Seafloor depressions on the Nigerian margin: Seabed morphology and sub-seabed hydrate distribution
| Autor: | F. Taleb, Nabil Sultan, Tania Marsset, M. Lemaire, Sebastien Garziglia |
|---|---|
| Přispěvatelé: | Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 (PhLAM), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires (ISM), Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1 (UB)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Stratigraphy Pockmark Clathrate hydrate Petrophysics Sediment Geology 010502 geochemistry & geophysics Oceanography 01 natural sciences Seafloor spreading Geophysics Volume (thermodynamics) [SDU]Sciences of the Universe [physics] Economic Geology Bathymetry Petrology Seabed 0105 earth and related environmental sciences |
| Zdroj: | Marine and Petroleum Geology Marine and Petroleum Geology, Elsevier, 2020, 114, pp.104175-. ⟨10.1016/j.marpetgeo.2019.104175⟩ Marine and Petroleum Geology, 2020, 114, pp.104175-. ⟨10.1016/j.marpetgeo.2019.104175⟩ |
| ISSN: | 0264-8172 |
| DOI: | 10.1016/j.marpetgeo.2019.104175⟩ |
| Popis: | Gas hydrate quantification using acoustic data requires proper knowledge of the mineralogy of their host sediment. In this paper, a petrophysical model allowing GH quantification at sites where mineralogy profiles are absent is proposed. This approach is applied to a high gas flux pockmark system in the Gulf of Guinea where in-situ acoustic and geotechnical measurements together with core measurements could have been correlated and tied to seismic data. Projections of the in-situ measurements on seismic profiles have shown that the study area not only accommodates zones of shallow and dense GH; but also zones where solid hydrate and free gas coexist as well as pockets of free gas. Further analysis of several seismic profiles has allowed illustrating the detailed GH occurrence zone within the study area, estimate its volume and its occupancy ratio of the pockmark. Correlations between GH content and 3D bathymetry sections have allowed to draw a link between different GH contents and the morphology of the pockmark, which also shares similarities with the morphology of the GH occurrence zone it accommodates. |
| Databáze: | OpenAIRE |
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