Our several lines of research are beginning to converge for our Seismic Hydrocarbon Evaluation of Deep-Water Reservoir studies. After considerable effort, seismic data, logs, and core data sets have been obtained for several offshore areas. We are examining several aspects of hydrocarbon assessment including complex layering, fluid properties, attenuation and frequency content. For example, one interesting area has a stack of both productive and uneconomic zones. Seismic data correctly identifies productive reservoirs, but fails to differentiate the uneconomic zones. Fluid properties calculated for realistic conditions show that simple small gas saturations or ?Fizz Gas? cannot be responsible for these false indications.