Wavefield separation in the presence of statics: application to synthetic and real data

Saul E. Guevara and Peter W. Cary

ABSTRACT

An algorithm for wave mode separation at a free surface, including the effect of statics, is applied to synthetic and real land data. The algorithm is based on the free surface response for vertical and horizontal geophones, which are expressed as a function of the horizontal slowness, p , and then are applied in the ω-p domain. Statics are introduced as a phase rotation in the frequency domain, and the data are inverted using a standard linear method, to obtain the P- and S- wave fields below the near-surface layer. Application to synthetic data confirms that the algorithm works well, but with some sensitivity to the near-surface velocity model. With real data there is no clear difference in prestack data, however there is some improvement of poststack data.

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