A new method for quality control of geological cores by X-Ray computed tomography

Application in IODP expedition 370

Expedition 370 Scientists

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number117
Number of pages13
JournalFrontiers in Earth Science
Volume7
Early online date31 May 2019
DOIs
Publication statusPublished - 31 May 2019

Fingerprint

quality control
tomography
ocean
lithology
drilling
disturbance
geological structure
artifact
programme
method
protocol
evaluation

Keywords

  • Accretionary complex
  • International Ocean Discovery Program
  • Nankai Trough
  • Scientific drilling
  • X-ray computed tomography
  • ROCKS
  • ACCRETIONARY PRISM
  • accretionary complex
  • QUANTITATIVE-ANALYSIS
  • DEFORMATION
  • FLOW
  • IMAGE
  • SEDIMENT
  • scientific drilling
  • NANKAI TROUGH

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

A new method for quality control of geological cores by X-Ray computed tomography : Application in IODP expedition 370. / Expedition 370 Scientists.

In: Frontiers in Earth Science, Vol. 7, 117, 31.05.2019.

Research output: Contribution to journalArticle

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abstract = "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.",
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author = "Satoshi Tonai and Yusuke Kubo and Tsang, {Man Yin} and Stephen Bowden and Kotaro Ide and Takehiro Hirose and Nana Kamiya and Yuzuru Yamamoto and Kiho Yang and Yasuhiro Yamada and Yuki Morono and Heuer, {Verena B.} and Fumio Inagaki and {Expedition 370 Scientists}",
note = "ACKNOWLEDGMENTS This research used data provided by the International Ocean Discovery Program (IODP). We are grateful to the IODP and thank crew, drilling team, geologists and lab technicians on Chikyu and the staff of the Kochi Institute for Core Sample Research for supporting IODP 370-operations. We would like to thank Lucia Mancini for handling the editorial process and the three reviewers for submitting their helpful comments and improving the manuscript.",
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T2 - Application in IODP expedition 370

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 - Expedition 370 Scientists

N1 - ACKNOWLEDGMENTS This research used data provided by the International Ocean Discovery Program (IODP). We are grateful to the IODP and thank crew, drilling team, geologists and lab technicians on Chikyu and the staff of the Kochi Institute for Core Sample Research for supporting IODP 370-operations. We would like to thank Lucia Mancini for handling the editorial process and the three reviewers for submitting their helpful comments and improving the manuscript.

PY - 2019/5/31

Y1 - 2019/5/31

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.

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KW - International Ocean Discovery Program

KW - Nankai Trough

KW - Scientific drilling

KW - X-ray computed tomography

KW - ROCKS

KW - ACCRETIONARY PRISM

KW - accretionary complex

KW - QUANTITATIVE-ANALYSIS

KW - DEFORMATION

KW - FLOW

KW - IMAGE

KW - SEDIMENT

KW - scientific drilling

KW - NANKAI TROUGH

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U2 - 10.3389/feart.2019.00117

DO - 10.3389/feart.2019.00117

M3 - Article

VL - 7

JO - Frontiers in Earth Science

JF - Frontiers in Earth Science

SN - 2296-6463

M1 - 117

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