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Scale dependence of in-situ permeability measurements in the Nankai accretionary prism: The role of fractures

Scale dependence of in-situ permeability measurements in the Nankai accretionary prism: The role of fractures
Scale dependence of in-situ permeability measurements in the Nankai accretionary prism: The role of fractures
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 m2). These values are significantly higher than those measured on core samples (2E-19 m2). 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.
0094-8276
L07302
Boutt, David F.
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Saffer, Demian
6fd2b25f-3d8f-45cd-b063-2255867b94cd
Doan, Mai-Linh
c3133590-40bd-4b12-9282-4acd49ae9a2a
Lin, Weiren
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Ito, Takatoshi
4abdf456-2b40-460d-988f-75aa477fb402
Kano, Yasuyuki
293471ef-aab5-4762-b161-967bf814e045
Flemings, Peter
ef92ea7b-beb5-4e2b-a0ff-c4167725d4ec
McNeill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Byrne, Timothy
480c2170-28e2-45b8-aaac-a1563e39d9ef
Hayman, Nicholas W.
11ecd365-e773-45ea-b8e3-75562edba8fa
Moe, Kyaw Thu
fd4d0789-052b-4434-9356-dd05d9a57052
Boutt, David F.
9f26b2f6-4583-4c5a-be45-a5c22bbeb059
Saffer, Demian
6fd2b25f-3d8f-45cd-b063-2255867b94cd
Doan, Mai-Linh
c3133590-40bd-4b12-9282-4acd49ae9a2a
Lin, Weiren
40c7a3c2-97b0-4f29-93a3-054040296528
Ito, Takatoshi
4abdf456-2b40-460d-988f-75aa477fb402
Kano, Yasuyuki
293471ef-aab5-4762-b161-967bf814e045
Flemings, Peter
ef92ea7b-beb5-4e2b-a0ff-c4167725d4ec
McNeill, Lisa C.
1fe6a1e0-ca1a-4b6f-8469-309d0f9de0cf
Byrne, Timothy
480c2170-28e2-45b8-aaac-a1563e39d9ef
Hayman, Nicholas W.
11ecd365-e773-45ea-b8e3-75562edba8fa
Moe, Kyaw Thu
fd4d0789-052b-4434-9356-dd05d9a57052

Boutt, David F., Saffer, Demian, Doan, Mai-Linh, Lin, Weiren, Ito, Takatoshi, Kano, Yasuyuki, Flemings, Peter, McNeill, Lisa C., Byrne, Timothy, Hayman, Nicholas W. and Moe, Kyaw Thu (2012) Scale dependence of in-situ permeability measurements in the Nankai accretionary prism: The role of fractures. Geophysical Research Letters, 39 (7), L07302. (doi:10.1029/2012GL051216).

Record type: Article

Abstract

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 m2). These values are significantly higher than those measured on core samples (2E-19 m2). 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.

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Published date: 2012
Organisations: Geology & Geophysics

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Local EPrints ID: 338019
URI: https://eprints.soton.ac.uk/id/eprint/338019
ISSN: 0094-8276
PURE UUID: 88f15185-4edc-4f2f-a079-93a459eb5340

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Date deposited: 08 May 2012 12:47
Last modified: 18 Jul 2017 05:59

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Contributors

Author: David F. Boutt
Author: Demian Saffer
Author: Mai-Linh Doan
Author: Weiren Lin
Author: Takatoshi Ito
Author: Yasuyuki Kano
Author: Peter Flemings
Author: Lisa C. McNeill
Author: Timothy Byrne
Author: Nicholas W. Hayman
Author: Kyaw Thu Moe

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