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Kadidia-Sigi, Central Sulawesis geothermal potential area has impermeable hoods with a high level of clay minerals (illite) in alteration regions around geothermal manifestations. Breccia rock samples were taken from one of the wells that had been analyzed to see the effect of temperature on changes in 3D rock structure. Rock samples were given heat induction treatment with varying temperatures ranging from 24°C (room temperature), 100°C, 150°C, 200°C, to 250°C. Samples at room temperature that have been given treatment are scanned with a Micro-Computed Tomography Scan (µ-CT Scan) instrument. 300 images of the µ-CT Scan results were reconstructed and characterized by 3D changes in the pore structure, minerals, and fractures using digital image processing. The results obtained in the form of pore grain size distribution, mineral grain size distribution and porosity rock size {{(T)}, specific surface area {SsA (T)} which tends to increase polynomially in pore and mineral structures. The results of fracture are obtained in the form of the main parameters, namely aperture {e (T)}, density {? (T)}, and intensity {I (T)}. Changes in micro structure (Nfracture) which is the cause of changes in fractal properties in rock structures. Where fractal changes produce equations that show fractal dimensions as a function of temperature that occurs in the pore structure, minerals, and breccia rock fractures.