Method of porosity determination in porous media by x-ray computed tomography

摘要

A method for porosity determination in porous media such as earth and rock core samples by x-ray computed tomography in which a sample of the porous medium is scanned after saturation with a first reference fluid and then after saturation with a second reference fluid to determine the linear attenuation coefficients of the sample saturated with the respective fluids. The method includes determining the linear attenuation coefficients of the respective fluids and comparing the difference in the attenuation coefficient of the respective fluids and the attenuation coefficient of the samples as saturated with the fluids to determine the porosity of the porous medium. The respective fluids may be a gas and a liquid wherein the x-ray absorption of the two fluids is significantly different. The fluids may be different liquids or a single gas at different pressure conditions to obtain the different absorption characteristics.