High-salinity polarization of sandstones
High-salinity polarization of sandstones
复制标题
砂岩的高盐度极化
DOI：
10.1190/geo2014-0483.1
复制
发表时间：
2015
期刊：
影响因子：
3.3
通讯作者：
L. Slater
中科院分区：
文献类型：
--
作者：
A. Weller;Zeyu Zhang;L. Slater
摘要 对来自多个数据库的大量样品进行的感应极化测量表明，孔隙流体电导率在 320 至 4600mS/m 之间时极化最大值。迄今为止，高于该盐度的有限测量表明复数电导率 (σ′′) 的虚部有所减少，这种行为迄今为止在最近提出的双层极化模型的数学公式中尚未得到充分考虑。我们测量了四个始新世砂岩样品在较宽范围的孔隙流体电导率（σw 在 25 至 15,000mS/m 之间）的复杂电导率谱的变化。当流体电导率超过 3000mS/m 时，所有样品均表现出虚电导率的大幅下降。先前提出的 Stern 层极化模型是为了拟合 σ′′ 对 σw 的依赖关系（假设有高盐度渐近线），该模型通过添加指数项进行扩展，以描述高流体盐度下的极化降低。这个数学模型有四个免费的...
ABSTRACTInduced polarization measurements on numerous samples from multiple databases indicate a polarization maximum at a pore fluid conductivity between 320 and 4600 mS/m. Hitherto, limited measurements above this salinity suggest a decrease in the imaginary part of the complex conductivity (σ′′), a behavior that has up to now not been adequately considered in the mathematical formulations of recently proposed double-layer polarization models. We measured variations in the complex conductivity spectra over a wide range of pore fluid conductivity (σw between 25 and 15,000 mS/m) for four Eocene sandstone samples. All samples exhibited a strong decrease of the imaginary conductivity for fluid conductivity exceeding 3000 mS/m. A Stern-layer polarization model, previously presented to fit the dependence of σ′′ on σw assuming a high-salinity asymptote, is extended with the addition of an exponential term to describe the polarization decrease at high fluid salinity. This mathematical model with four free pa...