The existence of crack-type pore spaces in geothermal reservoir rock is considered significant because of the ability to transport fluids such as water vapour. Various 2D characterizations of cracks have been developed in the past. In recent decades, the development of imaging techniques has enabled better understanding of the nature of these cracks. Micro-CT was used in this research to obtain 3D images of geothermal reservoir rock from West Java. The reconstructed digital images of the sample had spatial resolution of 59.85 [micro]m/pixel. 2D and 3D display of the digital samples was conducted using software. Various image processing techniques are widely available to characterize the digital data of the sample. Our analysis found values of total porosity to by 6.27[percent] and volume fraction of the cracks at 2.79[percent]. It is concluded that the existence of cracks in the pore space provides a significant means of transporting fluid in the sample.