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Quantified fracture (joint) clustering in Archean basement, Wyoming: application of the normalized correlation count method

View ORCID ProfileQiqi Wang, View ORCID ProfileS. E. Laubach, J. F. W. Gale and View ORCID ProfileM. J. Ramos
Petroleum Geoscience, 25, 415-428, 1 July 2019, https://doi.org/10.1144/petgeo2018-146
Qiqi Wang
1Department of Geological Sciences, University of Texas at Austin, 2275 Speedway Stop C9000, , , USA
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
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  • ORCID record for Qiqi Wang
  • For correspondence: wangqiqi@utexas.edu
S. E. Laubach
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
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J. F. W. Gale
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
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M. J. Ramos
1Department of Geological Sciences, University of Texas at Austin, 2275 Speedway Stop C9000, , , USA
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
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Abstract

We demonstrate statistically significant self-organized clustering over a length scale range from 10−2 to 101 m for north-striking opening-mode fractures (joints) in Late Archean Mount Owen Quartz Monzonite. Spatial arrangement is a critical fracture network attribute that until recently has only been assessed qualitatively. We use normalized fracture intensity plots and the normalized correlation count (NCC) method of Marrett et al. to discriminate clustered from randomly placed or evenly spaced patterns quantitatively over a wide range of length scales and to test the statistical significance of the resulting patterns. We propose a procedure for interpreting cluster patterns on NCC diagrams generated by the freely available spatial analysis software CorrCount. Results illustrate the efficacy of NCC to measure fracture clustering patterns in texturally homogeneous Archean granitic rock in a setting distant (>2 km) from folds or faults. In their current geological setting, these regional fractures are conduits for water flow and their patterns – and the NCC approach to defining clusters – may be useful guides to the spatial arrangement style and clustering magnitude of conductive fractures in other, less accessible fractured basement rocks.

Thematic collection: This article is part of the Naturally Fractured Reservoirs collection available at: https://www.lyellcollection.org/cc/naturally-fractured-reservoirs

  • © 2019 The Author(s). Published by The Geological Society of London for GSL and EAGE
http://creativecommons.org/licenses/by/4.0/

This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/)

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Petroleum Geoscience: 25 (4)
Petroleum Geoscience
Volume 25, Issue 4
November 2019
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Quantified fracture (joint) clustering in Archean basement, Wyoming: application of the normalized correlation count method

Qiqi Wang, S. E. Laubach, J. F. W. Gale and M. J. Ramos
Petroleum Geoscience, 25, 415-428, 1 July 2019, https://doi.org/10.1144/petgeo2018-146
Qiqi Wang
1Department of Geological Sciences, University of Texas at Austin, 2275 Speedway Stop C9000, , , USA
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Qiqi Wang
  • For correspondence: wangqiqi@utexas.edu
S. E. Laubach
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for S. E. Laubach
J. F. W. Gale
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
M. J. Ramos
1Department of Geological Sciences, University of Texas at Austin, 2275 Speedway Stop C9000, , , USA
2Bureau of Economic Geology, University of Texas at Austin, 10100 Burnet Road, , , USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for M. J. Ramos

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Quantified fracture (joint) clustering in Archean basement, Wyoming: application of the normalized correlation count method

Qiqi Wang, S. E. Laubach, J. F. W. Gale and M. J. Ramos
Petroleum Geoscience, 25, 415-428, 1 July 2019, https://doi.org/10.1144/petgeo2018-146
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