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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Experimental determination of permeability of Neapolitan Yellow Tuff
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Experimental determination of permeability of Neapolitan Yellow Tuff

机译：那不勒斯黄凝灰岩渗透性的实验测定

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摘要

This paper presents and discusses the measurement of permeability of Neapolitan Yellow Tuff (NYT) samples obtained in the framework of a study concerning the phenomenon of bradyseism, i.e. the slow vertical movement of soil, in the Campi Flegrei caldera (Campania—Italy). Measurements have been performed under isothermal, non-isothermal and transient non-isothermal conditions using a specifically designed apparatus. Results of measurements of porosity of different samples are also reported. Experimental results in isothermal conditions show that the volume flux through the samples changes linearly with applied pressure. The values of permeability obtained turn out to be independent of the temperature and pressure gradients applied to the samples. This result is consistent with the fact that the permeability is a characteristic of the porous medium, and as such is not affected by temperature and pressure variation, at least in the range examined. The permeability values measured in our laboratories agree quite well with the ones measured in situ by the Agenzia Generale Italiana Petroli (AGIP) during a geothermal exploration of the Campi Flegrei area in 1980. An interesting, still unexplained phenomenon has been detected during transient phases when both pressure and temperature gradients were applied to the samples. The phenomenon consists in an enhancement of volume flux due to heat flux in the transient phase. The extra volume-flux disappears once the steady temperature gradient is reached.
机译：本文介绍并讨论了在坎皮弗莱格雷火山口（意大利坎帕尼亚-意大利）关于缓震现象（即土壤缓慢垂直运动）的研究框架下获得的那不勒斯黄凝灰岩（NYT）样品的渗透性测量。已经使用专门设计的设备在等温，非等温和瞬态非等温条件下进行了测量。还报告了不同样品的孔隙率测量结果。等温条件下的实验结果表明，通过样品的体积通量随施加的压力线性变化。事实证明，所获得的渗透率值与施加到样品的温度和压力梯度无关。该结果与以下事实一致：渗透性是多孔介质的特征，因此至少在所检查的范围内不受温度和压力变化的影响。在我们的实验室中测得的渗透率值与1980年在Campi Flegrei地区进行地热勘探时由Agenzia Generale Italiana Petroli（AGIP）现场测得的渗透率值非常吻合。在瞬态阶段发现了一个有趣但仍无法解释的现象。压力和温度梯度都施加到样品上。该现象在于过渡阶段的热通量引起的体积通量的增加。一旦达到稳定的温度梯度，多余的体积流量就会消失。

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