Understanding shallow gas occurrences in the Gulf of Lions (Articolo in rivista)

Type
Label
  • Understanding shallow gas occurrences in the Gulf of Lions (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Garcia-Garcia A. (1) (2), Tesi T. (2), Orange D. (1) (4), Lorenson T. (5), Miserocchi S. (3), Langone L . (3), Herbert I. (2), Dougherty J. (5) (2007)
    Understanding shallow gas occurrences in the Gulf of Lions
    in Geo-marine letters
    (literal)
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  • Garcia-Garcia A. (1) (2), Tesi T. (2), Orange D. (1) (4), Lorenson T. (5), Miserocchi S. (3), Langone L . (3), Herbert I. (2), Dougherty J. (5) (literal)
Pagina inizio
  • 143 (literal)
Pagina fine
  • 154 (literal)
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  • 27 (literal)
Rivista
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  • Journal Geo-Marine Letters Publisher Springer Berlin / Heidelberg ISSN 0276-0460 (Print) 1432-1157 (Online) Issue Volume 27, Numbers 2-4 / June, 2007 Category Original DOI 10.1007/s00367-007-0067-1 Pages 143-154 Subject Collection Earth and Environmental Science SpringerLink Date Saturday, May 05, 2007 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • (1) Department of Earth and Planetary Sciences, UCSC, Santa Cruz, CA 95064, USA (2) Geomarine Sciences, AOA Geophysics Inc., Moss Landing, CA 95039, USA (3) CNR-ISMAR, 40129 Bologna, Italy (4) Black Gold Energy, Kemang, Jakarta, 12730, Indonesia (5) USGS, Menlo Park, CA 94025, USA (literal)
Titolo
  • Understanding shallow gas occurrences in the Gulf of Lions (literal)
Abstract
  • New coring data have been acquired along the western Gulf of Lions showing anomalous concentrations of methane (up to 95,700 ppm) off the Rhone prodelta and the head of the southern canyons Lacaze-Duthiers and Cap de Creus. Sediment cores were acquired with box and kasten cores during 2004-2005 on several EuroSTRATAFORM cruises. Anomalous methane concentrations are discussed and integrated with organic carbon data. Sampled sites include locations where previous surveys identified acoustic anomalies in high-resolution seismic profiles, which may be related to the presence of gas. Interpretation of the collected data has enabled us to discuss the nature of shallow gas along the Gulf of Lions, and its association with recent sedimentary dynamics. The Rhone prodelta flood deposits deliver significant amounts of terrigenous organic matter that can be rapidly buried, effectively removing this organic matter from aerobic oxidation and biological uptake, and leading to the potential for methanogenesis with burial. Away from the flood-related sediments off the Rhone delta, the organic matter is being reworked and remineralized on its way along the western coast of the Gulf of Lions, with the result that the recent deposits in the canyon contain little reactive carbon. In the southernmost canyons, Lacaze-Duthiers and Cap de Creus, the gas analyses show relatively little shallow gas in the core samples. Samples with anomalous gas (up to 5,000 ppm methane) are limited to local areas where the samples also show higher amounts of organic matter. The anomalous samples at the head of the southern canyons may be related to methanogenesis of recent drape or of older sidewall canyon infills. (literal)
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