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La géomorphologie des fonds marins et la présence d’hydrates de gaz contrôlent les émissions de gaz dans la Mer Noire au large de la Roumanie ArchiMer
Riboulot, Vincent; Cattaneo, Antonio; Scalabrin, Carla; Gaillot, Arnaud; Jouet, Gwenael; Ballas, Gregory; Marsset, Tania; Garziglia, Sebastien; Ker, Stephan.
The Romanian sector of the Black Sea deserves attention because the Danube deep-sea fan is one of the largest sediment depositional systems worldwide and is considered the world's most isolated sea, the largest anoxic water body on the planet and a unique energy-rich sea. Due to the high sediment accumulation rate, presence of organic matter and anoxic conditions, the Black sea sediments offshore the Danube delta is rich in gas and thus shows Bottom Simulating Reflectors (BSR). The cartography of the BSR over the last 20 years, exhibits its widespread occurrence, indicative of extensive development of hydrate accumulations and a huge gas hydrate potential. By combining old and new datasets acquired in 2015 during the GHASS expedition, we performed a...
Tipo: Text Palavras-chave: Hydrates de gaz; Gaz libre; Panaches de gaz; BSR; Mer Noire; Géomorphologie; Gas hydrates; Free gas; Gas flares; BSR; Black Sea; Geomorphology.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00407/51860/53914.pdf
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Caractérisation des systèmes gaz/hydrates de gaz de la Mer Noire par imagerie sismique haute résolution remorquée en fond de mer (SYSIF) ArchiMer
Colin, Florent.
The study of marine gas hydrates in great water depths using seismic data is limited by the resolution of current acquisition systems. The acquisition of very highresolution multichannel deep-towed seismic data aims to break this limitation. Deep-towed seismic system can provide seismic data with metric vertical resolution when the proper processing sequence is employed. However, the processing of deep-towed multichannel data is challenging as the source and receivers are constantly moving with respect to each other. In the first part of this PhD project, we developed processing methods tailored to the acquisition system SYstème SIsmique de Fond (SYSIF), developed by Ifremer. The processing sequence allows vertical and lateral resolutions up to 0.65 m and...
Tipo: Text Palavras-chave: Traitement sismique; Très haute résolution; Sismique grand fond; Hydrates de gaz; Gaz libre; Mer Noire; Seismic processing; Very high resolution; Deep-tow; Gas hydrates; Free gas; Black Sea.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00680/79246/81763.pdf
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