Abstract

An acquisition footprint is generally attributed as any undesired amplitude and or phase deviation, observed in seismic data caused by surface data-acquisition geometry/patterns rather than subsurface geology. These patterns (foot prints) tend to follow the acquisition geometry used for acquiring the seismic survey. These are usually seen on shallow time slices or horizon amplitude maps in most of the 3D volumes and are nuisance for the interpreter. These acquisition footprints may be generated due to various reasons. Efforts are made to prevent accentuation of the footprint during processing. Despite compensation to irregular fold and offset distribution during processing, these foot prints are still observed, sometimes at deeper level as well. The acquisition foot prints can be removed during post stack conditioning, by enhancement of signal at time slice level for each sample and rebuilding of seismic volume in inline or x-line mode before undertaking meaningful interpretation. In this work, the probable causes and the remedial measures to control the footprints are being discussed by taking an example from Indian offshore Basin.