OPEC noted that the United States productivity of shale oil could see a decline by the end of this year, while keeping them on the global demand for oil rates unchanged, and that according to the monthly report of the organization, and oil prices have seen a decline in the beginning of the week to reach the level to $ 42.39 a barrel in light of the ongoing between Iran and Western powers nuclear talks, but quickly saw great prices rebound after Fed statement to reach the highest level throughout the week at $ 46.25 a barrel. With a high oil price forecast to $ 70 a barrel by the end of the year.