Mohammad Reza Haddad Tehrani, Mehdi Talkhablou, Mohammad Reza Asef, Mehdi Ostad Hasan,
Volume 19, Issue 6 (12-2025)
For a detailed study of the geomechanical behavior of a hydrocarbon field, the existence of a three-dimensional numerical model that can describe the geomechanical properties and characteristics of the reservoir is necessary. In this study, equations related to geomechanical modeling have been used to estimate some parameters such as effective stresses. This examination, using available data and information, studies and analyzes the elastic behavior of the Asmari reservoir in one of the fields in southwestern Iran and eventually addresses the construction of its three-dimensional geomechanical model. For modeling, the characteristics of effective porosity, absolute permeability, and water saturation were used from the well survey data related to that characteristic in all the wells, which were recalibrated by the core data. In this regard, variogram-based geostatistical methods were used. Also, in this research, the stress state is determined based on the theories and assumptions related to the well. For the three-dimensional modeling of lithostatic pressure or vertical stress, this stress was calculated and modeled in three dimensions by using the data of the density of the overlying rocks of the reservoir (from the ground level to the top of the Asmari formation) and also using the topography data of the ground surface. According to the prepared model, the maximum vertical stress was calculated to be 87 MPa, and the maximum horizontal stress values were up to 127 MPa. Meanwhile, the three-dimensional Gaussian simulation modeling method, as an efficient method, shows over 95% agreement between the real data and the modeled data for rock mechanics parameters such as Young's and shear moduli, and also over 88% agreement for the stress values modeled in three dimensions with the stress values obtained from one-dimensional geomechanical models.
