Full permeability and porosity profile across the Kumano Basin

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Author(s): Doan, Mai-Linh
Author Affiliation(s): Primary:
Université Joseph Fourier, Laboratoire de Géophysique Interne et Tectonophysique, Grenoble, France
Volume Title: European Geosciences Union general assembly 2013
Source: Geophysical Research Abstracts, Vol.15; European Geosciences Union general assembly 2013, Vienna, Austria, April 7-12, 2013. Publisher: Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau, Germany. ISSN: 1029-7006
Note: In English
Summary: During the Integrated Oceanic Drilling Program (IODP) expedition 319, part of the NantroSEIZE project, the C0009 borehole has been drilled within the Kumano Basin, a forearc basin related to the To-Nankai subduction trench offshore the Kii peninsula. This was the first IODP borehole drilled with the riser technology, which enables the use of drilling mud. Because of its higher density, mud was overpressurized relative to the in-situ fluid pressure. By quantifying this process, we could quantify the hydraulic parameters along the borehole. The HRLA (High Resolution Laterolog Array) simultaneously records apparent resistivity for different depths of penetration. By inverting the HRLA data, we could compute the invasion diameter along the borehole, which is afterwards converted into permeabilities. Permeability correlates with the results with point-wise hydraulic tests performed with the Modular Testing Tool (MDT) and enables their extrapolation to the full borehole. Permeability is strongly controlled by lithology. It decreases with depth, even when reaching the accretionary prism. This surprising result can be explained by the porosity logs. We could get both the full profile of macroporosity, determined from both sonic log, and the full profile of total porosity, determined from density log. Their comparison documents the clay content of the formation. The accretionary prism has larger fracture density, but also higher clay content. [Copyright Author(s) 2013. CC Attribution 3.0 License: https://creativecommons.org/licenses/by/3.0/legalcode]
Year of Publication: 2013
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 06 Petrology, Sedimentary; Asia; Expedition 319; Far East; Honshu; IODP Site C0009; Integrated Ocean Drilling Program; Japan; Kii Peninsula; Kumano Basin; NanTroSEIZE; North Pacific; Northwest Pacific; Pacific Ocean; West Pacific
Coordinates: N332728 N332728 E1363209 E1363209
Record ID: 2018064139
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from European Geosciences Union, Munich, Germany