Introduction: Importance of different forms of energy, renewable, non-renewable, efficiencies of all energies.- Oil & Gas scenario.- Alternatives. Heavy Oil. Coal Bed Methane. Hydrogen. Hydrates. Others.- Gas hydrates. What are gas hydrates. Structure. Shape and forms.- Stability conditions. Availability of methane. Pressure and Temperature conditions. Water chemistry. Higher hydrocarbons.- Geological indicators. Geophysical surveys. Geophysical processing. Geophysical indicators. Bottom Simulating Reflectors. Top of the hydrates (Gradational boundary). Attenuation. Shear waves (P-S conversion). Velocity.- Quantification of gas hydrates. Seismic Attributes. Reflection coefficient. Blanking. Velocity. Amplitude versus Offset. Modelling. Inversion. Rock Physics.- The Road Ahead.- Organization of the book