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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%.

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