Sediment Permeability at the Nankai Accretionary Prism, Site 808

Taylor, Elliott; Fisher, A. T.

doi:10.2973/odp.proc.sr.131.131.1993

Cited by 11 publications

(14 citation statements)

References 34 publications

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“…However, they differ from direct measurements of permeability in sediments of the Nankai complex [e.g., Taylor and Fisher, 1993] (Figure 6). This suggests that either the source terms are underestimated or the direct measurements do not reflect bulk permeability.…”

Section: Sensitivity Analysis Of Permeabilities and Steady State Presmentioning

confidence: 98%

Episodic fluid flow in the Nankai accretionary complex: Timescale, geochemistry, flow rates, and fluid budget

Saffer

Bekins²

1998

J. Geophys. Res.

159

229

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Section: Sensitivity Analysis Of Permeabilities and Steady State Presmentioning

confidence: 98%

Episodic fluid flow in the Nankai accretionary complex: Timescale, geochemistry, flow rates, and fluid budget

Saffer

Bekins²

1998

J. Geophys. Res.

159

229

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“…Similarly, measurements of permeability on core samples from accretionary prism sediments show decreasing permeability as effective stress increases (as the sample is consolidated). For some samples, the log of permeability varies approximately linearly with void ratio, which is proportional to porosity [Brown, 1995;Taylor and Fisher, 1993]. However, Brown [1995] The evolving image of fluid flow in accretionary prisms indicates a complex interrelated system of deformation, elevated pore pressures, permeability enhancement, and fluid migration.…”

Section: Laboratory Permeability Measurementsmentioning

confidence: 99%

Fluid flow in accretionary prisms: Evidence for focused, time‐variable discharge

Carson¹,

Screaton²

1998

Reviews of Geophysics

102

100

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Abstract. Accretionary prisms are wedges of saturated sediment that are subject to intense deformation as a result of lithosphere convergence. Compressive stress and rapid burial of the accreted deposits result in sediment compaction and mineral dehydration. These latter processes, in conjunction with fermentation or thermal maturation of entrained organic matter, yield hydrocarbon-bearing pore fluids that are expelled from the prism.

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“…The fluid flow is controlled by the hydraulic diffusivity of the rock, a function of both permeability and specific storage. Permeability measurements on samples from the Nankai accretionary complex have been previously performed without pressure confinement (Taylor and Fisher, 1993) or at low confining pressure (<1 MPa) (Gamage and Screaton, 2003;Karig, 1993 …”

Section: Introductionmentioning

confidence: 99%

Data report: permeability measurements under confining pressure, Expeditions 315 and 316, Nankai Trough

Reuschlé¹

2011

Proceedings of the IODP

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Permeability of six samples from Integrated Ocean Drilling Program (IODP) Sites C0001 and C0006 was measured in a triaxial cell under effective hydrostatic confining pressure from 1 to 30 MPa. Sample depths range from 225 to 448 meters below seafloor (mbsf) for Site C0001 and from 201 to 564 mbsf for Site C0006. Our results indicate that the initial permeability at 1 MPa of effective confining pressure ranges from 4.6 × 10 -18 to 1.8 × 10 -19 m 2 depending on depth. Permeability decreases with increasing depth, which also corresponds to a decrease of porosity from 62% to 43%. The permeability versus depth trend is similar for both sites. When the effective confining pressure is increased from 1 to 30 MPa, the permeability decreases for all samples. However, this trend shows some variability, indicating a finer microstructural control depending on the lithologic origin of the sample. IntroductionWhen analyzing deformation processes in accretionary complexes like Nankai, one has to take into account several timescales. One important timescale is a result of the competition between two kinetics, one related to the eventual pore pressure build-up linked to pore fluid trapping during tectonic loading of the subduction zone and the other related to the ability of the pore fluid to flow out of the system, thus leading to pore pressure dissipation and avoiding any effective confining stress decrease that would enhance unstable slip of the system. The fluid flow is controlled by the hydraulic diffusivity of the rock, a function of both permeability and specific storage. Permeability measurements on samples from the Nankai accretionary complex have been previously performed without pressure confinement (Taylor and Fisher, 1993) or at low confining pressure (<1 MPa) (Gamage and Screaton, 2003;Karig, 1993

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Sediment Permeability at the Nankai Accretionary Prism, Site 808

Cited by 11 publications

References 34 publications

Episodic fluid flow in the Nankai accretionary complex: Timescale, geochemistry, flow rates, and fluid budget

Episodic fluid flow in the Nankai accretionary complex: Timescale, geochemistry, flow rates, and fluid budget

Fluid flow in accretionary prisms: Evidence for focused, time‐variable discharge

Data report: permeability measurements under confining pressure, Expeditions 315 and 316, Nankai Trough

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