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The final results of this interdisciplinary study on gas migration and behaviour under real geological conditions are presented. The overall study has been aimed at refining the soil gas method for the assessment of sites for radioactive waste repositories, where gas release into the far field could be a potential environmental hazard. Soil gas surveys, based on the collection of about 2000 samples (analysed mainly for helium, radon and CO(2)), and two field gas injection tests (helium and CO(2)), provided specific information on the gas bearing properties of Neogene clay deposits in Italy and Paleogene clays in the United Kingdom, at regional and local scales. These studies were supported by geophysical, photogeological and geotechnical investigations. Soil gas studies showed the occurrence of leakages of naturally migrating gases through tectonic discontinuities bordering or crossing the clay basins, even where clayey deposits were hundreds of metres thick. The gas injection tests showed that gas can migrate rapidly upwards, crossing local aquifers and following narrow channels of enhanced permeability linked to existing faults.

Additional information

Authors: LOMBARDI S ET AL, Università di Roma (IT);GRAINGER P ET AL, University of Exeter (GB);GERA F ET AL, ISMES SpA, Bergamo (IT);GRINDROD P ET AL, QuantiSci Limited, Henley-on-Thames (GB)
Bibliographic Reference: EUR 16929 EN (1996) 193pp., FS, ECU 20.00
Availability: Available from the (2)
ISBN: ISBN 92-827-7838-X
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