By analysing the off-take potential equation and indicating curve of gas production, people know that the yield corresponding to the up warping point (at the end of the straight segment) of the indicating curve of gas production is the reasonable production under the conditions that make full use of the formation energy, the velocity is critical velocity. This paper gives a strong theory basis which could be used to calculate the reasonable production from the critical velocities of the testing reservoir rocks. In laboratory, the critical velocities of twenty-four blocks of reservoir rocks were tested and the reasonable production was calculated in the western area of Sichuan. The reasonable production has a close relation to the useful thickness, permeability and cavity. This paper gives a relation equation between reasonable production, the useful thickness and permeability and cavity by fitting the curve.%通过对气井产能方程以及采气指示曲线的分析可知：为充分利用地层能量，采气指示曲线的上翘点（直线段末端）所对应的产量即为气井的合理产量,流速即为临界流速。其结果为岩心的临界流速计算气井的合理产量提供了理论依据。在实验室中，测量出川西地区24块岩心样品的临界流速，并据此计算出该地区气井的合理产量。气井的合理产量与储层有效厚度、渗透率、孔隙度关系密切，通过曲线拟合给出了该地区气井合理产量与有效厚度、渗透率、孔隙度的关系式。
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