Abstarct: “Fractures” are one of the major permeable factors in hydrocarbons systems. Among all the characteristics of fractures, “Roughness” and “Aperture” are the most critical parameters affecting them. So, in this thesis, these two important parameters have been directly studied experimentally. For this purpose, after testing over 70 different ideas, synthetic cores were made of Reactive Powder Concrete (RPC). Also, plugs made from these cores passed the quality control tests. In the process of construction, roughness patterns with specified thickness as aperture was made using laser engraving (marking) and annealing technologies. Before this step, scale-baxsed and method-baxsed calculations were performed. These patterns as templates were used in molding. At the calculation stage, fractal geometry and wavelet transform analysis were used to measure the roughness. Along this path, a new analytical relation to calculate the roughness of sawtooth patterns was presented for the first time. It began with the creation of more than 700,000 synthetic data. After presenting a heuristic algorithm to calculate the fractal dimension in surface space with reduced topological dimension and generalize its results to Joint Roughness Coefficient (JRC) profiles, JRCN as new model was presented baxsed on fractal geometry, wavelet transform analysis and data fusion to replace JRC. Next, these results were used to measure the roughness of the sawtooth non-randomly controlled pattern. Plugs made in two groups with constant roughness / apertures were tested for core flooding. Comparing the results of this experiment led to record new behavior by fractures. These results show the harmonic behavior of fractures under fluid injection. The truth of this claim has been substantiated by repeated experiments. Also, that’s results have been validated on natural plug. This validation core is taken from the Lar formation that is very similar to the Sarvak and Mozdooran formations. These results and the observed pressure drop in the case of manufactured semi-natural fracture show that observed trend at constant roughness is similar to 1.0 mm apertures. Therefore, the results of this study can be considered as a new factor for roughness and aperture in studies.