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在气藏储量计算中，物质平衡方法是用得最多、计算较为准确的一类方法，而凝析气藏是一种复杂的特殊油气藏，其物质平衡方程与常规气藏相比有较大差别。为此，文章从油气藏物质平衡基本原理出发，建立凝析气藏物质平衡方程，与常规油、气藏物质平衡计算方法相比，该新方法考虑了储层流体组分及相态变化特征，并引入凝析油体积系数概念，同时考虑干气与凝析油两相因素。而且采用了相关曲线法求解，从而大大提高了凝析气藏储量计算精度。以大港千米桥板深8井为例，利用其相态数据对该新方法进行验证，计算结果表明，利用物质平衡方程计算新方法可以准确计算凝析气藏天然气和凝析油储量。

NEW CALCULATION METHOD OF MATERIAL EQUILIBRIUM EQUATION FOR CONDENSATE RESERVOIRS 1)

Material equilibrium method is most often used in the reserves calculation of gas reservoirs. And its calculating results are relatively accurate. But condensate reservoirs are special complicated gas reservoirs. Their material equilibrium equation differs from that of conventional gas reservoirs greatly. So, based on the basic principle of material equilibrium for oil/gas reservoirs, the material equilibrium equation is established for condensate reservoirs. Comparing with the material equilibrium calculating method of conventional oil/gas reservoirs, the new method considers the changing features of composition and phase state of the reservoir fluid, introduces the concept of condensate oil volume coefficient and considers the bi-phase factor of dry gas and condensate oil. The related curve fitting method is applied for solution. As a result, the reserves calculating accuracy is improved greatly. Taking well Bansheng 8 of Qianmiqiao in Dagang oil field as example, its phase state data are used to verify the new method. The results show using the new calculation method of the material equilibrium equation can accurately calculate the reserves of gas and the condensate oil for condensate reservoirs.