Process for obtaining a "diesel cut" fuel by the oligomerization of olefins or their mixtures

Process for obtaining a "diesel cut" fuel having a CN cetane number equal to or greater than 48 and a content of aromatics lower than 0.4% by weight starting from olefins or their mixtures, characterized in that it comprises oligomerizing said olefins having from 2 to 10 carbon, distilling the stream obtained from the oligomerization, and hydrogenating the separated C₁₂-C₂₄ hydrocarbon stream.