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在我国已发现的低渗透天然气藏中，Ⅲ类储层的储量占了相当大的比例，高者可达30%。随着气藏的深入开发，压降漏斗加深扩大，Ⅲ类储层的生产压差也越来越大，从而会有更多的Ⅲ类储层储量被逐步动用，这部分资源对产能的贡献将越来越大。在气藏开采周期里，为了定量研究Ⅲ类储层资源对气藏生产总产能的贡献及其最终采收率，为现场生产规划、投资决策提供可靠的技术支持，文章利用磨溪气田雷一1低渗气藏磨18井区的气藏描述成果和实际生产测试资料，通过数值模拟技术，建立了该井区低渗透气藏的单井模拟模型，在生产历史拟合研究的基础上，预测计算了未来开发动态指标，详细分析了Ⅲ类储层储量对产能贡献的变化趋势，定量地研究了Ⅲ类储层对产能的贡献和最终采收率，这对现场生产规划、管理和投资决策具有现实的指导意义。

Contribution of Third Class Reservoirs to Productivity of Low Permeable Gas Pools

In the found low permeable gas pools of China, the third class reservoirs account for a large proportion, even up to 30%. The reserves in the reservoirs must have contributed to the productivity of the gas pools undoubtedly. As the gas pools are exploited further, the pressure cone of depression will grow, and the producing pressure drop of the third class reservoirs will increase more and more, the reserves of the third class reservoirs will be mobilized gradually, and the reserves will contribute to the productivity more and more. In the gas pool exploiting lifecycle, to quantitatively study the contribution of the third class reservoirs to the productivity of the gas pool and the ultimate recovery factor, and in order to provide reliable technical supports for the field production program and the investment decision, using the gas pool describing results and the real production test data of well Mo 18 region of Lei 1 low permeable gas pool in Moxi gas field, with numeral simulation technology, the simulating model of single well for low permeable gas pool of the well region is established. Based on the producing history fitting, the coming production performance indexes are predicted, the changing trend of the contribution of the reserves of the third class reservoirs to the productivity is analyzed in detail, and the contribution of the third class reservoirs to productivity and the ultimate recovery factor is studied quantitatively, which can be used to guide the field production program, management and investment decision.