TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractModern reservoir characterization-simulation studies integrate geology, seismic, petrophysics and engineering to build threedimensional (3D) static geologic and dynamic fluid flow models. These models have repeatedly proven their worth through reduced risk and improved reservoir management decisions. Prior to the advent of modern computers and software, traditional reservoir engineering techniques served the industry well through analytic and graphical analysis techniques. It would seem that the modern characterization tools would make these traditional reservoir engineering techniques obsolete; however, this paper shows that integrating these traditional techniques can improve the quality of modern 3D models. This paper describes a field example where traditional reservoir engineering techniques from 40 years of waterflooding history were integrated into the modern reservoir characterization-simulation workflow.