中文摘要：

从地质成因角度分析了杭州地区浅层气藏的形成过程，探讨了储层土体的原始赋存分带特征，认为规模气藏中位于浅层气富集带内砂土的吸力变化范围不大，初始赋存含水率大致与其残余含水率接近，一般处于残余含水状态。基于VG模型描述的储气砂土-水特征曲线，提出了间接获取储层砂土非饱和参数的工程预测方法。对比试验结果表明：借助VGM模型、Parker模型和乘幂形式的强度公式，能够有效地预测含浅层气砂层的渗水系数、渗气系数和抗剪强度等非饱和参数，可满足地铁工程超前采取防治措施、消除浅层气地质灾害的需要。

英文摘要：

In view of geological origin, the formation of shallow gas in Hangzhou area was analyzed; and the original occurrence zonation characteristic of reservoir soil is investigated. It is shown that matric suction variation range of the gassy sand in enriched zone of scale gas reservoirs is not large, and its initial occurrence water content is close to its residual water content that means it is usually at the state of residual water content. Based on soil-water characteristic curve of the gassy sand described by Van Genuchten （VG） model, the indirectly engineering predictive methods to obtain unsaturated parameters of gassy soil are proposed. Results compared between the prediction and the experiment show that using Van Genuchten and Mualeum （VGM） model, Parker model and strength formula described by the power function, it is effective to predict the unsaturated parameters such as water and gas permeability coefficients, and shear strength of the reservoir soil, which can meet the need of preventive measures taken before metro construction to eliminate the shallow gas geological hazards.