宏观导电机理下的泥质砂岩含水饱和度解释模型

Water saturation explanatory model of argilla-ceous sandstone under the macroscopically electric conduction mechanism

认为泥质砂岩的导电体积由两部分组成 ,即完全被束缚水占据的微孔隙 (孔喉半径小于 0 .1μm ,其中的流体不能渗流 )导电体积和有效孔隙中被可动水、束缚水占据部分的导电体积 ,泥质砂岩的整个导电响应为二者之和 ,但二者导电体的导电特性不同 ,各有其不同的几何因子。考虑成岩过程中地层水的变化和阳离子的交换吸附作用 ,提出泥质砂岩含水饱和度的双孔隙导电体积解释模型 ,模型所有特征参数均可由测井解释获得 ,并有明确的地质和物理意义 ,可与岩心数据对比。应用该模型解释胜利油区孤东油田 3口井的馆陶组泥质砂岩含水饱和度 ,解释结果与其油基钻井液取心分析的含水饱和度数据对应良好。图 2表 1参

A kind of water saturation explanatory model of argillaceous sandstone is presented, including the formation water alteration during the lithification, and the argillaceous sandstone conductive volume as micro pore conductive volume occupied by the bound water and conductive volume in the effective pore. The conductors in those two conductive volumes have different conductive characteristics and their own conductive factors, so, the total conduction of the argillaceous sandstone is the summation of those two parts. The application of this model in the oil base mud well has a good agreement between the explanation and the analysis data.