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Abstract

Electronic copies of this series may be obtained from the Integrated Ocean Drilling Program (IODP) Scientific Publications homepage on the World Wide Web at www.iodp.org/scientificpublications/.

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

“…We conducted permeability experiments on two lignite coal samples taken at 1919.57 and 1922.95 meters below seafloor (mbsf) and a grain-size analysis porosity measurement on one sand sample taken at 1925.38 mbsf from lithologic Unit III (1826.5-2046.5 mbsf) in a coal-bearing formation dominated by several coal horizons at Site C0020 (Inagaki et al, 2012). Water content, color, and vitrinite reflectance measurements suggest the coal has low maturity (Inagaki et al, 2012;Gross et al, 2015;Tanikawa et al, 2016).…”

“…Water content, color, and vitrinite reflectance measurements suggest the coal has low maturity (Inagaki et al, 2012;Gross et al, 2015;Tanikawa et al, 2016). The sand sample is unconsolidated and extremely soft (i.e., beach sand) (see the "Site C0020" chapter [Expedition 337 Scientists, 2013]).…”

“…The sand sample is unconsolidated and extremely soft (i.e., beach sand) (see the "Site C0020" chapter [Expedition 337 Scientists, 2013]). The sand layers, which were almost impossible to retrieve intact by riserless drilling, were successfully recovered by riser drilling using high-density mud (Inagaki et al, 2012). Half-round core samples that yielded the coal samples were sealed by a gas barrier film (Escal Neo; Mitsubishi Gas Chemical Company, Inc., Japan) after collection and stored at 4°C to maintain their natural water content until sampling.…”

“…The temperature of the confining fluid was fixed at 50°C, which is similar to the ambient temperature at 1900 mbsf (Inagaki et al, 2012;Tanikawa et al, 2016). The temperature of the confining fluid in the pressure vessel was regulated by a constant-temperature fluid circulating in which a silicon oil is circulated through the heater (Julabo, Baden-Württem-berg, Germany, HE) and around the pressure vessel ( Figure F1).…”

“…One of the scientific objectives of Integrated Ocean Drilling Program (IODP) Expedition 337 was to examine the feasibility of geological CO 2 sequestration in deep offshore coal-formation repositories (Inagaki et al, 2012). Riser drilling during Expedition 337 penetrated a 2466 m deep sedimentary sequence at Site C0020 that included a series of coal-bearing layers at ~1.9-2.0 km below seafloor where microbial methanogenesis via CO 2 reduction was observed (Inagaki et al, 2015).…”