Abstarct: According to increasing in the need for energy and due to the dependence of various industries on fossil fuels,makes artisans in the oil and gas field to think about increasing production from current fields. These conditions required new methods to be introduced, among which the most important are hydraulic fracturing. This method includes injection of fluid with pressure inside the formation to create a fracture and its propagation inside the formation. Several factors can be effective in terms of creating fractures and their geometries, which can be considered as a major factor in the existence of natural fractures. Differences in fractures in geometric properties can creates new conditions for the operation and the type of hydraulic fracture. Therefore, the study of their behavior before the operation is inevitable. In this study, natural fractures were investigated using separate fracture network and hydraulic fracture process using numerical method of discrete element method. In this study, the geometric properties of fractures such as density, fracture length and orientation and its effect on hydraulic fractures have been studied. The results indicate that the characteristics of the fracture network and the fracture geometry can affect the hydraulic fracture tratment and control the results, and in most cases provide promising results in estimating the reservoir's response to fluid injections. At the end, in one of the wells of Bangestan reservoir of Ahwaz, the conditions of hydraulic fracture were studied solely baxsed on fracture geometry in the Sarvak Formation zones. Comparing the results with a parametric study indicates the proportion between them.