ABSTRACT
There are various forms of marine gas, they may be generated by ocean waves, fish’s swim bladder, submarine wake, shallow gas leak, hydrate decomposition, and so forth, they have a wide range of effects on sound signal used in marine seismic exploration, such as changing the speed of sound and attenuating signal energy. Various phenomena caused by natural gas have been found in the sea shallow gas and gas hydrates area, for example, speckled reflection “flame-” shaped reflection, and so forth. These phenomena do not exist in an area without shallow gas and gas hydrates.
