At present, the methods of resistivity sounding (both 1-D and 2-D) have been applied broadly in order to divide the electrical resistivity of different soil layers. The 2-D method with higher resolution has been showing its capacity of dividing soil layers with little differentiation in resistivity, such as in sections of sand and clay layers containing salted water. This article presents the results of applying a 2-D electrical sounding method (called also as electrical tomography) for establishing geoelectrical sections in the Phuoc Loc Village, Long Hoa Commune, Can Gio district, Ho Chi Minh city, that show the advantage of the 2-D electrical method over the traditional 1-D one in the determination of boundaries between soil layers having weakly differentiated resistivity. Besides, these results show also the potential capacity of resistivity sounding methods in geological studies.