Oil reservoir type gas storage gas drive reservoir parameter lower limit determination method and system

The invention relates to the field of oil exploitation, gas injection development and gas storages, in particular to a method and system for determining the lower limit of gas drive reservoir parameters of an oil reservoir type gas storage.The method comprises the following steps that a Kozeny-Carman model is corrected and improved, and an improved Kozeny-Carman model is obtained; unsteady-state seepage, a slippage effect, a distribution function, a molecular free path and the improved Kozeny-Carman model are combined, and a porosity and permeability relation model between the permeability and the effective porosity of the gas drive reservoir of the oil reservoir type gas storage is obtained; fitting is conducted according to the calculation result of the porosity and permeability relation model and measured data, and the lower limit of the gas drive reservoir parameters is determined according to the fitting result. According to the method, the defect that the gas drive process is not considered when traditi