Abstarct: One of the issues considered in pre-production studies in oil reservoirs and significant concerns during production is the settlement of the soil around the reservoir. An increase in reservoir production on different sites leads to different trends in settlement values. On the other hand, the amount of injection into the reservoir also affects the production of the reservoir, and it changes the reservoir subsidence process. In this study, the injection process and its equivalent subsidence in the Last Hills reservoir were first discussed and using the new equation presented with CRM ; the maroon reservoir was simulated considering the injection effect. This study showed that using a nonlinear simulation of pore fluid pressure would increase the results' accuracy. Also, the maroon reservoir subsidence has reached a maximum of 7 cm after 19 years of fluid injection and production from the reservoir, with up to 3 cm settlement reduction in the early years of injection.