异常高压气藏地质储量计算新方法

A new method for the reserves calculation in abnormal high pressure gas reservoir

由于压力的下降, 导致异常高压在气藏开发过程中储层岩石呈现再压实特征, 致使岩石的有效压缩系数发生变化, 从而使物质平衡方程式中Ce发生改变, 导致气藏地质储量计算不够准确。因此,从物质平衡方程式出发, 建立以G和Ce为未知变量的新方程, 通过非线性回归方法求出最佳解。由于该方法所需参数较少且方法简单, 精度较高, 在气藏开发中具有较强的实用性。

In the middle of development process of overpressured gas reservoir,drawdown can lead to reconsolidation characteristic of reservoir rock,change of effective compressibility C_p and C_e of material balance equation, thus lead to inaccuracy of initial gas in place(IGIP) in gas reservoir. On account of these, based on material balance equation this paper establishes a new equation with variable of G and C_e, and gets optimal solution through nonlinear regression method. On account of lesser parameters, straightforward method and higher precision, this method has a strong practicability in the middle of development of gas reservoir.