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| Titel |
Implication of rock heterogeneities on the optical scanning of thermal conductivity |
| VerfasserIn |
R. Jorand, Andreas Koch, C. Clauser |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250023480
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| Zusammenfassung |
| We want to find out (1) how sensitive are measurements of thermal conductivity to
heterogeneities in rocks? (2) How can we localize heterogeneities? Most methods for
measuring thermal conductivity do not allow detecting the variation of thermal conductivity
which results from heterogeneities. Yuri Popov and others conceived and developed a
high-resolution optical scanning method that yields a conductivity profile along a
scanning line. We use this method to study the effects of heterogeneities due to
microfractures, layering, changing mineral composition and rock structure on thermal
conductivity.
We studied two samples, a claystone rich in carbonate and a sample composed of
conglomerate, carbonate and claystone. At first, we scanned the samples in dry condition and
in two different directions. The measurements were performed with a resolution of 1 mm and
spacing between profiles of 5 mm. These measurements permit to localize the inclusions
of carbonate in the claystone and to identify the individual layers in the second
sample.
Thereafter, we saturated the second sample prior to measurement and calculated the
difference between the saturated and dry measurements. This allowed to quantify the
distribution of water in the samples. The result agrees well with a porosity profile obtained
from gamma-density measurements. It appears that our approach is useful to quantify the
effect of rock heterogeneity on the variation of thermal conductivity on a small scale. |
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