• Chapter contents
• Abstract
• Introduction
• Methods and materials
• Sampling and sample handling
• Constant-flow apparatus
• Backpressure saturation
• Constant-flow tests
• Data reduction
• Imaging microfabric
• Energy dispersive X-ray spectroscopy
• Results
• Textural and compositional characterization
• Microfabric statistics
• Permeability
• Acknowledgments
• References
• Figures
• F1. NanTroSEIZE site locations.
• F2. Lithology, stratigraphy, and bedding dips.
• F3. X-ray CT and core images.
• F4. Constant-flow permeability test.
• F5. Flow-through testing response.
• F6. Geometric relations of bedding and orientation.
• F7. ESEM images of specimens tested for permeability.
• F8. ESEM image and major element spectrum.
• F9. Grain size differences.
• F10. Pyrite framboid.
• F11. ESEM images of different grain sizes.
• F12. Uniform grain size distribution.
• F13. Orientation of grains.
• F14. Cumulative frequency curves of grain orientations.
• F15. Index of orientation.
• F16. Vertical intrinsic permeability.
• F17. Relation between intrinsic permeability and post-test porosity.
• Tables
• T1. Specimen properties before and after permeability tests.
• T2. Statistics of preferred orientation of microfabric.
• T3. Average values of permeability and hydraulic conductivity.
• T4. Flow-through permeability test results.
• Appendix
• Appendix figures
• AF1. Hydraulic gradient versus discharge velocity, Sample 3R-1, 51 cm.
• AF2. Hydraulic gradient versus discharge velocity, Sample 4R-2, 98 cm.
• AF3. Hydraulic gradient versus discharge velocity, Sample 6R-1, 64 cm.
• AF4. ESEM images of specimens, Sample 3R-1, 51 cm.
• AF5. Documentation of microfossils.
• AF6. ESEM images of specimens, Sample 4R-2, 98 cm.
• AF7. Documentation of pyrite.
• AF8. ESEM images of specimens, Sample 6R-1, 64 cm.
• AF9. Documentation of barite.
• PDF file

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doi:10.2204/iodp.proc.348.201.2017

Data report: permeability and microfabric of core samples from IODP Expedition 348, Hole C0002P, Nankai Trough accretionary prism¹

Chen Song² and Michael B. Underwood³

Abstract

This report documents the results of constant-flow permeability tests in the vertical (along core) direction administered at effective isotropic confining stresses of 0.28 MPa (40 psi) and 0.55 MPa (80 psi). Specimens from the Nankai accretionary prism were collected from Hole C0002P of the Integrated Ocean Drilling Program. Beds dip at steep angles (typically 80° or more) throughout the cored interval (2174.98–2209.64 meters below seafloor). We tested specimens that consist of indurated clayey siltstone and medium to coarse siltstone. Environmental scanning electron microscopy shows that grain fabric is random and does not vary significantly among the specimens tested. Hydraulic conductivity values range from 3.83 × 10^–9 to 2.68 × 10^–8 cm/s. Intrinsic permeability values range from 3.80 × 10^–18 to 2.66 × 10^–17 m².

¹ Song, C., and Underwood, M.B., 2017. Data report: permeability and microfabric of core samples from IODP Expedition 348, Hole C0002P, Nankai Trough accretionary prism. In Tobin, H., Hirose, T., Saffer, D., Toczko, S., Maeda, L., Kubo, Y., and the Expedition 348 Scientists, Proceedings of the Integrated Ocean Drilling Program, 348: College Station, TX (Integrated Ocean Drilling Program).
doi:10.2204/iodp.proc.348.201.2017

² Department of Geological Sciences, University of Missouri, Columbia MO 65211, USA.

³ Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro NM 87801, USA.
UnderwoodM@missouri.edu

Initial receipt: 23 February 2016
Acceptance: 1 May 2017
Publication: 7 July 2017
MS 348-201

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