The volume of shale (Vsh) is a critical parameter in petrophysical analysis that enables the accurate estimation other parameters like effective porosity, saturation and Net-to-Gross. This an important step characterization reservoirs as well valuation hydrocarbon potentials. GR (Gamma Ray), Neutron Density Potassium, Uranium Thorium logs were adopted to estimate analyze Vsh for sand 4 reservoi...