Applications of X-ray computed tomography in the geosciences by Geological Society Publications

By Geological Society Publications

X-ray computed tomography (CT) is a method that permits non-destructive imaging and quantification of inner beneficial properties of gadgets. It was once initially built as a scientific imaging process, however it is now additionally turning into standard for the examine of fabrics in engineering and the geosciences. X-ray CT unearths changes in density and atomic composition and will hence be used for the examine of porosity, the relative distribution of contrasting good stages and the penetration of injected ideas. As a non-destructive strategy, it truly is ultimate for tracking of procedures, reminiscent of the circulate of recommendations and the behaviour of fabrics lower than compression. simply because huge numbers of parallel two-dimensional cross-sections should be bought, 3-dimensional representations of chosen beneficial properties could be created. during this ebook, a variety of purposes of X-ray CT within the geosciences are illustrated by way of papers overlaying quite a lot of disciplines, together with petrology, soil technology, petroleum geology, geomechanics and sedimentology.

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VAN GRIEKEN6, F. ADAMS6 & C. gov) Department of Earth and Environmental Studies, Montclair State University, Upper Montclair, New Jersey 07043, USA ^Department of Applied Mathematics and Statistics, State University of New York, Stony Brook, New York 11794-3600, USA 4 Institut de Physique du Globe de Paris, F-75252 Paris Cedex 05, France 5 LCD-PTM, F-86960 Futuroscope Cedex, France 6 7 Department of Chemistry, University of Antwerp, B-2610 Wilrijk, Belgium European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France Abstract: A series of measurements of the structure of a variety of porous materials has been made using synchrotron computed microtomography (SCMT).

If conventional scanning of cross-sections along the length of a core is employed, one can estimate the location of the flood front and the time it takes to scan the front. A greater number of scans can then be collected at the location of the front. Another method is to stop the experiment at a particular moment to take scans (Siddiqui et al. 1996; Closmann & Vinegar 1993). However, capillary and viscous forces cause redistribution of fluids within the core and can effect the results dramatically.

Linear regression The procedure described previously assumes that no information is available except for the two pure states. Usually, average saturations at residual states are known from other laboratory techniques such as Dean-Stark extraction. Therefore, complete drying of the core and resaturation with oil can be avoided by scanning the core at connate water saturation, Swc, which can be easily obtained from material balance. At connate water saturation, Eq. 13 can be written as where the subscript swcr denotes a CT measurement of a core at connate water saturation.

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