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Université de Provence - Aix-Marseille I Hyper Articles en Ligne |
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Université de Provence - Aix-Marseille I Hyper Articles en Ligne |
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| HAL : insu-00652095, version 1 |
| DOI : 10.1029/2010GC003284 |
| Fiche détaillée |  Récupérer au format |
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| Geochemistry, Geophysics, Geosystems 12 (2011) Q0AD06 |
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| Quantification of free gas in the Kumano fore‐arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009 |
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Mai-Linh Doan 1Marianne Conin 2 |
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| IODP France; ECORD; INSU Collaboration(s) |
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| (28/01/2011) |
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| The Kumano fore-arc basin overlies the Nankai accretionary prism, formed by the subduction of the Philippine Sea Plate beneath the Eurasian plate offshore the Kii Peninsula, SW Honshu, Japan. Seismic surveys and boreholes within the framework of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) project show evidence of gas hydrates and free gas within the basin. Here we use high-quality borehole sonic data from Integrated Oceanic Drilling Program (IODP) Site C0009 to quantify the free gas distribution in the landward part of the basin. The Brie theory is used to quantify gas content from sonic logs, which are calibrated from laboratory measurements on drill cores. First, we show that the sonic data are mainly sensitive to the fluid phase filling the intergranular pores (effective porosity), rather than to the total porosity that includes water bound to clay minerals. We then compare the effective porosity to lithodensity-derived porosity that acts as a proxy for total porosity. The combination of these two data sets also allows assessment of clay mineralogy of the sediments. Second, we compute free gas saturation and find a gas-rich interval that is restricted to a lithological unit characterized by a high abundance of wood fragments and lignite. This unit, at the base of the fore-arc basin, is a hydrocarbon source that should be taken into account in models explaining gas distribution and the formation of the bottom-simulating reflector within the Kumano fore-arc basin. |
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| 1 : | Institut des sciences de la Terre (ISTerre) |
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CNRS : UMR5275 – IFSTTAR – Université de Savoie – Université Joseph Fourier - Grenoble I – INSU – OSUG – Institut de recherche pour le développement [IRD] : UR219 |
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| 2 : | Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) |
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CNRS : UMR6635 – Institut de recherche pour le développement [IRD] – INSU – Université de Provence - Aix-Marseille I – Université Paul Cézanne - Aix-Marseille III |
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| 3 : | GFZ German Research Center for Geosciences |
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Helmholtz-Centre Potsdam |
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| 4 : | Department of Geosciences |
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University of Massachusetts Amherst |
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| 5 : | Research School of Earth Sciences |
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The Australian National University |
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| 6 : | Geosciences |
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Pennsylvania State University |
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| 7 : | National Oceanography Centre |
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Univesity of Southampton |
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| 8 : | Department of Energy Resources Engineering |
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Pukyong National University |
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| 9 : | Kochi Institute for Core Sample Research |
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Kochi Institute for Core Sample Research |
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| Mécanique des failles |
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| domaine | : | Planète et Univers/Sciences de la Terre/Géophysique Physique/Physique/Géophysique Sciences de l'environnement/Milieux et Changements globaux Planète et Univers/Sciences de la Terre/Stratigraphie |
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| gas saturation – sonic data – porosity – clay mineralogy – Kumano fore‐arc basin – NanTroSEIZE. |
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| insu-00652095, version 1 | |
| http://hal-insu.archives-ouvertes.fr/insu-00652095 | |
| oai:hal-insu.archives-ouvertes.fr:insu-00652095 | |
| Contributeur : Mai Linh Doan | |
| Soumis le : Mercredi 14 Décembre 2011, 18:56:43 | |
| Dernière modification le : Lundi 26 Mars 2012, 15:00:19 | |
