Abstract:A channel sand body can be considered as a thin bed when it's thickness is compared with seismic wave Iength.So it is often difficult to identify the reflections from the channel sand body on conventional seismic sections.But processed with certain special methods. the reflections from the channel sand body may be distingushed under particular geologic and geophysical conditions.The Chunhua channel sand body mentioned in this paper was discovered by using seismic method.