The effect of x-ray micro-ct geometrical zooming on the microstructure properties of porous medium

Padjadjaran Earth Dialogues, International Symposium on Geophysical Issues

Ramadhan, F.W.^1 ; Latief, F.D.E.^1

Physics of Earth and Complex Systems, Bandung Institute of Technology, Jalan Ganesha 10, Bandung

40132, Indonesia^1

关键词: Grain size distribution;    Microstructure properties;    Radiation source;    Reconstruction process;    Sample position;    Scanning device;    Steady-state fluid flow;    X ray micro-computed tomography;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/311/1/012044/pdf
DOI  :  10.1088/1755-1315/311/1/012044

来源: IOP

【 摘 要 】

Digital rock physics has evolved rapidly due to its various advantages such as being able to see rock images in 3D without non-destructively. In this study, 3D images of porous medium sample were generated from X-ray micro computed tomography scanning device SkyScan 1173. This study aims to investigate the effect of X-ray Micro-CT geometrical zooming (sample position to the X-Ray source) on the microstructure properties of porous medium such as porosity, specific surface area, tortuosity, permeability and grain size distribution. The rocks tested were concrete sand samples. The distance between source and object was varied 3 times. The scan was processed through reconstruction process until thresholding. Porosity, specific surface area and grain was calculated by CTAn software. Tortuosity was calculated by finding the path at 26 neighboring pixels and the permeability was calculated by simulating a steady state fluid flow. The result is the greater the distance between the radiation source and the object, the smaller the resolution of the image. This causes some pores that are too small that eventually are grouped into rock matrix. Therefore, pore-related properties such as porosity and specific surface area will decrease, tortuosity will increase and permeability will decrease.