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Permeability of rock samples from the Kola and KTB superdeep boreholes at high P-T parameters as related to the problem of underground disposal of radioactive waste

By
A. V. Zharikov
A. V. Zharikov
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences, Staromonetny per., 35, 119017, Moscow, Russiavil@igem.ru
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V. I. Malkovsky
V. I. Malkovsky
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences, Staromonetny per., 35, 119017, Moscow, Russiavil@igem.ru
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V. M. Shmonov
V. M. Shmonov
Institute of Experimental Mineralogy of the Russian Academy of Sciences, 142432, Chernogolovka Moscow district, Russia
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V. M. Vitovtova
V. M. Vitovtova
Institute of Experimental Mineralogy of the Russian Academy of Sciences, 142432, Chernogolovka Moscow district, Russia
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Published:
January 01, 2005

Abstract

An experimental study of the samples collected from a depth of 3.8–11.4 km in the Kola and KTB superdeep boreholes, and from the Earth's surface at the Kola drilling site was carried out at temperatures up to 600°C and pressures up to 150 MPa. The study was focused on the estimation of in situ permeability of the deep-seated rocks, their palaeopermeability during metamorphic transformations, and their protective properties for HLW disposal. Permeability dependencies on pressure and temperature were obtained. An increase in confining pressure leads to a decrease in rock sample permeability. The temperature trends obtained are of different types: permeability may decrease within the entire temperature range, or it may firstly decrease, reach its minimum and then decrease. It was found that this permeability behaviour is due to rock microstructure transformations caused by the competing effects of temperature and effective pressure. A possible in situ permeability trend for the superdeep section was proposed. A numerical simulation of convective transport was performed in order to determine a safe depth for the HLW well repository. The estimates obtained show that HLW well repositories can be used safely at relatively shallow depths.

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Contents

Geological Society, London, Special Publications

Petrophysical Properties of Crystalline Rocks

P. K. Harvey
P. K. Harvey
University of Leicester, UK
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T. S. Brewer
T. S. Brewer
University of Leicester, UK
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P. A. Pezard
P. A. Pezard
Université de Montpellier II, France
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V. A. Petrov
V. A. Petrov
IGEM, Russian Academy of Sciences, Russia
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Geological Society of London
Volume
240
ISBN electronic:
9781862394889
Publication date:
January 01, 2005

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