Preprints
https://doi.org/10.5194/se-2021-150
https://doi.org/10.5194/se-2021-150
 
08 Feb 2022
08 Feb 2022
Status: this preprint was under review for the journal SE. A final paper is not foreseen.

The estimation of porosity in Japan Trench plate boundary using low-resolution X-ray computed tomography (XCT) images and laboratory measurements

Hamed Amiri1, Francesco Cappuccio2, Mai-Linh Doan1, Marianne Conin3, and Virginia Toy2 Hamed Amiri et al.
  • 1Université Grenoble Alpes, Institut des Sciences de la Terre (ISTerre), Grenoble, 38058, France
  • 2Institute of Geosciences, Johannes Gutenberg University Mainz, Mainz, 55128, Germany
  • 3University of Lorraine, CNRS, Nancy, 54000, France

Abstract. X-ray computed tomography (XCT) is an advanced imaging technique that has been increasingly used in the past years because it can provide valuable information on internal structures of a rock sample in a non-invasive manner. The maximum resolution of lab-based XCT facilities is ~0.5 μm, which might be sufficient to capture macropores in some rocks (i.e., sandstone), but will result in underestimation of porosity in clay-rich sediments containing micro-and nano-scale pores. Furthermore, such high-resolution XCT facilities are quite expensive and not ubiquitous. In this study, we introduce a new methodology based on the K-means clustering algorithm to process of low-resolution XCT images, illustrating its capability through porosity analysis of drillcores obtained during Integrated Ocean Drilling Program (IODP) expedition 343. The cation exchange capacity (CEC) of the squeezed samples of the same cores was also measured and used to correct shipboard measurements of Moisture and Density (MAD) porosity for the effect of the water bound in the interlayer clay particles, thereby calculating interstitial porosity. The results indicate that the porosities estimated by our method are in agreement with these MAD_derived interstitial porosities in several cores acquired from the overthrusted sediments above the Japan trench plate boundary. Also, considering interstitial porosity as a realistic measurement of porosity, the results show that our semi-automatic method improves estimations compared with a manual thresholding segmentation, as the latter suffers from user subjectivity.

This preprint has been withdrawn.

Hamed Amiri et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-150', Anonymous Referee #1, 24 Feb 2022
  • RC2: 'Comment on se-2021-150', Anonymous Referee #2, 31 Mar 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on se-2021-150', Anonymous Referee #1, 24 Feb 2022
  • RC2: 'Comment on se-2021-150', Anonymous Referee #2, 31 Mar 2022

Hamed Amiri et al.

Hamed Amiri et al.

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This preprint has been withdrawn.

Short summary
In March 2011, the Mw ~9 Tohoku-oki earthquake, one of the largest seismic events ever recorded, occurred across a megathrust fault in the west of the Japan trench. This devastating earthquake stressed the need for more detailed studies on the fault zone behavior and the main causes of this event.