以正常压力系统封闭气藏的物质平衡方程序为基础，建立一种利用累积产气量计算气藏地层压力的方法。
On the basis of the material balance equation, this paper develops a method to predict the formation pressure using cumulative production data for normal pressure confined gas reservoir.
在自由交替带地下水供排平衡，保持正常的地层压力。
In free replacing zone, Me pressure keeps normal because recharge and discharge of pore fluids is in equilibrium.
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