Publication Date:
2017-04-03
Description:
Molecular composition, CH4 isotopes and gas flux of all main terrestrial mud volcanoes and other methane seeps in
Italy are being assessed for the first time. Whereas 74% of the Italian gas reservoirs are biogenic, about 80% of the seeps release thermogenic gas. Dry-seep gas generally maintains the reservoir C1/(C2 + C3) ‘‘Bernard’’ ratio while mud volcanoes show molecular fractionation likely occurring during advective migration. Accordingly, a simple and direct use of the ‘‘Bernard’’ parameter might be misleading when applied to mud volcanoes as it could not always reflect the reservoir composition. Methane flux into the atmosphere from macro-seep areas is in the order of 102–106 t km-2y-1.
Microseepage is widespread throughout large areas and, on a regional scale, it provides the main methane output.
A first emission estimate for the total hydrocarbon-prone area of Italy suggests levels of 105 t y-1, comparable to national sources fromfossil fuel industry
Description:
Published
Description:
L14303
Description:
4.5. Degassamento naturale
Description:
JCR Journal
Description:
reserved
Keywords:
Methane
;
Seeps
;
mud volcanoes
;
03. Hydrosphere::03.04. Chemical and biological::03.04.05. Gases
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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