The image contains the segmented dataset of a subset (SSa) obtained after a drainage-imbibition cycle. The filtered image was segmented into three phases (solid, oil and brine) with a seeded watershed algorithm based on the gray-scale gradient and gray-scale intensity of each voxel. In the segmented image, 1, 2 and 3 represent oil, brine and rock respectively. Usage notes: The tomographic data can be imported as .raw files on an open source software ‘ImageJ’ (http://imagej.nih.gov/ij). The brightness and contrast can be adjusted (if the image does not appear after loading) from the tab ImageJ>Image>Adjust>Brightness/Contrast (change the maximum value from 255 to 3). ImageJ has many available plugins for image processing and analysis. For three-dimensional visualization, the data can be loaded on an open source software ‘Drishti’ (https://github.com/nci/drishti/wiki). The data can also be loaded and processed on a commercial software ‘Avizo’ (https://www.fei.com/software/amira-avizo/), which is a powerful tool for data processing and analysis.
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