| IODP Proceedings Volume contents Search | |||
 | |||
| Expedition reports Research results Supplementary material Drilling maps Expedition bibliography | |||
|
doi:10.2204/iodp.proc.314315316.214.2011 Data report: permeability of mud(stone) samples from IODP Sites C0006 and C0007, Nankai Trough Seismogenic Zone Experiment1Mehmet Koray Ekinci,2 William J. Likos,3 Michael B. Underwood,2 and Junhua Guo2AbstractIn this study, we executed constant-flow permeability tests in the horizontal (cross-core) and vertical (along-core) directions using 11 whole-round core specimens of mud(stone) from Integrated Ocean Drilling Program Nankai Trough Sites C0006 and C0007. The samples came from ~34 to 564 meters below seafloor and include lithostratigraphic Units II (accreted trench wedge) and III (upper Shikoku Basin facies). Effective isotropic confining stress during the tests was set at 0.55 MPa (80 psi). At Site C0006, the highest value of vertical hydraulic conductivity (Kv) is 1.60 × 10–6 cm/s and the lowest value of vertical hydraulic conductivity is 2.63 × 10–10 cm/s. The highest value of horizontal hydraulic conductivity (Kh) is 2.07 × 10–6 cm/s, and the lowest value of horizontal hydraulic conductivity is 3.25 × 10–10 cm/s. The average ratio of horizontal to vertical intrinsic permeability (kh/kv) is 4.27. At Site C0007, the highest value of vertical hydraulic conductivity is 1.24 × 10–9 cm/s and the lowest value of vertical hydraulic conductivity is 9.54 × 10–10 cm/s. Horizontal hydraulic conductivity reaches a maximum of 1.15 × 10–9 cm/s, and the lowest value of horizontal hydraulic conductivity is 8.09 × 10–10 cm/s. The average ratio kh/kv is 0.93 for specimens at Site C0007. Environmental scanning electron microscopy was used to evaluate the relation between sediment microstructure and anisotropy of permeability. The index of orientation does not vary significantly and shows a weak correlation with kh/kv values. |
|||
