1. A method that comprises: capturing pre-treatment computed tomography (CT) images of a rock sample comprising at least one sub-sample portion and a remainder portion, wherein the pre-treatment CT images are captured while the at least one sub-sample portion and the remainder portion are physically separated; capturing post-treatment CT images of the at least one sub-sample portion and the remainder portion while physically separated, wherein the treatment comprises a permeability or porosity adjustment treatment that is applied while the at least one sub-sample portion and the remainder portion are rejoined together; comparing at least some of the pre-treatment CT images with respective post-treatment CT images; and generating a report that describes the treatment's effect based on said comparison.