TY - JOUR
T1 - Examination of gas hydrate-bearing deep ocean sediments by X-ray Computed Tomography and verification of physical property measurements of sediments
AU - NGHP Expedition 02 JAMSTEC Science Team
AU - Gupta, Lallan P.
AU - Tanikawa, Wataru
AU - Hamada, Yohei
AU - Hirose, Takehiro
AU - Ahagon, Naokazu
AU - Sugihara, Takamitsu
AU - Abe, Natsue
AU - Nomura, Shun
AU - Masaki, Yuka
AU - Wu, Hung Y.
AU - Lin, Weiren
AU - Kinoshita, Masataka
AU - Yamada, Yasuhiro
N1 - Funding Information:
The authors are thankful to the Ministry of Petroleum & Natural Gas within the Government of India, Oil and Natural Gas Corporation Limited (ONGC), Directorate General of Hydrocarbons (DGH), Oil India Ltd, GAIL (India) Ltd, Indian Oil Corporation Ltd and all other NGHP partner organizations for providing the opportunity to contribute to the NGHP-02 Expedition and this special issue of the Journal of Marine and Petroleum Geology. The technical and science support from Japan Agency for Marine-Earth Science and Technology (JAMSTEC), United States Geological Survey (USGS), U.S. Department of Energy (US-DOE), the National Institute of Advanced Industrial Science and Technology (AIST), Geotek Coring and Schlumberger is gratefully acknowledged. Excellent technical and logistical support received on the drilling vessel D/V Chikyu was crucial to this research, which was funded by a special grant from the JAMSTEC for the NGHP-02 related studies. Constructive comments by 2 anonymous reviewers helped improve the manuscript significantly.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/10
Y1 - 2019/10
N2 - Physical properties like porosity and density are important parameters for size estimations of fossil fuel reservoir in host sediments and rocks. X-ray CT based imaging and subsequent analysis of the images by using various techniques for estimations of these properties of host rocks and sediments has been attempted. However, most of those techniques tend to be biased and subjective due to complications in image processing. Here we describe a new procedure for estimating porosity and density without processing the XCT images, but using the raw data that are used for producing the images. In this study, large-size cylindrical core samples (up to 150 cm long and 6.6 cm diameter) were imaged in a matter of minutes by using a medical XCT scanner soon after their recovery from seafloor onboard drillship in order to record as realistic as possible condition of hydrate-bearing sediments. Despite some uncertainty in relative volumes of solid, liquid and gas phases at voxel level, the results obtained by this rapid and non-destructive procedure are in good agreement with those obtained by time- and sample-consuming conventional methods of physical property measurements.
AB - Physical properties like porosity and density are important parameters for size estimations of fossil fuel reservoir in host sediments and rocks. X-ray CT based imaging and subsequent analysis of the images by using various techniques for estimations of these properties of host rocks and sediments has been attempted. However, most of those techniques tend to be biased and subjective due to complications in image processing. Here we describe a new procedure for estimating porosity and density without processing the XCT images, but using the raw data that are used for producing the images. In this study, large-size cylindrical core samples (up to 150 cm long and 6.6 cm diameter) were imaged in a matter of minutes by using a medical XCT scanner soon after their recovery from seafloor onboard drillship in order to record as realistic as possible condition of hydrate-bearing sediments. Despite some uncertainty in relative volumes of solid, liquid and gas phases at voxel level, the results obtained by this rapid and non-destructive procedure are in good agreement with those obtained by time- and sample-consuming conventional methods of physical property measurements.
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U2 - 10.1016/j.marpetgeo.2018.05.033
DO - 10.1016/j.marpetgeo.2018.05.033
M3 - Article
AN - SCOPUS:85048733312
SN - 0264-8172
VL - 108
SP - 239
EP - 248
JO - Marine and Petroleum Geology
JF - Marine and Petroleum Geology
ER -