Abstract: The authors elaborate a noise elimination technique for prestack high energy coherent noise, such as multiplerefractions, sound waves, and surface waves. It combines the apparent velocity wave field transform technique, nonlinear filtering and the singular value decompose (SVD) filtering. Apparent velocity based wave field transform produces the transformed wave field. Filtering is then applied. The noise eliminated prestack data are obtained by performing the inverse wave field transform on the filtered channel set. More attention is paid to the nonlinear filtering technique. A detailed description on the principle, procedure, application and validation of the coherent noise elimination technique is provided.

Key words: prestack noises elimination, wave field transform, apparent velocity, nonlinearity filter