Water invasion type gas storage capacity parameter calculation method

The invention relates to a storage capacity parameter calculation method for a water-invaded gas storage. The method comprises the following steps: acquiring an initial storage capacity parameter of the water-invaded gas storage; acquiring an injection-production storage capacity parameter of the water-invaded gas storage when the injection-production period is finished; the accumulated gas quantity change of the water-invaded gas storage at the end of the injection-production period is obtained; according to the initial reservoir capacity parameter, the injection-production reservoir capacity parameter and the cumulative gas quantity change, reservoir capacity parameter change of the injection-production period is calculated; and according to the reservoir capacity parameter change, multi-cycle reservoir capacity parameters of the water-invaded gas storage are calculated. The quantitative change of the gas storage space of the underground gas storage is calculated based on the water invasion variable quantit