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Data report: permeability of ~1.9 km deep coal-bearing formation samples off the Shimokita Peninsula, Japan 1

Akira Ijiri, 2,3 Yojiro Ikegawa, 4 and Fumio Inagaki 2, 3, 5


We report the permeability of ~1.9 km deep coal-bearing formation samples retrieved at Site C0020 during Integrated Ocean Drilling Program Expedition 337 off the Shimokita Peninsula, Japan. The flow-through permeability test was conducted by a triaxial consolidation permeability test device. The intrinsic permeability of lignite coal samples is 3.80 × 10–20 m2 and 3.61 × 10–20 m2 at 1919.57 and 1922.95 meters below seafloor (mbsf), respectively. In contrast, a sample from a sand layer interbedded with the coal layer at 1925.38 mbsf is unconsolidated and too soft to conduct permeability tests. The sand size fraction (>75 µm) is 88.5 wt%, and the estimated porosity is 40.5%.

1 Ijiri, A., Ikegawa, Y., and Inagaki, F., 2017. Data report: permeability of ~1.9 km-deep coal-bearing formation samples off the Shimokita Peninsula, Japan. In Inagaki, F., Hinrichs, K.-U., Kubo, Y., and the Expedition 337 Scientists, Proceedings of the Integrated Ocean Drilling Program, 337: Tokyo (Integrated Ocean Drilling Program Management International, Inc.).

2 Kochi Institute for Core Sample Research, Japan Agency for Marine Science and Technology (JAMSTEC), Nankoku, Kochi 783-8502, Japan.
Correspondence author:

3 Research and Development Center for Submarine Resources, JAMSTEC, Yokosuka 237-0061, Japan.

4 Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI), Chiba 270-1194, Japan.

5 Research and Development Center for Ocean Drilling Science, JAMSTEC, Yokohama 236-0001, Japan.

Initial receipt: 12 April 2016
Acceptance: 2 May, 2017
Publication: 7 July 2017
MS 337-202