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doi:10.2204/iodp.proc.314315316.204.2012 Data report: permeability of mud(stone) samples from Site C0001, IODP Expedition 315, Nankai Trough: NanTroSEIZE Stage 11Lei Yue,2 William J. Likos,2, 3 Junhua Guo,4 and Michael B. Underwood4AbstractIn this study, we conducted constant-flow permeability tests in the horizontal (cross-core) and vertical (along-core) directions using five whole-round core specimens of mud(stone) from Integrated Ocean Drilling Program (IODP) Site C0001. The site is located above the accretionary prism of the Nankai Trough offshore of the Kii Peninsula, Japan. The samples came from depths of approximately 25 to 290 m below seafloor and include lithologic Units I (slope apron facies) and II (upper accretionary prism). Effective isotropic confining stress during the tests was set at five increments ranging from 0.034 MPa (5 psi) to 0.551 MPa (80 psi). Average values of hydraulic conductivity range from 1.06 × 10–8 to 7.30 × 10–7 cm/s. Corresponding values of intrinsic permeability range from ~10–17 to 10–16 m2. The ratio of horizontal to vertical permeability (kh/kv) averages 1.15. Environmental scanning electron microscopy was used to assess the relation between the sediment’s microstructure and the anisotropy of permeability. Indicators of anisotropy generally show modestly better alignment of grains in the horizontal direction. |
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