In the master’s dissertation on petroleum engineering, we argue that the daily needs of the mankind to hydrocarbon resources are increasing constantly on a day to day basis. It is said in the dissertation that In order to supply the required energy and also reducing producible reserves, use of the enhanced recovery methods with the purpose of increasing the producible resources is inevitable. Based on the master’s dissertation on petroleum engineering, research regarding enhanced recovery methods, type and method of injecting the suitable fluid with the aim of increasing productivity of the oil reserves are of significant importance. One of the novel methods of enhanced recovery that is discussed in the dissertation is injection of low-salinity water that is performed for optimization and controlling ions concentration and also determination of the optimum level of the injected water’s salinity in order to enhance the recovery level of oil. It is said in the dissertation that advantages of using dilute water compared to the salty water as a enhanced recovery fluid include: ability to achieve higher recovery level, lower ratio of the water cutting, usability in carbonate resources, determination of wettability of the carbonate rock to hydrophilic and also reducing saturation level of the residual oil

In this dissertation, normally, different states of injecting dilute and salty water are simulated and compared. Simulation is performed using ECLIPSE 100 simulator. Another issue examined in the dissertation is effect of the injected water salinity. Based on the simulation results of the dissertation, it is shown that dilute water injection results in higher recovery level than using salty water and among studied parameters, water salinity level is the most significant