Numerical estimation of Carbonate properties using a digital rock physics workflow
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2014
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Digital rock physics combines modern imaging with advanced numerical simulations to analyze the physical properties of rocks -- In this paper we suggest a special segmentation procedure which is applied to a carbonate rock from Switzerland -- Starting point is a CTscan of a specimen of Hauptmuschelkalk -- The first step applied to the raw image data is a nonlocal mean filter -- We then apply different thresholds to identify pores and solid phases -- Because we are aware of a nonneglectable amount of unresolved microporosity we also define intermediate phases -- Based on this segmentation determine porositydependent values for the pwave velocity and for the permeability -- The porosity measured in the laboratory is then used to compare our numerical data with experimental data -- We observe a good agreement -- Future work includes an analytic validation to the numerical results of the pwave velocity upper bound, employing different filters for the image segmentation and using data with higher resolution
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Rocas - Popiedades físicas
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@inproceedings{Osorno_etal_2014_DigitRock,
author={M. C. Osorno and D. Uribe and E. H. Saenger and C. Madonna and H. Steeb and O. Ruiz.},
title={Numerical estimation of carbonate properties using a digital rock physics workflow.},
booktitle={76th EAGE Meeting},
year={2014},
editor={},
address={Amsterdam, Netherlands},
pages={},
note={},
url={},
document_type={Extended Abstract.},
month={16-19 June},
publisher ={},
organization={European Association of Geoscientists and Engineers},
note={},
abstract ={In this paper we investigate a dry carbonate specimen (Hauptmuschelkalk) that originates from a core drilled in northern Switzerland. The corresponding CT-image raw-data is taken from Madonna et al. (2013). The voxel size is 0.38m3. Experimental results indicate a porosity of 4.2 \%, a permeability of 4*10-4 mD and a p-wave velocity from 5100 m/s (0 MPa confining pressure) to 6100 m/s (150 MPa confining pressure).}
}