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Scale dependence of in‐situ permeability measurements in the Nankai accretionary prism: The role of fractures
Author(s) -
Boutt David F.,
Saffer Demian,
Doan MaiLinh,
Lin Weiren,
Ito Takatoshi,
Kano Yasuyuki,
Flemings Peter,
McNeill Lisa C.,
Byrne Timothy,
Hayman Nicholas W.,
Moe Kyaw Thu
Publication year - 2012
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2012gl051216
Subject(s) - accretionary wedge , borehole , geology , permeability (electromagnetism) , subduction , tectonics , petrology , seismology , pore water pressure , submarine pipeline , fluid dynamics , mineralogy , geotechnical engineering , mechanics , genetics , physics , membrane , biology
Modeling studies suggest that fluid permeability is an important control on the maintenance and distribution of pore fluid pressures at subduction zones generated through tectonic loading. Yet, to date, few data are available to constrain permeability of these materials, at appropriate scales. During IODP Expedition 319, downhole measurements of permeability within the uppermost accretionary wedge offshore SW Japan were made using a dual‐packer device to isolate 1 m sections of borehole at a depth of 1500 m below sea floor. Analyses of pressure transients using numerical models suggest a range of in‐situ fluid permeabilities (5E‐15–9E‐17 m 2 ). These values are significantly higher than those measured on core samples (2E‐19 m 2 ). Borehole imagery and cores suggests the presence of multiple open fractures at this depth of measurement. These observations suggest that open permeable natural fractures at modest fracture densities could be important contributors to overall prism permeability structure at these scales.