In the context of this work, it was determine the best region to invest, It is in the north of the valley Zkarh around the wells 7, 8 and 13, where the thickness of the clay level is large and thickness of sedimentary cover overlying is few. The results of the chemical analysis of clay samples in the studied area, the abundance of oxides of silicon and aluminum oxides in the mineral composition of clays Which refers to the composition of argillaceous minerals component mainly of Ilites in the most area and of montmorillonite in the center of the area near the wells 15, 16 and 17 sites. The clay was deposited in the study region from erosion of varying composition rocks, as weathering of Lower Eocene chalky rocks containing a cherty levels and weathering Cretaceous and Paleogene carbonate deployed in the north of the Zkarh valley. The chemical composition of clay of Zkarh Valley is typical for use in the ceramic industry.