Dispersive X-ray diffraction is an elemental analysis technique coupled with the scanning electron microscope this technique was used in this work to analyze the different layers of the Tarfaya deposit. The elements that can be monitored are, in order, sulphur, calcium, aluminum, potassium, chlorine, magnesium and iron.The reaction adopted is hydrogenation hydrogen is used in order to treat the shale with materials to remove corrosive elements such as sulphur (HDS Hydrodesulphurization at 550°C) as well as to improve the quality and quantity of the product of extractions either in the form of oil or gas, so we have used hydrogen. The HDS done in this study at the hydrogen pressure of one atmosphere in order to know the oil shale layers where this reaction is enhanced. The effect of hydrogen on oil shale differs according to their variety. Authors (M.Enomoto et al: 1985) have carried out a series of experiments on Colorado and Thai shale to study the effects of different operations on the yield and performance of the process at high hydrogen pressures. The lightest oils are obtained from oil shale whose yield is insensitive to hydrogen pressure.