Proc. IODP, 322, Data report: permeability and microfabric of mud(stone) samples from IODP Sites C0011 and C0012, NanTroSEIZE subduction inputs

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Chapter contents Abstract Introduction Methods and materials Sampling and sample handling Imaging microfabric Results Acknowledgments References Figures F1. Location map. F2. Stratigraphic columns and lithologic units. F3. Constant-flow permeability testing system. F4. Transient head difference. F5. Bedding, core axis orientation, and horizontal and vertical sections used for imaging. F6. Permeability test specimens. F7. Intrinsic permeability. F8. Intrinsic permeability and post-test porosity. F9. Orientation of grains. F10. Cumulative frequency curves. F11. Trends in the index of orientation anisotropy of permeability. Tables T1. Specimen properties. T2. Flow-through permeability. T3. Mudstone microfabric. T4. permeability and hydraulic conductivity. Appendix Appendix figures AF1. Hydraulic gradient versus discharge velocity. AF2. Hydraulic gradient versus discharge velocity. AF3. Hydraulic gradient versus discharge velocity. AF4. Hydraulic gradient versus discharge velocity. AF5. Hydraulic gradient versus discharge velocity. PDF file			Previous \| Next doi:10.2204/iodp.proc.322.211.2015 Data report: permeability and microfabric of mud(stone) samples from IODP Sites C0011 and C0012, NanTroSEIZE subduction inputs¹ Chen Song,² Mehmet Koray Ekinci,² Michael B. Underwood,² and Pierre Henry³ Abstract This report documents the results of constant-flow permeability tests in the horizontal (cross-core) and vertical (along-core) directions, administered at an effective isotropic confining stress of 0.55 MPa (80 psi). The whole-round specimens of mud(stone) were collected from depths of ~34 to 748 meters below seafloor at Integrated Ocean Drilling Program Sites C0011 and C0012 in the Shikoku Basin. Unfortunately, only ten samples were tested successfully; five samples failed because of drilling-induced core damage or friability. Most test results show minor anisotropy effects, with horizontal permeability greater than vertical. At Site C0011, the range of hydraulic conductivity (K) is 1.76 × 10^–8 to 3.70 × 10^–10 cm/s. Intrinsic permeability (k) ranges from 1.75 × 10^–17 to 3.67 × 10^–19 m², and the average ratio of horizontal to vertical permeability (k_h/k_v) is 1.26. At Site C0012, values of K range from 3.80 × 10^–8 to 1.69 × 10^–9 cm/s. Intrinsic permeability ranges from 3.77 × 10^–17 to 1.68 × 10^–18, and the average ratio of k_h/k_v is 1.58. Environmental scanning electron microscopy shows that grain fabric is random and does not vary significantly among the specimens tested. Moreover, the correlation of microfabric statistics with k_h/k_v values is not statistically significant. ¹ Song, C., Ekinci, M.K., Underwood, M.B., and Henry, P., 2015. Data report: permeability and microfabric of mud(stone) samples from IODP Sites C0011 and C0012, NanTroSEIZE subduction inputs. In Saito, S., Underwood, M.B., Kubo, Y., and the Expedition 322 Scientists, Proc. IODP, 322: Tokyo (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/iodp.proc.322.211.2015 ² Department of Geological Sciences, University of Missouri, Columbia MO 65211, USA. Correspondence author: UnderwoodM@missouri.edu ³ Centre Européen de Recherche et d’Enseignement des Géosciences de l’Environement, Aix-Marseille University, Europole de l’Arbois, 13545 Aix en Provence, France. Initial receipt: 11 November 2013 Acceptance: 4 February 2015 Publication: 6 April 2015 MS 322-211 Top of page \| Previous \| Next