前气顶和油环PVT测试进行拟合和相平衡检验，认为原始条件下气顶和油环仍是处于相平衡的。相态恢复研究为柯克亚西七二带油环凝析气藏开发分析提供了基础数据，同时对同类型油气藏的开发也具有指导意义。

STUDY ON PHASE BEHAVIOR FEATURES OF CONDENSATE GAS RESERVOIRS IN WEST KEKEYA 72 BELT OIL RING 1)

The phase behavior-restoring theory has become the important part of the phase behavior theory on production now. The phase behavior restoring is the important tool to get the original phase behavior features. It is difficult to determine the original phase behavior because the representative fluid samples have not been obtained due to the condensate gas reservoir in West Kekeya 72 belt ring lost control and blown out in the early stage. With phase behavior restoring method, the study on phase behavior restoring is conducted for the gas cap and the oil ring. The phase behavior features of the gas cap and the oil ring under the original situation are derived. The fitting and phase balance verification of the current PVT tests of the gas cap and the oil ring is conduced. It is thought the gas cap and the oil ring was in the status of phase balance under original conditions. The phase behavior restoring study provides the basic data for the performance analysis of the condensate gas reservoir in West Kekeya 72 belt oil ring and makes the references for the development of similar oil/gas reservoirs.