TY - JOUR
T1 - A new method for quality control of geological cores by X-Ray computed tomography
T2 - Application in IODP expedition 370
AU - Expedition 370 Scientists
AU - Tonai, Satoshi
AU - Kubo, Yusuke
AU - Tsang, Man Yin
AU - Bowden, Stephen
AU - Ide, Kotaro
AU - Hirose, Takehiro
AU - Kamiya, Nana
AU - Yamamoto, Yuzuru
AU - Yang, Kiho
AU - Yamada, Yasuhiro
AU - Morono, Yuki
AU - Heuer, Verena B.
AU - Inagaki, Fumio
AU - Manners, Hayley
N1 - Publisher Copyright:
© 2019 Tonai, Kubo, Tsang, Bowden, Ide, Hirose, Kamiya, Yamamoto, Yang, Yamada, Morono, Heuer, Inagaki and Expedition 370 Scientists.
PY - 2019/6/18
Y1 - 2019/6/18
N2 - X-ray computed tomography (XCT) can be used to identify lithologies and deformation structures within geological core, with the potential for the identification processes to be applied automatically. However, because of drilling disturbance and other artifacts, the use of large XCT-datasets in automated processes requires methods of quality control that can be applied systematically. We propose a new systematic method for quality control of XCT data that applies numerical measures to CT slices, and from this obtains data reflective of core quality. Because the measures are numerical they can be applied quickly and consistently between different sections and cores. This quality control processing protocol produces downhole radiodensity profiles from mean CT-values that can be used for geological interpretation. The application of this quality control protocols was applied to XCT data from International Ocean Discovery Program (IODP) Expedition 370 Site C0023 located at the toe of the Nankai accretionary complex. The evaluation of core quality based on this protocol was found to be a good fit to standard-evaluations based on the visual description of core, and could be used to select samples free from drilling disturbance or contamination. The quality-controlled downhole mean CT-value profile has features that can be used to identify lithologies within a formation, the presence and type of deformation structures and to distinguish formations.
AB - X-ray computed tomography (XCT) can be used to identify lithologies and deformation structures within geological core, with the potential for the identification processes to be applied automatically. However, because of drilling disturbance and other artifacts, the use of large XCT-datasets in automated processes requires methods of quality control that can be applied systematically. We propose a new systematic method for quality control of XCT data that applies numerical measures to CT slices, and from this obtains data reflective of core quality. Because the measures are numerical they can be applied quickly and consistently between different sections and cores. This quality control processing protocol produces downhole radiodensity profiles from mean CT-values that can be used for geological interpretation. The application of this quality control protocols was applied to XCT data from International Ocean Discovery Program (IODP) Expedition 370 Site C0023 located at the toe of the Nankai accretionary complex. The evaluation of core quality based on this protocol was found to be a good fit to standard-evaluations based on the visual description of core, and could be used to select samples free from drilling disturbance or contamination. The quality-controlled downhole mean CT-value profile has features that can be used to identify lithologies within a formation, the presence and type of deformation structures and to distinguish formations.
KW - Accretionary complex
KW - International Ocean Discovery Program
KW - Nankai Trough
KW - Scientific drilling
KW - X-ray computed tomography
UR - http://www.scopus.com/inward/record.url?scp=85068446894&partnerID=8YFLogxK
U2 - 10.3389/feart.2019.00117
DO - 10.3389/feart.2019.00117
M3 - Article
AN - SCOPUS:85068446894
SN - 2296-6463
VL - 7
JO - Frontiers in Earth Science
JF - Frontiers in Earth Science
M1 - 117
ER -
