Abstract: This study has reviewed the geomechanical considerations and applications in reservoir modeling. Geomechanical studies are applied in the reservoir to establish some features as field subsidence/inflation and stability. The reservoir stress alters with the change in the pressure and temperature either by production or EOR injection/thermal methods. The field subsidence/inflation can damage surface facilities. The change in field new stress state could lead to the failure in some rock types and faulting. The change in pressure and temperature leads to the change in stress. The resulted strain changes the porosity, permeability and the consequently the new pressure distribution will be obtained. Due to this change the stress state should be updated by coupling studies. There are some methods to investigate the effects of geomechanics on reservoir simulation, as implicit, explicit, iterative and psudo-coupling method. Many researchers have tried to model the stress in the reservoir for more than thirty years. They have governed various equations to investigate the flow, thermal and chemical effect in stress redistribution. They have done their studied for many different conditions in different flow phases. However, there are lots of reservoir studies that did not consider geomechanics.