The price of oil falls to the lows of March of this year, the reason; excess supply. It seems hard to believe, but it is true, an excess supply of crude oil has caused a barrel of Brent to fall below 45 dollars, something that does not happen very often.
According to Goldman Sachs, an investment banking group, supply and demand will not be equalized until the beginning of 2016, since barrels are sold at a price set in advance, therefore, as bloomberg, the prices for September, for example, would already be set.