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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。
The formation process of shallow gas reservoirs in Hangzhou area is analyzed from the perspective of geologic origin, and the original zoning characteristics of reservoirs are discussed. It is considered that the change range of suction in sand gas in the shallow gas enrichment zone Large, initial occurrence of moisture content is generally close to the residual moisture content, generally in the residual water content. Based on the gas-soil-water characteristic curve described by VG model, an engineering prediction method for indirectly obtaining unsaturated parameters of reservoir sand is proposed. The results of the comparative tests show that the VGM model, the Parker model and the exponentiation strength formula can effectively predict the unsaturated parameters such as water seepage coefficient, gas permeability coefficient and shear strength of shallow gas sands, Take prevention and control measures to eliminate the need of shallow-gas geological disasters.