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- W1976574597 abstract "Before producing gas from gas hydrate, it is important to clarify the physical properties of the methane hydrate reservoir and its sediments. During the 2012 pressure coring campaign, pressure core samples were retrieved from the northwest slope of Daini-Atsumi Knoll, one of the outer ridges of fore-arc basins along the northeast the Nankai-Trough. The pressure cores were sampled continuously throughout the turbidite sequences in the Methane Hydrate Concentrated Zone (MHCZ); the cores were subjected to onboard nondestructive property analyses, and X-ray Computed Tomography (X-ray CT) images of the cores were collected. Internal structures of the cores were observed in the X-ray images, which were used to judge core quality. Results for P-wave velocities and bulk densities, which were also measured on the pressure cores aboard the ship were compared with data from logging-while-drilling (LWD). P-wave velocities of cores that were retrieved by pressure corer were compared with methane-hydrate saturations calculated from several methods. In general, P-wave velocities from logging while drilling (LWD) measurements corresponded to gas hydrate saturation calculated from LWD. After compensating for the different vertical resolutions of LWD tools and pressure core analysis, P-wave velocities from the pressure cores corresponded well to methane hydrate saturation calculated from logging. A unique interval at 290–300 m below seafloor was identified where methane hydrate saturations computed from LWD data did not correspond to P-wave anomalies measured in cores from the same interval. This difference could be due to lateral inhomogeneity in lithology between the logging and coring wells, with distinct local hydrate crystallization/precipitation environments." @default.
- W1976574597 created "2016-06-24" @default.
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- W1976574597 date "2015-09-01" @default.
- W1976574597 modified "2023-10-16" @default.
- W1976574597 title "Physical properties and sedimentological features of hydrate-bearing samples recovered from the first gas hydrate production test site on Daini-Atsumi Knoll around eastern Nankai Trough" @default.
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- W1976574597 doi "https://doi.org/10.1016/j.marpetgeo.2015.02.025" @default.
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