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四川盆地下二叠统缝洞型气藏为致密碳酸盐岩单一缝洞气藏，地下总空间体积不大，地层水水体有限，区域上没有连片水体存在，因而气藏中地层水弹性能量可不予考虑，地层水的产出不应视为边水或底水的侵入，而是气藏中天然气弹性驱动的结果。据此将由气水共同占据的单一缝洞气藏作为一个整体，并可认为在气水产出过程中气藏储集空间保持不变，运用物质平衡法原理推导出有水缝洞型气藏的储量计算方法Ｇ＝（Ｗｐ／Ｂｇ）＋ＧｐＰｉ／Ｚｉ－Ｐ／ＺＰｉ／Ｚｉ。对于未产气只产水的缝洞系统，通过一段时间的排水，可利用该方法判断水体上方的天然气储量。
The lower Permian fractured-cavity gas reservoirs in Sichuan Basin are single-fractured carbonate tight gas reservoirs. There is not much total underground space volume and limited water bodies in the area. There is no contiguous water body in the area, so the water elasticity The energy can not be taken into account and the production of formation water should not be considered as intrusion of edge water or bottom water but rather as a result of natural gas-elastic drive in the gas reservoir. According to this, a single fractured gas reservoir occupied by both gas and water will be taken as a whole, and it can be considered that the reservoir space will remain unchanged during gas and water production. The material balance method is used to deduce the fractured reservoir Calculation method of reserves G = (Wp / Bg) + GpPi / Zi-P / ZPi / Zi. This method can be used to judge the natural gas reserves above the water body through the drainage for a period of time.