Abstract：Acquisition footprints are inherent attributes of seismic exploration， causing illusion to seismic data interpretation. They can be suppressed by optimizing field acquisition parameters or geometry， but the cost is often too high. Since the indoor post-stack methods to suppress acquisition footprints blur the geometry factor due to stacking， the signal fidelity is low. Thus， this paper proposes a technical scheme for acquisition footprint suppression based on time slice coherent enhancement of OVT gathers. The pre-stack 5D data regularization and OVT pre-stack time migration （PSTM） are conducted successively. Then azimuth anisotropic time difference based on the OVT snail gather of PSTM is corrected to eliminate its effect. Meanwhile， the snail gathers are sorted into a single OVT gather which has only one fold and then the time slice is cut according to the sampling time for suppressing acquisition footprints by time slice coherent enhancement. Finally， the data after suppressing the footprints is reversely sorted back to the snail gathers. Actual data application shows that the characteristics of acquisition footprints on time slice with one fold are more obvious than those on the time migration profile， with stronger regularity. Compared with the commonly used methods of wave limiting in the post-stack frequency-wave number domain， the proposed method can maintain the relationship among channels of seismic signal amplitude and yields notable results in acquisition footprint suppression of OBC data collected in a shallow sea.
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