This paper presents the pore space characterization of a sandstone reservoir rock carried out with a microfocus X-ray computed tomography(μ-CT) scanner using a cone-beam (Feldkamp) reconstruction algorithm.The sandstone sample was roughly cylindrical,3 mm wide and 5 mm high.The resulting spatial resolution of the image was 3.8μm,which allowed a very good visualization and enabled a geometric quantification of grains and pores.A total of 956 cross-sections were taken to render a 3D volume of the specimen. These cross-sections were processed in order to characterize the geometrical microstructure of the sample.Total porosity,pore size distribution and the two point correlation functions were measured after segmenting images.The pore size distribution was obtained through morphological operations performed using the appropriate structuring element based in chamfer metrics.A 3D microstructure of the sample was modeled based on the two point correlation function data using a truncated Gaussian method in the Fourier space.The geometrical parameters(porosity,pore size distribution and two point correlation function) were then measured in 2-D image slices from the Gaussian 3D model in order to compare with the same parameters from the 2D μ-CT images.This approach shows promise in allowing a thorough evaluation of the 3D model quantifying its resemblance with the real pore space depicted by the μ-CT 3D volume.
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