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The conventional approach for estimating in situ porosity is the ombined use of bulk density and neutron porosity logs. Borehole uclear measurements are influenced by fundamental petrophysical nd geometrical properties such as saturating fluids, matrix compo-ition, mud-filtrate invasion, and shoulder beds Ellis and Singer, 007. Interpretation methods that include numerical modeling of-Afast numerical method is also essential to simulate nuclear bore-hole measurements in conjunction with inversion techniques as well as for their quantitative integration with other borehole measure-ments. This approach is not common practice, mainly because of the associated high computational requirements.Although recent devel-opments promote reductions in computational time with determinis-As a result of its high numerical accuracy and versatility to in-clude complex tool configurations and arbitrary spatial distribu