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Experimental determination of permeability of Neapolitan Yellow Tuff.
Language
English
Obiettivo Specifico
2.3. TTC - Laboratori di chimica e fisica delle rocce
3.5. Geologia e storia dei sistemi vulcanici
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
/ 160 (2006)
Publisher
Elsevier
Pages (printed)
125-136
Issued date
2006
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.
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.
References
AGIP — Esplorazione Geotermica. Works published in 1972–1986.
Ascolese, E., Aurisicchio, A., Briggs-Smith, M., Mita, D.G., Perna, G.,
Rossi, S., Gaeta, F.S., 1993a. Thermodynamics of water-permeated
unwelded pyroclasts 1. Equilibrium properties. J. Volcanol. Geotherm.
Res. 57, 219–233.
Ascolese, E., Aurisicchio, A., Briggs-Smith, M., Mita, D.G., Perna, G.,
Rossi, S., Gaeta, F.S., 1993b. Thermodynamics of water-permeated
unwelded pyroclasts 2. Non-equilibrium properties. J. Volcanol.
Geotherm. Res. 57, 235–251.
Bear, J., Bachmat, Y., 1998. Introduction to Modeling of Transport
Phenomena in Porous Media. Kluwer Academic Press. pages 162,
174 and 175.
Deino, A.L., Orsi, G., de Vita, S., Piochi, M., 2004. The age of the
Neapolitan Yellow Tuff caldera-forming eruption (Campi Flegrei
caldera—Italy) assessed by 40Ar/39Ar dating method. J. Volcanol.
Geotherm. Res. 133, 157–170.
Fitts, D.D., 1962. In: Hume, David N. (Ed.), The Phenomenological
Relations in Nonequilibrium Thermodynamics. McGraw-Hill
Book Co. Inc, London, pp. 34–50.
Gaeta, F.S., Mita, D.G., 1979. Thermal diffusion across porous
partitions. The process of thermodialysis. J. Phys. Chem. 83,
2276–2284.
Gaeta, F.S., Ascolese, E., Bencivenga, U., Ortiz de Zarate, J.M.,
Pagliuca, N., Perna, G., Rossi, S., 1992. Theories and experiment
on non-isothermal matter transport in porous membranes. J. Phys.
Chem. 96, 6342–6350.
Gaeta, F.S., De Natale, G., Peluso, F.,Mastrolorenzo,G., Castagnolo,D.,
Troise, C., Pingue, F., Mita, D.G., Rossano, S., 1998. Genesis and
evolution of unrest episodes at Campi Flegrei caldera: the role of
thermal fluid-dynamical processes in the geothermal system.
J. Geophys. Res. 103, 921–933.
Gaeta, F.S., Peluso, F., Arienzo, I., Castagnolo, D., De Natale, G.,
Milano,G., Albanese, C.,Mita,D.G., 2003.A physical appraisal of a
new aspect on bradyseism: the mini-uplifts. J. Geophys. Res. —
Solid Earth 108-B8, 2363–2377.
Issel, A. 1883. Le oscillation lente del suolo o bradisimi, Atti R.
Universita Genova IV, 1-210.
Orsi, G., D'Antonio, M., de Vita, S., Gallo, G., 1992. The NeapolitanYellow
Tuff, a large magnitude trachytic phreatoplinian
eruption: eruptive dynamics, magma withdrawal and caldera
collapse. J. Volcanol. Geotherm. Res. 53, 275–287.
Orsi, G., De Vita, S., Di Vito, M., 1996. The restless resurgent
Campi Flegrei nested caldera (Italy): constraints on its
evolution and its configuration. J. Volcanol. Geotherm. Res.
74, 179–214.
Pagliuca, N., Bencivenga, U., Mita, D.G., Perna, G., Gaeta, F.S., 1983.
Isothermal and non-isothermal water transport in porous membranes.
I: the power balance. J. Membr. Sci. 14, 31–57.
Pagliuca, N., Bencivenga, U., Mita, D.G., Perna, G., Gaeta, F.S., 1987.
Isothermal and non-isothermal water transport in porous membranes.
II: the steady-state. J. Membr. Sci. 33, 1–25.
Peluso, F., Arienzo, I., 2002. Experimental determination of equilibrium
and non-equilibrium thermodynamic properties of natural
porous media. Entropie 239/240, 136–148.
Rosi, M., Sbrana, A. (Eds.), 1987. Phlegraean Fields. CNR, Quaderni
della Ricerca Scientifica n. 114, vol. 9, pp. 175–185.
