Abstract

After thorough exploration of Eocene and shallower prospects in Western Onland Basin, the focus has shifted to deeper prospects. The available seismic data is reprocessed with the deeper objectives. But, the presence of strong, linear events below 2000 mS in the sections of Western Onland basin was not correlatable to any geological feature. This event was seen on the post stack migrated sections also. Even the pre stack time or depth migration could not eliminate the effect of this event. Careful analysis of the raw shot gathers revealed the presence of high velocity noise. A dip filter was designed to precisely suppress the noise in the pre stack data. This filtered data when subjected to pre stack time migration, the resulting subsurface imaging was free from noise seen earlier and the processed data was interpretable