for wells with production history, the modern production decline analysis can be applied to yielding the formation parameters, and the semi-log figure of normalized time vs . normalized pressure is taken as the criterion to validate the calculated results 对具有生产记录的气井,可以采用现代产量递减分析方法反求地层参数,并用标准化时间和标准化压力半对数图,作为检验计算结果正确与否的标准。