Acta Geologica Hungarica
Volume/Issue:
Volume 47: Issue 1
Heterogeneity analysis of clastic sediments by computerized X-ray tomographs
Author:
Zoltán Hunyadfalvi Department of Geology and Paleontology, University of Szeged H-6701 Szeged, P. O. Box. 658, Hungary

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Pages:
53–62
Online Publication Date:
22 Jul 2005
Publication Date:
01 Jun 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1556/ageol.47.2004.1.4
Keywords:
heterogeneity; heterogeneity; density; clastic sediment; CT scanning; Hounsfield Unit; degree of diagenesis; geostatistics
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The CT technique is unique because it provides a non-destructive evaluation of sedimentary rocks. The absorption of X-radiation, emitted by a high-voltage generator, depends on the bulk density and atomic weight of the substance. The lower the density of the material, the more transparent it is to X-rays. If the emitted energy is constant, the absorption depends only on the density of the substance, which is represented by different Hounsfield Units. In case study No. 1, a pelitic core sample of an ox-bow lake environment was analyzed. The mathematical-statistical estimates and significant time-series model (ARIMA) proved that the data coming from the CT images show the presence of micro-cycles. The applied method proved the influence of seasonal floods on local sedimentation. In case study No. 2, the data represent a younger and an older Bouma sequence. The macroscopic study suggests that there are two C units in the core, because an erosional surface is clearly identifiable between the older and the younger units. This case study shows the necessity of precise sedimentological knowledge in addition to that of mathematical-statistical methods and software, and that an accurate macroscopic study is essential and never replaceable. Also, it should be kept in mind that it is often reasonable to replace the conventional statistical conception with a geostatistical approach. The aim of this study was to demonstrate a “non-traditional” strategy in sedimentology and the interpretation thereof.

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Cover Acta Geologica Hungarica
Acta Geologica Hungarica
Print ISSN:
0236-5278
Online ISSN:
1588-2594

Acta Geologica Hungarica
Language English
Size  
Year of
Foundation		 1952
Publication
Programme		 changed title
Volumes
per Year		  
Issues
per Year		  
Founder Magyar Tudományos Akadémia  
Founder's
Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5278 (Print)
ISSN 1588-2594 (Online)

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