Analysis of small-scale heterogeneity in clastic rocks by using computerized X-ray tomography (CT)

Janos Geiger, Zoltan Hunyadfalvi, P. Bogner

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The aim of this study is to recognize the basic clastic rock types on the basis of Hounsfield Units (HUs) by using statistical methods (hypothesis tests, distribution fitting, and confidence intervals). How does this recognition depend on depositional history of samples tested? Does the numerical pattern of HUs obtained from small-scale analyzing of some particular sedimentary structures coincide to the textural expectations of those sedimentary structures? Are the HU values provided by the CT measurements capable of evidencing micro-cycles belonging to a particular depositional history? For testing the numerical recognition, we analyze macroscopically homogeneous argillaceous marl, siltstone and fine sandstone samples with similar depositional background, age, and degree of diagenesis. The preliminary research shows that the Hounsfield Units can identify different sedimentary rocks considerably well. There are significant differences among the confidence intervals belonging to the different rock types. However, there also have been some slight overlaps among them. For analyzing the effects of the depositional processes in case of a particular rock type, samples from channel sandstone, distributary mouth-bar, massive (structureless) sandstone from a delta-fed turbidity fan, and channel sandstone with traction carpet origin from a delta-fed turbidity fan (all coming from Pannonian basin filling series) are used. The results prove again the significant differences in the terms of both confidence intervals and distribution-types; however, some overlapping also occurs.

Original languageEnglish
Pages (from-to)112-118
Number of pages7
JournalEngineering Geology
Volume103
Issue number3-4
DOIs
Publication statusPublished - Feb 10 2009

Fingerprint

clastic rock
Sandstone
tomography
Tomography
Rocks
sandstone
confidence interval
X rays
sedimentary structure
Turbidity
Fans
turbidity
Sedimentary rocks
marl
history
siltstone
rock
diagenesis
sedimentary rock
Statistical methods

Keywords

  • Bulk density
  • Clastic sediments
  • CT scanning
  • Geostatistics
  • Heterogeneity
  • Hounsfield Unit

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

Cite this

Analysis of small-scale heterogeneity in clastic rocks by using computerized X-ray tomography (CT). / Geiger, Janos; Hunyadfalvi, Zoltan; Bogner, P.

In: Engineering Geology, Vol. 103, No. 3-4, 10.02.2009, p. 112-118.

Research output: Contribution to journalArticle

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