榆林气田南区储气库建设微观可视化渗流模拟研究

Studies on Microscopic Simulation of Visual Percolation in Underground Gas Storage in South Yulin Gasfield

根据榆林气田山3/2储层孔隙结构特征，设计了具有储层岩石孔隙系统的真实标配性及相似几何形态的微观仿真玻璃模型．模拟地层条件下枯竭砂岩气藏改建储气库注采运行过程；试验直观地揭示了地层条件下储气库气、水两相的微观分布及渗流特征。研究结果表明：枯竭砂岩气藏改建储气库多次注采后库容动用程度有所增加；但由于储层非均质性、毛管压力、气水互锁等因素影响，造成储层气相渗流能力降低，影响了库容动用效果。

According to the characteristics of Shan23 reservoir pore structure in Yulin gasfield,microscopic simu- lation glass model is designed,with a real system of reservoir rock pores and similar geometric shape,to simulate injection-production process under formation conditions of a reconstructive gas storage from a depleted sandstone gas reservoir. The test directly reveals the characteristics of microscopic distribution and percolation of gas-ware, two-facies in the underground gas storage. Research results show that the ratio of the producing storage capacity is improved after repeated injection in the reconstructive gas storage from the depleted sandstone gas reservoir. The gas-phase percolation capability of the reservoirs is decreased due to the impact of the reservoir＇s hetero- geneity, capillary pressure, gas-water interlock and other factors. It affects the storage capacity utilization effect.