关键词: 异常高压气藏, 岩石变形, 水侵, 物质平衡方程, 地质储量, 计算方法

Abstract: A new method for estimating the original gas in place(OGIP) of over-pressured gas reservoir with aquifer was proposed.This method is based on the generalized material balance principle and can be used to calculate the volume expansion terms of reservoir rock in the individual stage of pressure drop by the experimental results of reservoir rocks under supper high pressure.Considered rock deformation and natural water influx into over-pressured reservoirs,a modified material balance equation was derived by the connate water expansion equation and unsteady state water influx equation.A trial and error procedure were applied to solve this new equation.The case analysis and comparison show that this new method is reliable and effective for predicting OGIP of over-pressured reservoir with aquifer.

Key words: over pressured gas reservoir, rock deformation, water influx, material balance equation, original gas in place, calculation method