Directional filtering and side-swipe imaging

Ye Zheng and Robert R. Stewart

ABSTRACT

On seismic recordings, there may be some events from off-line reflectors (side-swipe). We could take advantage of these off-line energy to get a partial 3-D image from a 2-D line with 3 component seismic data. In this paper, a method of directional filtering and side-swipe imaging is presented. The least-squares method on time domain is used to determine the polarization degree and direction of the seismic signal. For P wave, the wave traveling direction is the same as the polarization direction. For S wave, the traveling direction is perpendicular to the polarization direction. This method is successfully applied to numerical models to separate in-line and off-line energy. After applying this method, we could get a better in-line imaging than that from conventional processing and could get a off-line image.

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