Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Effect of CT image size and resolution on the accuracy of rock property estimates. / Bazaikin, Y.; Gurevich, B.; Iglauer, S. и др.
в: Journal of Geophysical Research: Solid Earth, Том 122, № 5, 01.05.2017, стр. 3635-3647.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - Effect of CT image size and resolution on the accuracy of rock property estimates
AU - Bazaikin, Y.
AU - Gurevich, B.
AU - Iglauer, S.
AU - Khachkova, T.
AU - Kolyukhin, D.
AU - Lebedev, M.
AU - Lisitsa, V.
AU - Reshetova, G.
PY - 2017/5/1
Y1 - 2017/5/1
N2 - In order to study the effect of the micro-CT scan resolution and size on the accuracy of upscaled digital rock property estimation of core samples Bentheimer sandstone images with the resolution varying from 0.9 μm to 24 μm are used. We statistically show that the correlation length of the pore-to-matrix distribution can be reliably determined for the images with the resolution finer than 9 voxels per correlation length and the representative volume for this property is about 153 correlation length. Similar resolution values for the statistically representative volume are also valid for the estimation of the total porosity, specific surface area, mean curvature, and topology of the pore space. Only the total porosity and the number of isolated pores are stably recovered, whereas geometry and the topological measures of the pore space are strongly affected by the resolution change. We also simulate fluid flow in the pore space and estimate permeability and tortuosity of the sample. The results demonstrate that the representative volume for the transport property calculation should be greater than 50 correlation lengths of pore-to-matrix distribution. On the other hand, permeability estimation based on the statistical analysis of equivalent realizations shows some weak influence of the resolution on the transport properties. The reason for this might be that the characteristic scale of the particular physical processes may affect the result stronger than the model (image) scale.
AB - In order to study the effect of the micro-CT scan resolution and size on the accuracy of upscaled digital rock property estimation of core samples Bentheimer sandstone images with the resolution varying from 0.9 μm to 24 μm are used. We statistically show that the correlation length of the pore-to-matrix distribution can be reliably determined for the images with the resolution finer than 9 voxels per correlation length and the representative volume for this property is about 153 correlation length. Similar resolution values for the statistically representative volume are also valid for the estimation of the total porosity, specific surface area, mean curvature, and topology of the pore space. Only the total porosity and the number of isolated pores are stably recovered, whereas geometry and the topological measures of the pore space are strongly affected by the resolution change. We also simulate fluid flow in the pore space and estimate permeability and tortuosity of the sample. The results demonstrate that the representative volume for the transport property calculation should be greater than 50 correlation lengths of pore-to-matrix distribution. On the other hand, permeability estimation based on the statistical analysis of equivalent realizations shows some weak influence of the resolution on the transport properties. The reason for this might be that the characteristic scale of the particular physical processes may affect the result stronger than the model (image) scale.
KW - statistically representative volume
KW - topology and geometry of the pore space
KW - transport properties of the rock
KW - MICRO-CT
KW - PERMEABILITY
KW - SANDSTONE
KW - RECONSTRUCTION
KW - VISCOSITY
KW - SIMULATION
KW - PORE-SCALE
KW - TOMOGRAPHIC-IMAGES
KW - EFFECTIVE ELASTIC PROPERTIES
KW - WAVE-PROPAGATION
UR - http://www.scopus.com/inward/record.url?scp=85019739172&partnerID=8YFLogxK
U2 - 10.1002/2016JB013575
DO - 10.1002/2016JB013575
M3 - Article
AN - SCOPUS:85019739172
VL - 122
SP - 3635
EP - 3647
JO - Journal of Geophysical Research: Solid Earth
JF - Journal of Geophysical Research: Solid Earth
SN - 2169-9313
IS - 5
ER -
ID: 10191040