Deeply buried gas reservoirs along the Gulf of Mexico shelf are an important future energy resource for the U.S. One of the greatest problems encountered by operators in this area is identifying commercially viable targets for drilling. Because of the great depth of the reservoirs (over 15,000 ft), the most common 3D seismic methods for direct hydrocarbon indication, such as AVO (amplitude versus offset), are not reliable. Many wells have been drilled on deep AVO anomalies, only to find that they contain noncommercial quantities of gas (the so called “fizzwater” problem). Other problems in detecting deep gas formations are caused by inadequate offset in the seismic data acquisition and by high fluid pressures, which tend to make gas look more like water in a seismic sense.