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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Frequency-dependent electrical characterization of rock types from Ewekoro, Eastern Dahomey Basin, Nigeria
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Frequency-dependent electrical characterization of rock types from Ewekoro, Eastern Dahomey Basin, Nigeria

机译：尼日利亚东部大梅西盆地ewekoro岩石类型的频率依赖电气特征

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摘要

Dielectric measurements (40 Hz-110 MHz) conducted on samples of limestone and its associated rocks from Ewekoro, Eastern Dahomey Basin, Nigeria has yielded vital information for characterization. Cole-Cole plots manifest a distribution of relaxation times in the rock samples common for multicomponent systems. All the rock types show dielectric dispersion in dry and partially saturated conditions, but the frequency range differs for the rock types and depends on wettability. At partial water saturation there is: (i) enhanced polarization resulting in increase in real and imaginary permittivities; (ii) shortened region of dielectric dispersion; (iii) broadened electrode polarization plateau; and (iv) steeper and shorter dispersion region. Irrespective of the state of the rocks, dielectric parameters for shale and glauconite are at least an order greater than for limestone and sandstone. Geometric or textural effects are partly responsible for the observed differences coupled with the presence of charged clay/clay-like particles in shale and glauconite. Decrease in relaxation and critical frequencies in partial saturation for shale in contrast to the increase in these frequencies for the other three rock types is due the effect of pore geometry on overall dielectric relaxation. This study shows that dielectric measurement can complement geochemical analysis in laboratory evaluation and characterization of rock raw materials.
机译：在尼日利亚东部大型盆地Ewekoro的石灰石样本和其相关岩石上进行的介电测量（40 Hz-110MHz）已经产生了表征的重要信息。 COLE-COLE绘图表明，在多组分系统常见的岩石样品中表现出弛豫时间的分布。所有岩石类型都在干燥和部分饱和条件下显示了介电分散体，但频率范围对于岩石类型而异并取决于润湿性。在部分水饱和度时，存在：（i）增强的极化导致了真实和虚构的兴高率增加; （ii）介电分散区域缩短; （iii）扩大电极极化高原; （iv）陡峭和较短的分散区域。无论岩石的状态如何，页岩和肺藻岩的介电参数至少比石灰石和砂岩的顺序。几何或纹理效果部分原因是观察到的差异，其与页岩和青光藻酸盐中的带电粘土/粘土状颗粒的存在。与其他三种岩石类型的这些频率的增加相比，放松的放松和临界频率的放松和临界频率降低，这是由于孔几何形状对整体介电松弛的影响。该研究表明，介电测量可以在实验室评估和岩石原料表征中补充地球化学分析。

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