Reservoir engineering is a branch of petroleum engineering that focuses on the study of subsurface reservoirs to optimize the recovery of oil and gas. This field involves the use of mathematical models and simulations to analyze the behavior of reservoirs, determine the best extraction methods, and predict future production rates. Reservoir engineers work to maximize the efficiency of oil and gas recovery while minimizing costs and environmental impacts. They also play a key role in reservoir management, including monitoring production, implementing enhanced oil recovery techniques, and ensuring compliance with regulatory standards. Overall, reservoir engineering is essential for the successful exploitation of oil and gas reserves.