Trubitsyn, V.P., Nikolaichik, V.V., Jacoby, W.R., 1993. A study of
hydrothermal convection in satured porous media. Tectonophysics
217, 73–89.
Ascolese, E., Aurisicchio, A., Briggs-Smith, M., Mita, D.G., Perna, G.,
Rossi, S., Gaeta, F.S., 1993a. Thermodynamics of water-permeated
unwelded pyroclasts 1. Equilibrium properties. J. Volcanol. Geotherm.
Res. 57, 219–233.
Ascolese, E., Aurisicchio, A., Briggs-Smith, M., Mita, D.G., Perna, G.,
Rossi, S., Gaeta, F.S., 1993b. Thermodynamics of water-permeated
unwelded pyroclasts 2. Non-equilibrium properties. J. Volcanol.
Geotherm. Res. 57, 235–251.
Bear, J., Bachmat, Y., 1998. Introduction to Modeling of Transport
Phenomena in Porous Media. Kluwer Academic Press. pages 162,
174 and 175.
Deino, A.L., Orsi, G., de Vita, S., Piochi, M., 2004. The age of the
Neapolitan Yellow Tuff caldera-forming eruption (Campi Flegrei
caldera—Italy) assessed by 40Ar/39Ar dating method. J. Volcanol.
Geotherm. Res. 133, 157–170.
Fitts, D.D., 1962. In: Hume, David N. (Ed.), The Phenomenological
Relations in Nonequilibrium Thermodynamics. McGraw-Hill
Book Co. Inc, London, pp. 34–50.
Gaeta, F.S., Mita, D.G., 1979. Thermal diffusion across porous
partitions. The process of thermodialysis. J. Phys. Chem. 83,
2276–2284.
Gaeta, F.S., Ascolese, E., Bencivenga, U., Ortiz de Zarate, J.M.,
Pagliuca, N., Perna, G., Rossi, S., 1992. Theories and experiment
on non-isothermal matter transport in porous membranes. J. Phys.
Chem. 96, 6342–6350.
Gaeta, F.S., De Natale, G., Peluso, F.,Mastrolorenzo,G., Castagnolo,D.,
Troise, C., Pingue, F., Mita, D.G., Rossano, S., 1998. Genesis and
evolution of unrest episodes at Campi Flegrei caldera: the role of
thermal fluid-dynamical processes in the geothermal system.
J. Geophys. Res. 103, 921–933.
Gaeta, F.S., Peluso, F., Arienzo, I., Castagnolo, D., De Natale, G.,
Milano,G., Albanese, C.,Mita,D.G., 2003.A physical appraisal of a
new aspect on bradyseism: the mini-uplifts. J. Geophys. Res. —
Solid Earth 108-B8, 2363–2377.
Issel, A. 1883. Le oscillation lente del suolo o bradisimi, Atti R.
Universita Genova IV, 1-210.
Orsi, G., D'Antonio, M., de Vita, S., Gallo, G., 1992. The NeapolitanYellow
Tuff, a large magnitude trachytic phreatoplinian
eruption: eruptive dynamics, magma withdrawal and caldera
collapse. J. Volcanol. Geotherm. Res. 53, 275–287.
Orsi, G., De Vita, S., Di Vito, M., 1996. The restless resurgent
Campi Flegrei nested caldera (Italy): constraints on its
evolution and its configuration. J. Volcanol. Geotherm. Res.
74, 179–214.
Pagliuca, N., Bencivenga, U., Mita, D.G., Perna, G., Gaeta, F.S., 1983.
Isothermal and non-isothermal water transport in porous membranes.
I: the power balance. J. Membr. Sci. 14, 31–57.
Pagliuca, N., Bencivenga, U., Mita, D.G., Perna, G., Gaeta, F.S., 1987.
Isothermal and non-isothermal water transport in porous membranes.
II: the steady-state. J. Membr. Sci. 33, 1–25.
Peluso, F., Arienzo, I., 2002. Experimental determination of equilibrium
and non-equilibrium thermodynamic properties of natural
porous media. Entropie 239/240, 136–148.
Rosi, M., Sbrana, A. (Eds.), 1987. Phlegraean Fields. CNR, Quaderni
della Ricerca Scientifica n. 114, vol. 9, pp. 175–185.
Trubitsyn, V.P., Nikolaichik, V.V., Jacoby, W.R., 1993. A study of
hydrothermal convection in satured porous media. Tectonophysics
217, 73–89.
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