Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/2612
Authors: | Peluso, F.* Arienzo, I.* |
Title: | Experimental determination of permeability of Neapolitan Yellow Tuff. | Journal: | J. Volcanol. Geoth. Res. | Series/Report no.: | / 160 (2006) | Publisher: | Elsevier | Issue Date: | 2006 | DOI: | 10.1016/j.jvolgeores.2006.09.004 | Keywords: | Campi Flegrei hydrothermal systems; resurgent calderas porous media hydraulic permeability |
Subject Classification: | 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks |
Abstract: | 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. |
Appears in Collections: | Article published / in press |
Files in This Item:
WEB OF SCIENCETM
Citations
15
checked on Feb 10, 2021
Page view(s) 50
185
checked on Apr 24, 2024
Download(s)
25
checked on Apr 24, 2024